xref: /btstack/src/hci.c (revision fe6fb8a2a85b6f18ce013e04580e9909194bffdf)
1 /*
2  * Copyright (C) 2014 BlueKitchen GmbH
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  *
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the copyright holders nor the names of
14  *    contributors may be used to endorse or promote products derived
15  *    from this software without specific prior written permission.
16  * 4. Any redistribution, use, or modification is done solely for
17  *    personal benefit and not for any commercial purpose or for
18  *    monetary gain.
19  *
20  * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
24  * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
27  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
30  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  * Please inquire about commercial licensing options at
34  * [email protected]
35  *
36  */
37 
38 #define BTSTACK_FILE__ "hci.c"
39 
40 /*
41  *  hci.c
42  *
43  *  Created by Matthias Ringwald on 4/29/09.
44  *
45  */
46 
47 #include "btstack_config.h"
48 
49 
50 #ifdef ENABLE_CLASSIC
51 #ifdef HAVE_EMBEDDED_TICK
52 #include "btstack_run_loop_embedded.h"
53 #endif
54 #endif
55 
56 #ifdef ENABLE_BLE
57 #include "gap.h"
58 #include "ble/le_device_db.h"
59 #endif
60 
61 #include <stdarg.h>
62 #include <string.h>
63 #include <inttypes.h>
64 
65 #include "btstack_debug.h"
66 #include "btstack_event.h"
67 #include "btstack_linked_list.h"
68 #include "btstack_memory.h"
69 #include "bluetooth_company_id.h"
70 #include "bluetooth_data_types.h"
71 #include "gap.h"
72 #include "hci.h"
73 #include "hci_cmd.h"
74 #include "hci_dump.h"
75 #include "ad_parser.h"
76 
77 #ifdef ENABLE_CONTROLLER_DUMP_PACKETS
78 #include <stdio.h>  // sprintf
79 #endif
80 
81 #ifdef ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL
82 #ifndef HCI_HOST_ACL_PACKET_NUM
83 #error "ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL requires to define HCI_HOST_ACL_PACKET_NUM"
84 #endif
85 #ifndef HCI_HOST_ACL_PACKET_LEN
86 #error "ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL requires to define HCI_HOST_ACL_PACKET_LEN"
87 #endif
88 #ifndef HCI_HOST_SCO_PACKET_NUM
89 #error "ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL requires to define HCI_HOST_SCO_PACKET_NUM"
90 #endif
91 #ifndef HCI_HOST_SCO_PACKET_LEN
92 #error "ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL requires to define HCI_HOST_SCO_PACKET_LEN"
93 #endif
94 #endif
95 
96 #ifndef MAX_NR_CONTROLLER_ACL_BUFFERS
97 #define MAX_NR_CONTROLLER_ACL_BUFFERS 255
98 #endif
99 #ifndef MAX_NR_CONTROLLER_SCO_PACKETS
100 #define MAX_NR_CONTROLLER_SCO_PACKETS 255
101 #endif
102 
103 #ifndef HCI_ACL_CHUNK_SIZE_ALIGNMENT
104 #define HCI_ACL_CHUNK_SIZE_ALIGNMENT 1
105 #endif
106 
107 #if defined(ENABLE_SCO_OVER_HCI) && defined(ENABLE_SCO_OVER_PCM)
108 #error "SCO data can either be routed over HCI or over PCM, but not over both. Please only enable ENABLE_SCO_OVER_HCI or ENABLE_SCO_OVER_PCM."
109 #endif
110 
111 #if defined(ENABLE_SCO_OVER_HCI) && defined(HAVE_SCO_TRANSPORT)
112 #error "SCO data can either be routed over HCI or over PCM, but not over both. Please only enable ENABLE_SCO_OVER_HCI or HAVE_SCO_TRANSPORT."
113 #endif
114 
115 #define HCI_CONNECTION_TIMEOUT_MS 10000
116 
117 #ifndef HCI_RESET_RESEND_TIMEOUT_MS
118 #define HCI_RESET_RESEND_TIMEOUT_MS 200
119 #endif
120 
121 // Names are arbitrarily shortened to 32 bytes if not requested otherwise
122 #ifndef GAP_INQUIRY_MAX_NAME_LEN
123 #define GAP_INQUIRY_MAX_NAME_LEN 32
124 #endif
125 
126 // GAP inquiry state: 0 = off, 0x01 - 0x30 = requested duration, 0xfe = active, 0xff = stop requested
127 #define GAP_INQUIRY_DURATION_MIN       0x01
128 #define GAP_INQUIRY_DURATION_MAX       0x30
129 #define GAP_INQUIRY_MIN_PERIODIC_LEN_MIN 0x02
130 #define GAP_INQUIRY_MAX_PERIODIC_LEN_MIN 0x03
131 #define GAP_INQUIRY_STATE_IDLE         0x00
132 #define GAP_INQUIRY_STATE_W4_ACTIVE    0x80
133 #define GAP_INQUIRY_STATE_ACTIVE       0x81
134 #define GAP_INQUIRY_STATE_W2_CANCEL    0x82
135 #define GAP_INQUIRY_STATE_W4_CANCELLED 0x83
136 #define GAP_INQUIRY_STATE_PERIODIC     0x84
137 #define GAP_INQUIRY_STATE_W2_EXIT_PERIODIC 0x85
138 
139 // GAP Remote Name Request
140 #define GAP_REMOTE_NAME_STATE_IDLE 0
141 #define GAP_REMOTE_NAME_STATE_W2_SEND 1
142 #define GAP_REMOTE_NAME_STATE_W4_COMPLETE 2
143 
144 // GAP Pairing
145 #define GAP_PAIRING_STATE_IDLE                       0
146 #define GAP_PAIRING_STATE_SEND_PIN                   1
147 #define GAP_PAIRING_STATE_SEND_PIN_NEGATIVE          2
148 #define GAP_PAIRING_STATE_SEND_PASSKEY               3
149 #define GAP_PAIRING_STATE_SEND_PASSKEY_NEGATIVE      4
150 #define GAP_PAIRING_STATE_SEND_CONFIRMATION          5
151 #define GAP_PAIRING_STATE_SEND_CONFIRMATION_NEGATIVE 6
152 #define GAP_PAIRING_STATE_WAIT_FOR_COMMAND_COMPLETE  7
153 
154 //
155 // compact storage of relevant supported HCI Commands.
156 // X-Macro below provides enumeration and mapping table into the supported
157 // commands bitmap (64 bytes) from HCI Read Local Supported Commands
158 //
159 
160 // format: command name, byte offset, bit nr in 64-byte supported commands
161 // currently stored in 32-bit variable
162 #define SUPPORTED_HCI_COMMANDS \
163     X( SUPPORTED_HCI_COMMAND_READ_REMOTE_EXTENDED_FEATURES         ,  2, 6) \
164     X( SUPPORTED_HCI_COMMAND_WRITE_SYNCHRONOUS_FLOW_CONTROL_ENABLE , 10, 4) \
165     X( SUPPORTED_HCI_COMMAND_READ_BUFFER_SIZE                      , 14, 7) \
166     X( SUPPORTED_HCI_COMMAND_WRITE_DEFAULT_ERRONEOUS_DATA_REPORTING, 18, 3) \
167     X( SUPPORTED_HCI_COMMAND_READ_ENCRYPTION_KEY_SIZE              , 20, 4) \
168     X( SUPPORTED_HCI_COMMAND_SET_EVENT_MASK_PAGE_2                 , 22, 2) \
169     X( SUPPORTED_HCI_COMMAND_WRITE_LE_HOST_SUPPORTED               , 24, 6) \
170     X( SUPPORTED_HCI_COMMAND_LE_READ_REMOTE_FEATURES               , 27, 5) \
171     X( SUPPORTED_HCI_COMMAND_REMOTE_OOB_EXTENDED_DATA_REQUEST_REPLY, 32, 1) \
172     X( SUPPORTED_HCI_COMMAND_WRITE_SECURE_CONNECTIONS_HOST         , 32, 3) \
173     X( SUPPORTED_HCI_COMMAND_READ_LOCAL_OOB_EXTENDED_DATA_COMMAND  , 32, 6) \
174     X( SUPPORTED_HCI_COMMAND_LE_WRITE_SUGGESTED_DEFAULT_DATA_LENGTH, 34, 0) \
175     X( SUPPORTED_HCI_COMMAND_LE_SET_ADDRESS_RESOLUTION_ENABLE      , 35, 1) \
176     X( SUPPORTED_HCI_COMMAND_LE_READ_MAXIMUM_DATA_LENGTH           , 35, 3) \
177     X( SUPPORTED_HCI_COMMAND_LE_SET_DEFAULT_PHY                    , 35, 5) \
178     X( SUPPORTED_HCI_COMMAND_LE_SET_EXTENDED_ADVERTISING_ENABLE    , 36, 6) \
179     X( SUPPORTED_HCI_COMMAND_LE_READ_BUFFER_SIZE_V2                , 41, 5) \
180     X( SUPPORTED_HCI_COMMAND_SET_MIN_ENCRYPTION_KEY_SIZE           , 45, 7) \
181 
182 // enumerate supported commands
183 #define X(name, offset, bit) name,
184 enum {
185     SUPPORTED_HCI_COMMANDS
186     SUPPORTED_HCI_COMMANDS_COUNT
187 };
188 #undef X
189 
190 // prototypes
191 #ifdef ENABLE_CLASSIC
192 static void hci_update_scan_enable(void);
193 static void hci_emit_scan_mode_changed(uint8_t discoverable, uint8_t connectable);
194 static int  hci_local_ssp_activated(void);
195 static bool hci_remote_ssp_supported(hci_con_handle_t con_handle);
196 static bool hci_ssp_supported(hci_connection_t * connection);
197 static void hci_notify_if_sco_can_send_now(void);
198 static void hci_emit_connection_complete(bd_addr_t address, hci_con_handle_t con_handle, uint8_t status);
199 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection);
200 static void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level);
201 static void hci_connection_timeout_handler(btstack_timer_source_t *timer);
202 static void hci_connection_timestamp(hci_connection_t *connection);
203 static void hci_emit_l2cap_check_timeout(hci_connection_t *conn);
204 static void gap_inquiry_explode(uint8_t *packet, uint16_t size);
205 #endif
206 
207 static int  hci_power_control_on(void);
208 static void hci_power_control_off(void);
209 static void hci_state_reset(void);
210 static void hci_halting_timeout_handler(btstack_timer_source_t * ds);
211 static void hci_emit_transport_packet_sent(void);
212 static void hci_emit_disconnection_complete(hci_con_handle_t con_handle, uint8_t reason);
213 static void hci_emit_nr_connections_changed(void);
214 static void hci_emit_hci_open_failed(void);
215 static void hci_emit_dedicated_bonding_result(bd_addr_t address, uint8_t status);
216 static void hci_emit_event(uint8_t * event, uint16_t size, int dump);
217 static void hci_emit_btstack_event(uint8_t * event, uint16_t size, int dump);
218 static void hci_emit_acl_packet(uint8_t * packet, uint16_t size);
219 static void hci_run(void);
220 static bool hci_is_le_connection(hci_connection_t * connection);
221 static uint8_t hci_send_prepared_cmd_packet(void);
222 
223 #ifdef ENABLE_CLASSIC
224 static int hci_have_usb_transport(void);
225 static void hci_trigger_remote_features_for_connection(hci_connection_t * connection);
226 #endif
227 
228 #ifdef ENABLE_BLE
229 static bool hci_run_general_gap_le(void);
230 static void gap_privacy_clients_handle_ready(void);
231 static void gap_privacy_clients_notify(bd_addr_t new_random_address);
232 #ifdef ENABLE_LE_CENTRAL
233 // called from test/ble_client/advertising_data_parser.c
234 void le_handle_advertisement_report(uint8_t *packet, uint16_t size);
235 static uint8_t hci_whitelist_remove(bd_addr_type_t address_type, const bd_addr_t address);
236 static hci_connection_t * gap_get_outgoing_le_connection(void);
237 static void hci_le_scan_stop(void);
238 #endif
239 #ifdef ENABLE_LE_PERIPHERAL
240 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
241 static le_advertising_set_t * hci_advertising_set_for_handle(uint8_t advertising_handle);
242 static uint8_t hci_le_extended_advertising_operation_for_chunk(uint16_t pos, uint16_t len);
243 static void le_handle_extended_advertisement_report(uint8_t *packet, uint16_t size);
244 #endif /* ENABLE_LE_EXTENDED_ADVERTISING */
245 #endif /* ENABLE_LE_PERIPHERAL */
246 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
247 static hci_iso_stream_t * hci_iso_stream_create(hci_iso_type_t iso_type, hci_iso_stream_state_t state, uint8_t group_id, uint8_t stream_id);
248 static void hci_iso_stream_finalize(hci_iso_stream_t * iso_stream);
249 static void hci_iso_stream_finalize_by_type_and_group_id(hci_iso_type_t iso_type, uint8_t group_id);
250 static hci_iso_stream_t * hci_iso_stream_for_con_handle(hci_con_handle_t con_handle);
251 static void hci_iso_stream_requested_finalize(uint8_t big_handle);
252 static void hci_iso_stream_requested_confirm(uint8_t big_handle);
253 static void hci_iso_packet_handler(hci_iso_stream_t *iso_stream, uint8_t *packet, uint16_t size);
254 static le_audio_big_t * hci_big_for_handle(uint8_t big_handle);
255 static le_audio_cig_t * hci_cig_for_id(uint8_t cig_id);
256 static void hci_iso_notify_can_send_now(void);
257 static void hci_emit_big_created(const le_audio_big_t * big, uint8_t status);
258 static void hci_emit_big_terminated(const le_audio_big_t * big);
259 static void hci_emit_big_sync_created(const le_audio_big_sync_t * big_sync, uint8_t status);
260 static void hci_emit_big_sync_stopped(uint8_t big_handle);
261 static void hci_emit_cig_created(const le_audio_cig_t * cig, uint8_t status);
262 static void hci_cis_handle_created(hci_iso_stream_t * iso_stream, uint8_t status);
263 static le_audio_big_sync_t * hci_big_sync_for_handle(uint8_t big_handle);
264 #endif /* ENABLE_LE_ISOCHRONOUS_STREAMS */
265 #endif /* ENABLE_BLE */
266 
267 // the STACK is here
268 #ifndef HAVE_MALLOC
269 static hci_stack_t   hci_stack_static;
270 #endif
271 static hci_stack_t * hci_stack = NULL;
272 
273 #ifdef ENABLE_CLASSIC
274 // default name
275 static const char * default_classic_name = "BTstack 00:00:00:00:00:00";
276 
277 // test helper
278 static uint8_t disable_l2cap_timeouts = 0;
279 #endif
280 
281 // reset connection state on create and on reconnect
282 // don't overwrite addr, con handle, role
283 static void hci_connection_init(hci_connection_t * conn){
284     conn->authentication_flags = AUTH_FLAG_NONE;
285     conn->bonding_flags = 0;
286     conn->requested_security_level = LEVEL_0;
287     conn->link_key_type = INVALID_LINK_KEY;
288 #ifdef ENABLE_CLASSIC
289     conn->request_role = HCI_ROLE_INVALID;
290     conn->sniff_subrating_max_latency = 0xffff;
291     conn->qos_service_type = HCI_SERVICE_TYPE_INVALID;
292     btstack_run_loop_set_timer_handler(&conn->timeout, hci_connection_timeout_handler);
293     btstack_run_loop_set_timer_context(&conn->timeout, conn);
294     hci_connection_timestamp(conn);
295 #endif
296     conn->acl_recombination_length = 0;
297     conn->acl_recombination_pos = 0;
298     conn->num_packets_sent = 0;
299 
300     conn->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE;
301 #ifdef ENABLE_BLE
302     conn->le_phy_update_all_phys = 0xff;
303 #endif
304 #ifdef ENABLE_LE_LIMIT_ACL_FRAGMENT_BY_MAX_OCTETS
305     conn->le_max_tx_octets = 27;
306 #endif
307 #ifdef ENABLE_CLASSIC_PAIRING_OOB
308     conn->classic_oob_c_192 = NULL;
309     conn->classic_oob_r_192 = NULL;
310     conn->classic_oob_c_256 = NULL;
311     conn->classic_oob_r_256 = NULL;
312 #endif
313 #ifdef ENABLE_LE_PERIODIC_ADVERTISING
314     conn->le_past_sync_handle = HCI_CON_HANDLE_INVALID;
315     conn->le_past_advertising_handle = 0xff;
316 #endif
317 }
318 
319 /**
320  * create connection for given address
321  *
322  * @return connection OR NULL, if no memory left
323  */
324 static hci_connection_t *
325 create_connection_for_bd_addr_and_type(const bd_addr_t addr, bd_addr_type_t addr_type, hci_role_t role) {
326     log_info("create_connection_for_addr %s, type %x", bd_addr_to_str(addr), addr_type);
327 
328     hci_connection_t * conn = btstack_memory_hci_connection_get();
329     if (!conn) return NULL;
330     hci_connection_init(conn);
331 
332     bd_addr_copy(conn->address, addr);
333     conn->address_type = addr_type;
334     conn->con_handle = HCI_CON_HANDLE_INVALID;
335     conn->role = role;
336     btstack_linked_list_add(&hci_stack->connections, (btstack_linked_item_t *) conn);
337 
338     return conn;
339 }
340 
341 
342 /**
343  * get le connection parameter range
344 *
345  * @return le connection parameter range struct
346  */
347 void gap_get_connection_parameter_range(le_connection_parameter_range_t * range){
348     *range = hci_stack->le_connection_parameter_range;
349 }
350 
351 /**
352  * set le connection parameter range
353  *
354  */
355 
356 void gap_set_connection_parameter_range(le_connection_parameter_range_t *range){
357     hci_stack->le_connection_parameter_range = *range;
358 }
359 
360 /**
361  * @brief Test if connection parameters are inside in existing rage
362  * @param conn_interval_min (unit: 1.25ms)
363  * @param conn_interval_max (unit: 1.25ms)
364  * @param conn_latency
365  * @param supervision_timeout (unit: 10ms)
366  * @return 1 if included
367  */
368 int gap_connection_parameter_range_included(le_connection_parameter_range_t * existing_range, uint16_t le_conn_interval_min, uint16_t le_conn_interval_max, uint16_t le_conn_latency, uint16_t le_supervision_timeout){
369     if (le_conn_interval_min < existing_range->le_conn_interval_min) return 0;
370     if (le_conn_interval_max > existing_range->le_conn_interval_max) return 0;
371 
372     if (le_conn_latency < existing_range->le_conn_latency_min) return 0;
373     if (le_conn_latency > existing_range->le_conn_latency_max) return 0;
374 
375     if (le_supervision_timeout < existing_range->le_supervision_timeout_min) return 0;
376     if (le_supervision_timeout > existing_range->le_supervision_timeout_max) return 0;
377 
378     return 1;
379 }
380 
381 /**
382  * @brief Set max number of connections in LE Peripheral role (if Bluetooth Controller supports it)
383  * @note: default: 1
384  * @param max_peripheral_connections
385  */
386 #ifdef ENABLE_LE_PERIPHERAL
387 void gap_set_max_number_peripheral_connections(int max_peripheral_connections){
388     hci_stack->le_max_number_peripheral_connections = max_peripheral_connections;
389 }
390 #endif
391 
392 /**
393  * get hci connections iterator
394  *
395  * @return hci connections iterator
396  */
397 
398 void hci_connections_get_iterator(btstack_linked_list_iterator_t *it){
399     btstack_linked_list_iterator_init(it, &hci_stack->connections);
400 }
401 
402 /**
403  * get connection for a given handle
404  *
405  * @return connection OR NULL, if not found
406  */
407 hci_connection_t * hci_connection_for_handle(hci_con_handle_t con_handle){
408     btstack_linked_list_iterator_t it;
409     btstack_linked_list_iterator_init(&it, &hci_stack->connections);
410     while (btstack_linked_list_iterator_has_next(&it)){
411         hci_connection_t * item = (hci_connection_t *) btstack_linked_list_iterator_next(&it);
412         if ( item->con_handle == con_handle ) {
413             return item;
414         }
415     }
416     return NULL;
417 }
418 
419 /**
420  * get connection for given address
421  *
422  * @return connection OR NULL, if not found
423  */
424 hci_connection_t * hci_connection_for_bd_addr_and_type(const bd_addr_t  addr, bd_addr_type_t addr_type){
425     btstack_linked_list_iterator_t it;
426     btstack_linked_list_iterator_init(&it, &hci_stack->connections);
427     while (btstack_linked_list_iterator_has_next(&it)){
428         hci_connection_t * connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it);
429         if (connection->address_type != addr_type)  continue;
430         if (memcmp(addr, connection->address, 6) != 0) continue;
431         return connection;
432     }
433     return NULL;
434 }
435 
436 #ifdef ENABLE_CLASSIC
437 
438 inline static void connectionClearAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){
439     conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags & ~flags);
440 }
441 
442 inline static void connectionSetAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){
443     conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags | flags);
444 }
445 
446 #ifdef ENABLE_SCO_OVER_HCI
447 static int hci_number_sco_connections(void){
448     int connections = 0;
449     btstack_linked_list_iterator_t it;
450     btstack_linked_list_iterator_init(&it, &hci_stack->connections);
451     while (btstack_linked_list_iterator_has_next(&it)){
452         hci_connection_t * connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it);
453         if (connection->address_type != BD_ADDR_TYPE_SCO) continue;
454         connections++;
455     }
456     return connections;
457 }
458 #endif
459 
460 static void hci_connection_timeout_handler(btstack_timer_source_t *timer){
461     hci_connection_t * connection = (hci_connection_t *) btstack_run_loop_get_timer_context(timer);
462 #ifdef HAVE_EMBEDDED_TICK
463     if (btstack_run_loop_embedded_get_ticks() > connection->timestamp + btstack_run_loop_embedded_ticks_for_ms(HCI_CONNECTION_TIMEOUT_MS)){
464         // connections might be timed out
465         hci_emit_l2cap_check_timeout(connection);
466     }
467 #else
468     if (btstack_run_loop_get_time_ms() > (connection->timestamp + HCI_CONNECTION_TIMEOUT_MS)){
469         // connections might be timed out
470         hci_emit_l2cap_check_timeout(connection);
471     }
472 #endif
473 }
474 
475 static void hci_connection_timestamp(hci_connection_t *connection){
476 #ifdef HAVE_EMBEDDED_TICK
477     connection->timestamp = btstack_run_loop_embedded_get_ticks();
478 #else
479     connection->timestamp = btstack_run_loop_get_time_ms();
480 #endif
481 }
482 
483 /**
484  * add authentication flags and reset timer
485  * @note: assumes classic connection
486  * @note: bd_addr is passed in as little endian uint8_t * as it is called from parsing packets
487  */
488 static void hci_add_connection_flags_for_flipped_bd_addr(uint8_t *bd_addr, hci_authentication_flags_t flags){
489     bd_addr_t addr;
490     reverse_bd_addr(bd_addr, addr);
491     hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL);
492     if (conn) {
493         connectionSetAuthenticationFlags(conn, flags);
494         hci_connection_timestamp(conn);
495     }
496 }
497 
498 static bool hci_pairing_active(hci_connection_t * hci_connection){
499     return (hci_connection->authentication_flags & AUTH_FLAG_PAIRING_ACTIVE_MASK) != 0;
500 }
501 
502 static void hci_pairing_started(hci_connection_t * hci_connection, bool ssp){
503     if (hci_pairing_active(hci_connection)) return;
504     if (ssp){
505         hci_connection->authentication_flags |= AUTH_FLAG_SSP_PAIRING_ACTIVE;
506     } else {
507         hci_connection->authentication_flags |= AUTH_FLAG_LEGACY_PAIRING_ACTIVE;
508     }
509     // if we are initiator, we have sent an HCI Authenticate Request
510     bool initiator = (hci_connection->bonding_flags & BONDING_SENT_AUTHENTICATE_REQUEST) != 0;
511 
512     // if we are responder, use minimal service security level as required level
513     if (!initiator){
514         hci_connection->requested_security_level = (gap_security_level_t) btstack_max((uint32_t) hci_connection->requested_security_level, (uint32_t) hci_stack->gap_minimal_service_security_level);
515     }
516 
517     log_info("pairing started, ssp %u, initiator %u, requested level %u", (int) ssp, (int) initiator, hci_connection->requested_security_level);
518 
519     uint8_t event[12];
520     event[0] = GAP_EVENT_PAIRING_STARTED;
521     event[1] = 10;
522     little_endian_store_16(event, 2, (uint16_t) hci_connection->con_handle);
523     reverse_bd_addr(hci_connection->address, &event[4]);
524     event[10] = (uint8_t) ssp;
525     event[11] = (uint8_t) initiator;
526     hci_emit_btstack_event(event, sizeof(event), 1);
527 }
528 
529 static void hci_pairing_complete(hci_connection_t * hci_connection, uint8_t status){
530     hci_connection->requested_security_level = LEVEL_0;
531     if (!hci_pairing_active(hci_connection)) return;
532     hci_connection->authentication_flags &= ~AUTH_FLAG_PAIRING_ACTIVE_MASK;
533 #ifdef ENABLE_CLASSIC_PAIRING_OOB
534     hci_connection->classic_oob_c_192 = NULL;
535     hci_connection->classic_oob_r_192 = NULL;
536     hci_connection->classic_oob_c_256 = NULL;
537     hci_connection->classic_oob_r_256 = NULL;
538 #endif
539     log_info("pairing complete, status %02x", status);
540 
541     uint8_t event[11];
542     event[0] = GAP_EVENT_PAIRING_COMPLETE;
543     event[1] = 9;
544     little_endian_store_16(event, 2, (uint16_t) hci_connection->con_handle);
545     reverse_bd_addr(hci_connection->address, &event[4]);
546     event[10] = status;
547     hci_emit_btstack_event(event, sizeof(event), 1);
548 
549     // emit dedicated bonding done on failure, otherwise verify that connection can be encrypted
550     if ((status != ERROR_CODE_SUCCESS) && ((hci_connection->bonding_flags & BONDING_DEDICATED) != 0)){
551         hci_connection->bonding_flags &= ~BONDING_DEDICATED;
552         hci_connection->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE;
553         hci_connection->bonding_status = status;
554     }
555 }
556 
557 bool hci_authentication_active_for_handle(hci_con_handle_t handle){
558     hci_connection_t * conn = hci_connection_for_handle(handle);
559     if (!conn) return false;
560     return hci_pairing_active(conn);
561 }
562 
563 void gap_drop_link_key_for_bd_addr(bd_addr_t addr){
564     if (!hci_stack->link_key_db) return;
565     log_info("gap_drop_link_key_for_bd_addr: %s", bd_addr_to_str(addr));
566     hci_stack->link_key_db->delete_link_key(addr);
567 }
568 
569 void gap_store_link_key_for_bd_addr(bd_addr_t addr, link_key_t link_key, link_key_type_t type){
570     if (!hci_stack->link_key_db) return;
571     log_info("gap_store_link_key_for_bd_addr: %s, type %u", bd_addr_to_str(addr), type);
572     hci_stack->link_key_db->put_link_key(addr, link_key, type);
573 }
574 
575 bool gap_get_link_key_for_bd_addr(bd_addr_t addr, link_key_t link_key, link_key_type_t * type){
576 	if (!hci_stack->link_key_db) return false;
577 	int result = hci_stack->link_key_db->get_link_key(addr, link_key, type) != 0;
578 	log_info("link key for %s available %u, type %u", bd_addr_to_str(addr), result, (int) *type);
579 	return result;
580 }
581 
582 void gap_delete_all_link_keys(void){
583     bd_addr_t  addr;
584     link_key_t link_key;
585     link_key_type_t type;
586     btstack_link_key_iterator_t it;
587     int ok = gap_link_key_iterator_init(&it);
588     if (!ok) {
589         log_error("could not initialize iterator");
590         return;
591     }
592     while (gap_link_key_iterator_get_next(&it, addr, link_key, &type)){
593         gap_drop_link_key_for_bd_addr(addr);
594     }
595     gap_link_key_iterator_done(&it);
596 }
597 
598 int gap_link_key_iterator_init(btstack_link_key_iterator_t * it){
599     if (!hci_stack->link_key_db) return 0;
600     if (!hci_stack->link_key_db->iterator_init) return 0;
601     return hci_stack->link_key_db->iterator_init(it);
602 }
603 int gap_link_key_iterator_get_next(btstack_link_key_iterator_t * it, bd_addr_t bd_addr, link_key_t link_key, link_key_type_t * type){
604     if (!hci_stack->link_key_db) return 0;
605     return hci_stack->link_key_db->iterator_get_next(it, bd_addr, link_key, type);
606 }
607 void gap_link_key_iterator_done(btstack_link_key_iterator_t * it){
608     if (!hci_stack->link_key_db) return;
609     hci_stack->link_key_db->iterator_done(it);
610 }
611 #endif
612 
613 bool hci_is_le_connection_type(bd_addr_type_t address_type){
614     switch (address_type){
615         case BD_ADDR_TYPE_LE_PUBLIC:
616         case BD_ADDR_TYPE_LE_RANDOM:
617         case BD_ADDR_TYPE_LE_PUBLIC_IDENTITY:
618         case BD_ADDR_TYPE_LE_RANDOM_IDENTITY:
619             return true;
620         default:
621             return false;
622     }
623 }
624 
625 bool hci_is_le_identity_address_type(bd_addr_type_t address_type){
626     switch (address_type){
627         case BD_ADDR_TYPE_LE_PUBLIC_IDENTITY:
628         case BD_ADDR_TYPE_LE_RANDOM_IDENTITY:
629             return true;
630         default:
631             return false;
632     }
633 }
634 
635 static bool hci_is_le_connection(hci_connection_t * connection){
636     return hci_is_le_connection_type(connection->address_type);
637 }
638 
639 /**
640  * count connections
641  */
642 static int nr_hci_connections(void){
643     int count = 0;
644     btstack_linked_item_t *it;
645     for (it = (btstack_linked_item_t *) hci_stack->connections; it != NULL ; it = it->next){
646         count++;
647     }
648     return count;
649 }
650 
651 uint16_t hci_number_free_acl_slots_for_connection_type(bd_addr_type_t address_type){
652 
653     unsigned int num_packets_sent_classic = 0;
654     unsigned int num_packets_sent_le = 0;
655 
656     btstack_linked_item_t *it;
657     for (it = (btstack_linked_item_t *) hci_stack->connections; it != NULL; it = it->next){
658         hci_connection_t * connection = (hci_connection_t *) it;
659         if (hci_is_le_connection(connection)){
660             num_packets_sent_le += connection->num_packets_sent;
661         }
662         if (connection->address_type == BD_ADDR_TYPE_ACL){
663             num_packets_sent_classic += connection->num_packets_sent;
664         }
665     }
666     log_debug("ACL classic buffers: %u used of %u", num_packets_sent_classic, hci_stack->acl_packets_total_num);
667     int free_slots_classic = hci_stack->acl_packets_total_num - num_packets_sent_classic;
668     int free_slots_le = 0;
669 
670     if (free_slots_classic < 0){
671         log_error("hci_number_free_acl_slots: outgoing classic packets (%u) > total classic packets (%u)", num_packets_sent_classic, hci_stack->acl_packets_total_num);
672         return 0;
673     }
674 
675     if (hci_stack->le_acl_packets_total_num){
676         // if we have LE slots, they are used
677         free_slots_le = hci_stack->le_acl_packets_total_num - num_packets_sent_le;
678         if (free_slots_le < 0){
679             log_error("hci_number_free_acl_slots: outgoing le packets (%u) > total le packets (%u)", num_packets_sent_le, hci_stack->le_acl_packets_total_num);
680             return 0;
681         }
682     } else {
683         // otherwise, classic slots are used for LE, too
684         free_slots_classic -= num_packets_sent_le;
685         if (free_slots_classic < 0){
686             log_error("hci_number_free_acl_slots: outgoing classic + le packets (%u + %u) > total packets (%u)", num_packets_sent_classic, num_packets_sent_le, hci_stack->acl_packets_total_num);
687             return 0;
688         }
689     }
690 
691     switch (address_type){
692         case BD_ADDR_TYPE_UNKNOWN:
693             log_error("hci_number_free_acl_slots: unknown address type");
694             return 0;
695 
696         case BD_ADDR_TYPE_ACL:
697             return (uint16_t) free_slots_classic;
698 
699         default:
700            if (hci_stack->le_acl_packets_total_num > 0){
701                return (uint16_t) free_slots_le;
702            }
703            return (uint16_t) free_slots_classic;
704     }
705 }
706 
707 int hci_number_free_acl_slots_for_handle(hci_con_handle_t con_handle){
708     // get connection type
709     hci_connection_t * connection = hci_connection_for_handle(con_handle);
710     if (!connection){
711         log_error("hci_number_free_acl_slots: handle 0x%04x not in connection list", con_handle);
712         return 0;
713     }
714     return hci_number_free_acl_slots_for_connection_type(connection->address_type);
715 }
716 
717 #ifdef ENABLE_CLASSIC
718 static int hci_number_free_sco_slots(void){
719     unsigned int num_sco_packets_sent  = 0;
720     btstack_linked_item_t *it;
721     if (hci_stack->synchronous_flow_control_enabled){
722         // explicit flow control
723         for (it = (btstack_linked_item_t *) hci_stack->connections; it ; it = it->next){
724             hci_connection_t * connection = (hci_connection_t *) it;
725             if (connection->address_type != BD_ADDR_TYPE_SCO) continue;
726             num_sco_packets_sent += connection->num_packets_sent;
727         }
728         if (num_sco_packets_sent > hci_stack->sco_packets_total_num){
729             log_info("hci_number_free_sco_slots:packets (%u) > total packets (%u)", num_sco_packets_sent, hci_stack->sco_packets_total_num);
730             return 0;
731         }
732         return hci_stack->sco_packets_total_num - num_sco_packets_sent;
733     } else {
734         // implicit flow control
735         int num_ready = 0;
736         for (it = (btstack_linked_item_t *) hci_stack->connections; it ; it = it->next){
737             hci_connection_t * connection = (hci_connection_t *) it;
738             if (connection->address_type != BD_ADDR_TYPE_SCO) continue;
739             if (connection->sco_tx_ready == 0) continue;
740             num_ready++;
741         }
742         return num_ready;
743     }
744 }
745 #endif
746 
747 // only used to send HCI Host Number Completed Packets
748 static int hci_can_send_command_packet_transport(void){
749     if (hci_stack->hci_packet_buffer_reserved) return 0;
750 
751     // check for async hci transport implementations
752     if (hci_stack->hci_transport->can_send_packet_now){
753         if (!hci_stack->hci_transport->can_send_packet_now(HCI_COMMAND_DATA_PACKET)){
754             return 0;
755         }
756     }
757     return 1;
758 }
759 
760 // new functions replacing hci_can_send_packet_now[_using_packet_buffer]
761 bool hci_can_send_command_packet_now(void){
762     if (hci_can_send_command_packet_transport() == 0) return false;
763     return hci_stack->num_cmd_packets > 0u;
764 }
765 
766 static int hci_transport_can_send_prepared_packet_now(uint8_t packet_type){
767     // check for async hci transport implementations
768     if (!hci_stack->hci_transport->can_send_packet_now) return true;
769     return hci_stack->hci_transport->can_send_packet_now(packet_type);
770 }
771 
772 static bool hci_can_send_prepared_acl_packet_for_address_type(bd_addr_type_t address_type){
773     if (!hci_transport_can_send_prepared_packet_now(HCI_ACL_DATA_PACKET)) return false;
774     return hci_number_free_acl_slots_for_connection_type(address_type) > 0;
775 }
776 
777 bool hci_can_send_acl_le_packet_now(void){
778     if (hci_stack->hci_packet_buffer_reserved) return false;
779     return hci_can_send_prepared_acl_packet_for_address_type(BD_ADDR_TYPE_LE_PUBLIC);
780 }
781 
782 bool hci_can_send_prepared_acl_packet_now(hci_con_handle_t con_handle) {
783     if (!hci_transport_can_send_prepared_packet_now(HCI_ACL_DATA_PACKET)) return false;
784     return hci_number_free_acl_slots_for_handle(con_handle) > 0;
785 }
786 
787 bool hci_can_send_acl_packet_now(hci_con_handle_t con_handle){
788     if (hci_stack->hci_packet_buffer_reserved) return false;
789     return hci_can_send_prepared_acl_packet_now(con_handle);
790 }
791 
792 #ifdef ENABLE_CLASSIC
793 bool hci_can_send_acl_classic_packet_now(void){
794     if (hci_stack->hci_packet_buffer_reserved) return false;
795     return hci_can_send_prepared_acl_packet_for_address_type(BD_ADDR_TYPE_ACL);
796 }
797 
798 bool hci_can_send_prepared_sco_packet_now(void){
799     if (!hci_transport_can_send_prepared_packet_now(HCI_SCO_DATA_PACKET)) return false;
800     if (hci_have_usb_transport()){
801         return hci_stack->sco_can_send_now;
802     } else {
803         return hci_number_free_sco_slots() > 0;
804     }
805 }
806 
807 bool hci_can_send_sco_packet_now(void){
808     if (hci_stack->hci_packet_buffer_reserved) return false;
809     return hci_can_send_prepared_sco_packet_now();
810 }
811 
812 void hci_request_sco_can_send_now_event(void){
813     hci_stack->sco_waiting_for_can_send_now = 1;
814     hci_notify_if_sco_can_send_now();
815 }
816 #endif
817 
818 // used for internal checks in l2cap.c
819 bool hci_is_packet_buffer_reserved(void){
820     return hci_stack->hci_packet_buffer_reserved;
821 }
822 
823 void hci_reserve_packet_buffer(void){
824     btstack_assert(hci_stack->hci_packet_buffer_reserved == false);
825     hci_stack->hci_packet_buffer_reserved = true;
826 }
827 
828 void hci_release_packet_buffer(void){
829     btstack_assert(hci_stack->hci_packet_buffer_reserved);
830     hci_stack->hci_packet_buffer_reserved = false;
831     hci_emit_transport_packet_sent();
832 }
833 
834 // assumption: synchronous implementations don't provide can_send_packet_now as they don't keep the buffer after the call
835 static int hci_transport_synchronous(void){
836     return hci_stack->hci_transport->can_send_packet_now == NULL;
837 }
838 
839 // used for debugging
840 #ifdef ENABLE_CONTROLLER_DUMP_PACKETS
841 static void hci_controller_dump_packets(void){
842     // format: "{handle:04x}:{count:02d} "
843     char summaries[3][7 * 8 + 1];
844     uint16_t totals[3];
845     uint8_t index;
846     for (index = 0 ; index < 3 ; index++){
847         summaries[index][0] = 0;
848         totals[index] = 0;
849     }
850     btstack_linked_item_t *it;
851     for (it = (btstack_linked_item_t *) hci_stack->connections; it != NULL; it = it->next){
852         hci_connection_t * connection = (hci_connection_t *) it;
853         switch (connection->address_type){
854             case BD_ADDR_TYPE_ACL:
855                 index = 0;
856                 break;
857             case BD_ADDR_TYPE_SCO:
858                 index = 2;
859                 break;
860             default:
861                 index = 1;
862                 break;
863         }
864         totals[index] += connection->num_packets_sent;
865         char item_text[10];
866         sprintf(item_text, "%04x:%02d ", connection->con_handle,connection->num_packets_sent);
867         btstack_strcat(summaries[index], sizeof(summaries[0]), item_text);
868     }
869     for (index = 0 ; index < 3 ; index++){
870         if (summaries[index][0] == 0){
871             summaries[index][0] = '-';
872             summaries[index][1] = 0;
873         }
874     }
875     log_info("Controller ACL BR/EDR: %s total %u / LE: %s total %u / SCO: %s total %u", summaries[0], totals[0], summaries[1], totals[1], summaries[2], totals[2]);
876 }
877 #endif
878 
879 static uint8_t hci_send_acl_packet_fragments(hci_connection_t *connection){
880 
881     // log_info("hci_send_acl_packet_fragments  %u/%u (con 0x%04x)", hci_stack->acl_fragmentation_pos, hci_stack->acl_fragmentation_total_size, connection->con_handle);
882 
883     // max ACL data packet length depends on connection type (LE vs. Classic) and available buffers
884     uint16_t max_acl_data_packet_length = hci_stack->acl_data_packet_length;
885     if (hci_is_le_connection(connection) && (hci_stack->le_data_packets_length > 0u)){
886         max_acl_data_packet_length = hci_stack->le_data_packets_length;
887     }
888 
889 #ifdef ENABLE_LE_LIMIT_ACL_FRAGMENT_BY_MAX_OCTETS
890     if (hci_is_le_connection(connection) && (connection->le_max_tx_octets < max_acl_data_packet_length)){
891         max_acl_data_packet_length = connection->le_max_tx_octets;
892     }
893 #endif
894 
895     log_debug("hci_send_acl_packet_fragments entered");
896 
897     uint8_t status = ERROR_CODE_SUCCESS;
898     // multiple packets could be sent on a synchronous HCI transport
899     while (true){
900 
901         log_debug("hci_send_acl_packet_fragments loop entered");
902 
903         // get current data
904         const uint16_t acl_header_pos = hci_stack->acl_fragmentation_pos - 4u;
905         int current_acl_data_packet_length = hci_stack->acl_fragmentation_total_size - hci_stack->acl_fragmentation_pos;
906         bool more_fragments = false;
907 
908         // if ACL packet is larger than Bluetooth packet buffer, only send max_acl_data_packet_length
909         if (current_acl_data_packet_length > max_acl_data_packet_length){
910             more_fragments = true;
911             current_acl_data_packet_length = max_acl_data_packet_length & (~(HCI_ACL_CHUNK_SIZE_ALIGNMENT-1));
912         }
913 
914         // copy handle_and_flags if not first fragment and update packet boundary flags to be 01 (continuing fragment)
915         if (acl_header_pos > 0u){
916             uint16_t handle_and_flags = little_endian_read_16(hci_stack->hci_packet_buffer, 0);
917             handle_and_flags = (handle_and_flags & 0xcfffu) | (1u << 12u);
918             little_endian_store_16(hci_stack->hci_packet_buffer, acl_header_pos, handle_and_flags);
919         }
920 
921         // update header len
922         little_endian_store_16(hci_stack->hci_packet_buffer, acl_header_pos + 2u, current_acl_data_packet_length);
923 
924         // count packet
925         connection->num_packets_sent++;
926         log_debug("hci_send_acl_packet_fragments loop before send (more fragments %d)", (int) more_fragments);
927 
928         // update state for next fragment (if any) as "transport done" might be sent during send_packet already
929         if (more_fragments){
930             // update start of next fragment to send
931             hci_stack->acl_fragmentation_pos += current_acl_data_packet_length;
932         } else {
933             // done
934             hci_stack->acl_fragmentation_pos = 0;
935             hci_stack->acl_fragmentation_total_size = 0;
936         }
937 
938         // send packet
939         uint8_t * packet = &hci_stack->hci_packet_buffer[acl_header_pos];
940         const int size = current_acl_data_packet_length + 4;
941         hci_dump_packet(HCI_ACL_DATA_PACKET, 0, packet, size);
942         hci_stack->acl_fragmentation_tx_active = 1;
943         int err = hci_stack->hci_transport->send_packet(HCI_ACL_DATA_PACKET, packet, size);
944         if (err != 0){
945             // no error from HCI Transport expected
946             status = ERROR_CODE_HARDWARE_FAILURE;
947             break;
948         }
949 
950 #ifdef ENABLE_CONTROLLER_DUMP_PACKETS
951         hci_controller_dump_packets();
952 #endif
953 
954         log_debug("hci_send_acl_packet_fragments loop after send (more fragments %d)", (int) more_fragments);
955 
956         // done yet?
957         if (!more_fragments) break;
958 
959         // can send more?
960         if (!hci_can_send_prepared_acl_packet_now(connection->con_handle)) return status;
961     }
962 
963     log_debug("hci_send_acl_packet_fragments loop over");
964 
965     // release buffer now for synchronous transport
966     if (hci_transport_synchronous()){
967         hci_stack->acl_fragmentation_tx_active = 0;
968         hci_release_packet_buffer();
969     }
970 
971     return status;
972 }
973 
974 // pre: caller has reserved the packet buffer
975 uint8_t hci_send_acl_packet_buffer(int size){
976     btstack_assert(hci_stack->hci_packet_buffer_reserved);
977 
978     uint8_t * packet = hci_stack->hci_packet_buffer;
979     hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet);
980 
981     hci_connection_t *connection = hci_connection_for_handle( con_handle);
982     if (!connection) {
983         log_error("hci_send_acl_packet_buffer called but no connection for handle 0x%04x", con_handle);
984         hci_release_packet_buffer();
985         return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
986     }
987 
988     // check for free places on Bluetooth module
989     if (!hci_can_send_prepared_acl_packet_now(con_handle)) {
990         log_error("hci_send_acl_packet_buffer called but no free ACL buffers on controller");
991         hci_release_packet_buffer();
992         return BTSTACK_ACL_BUFFERS_FULL;
993     }
994 
995 #ifdef ENABLE_CLASSIC
996     hci_connection_timestamp(connection);
997 #endif
998 
999     // hci_dump_packet( HCI_ACL_DATA_PACKET, 0, packet, size);
1000 
1001     // setup data
1002     hci_stack->acl_fragmentation_total_size = size;
1003     hci_stack->acl_fragmentation_pos = 4;   // start of L2CAP packet
1004 
1005     return hci_send_acl_packet_fragments(connection);
1006 }
1007 
1008 #ifdef ENABLE_CLASSIC
1009 // pre: caller has reserved the packet buffer
1010 uint8_t hci_send_sco_packet_buffer(int size){
1011     btstack_assert(hci_stack->hci_packet_buffer_reserved);
1012 
1013     uint8_t * packet = hci_stack->hci_packet_buffer;
1014 
1015     // skip checks in loopback mode
1016     if (!hci_stack->loopback_mode){
1017         hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet);   // same for ACL and SCO
1018 
1019         // check for free places on Bluetooth module
1020         if (!hci_can_send_prepared_sco_packet_now()) {
1021             log_error("hci_send_sco_packet_buffer called but no free SCO buffers on controller");
1022             hci_release_packet_buffer();
1023             return BTSTACK_ACL_BUFFERS_FULL;
1024         }
1025 
1026         // track send packet in connection struct
1027         hci_connection_t *connection = hci_connection_for_handle( con_handle);
1028         if (!connection) {
1029             log_error("hci_send_sco_packet_buffer called but no connection for handle 0x%04x", con_handle);
1030             hci_release_packet_buffer();
1031             return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
1032         }
1033 
1034         if (hci_have_usb_transport()){
1035             // token used
1036             hci_stack->sco_can_send_now = false;
1037         } else {
1038             if (hci_stack->synchronous_flow_control_enabled){
1039                 connection->num_packets_sent++;
1040             } else {
1041                 connection->sco_tx_ready--;
1042             }
1043         }
1044     }
1045 
1046     hci_dump_packet( HCI_SCO_DATA_PACKET, 0, packet, size);
1047 
1048 #ifdef HAVE_SCO_TRANSPORT
1049     hci_stack->sco_transport->send_packet(packet, size);
1050     hci_release_packet_buffer();
1051     hci_emit_transport_packet_sent();
1052 
1053     return 0;
1054 #else
1055     int err = hci_stack->hci_transport->send_packet(HCI_SCO_DATA_PACKET, packet, size);
1056     uint8_t status;
1057     if (err == 0){
1058         status = ERROR_CODE_SUCCESS;
1059     } else {
1060         status = ERROR_CODE_HARDWARE_FAILURE;
1061     }
1062     if ((status != ERROR_CODE_SUCCESS) || hci_transport_synchronous()){
1063         hci_release_packet_buffer();
1064     }
1065     return status;
1066 #endif
1067 }
1068 #endif
1069 
1070 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
1071 static uint8_t hci_send_iso_packet_fragments(void){
1072 
1073     uint16_t max_iso_data_packet_length = hci_stack->le_iso_packets_length;
1074     uint8_t status = ERROR_CODE_SUCCESS;
1075     // multiple packets could be send on a synchronous HCI transport
1076     while (true){
1077 
1078         // get current data
1079         const uint16_t iso_header_pos = hci_stack->iso_fragmentation_pos - 4u;
1080         int current_iso_data_packet_length = hci_stack->iso_fragmentation_total_size - hci_stack->iso_fragmentation_pos;
1081         bool more_fragments = false;
1082 
1083         // if ISO packet is larger than Bluetooth packet buffer, only send max_acl_data_packet_length
1084         if (current_iso_data_packet_length > max_iso_data_packet_length){
1085             more_fragments = true;
1086             current_iso_data_packet_length = max_iso_data_packet_length;
1087         }
1088 
1089         // copy handle_and_flags if not first fragment and update packet boundary flags to be 01 (continuing fragmnent)
1090         uint16_t handle_and_flags = little_endian_read_16(hci_stack->hci_packet_buffer, 0);
1091         uint8_t pb_flags;
1092         if (iso_header_pos == 0u){
1093             // first fragment, keep TS field
1094             pb_flags = more_fragments ? 0x00 : 0x02;
1095             handle_and_flags = (handle_and_flags & 0x4fffu) | (pb_flags << 12u);
1096         } else {
1097             // later fragment, drop TS field
1098             pb_flags = more_fragments ? 0x01 : 0x03;
1099             handle_and_flags = (handle_and_flags & 0x0fffu) | (pb_flags << 12u);
1100         }
1101         little_endian_store_16(hci_stack->hci_packet_buffer, iso_header_pos, handle_and_flags);
1102 
1103         // update header len
1104         little_endian_store_16(hci_stack->hci_packet_buffer, iso_header_pos + 2u, current_iso_data_packet_length);
1105 
1106         // update state for next fragment (if any) as "transport done" might be sent during send_packet already
1107         if (more_fragments){
1108             // update start of next fragment to send
1109             hci_stack->iso_fragmentation_pos += current_iso_data_packet_length;
1110         } else {
1111             // done
1112             hci_stack->iso_fragmentation_pos = 0;
1113             hci_stack->iso_fragmentation_total_size = 0;
1114         }
1115 
1116         // send packet
1117         uint8_t * packet = &hci_stack->hci_packet_buffer[iso_header_pos];
1118         const int size = current_iso_data_packet_length + 4;
1119         hci_dump_packet(HCI_ISO_DATA_PACKET, 0, packet, size);
1120         hci_stack->iso_fragmentation_tx_active = true;
1121         int err = hci_stack->hci_transport->send_packet(HCI_ISO_DATA_PACKET, packet, size);
1122         if (err != 0){
1123             // no error from HCI Transport expected
1124             status = ERROR_CODE_HARDWARE_FAILURE;
1125         }
1126 
1127         // done yet?
1128         if (!more_fragments) break;
1129 
1130         // can send more?
1131         if (!hci_transport_can_send_prepared_packet_now(HCI_ISO_DATA_PACKET)) return false;
1132     }
1133 
1134     // release buffer now for synchronous transport
1135     if (hci_transport_synchronous()){
1136         hci_stack->iso_fragmentation_tx_active = false;
1137         hci_release_packet_buffer();
1138         hci_emit_transport_packet_sent();
1139     }
1140 
1141     return status;
1142 }
1143 
1144 uint8_t hci_send_iso_packet_buffer(uint16_t size){
1145     btstack_assert(hci_stack->hci_packet_buffer_reserved);
1146 
1147     hci_con_handle_t con_handle = (hci_con_handle_t) little_endian_read_16(hci_stack->hci_packet_buffer, 0) & 0xfff;
1148     hci_iso_stream_t * iso_stream = hci_iso_stream_for_con_handle(con_handle);
1149     if (iso_stream == NULL){
1150         hci_release_packet_buffer();
1151         hci_iso_notify_can_send_now();
1152         return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
1153     }
1154 
1155     // TODO: check for space on controller
1156 
1157     // skip iso packets if needed
1158     if (iso_stream->num_packets_to_skip > 0){
1159         iso_stream->num_packets_to_skip--;
1160         // pretend it was processed and trigger next one
1161         hci_release_packet_buffer();
1162         hci_iso_notify_can_send_now();
1163         return ERROR_CODE_SUCCESS;
1164     }
1165 
1166     // track outgoing packet sent
1167     log_info("Outgoing ISO packet for con handle 0x%04x", con_handle);
1168     iso_stream->num_packets_sent++;
1169 
1170     // setup data
1171     hci_stack->iso_fragmentation_total_size = size;
1172     hci_stack->iso_fragmentation_pos = 4;   // start of L2CAP packet
1173 
1174     return hci_send_iso_packet_fragments();
1175 }
1176 #endif
1177 
1178 static void acl_handler(uint8_t *packet, uint16_t size){
1179 
1180     // get info
1181     hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet);
1182     hci_connection_t *conn      = hci_connection_for_handle(con_handle);
1183     uint8_t  acl_flags          = READ_ACL_FLAGS(packet);
1184     uint16_t acl_length         = READ_ACL_LENGTH(packet);
1185 
1186     // ignore non-registered handle
1187     if (!conn){
1188         log_error("acl_handler called with non-registered handle %u!" , con_handle);
1189         return;
1190     }
1191 
1192     // assert packet is complete
1193     if ((acl_length + 4u) != size){
1194         log_error("acl_handler called with ACL packet of wrong size %d, expected %u => dropping packet", size, acl_length + 4);
1195         return;
1196     }
1197 
1198 #ifdef ENABLE_CLASSIC
1199     // update idle timestamp
1200     hci_connection_timestamp(conn);
1201 #endif
1202 
1203 #ifdef ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL
1204     hci_stack->host_completed_packets = 1;
1205     conn->num_packets_completed++;
1206 #endif
1207 
1208     // handle different packet types
1209     switch (acl_flags & 0x03u) {
1210 
1211         case 0x01: // continuation fragment
1212 
1213             // sanity checks
1214             if (conn->acl_recombination_pos == 0u) {
1215                 log_error( "ACL Cont Fragment but no first fragment for handle 0x%02x", con_handle);
1216                 return;
1217             }
1218             if ((conn->acl_recombination_pos + acl_length) > (4u + HCI_ACL_BUFFER_SIZE)){
1219                 log_error( "ACL Cont Fragment to large: combined packet %u > buffer size %u for handle 0x%02x",
1220                     conn->acl_recombination_pos + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle);
1221                 conn->acl_recombination_pos = 0;
1222                 return;
1223             }
1224 
1225             // append fragment payload (header already stored)
1226             (void)memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE + conn->acl_recombination_pos],
1227                          &packet[4], acl_length);
1228             conn->acl_recombination_pos += acl_length;
1229 
1230             // forward complete L2CAP packet if complete.
1231             if (conn->acl_recombination_pos >= (conn->acl_recombination_length + 4u + 4u)){ // pos already incl. ACL header
1232                 hci_emit_acl_packet(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], conn->acl_recombination_pos);
1233                 // reset recombination buffer
1234                 conn->acl_recombination_length = 0;
1235                 conn->acl_recombination_pos = 0;
1236             }
1237             break;
1238 
1239         case 0x02: { // first fragment
1240 
1241             // sanity check
1242             if (conn->acl_recombination_pos) {
1243                 // we just received the first fragment, but still have data. Only warn if the packet wasn't a flushable packet
1244                 if ((conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE+1] >> 4) != 0x02){
1245                     log_error( "ACL First Fragment but %u bytes in buffer for handle 0x%02x, dropping stale fragments", conn->acl_recombination_pos, con_handle);
1246                 }
1247                 conn->acl_recombination_pos = 0;
1248             }
1249 
1250             // peek into L2CAP packet!
1251             uint16_t l2cap_length = READ_L2CAP_LENGTH( packet );
1252 
1253             // compare fragment size to L2CAP packet size
1254             if (acl_length >= (l2cap_length + 4u)){
1255                 // forward fragment as L2CAP packet
1256                 hci_emit_acl_packet(packet, acl_length + 4u);
1257             } else {
1258 
1259                 if (acl_length > HCI_ACL_BUFFER_SIZE){
1260                     log_error( "ACL First Fragment to large: fragment %u > buffer size %u for handle 0x%02x",
1261                         4 + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle);
1262                     return;
1263                 }
1264 
1265                 // store first fragment and tweak acl length for complete package
1266                 (void)memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE],
1267                              packet, acl_length + 4u);
1268                 conn->acl_recombination_pos    = acl_length + 4u;
1269                 conn->acl_recombination_length = l2cap_length;
1270                 little_endian_store_16(conn->acl_recombination_buffer, HCI_INCOMING_PRE_BUFFER_SIZE + 2u, l2cap_length +4u);
1271             }
1272             break;
1273 
1274         }
1275         default:
1276             log_error( "acl_handler called with invalid packet boundary flags %u", acl_flags & 0x03);
1277             return;
1278     }
1279 
1280     // execute main loop
1281     hci_run();
1282 }
1283 
1284 static void hci_connection_stop_timer(hci_connection_t * conn){
1285     btstack_run_loop_remove_timer(&conn->timeout);
1286 #ifdef ENABLE_CLASSIC
1287     btstack_run_loop_remove_timer(&conn->timeout_sco);
1288 #endif
1289 }
1290 
1291 static void hci_shutdown_connection(hci_connection_t *conn){
1292     log_info("Connection closed: handle 0x%x, %s", conn->con_handle, bd_addr_to_str(conn->address));
1293 
1294 #ifdef ENABLE_CLASSIC
1295 #if defined(ENABLE_SCO_OVER_HCI) || defined(HAVE_SCO_TRANSPORT)
1296     bd_addr_type_t addr_type = conn->address_type;
1297 #endif
1298 #ifdef HAVE_SCO_TRANSPORT
1299     hci_con_handle_t con_handle = conn->con_handle;
1300 #endif
1301 #endif
1302 
1303     hci_connection_stop_timer(conn);
1304 
1305     btstack_linked_list_remove(&hci_stack->connections, (btstack_linked_item_t *) conn);
1306     btstack_memory_hci_connection_free( conn );
1307 
1308     // now it's gone
1309     hci_emit_nr_connections_changed();
1310 
1311 #ifdef ENABLE_CLASSIC
1312 #ifdef ENABLE_SCO_OVER_HCI
1313     // update SCO
1314     if ((addr_type == BD_ADDR_TYPE_SCO) && (hci_stack->hci_transport != NULL) && (hci_stack->hci_transport->set_sco_config != NULL)){
1315         hci_stack->hci_transport->set_sco_config(hci_stack->sco_voice_setting_active, hci_number_sco_connections());
1316     }
1317 #endif
1318 #ifdef HAVE_SCO_TRANSPORT
1319     if ((addr_type == BD_ADDR_TYPE_SCO) && (hci_stack->sco_transport != NULL)){
1320         hci_stack->sco_transport->close(con_handle);
1321     }
1322 #endif
1323 #endif
1324 }
1325 
1326 #ifdef ENABLE_CLASSIC
1327 
1328 static const uint16_t hci_acl_packet_type_sizes[] = {
1329     0, HCI_ACL_2DH1_SIZE, HCI_ACL_3DH1_SIZE, HCI_ACL_DM1_SIZE,
1330     HCI_ACL_DH1_SIZE, 0, 0, 0,
1331     HCI_ACL_2DH3_SIZE, HCI_ACL_3DH3_SIZE, HCI_ACL_DM3_SIZE, HCI_ACL_DH3_SIZE,
1332     HCI_ACL_2DH5_SIZE, HCI_ACL_3DH5_SIZE, HCI_ACL_DM5_SIZE, HCI_ACL_DH5_SIZE
1333 };
1334 static const uint8_t hci_acl_packet_type_feature_requirement_bit[] = {
1335      0, // 3 slot packets
1336      1, // 5 slot packets
1337     25, // EDR 2 mpbs
1338     26, // EDR 3 mbps
1339     39, // 3 slot EDR packtes
1340     40, // 5 slot EDR packet
1341 };
1342 static const uint16_t hci_acl_packet_type_feature_packet_mask[] = {
1343     0x0f00, // 3 slot packets
1344     0xf000, // 5 slot packets
1345     0x1102, // EDR 2 mpbs
1346     0x2204, // EDR 3 mbps
1347     0x0300, // 3 slot EDR packtes
1348     0x3000, // 5 slot EDR packet
1349 };
1350 
1351 static uint16_t hci_acl_packet_types_for_buffer_size_and_local_features(uint16_t buffer_size, uint8_t * local_supported_features){
1352     // enable packet types based on size
1353     uint16_t packet_types = 0;
1354     unsigned int i;
1355     for (i=0;i<16;i++){
1356         if (hci_acl_packet_type_sizes[i] == 0) continue;
1357         if (hci_acl_packet_type_sizes[i] <= buffer_size){
1358             packet_types |= 1 << i;
1359         }
1360     }
1361     // disable packet types due to missing local supported features
1362     for (i=0;i<sizeof(hci_acl_packet_type_feature_requirement_bit); i++){
1363         unsigned int bit_idx = hci_acl_packet_type_feature_requirement_bit[i];
1364         int feature_set = (local_supported_features[bit_idx >> 3] & (1<<(bit_idx & 7))) != 0;
1365         if (feature_set) continue;
1366         log_info("Features bit %02u is not set, removing packet types 0x%04x", bit_idx, hci_acl_packet_type_feature_packet_mask[i]);
1367         packet_types &= ~hci_acl_packet_type_feature_packet_mask[i];
1368     }
1369     return packet_types;
1370 }
1371 
1372 uint16_t hci_usable_acl_packet_types(void){
1373     uint16_t active_packet_types = (hci_stack->usable_packet_types_acl &  hci_stack->enabled_packet_types_acl);
1374     // flip bits for "may not be used"
1375     return  active_packet_types ^ 0x3306;
1376 }
1377 
1378 void hci_enable_acl_packet_types(uint16_t packet_types){
1379     hci_stack->enabled_packet_types_acl = packet_types;
1380 }
1381 
1382 static const struct {
1383     uint8_t feature_index;
1384     uint16_t feature_packet_mask;
1385 } hci_sco_packet_type_feature_requirements[] = {
1386         { 12, SCO_PACKET_TYPES_HV2 },                           // HV2 packets
1387         { 13, SCO_PACKET_TYPES_HV3 },                           // HV3 packets
1388         { 31, SCO_PACKET_TYPES_ESCO },                          // eSCO links (EV3 packets)
1389         { 32, SCO_PACKET_TYPES_EV4 },                           // EV4 packets
1390         { 45, SCO_PACKET_TYPES_2EV3 | SCO_PACKET_TYPES_2EV5 },  // EDR eSCO 2 Mb/s
1391         { 46, SCO_PACKET_TYPES_3EV3 | SCO_PACKET_TYPES_3EV5 },  // EDR eSCO 3 Mb/s
1392         { 47, SCO_PACKET_TYPES_2EV5 | SCO_PACKET_TYPES_3EV5 },  // 3-slot EDR eSCO packets, 2-EV3/3-EV3 use single slot
1393 };
1394 
1395 // map packet types to payload length, prefer eSCO over SCO and large over small packets
1396 static const struct {
1397     uint16_t type;
1398     uint16_t payload_length;
1399 } hci_sco_packet_type_to_payload_length[] = {
1400         {SCO_PACKET_TYPES_3EV5, HCI_SCO_3EV5_SIZE}, // 540
1401         {SCO_PACKET_TYPES_2EV5, HCI_SCO_2EV5_SIZE}, // 360
1402         {SCO_PACKET_TYPES_EV5,  HCI_SCO_EV5_SIZE},  // 180
1403         {SCO_PACKET_TYPES_EV4,  HCI_SCO_EV4_SIZE},  // 120
1404         {SCO_PACKET_TYPES_3EV3, HCI_SCO_3EV3_SIZE}, //  90
1405         {SCO_PACKET_TYPES_2EV3, HCI_SCO_2EV3_SIZE}, //  60
1406         {SCO_PACKET_TYPES_EV3,  HCI_SCO_EV3_SIZE},  //  30
1407         {SCO_PACKET_TYPES_HV3,  HCI_SCO_HV3_SIZE},  //  30
1408         {SCO_PACKET_TYPES_HV2,  HCI_SCO_HV2_SIZE},  //  20
1409         {SCO_PACKET_TYPES_HV1,  HCI_SCO_HV1_SIZE}   //  10
1410 };
1411 
1412 static uint16_t hci_sco_packet_types_for_features(const uint8_t * local_supported_features){
1413     uint16_t packet_types = SCO_PACKET_TYPES_ALL;
1414     unsigned int i;
1415     // disable packet types due to missing local supported features
1416     for (i=0;i<(sizeof(hci_sco_packet_type_feature_requirements)/sizeof(hci_sco_packet_type_feature_requirements[0])); i++){
1417         unsigned int bit_idx = hci_sco_packet_type_feature_requirements[i].feature_index;
1418         bool feature_set = (local_supported_features[bit_idx >> 3] & (1<<(bit_idx & 7))) != 0;
1419         if (feature_set) continue;
1420         log_info("Features bit %02u is not set, removing packet types 0x%04x", bit_idx, hci_sco_packet_type_feature_requirements[i].feature_packet_mask);
1421         packet_types &= ~hci_sco_packet_type_feature_requirements[i].feature_packet_mask;
1422     }
1423     return packet_types;
1424 }
1425 
1426 uint16_t hci_usable_sco_packet_types(void){
1427     return hci_stack->usable_packet_types_sco;
1428 }
1429 
1430 static uint16_t hci_sco_payload_length_for_packet_types(uint16_t packet_types){
1431     uint8_t i;
1432     for (i=0;i<sizeof(hci_sco_packet_type_to_payload_length)/sizeof(hci_sco_packet_type_to_payload_length[0]);i++){
1433         if ((hci_sco_packet_type_to_payload_length[i].type & packet_types) != 0){
1434             return hci_sco_packet_type_to_payload_length[i].payload_length;
1435         }
1436     }
1437     return 0;
1438 }
1439 
1440 #endif
1441 
1442 uint8_t* hci_get_outgoing_packet_buffer(void){
1443     // hci packet buffer is >= acl data packet length
1444     return hci_stack->hci_packet_buffer;
1445 }
1446 
1447 uint16_t hci_max_acl_data_packet_length(void){
1448     return hci_stack->acl_data_packet_length;
1449 }
1450 
1451 #ifdef ENABLE_CLASSIC
1452 bool hci_extended_sco_link_supported(void){
1453     // No. 31, byte 3, bit 7
1454     return (hci_stack->local_supported_features[3] & (1 << 7)) != 0;
1455 }
1456 #endif
1457 
1458 bool hci_non_flushable_packet_boundary_flag_supported(void){
1459     // No. 54, byte 6, bit 6
1460     return (hci_stack->local_supported_features[6u] & (1u << 6u)) != 0u;
1461 }
1462 
1463 #ifdef ENABLE_CLASSIC
1464 static bool gap_ssp_supported(void){
1465     // No. 51, byte 6, bit 3
1466     return (hci_stack->local_supported_features[6u] & (1u << 3u)) != 0u;
1467 }
1468 #endif
1469 
1470 bool hci_classic_supported(void){
1471 #ifdef ENABLE_CLASSIC
1472     // No. 37, byte 4, bit 5, = No BR/EDR Support
1473     return (hci_stack->local_supported_features[4] & (1 << 5)) == 0;
1474 #else
1475     return false;
1476 #endif
1477 }
1478 
1479 bool hci_le_supported(void){
1480 #ifdef ENABLE_BLE
1481     // No. 37, byte 4, bit 6 = LE Supported (Controller)
1482     return (hci_stack->local_supported_features[4u] & (1u << 6u)) != 0u;
1483 #else
1484     return false;
1485 #endif
1486 }
1487 
1488 static bool hci_command_supported(uint8_t command_index){
1489     return (hci_stack->local_supported_commands & (1LU << command_index)) != 0;
1490 }
1491 
1492 #ifdef ENABLE_BLE
1493 
1494 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
1495 bool hci_le_extended_advertising_supported(void){
1496     return hci_command_supported(SUPPORTED_HCI_COMMAND_LE_SET_EXTENDED_ADVERTISING_ENABLE);
1497 }
1498 #endif
1499 
1500 static void hci_get_own_address_for_addr_type(uint8_t own_addr_type, bd_addr_t own_addr){
1501     if (own_addr_type == BD_ADDR_TYPE_LE_PUBLIC){
1502         (void)memcpy(own_addr, hci_stack->local_bd_addr, 6);
1503     } else {
1504         (void)memcpy(own_addr, hci_stack->le_random_address, 6);
1505     }
1506 }
1507 
1508 void gap_le_get_own_address(uint8_t * addr_type, bd_addr_t addr){
1509     *addr_type = hci_stack->le_own_addr_type;
1510     hci_get_own_address_for_addr_type(hci_stack->le_own_addr_type, addr);
1511 }
1512 
1513 #ifdef ENABLE_LE_PERIPHERAL
1514 void gap_le_get_own_advertisements_address(uint8_t * addr_type, bd_addr_t addr){
1515     *addr_type = hci_stack->le_advertisements_own_addr_type;
1516     hci_get_own_address_for_addr_type(hci_stack->le_advertisements_own_addr_type, addr);
1517 };
1518 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
1519 void gap_le_get_own_advertising_set_address(uint8_t * addr_type, bd_addr_t addr, uint8_t advertising_handle){
1520     if (advertising_handle == 0){
1521         gap_le_get_own_advertisements_address(addr_type, addr);
1522     } else {
1523         le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(advertising_handle);
1524         if (advertising_set != NULL){
1525             switch (advertising_set->extended_params.own_address_type){
1526                 case BD_ADDR_TYPE_LE_PUBLIC:
1527                     *addr_type = BD_ADDR_TYPE_LE_PUBLIC;
1528                     memcpy(addr, hci_stack->local_bd_addr, 6);
1529                     break;
1530                 case BD_ADDR_TYPE_LE_RANDOM:
1531                     *addr_type = BD_ADDR_TYPE_LE_RANDOM;
1532                     memcpy(addr, advertising_set->random_address, 6);
1533                     break;
1534                 case BD_ADDR_TYPE_LE_PUBLIC_IDENTITY:
1535                 case BD_ADDR_TYPE_LE_RANDOM_IDENTITY:
1536                     // do nothing as random address was already set from enhanced connection complete
1537                     break;
1538                 default:
1539                     break;
1540             }
1541         }
1542     }
1543 };
1544 #endif
1545 #endif
1546 
1547 #ifdef ENABLE_LE_CENTRAL
1548 
1549 /**
1550  * @brief Get own addr type and address used for LE connections (Central)
1551  */
1552 void gap_le_get_own_connection_address(uint8_t * addr_type, bd_addr_t addr){
1553     *addr_type = hci_stack->le_connection_own_addr_type;
1554     hci_get_own_address_for_addr_type(hci_stack->le_connection_own_addr_type, addr);
1555 }
1556 
1557 void le_handle_advertisement_report(uint8_t *packet, uint16_t size){
1558 
1559     uint16_t offset = 3;
1560     uint8_t num_reports = packet[offset];
1561     offset += 1;
1562 
1563     uint16_t i;
1564     uint8_t event[12 + LE_ADVERTISING_DATA_SIZE]; // use upper bound to avoid var size automatic var
1565     for (i=0; (i<num_reports) && (offset < size);i++){
1566         // sanity checks on data_length:
1567         uint8_t data_length = packet[offset + 8];
1568         if (data_length > LE_ADVERTISING_DATA_SIZE) return;
1569         if ((offset + 9u + data_length + 1u) > size)    return;
1570         // setup event
1571         uint8_t event_size = 10u + data_length;
1572         uint16_t pos = 0;
1573         event[pos++] = GAP_EVENT_ADVERTISING_REPORT;
1574         event[pos++] = event_size;
1575         (void)memcpy(&event[pos], &packet[offset], 1 + 1 + 6); // event type + address type + address
1576         offset += 8;
1577         pos += 8;
1578         event[pos++] = packet[offset + 1 + data_length]; // rssi
1579         event[pos++] = data_length;
1580         offset++;
1581         (void)memcpy(&event[pos], &packet[offset], data_length);
1582         pos +=    data_length;
1583         offset += data_length + 1u; // rssi
1584         hci_emit_btstack_event(event, pos, 1);
1585     }
1586 }
1587 
1588 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
1589 static void le_handle_extended_advertisement_report(uint8_t *packet, uint16_t size) {
1590     uint16_t offset = 3;
1591     uint8_t num_reports = packet[offset++];
1592     uint8_t event[2 + 255]; // use upper bound to avoid var size automatic var
1593     uint8_t i;
1594     for (i=0; (i<num_reports) && (offset < size);i++){
1595         // sanity checks on data_length:
1596         uint16_t data_length = packet[offset + 23];
1597         if (data_length > LE_EXTENDED_ADVERTISING_DATA_SIZE) return;
1598         if ((offset + 24u + data_length) > size)    return;
1599         uint16_t event_type = little_endian_read_16(packet, offset);
1600         offset += 2;
1601         if ((event_type & 0x10) != 0) {
1602            // setup legacy event
1603             uint8_t legacy_event_type;
1604             switch (event_type){
1605                 case 0b0010011:
1606                     // ADV_IND
1607                     legacy_event_type = 0;
1608                     break;
1609                 case 0b0010101:
1610                     // ADV_DIRECT_IND
1611                     legacy_event_type = 1;
1612                     break;
1613                 case 0b0010010:
1614                     // ADV_SCAN_IND
1615                     legacy_event_type = 2;
1616                     break;
1617                 case 0b0010000:
1618                     // ADV_NONCONN_IND
1619                     legacy_event_type = 3;
1620                     break;
1621                 case 0b0011011:
1622                 case 0b0011010:
1623                     // SCAN_RSP
1624                     legacy_event_type = 4;
1625                     break;
1626                 default:
1627                     legacy_event_type = 0;
1628                     break;
1629             }
1630             uint16_t pos = 0;
1631             event[pos++] = GAP_EVENT_ADVERTISING_REPORT;
1632             event[pos++] = 10u + data_length;
1633             event[pos++] = legacy_event_type;
1634             // copy address type + address
1635             (void) memcpy(&event[pos], &packet[offset], 1 + 6);
1636             offset += 7;
1637             pos += 7;
1638             // skip primary_phy, secondary_phy, advertising_sid, tx_power
1639             offset += 4;
1640             // copy rssi
1641             event[pos++] = packet[offset++];
1642             // skip periodic advertising interval and direct address
1643             offset += 9;
1644             // copy data len + data;
1645             (void) memcpy(&event[pos], &packet[offset], 1 + data_length);
1646             pos    += 1 +data_length;
1647             offset += 1+ data_length;
1648             hci_emit_btstack_event(event, pos, 1);
1649         } else {
1650             event[0] = GAP_EVENT_EXTENDED_ADVERTISING_REPORT;
1651             uint8_t report_len = 24 + data_length;
1652             event[1] = report_len;
1653             little_endian_store_16(event, 2, event_type);
1654             memcpy(&event[4], &packet[offset], report_len);
1655             offset += report_len;
1656             hci_emit_btstack_event(event, 2 + report_len, 1);
1657         }
1658     }
1659 }
1660 #endif
1661 
1662 #endif
1663 #endif
1664 
1665 #ifdef ENABLE_BLE
1666 #ifdef ENABLE_LE_PERIPHERAL
1667 static void hci_update_advertisements_enabled_for_current_roles(void){
1668     if ((hci_stack->le_advertisements_state & LE_ADVERTISEMENT_STATE_ENABLED) != 0){
1669         // get number of active le slave connections
1670         int num_slave_connections = 0;
1671         btstack_linked_list_iterator_t it;
1672         btstack_linked_list_iterator_init(&it, &hci_stack->connections);
1673         while (btstack_linked_list_iterator_has_next(&it)){
1674             hci_connection_t * con = (hci_connection_t*) btstack_linked_list_iterator_next(&it);
1675             log_info("state %u, role %u, le_con %u", con->state, con->role, hci_is_le_connection(con));
1676             if (con->state != OPEN) continue;
1677             if (con->role  != HCI_ROLE_SLAVE) continue;
1678             if (!hci_is_le_connection(con)) continue;
1679             num_slave_connections++;
1680         }
1681         log_info("Num LE Peripheral roles: %u of %u", num_slave_connections, hci_stack->le_max_number_peripheral_connections);
1682         hci_stack->le_advertisements_enabled_for_current_roles = num_slave_connections < hci_stack->le_max_number_peripheral_connections;
1683     } else {
1684         hci_stack->le_advertisements_enabled_for_current_roles = false;
1685     }
1686 }
1687 #endif
1688 #endif
1689 
1690 #ifdef ENABLE_CLASSIC
1691 static void gap_run_set_local_name(void){
1692     hci_reserve_packet_buffer();
1693     uint8_t * packet = hci_stack->hci_packet_buffer;
1694     // construct HCI Command and send
1695     uint16_t opcode = hci_write_local_name.opcode;
1696     packet[0] = opcode & 0xff;
1697     packet[1] = opcode >> 8;
1698     packet[2] = DEVICE_NAME_LEN;
1699     memset(&packet[3], 0, DEVICE_NAME_LEN);
1700     uint16_t name_len = (uint16_t) strlen(hci_stack->local_name);
1701     uint16_t bytes_to_copy = btstack_min(name_len, DEVICE_NAME_LEN);
1702     // if shorter than DEVICE_NAME_LEN, it's implicitly NULL-terminated by memset call
1703     (void)memcpy(&packet[3], hci_stack->local_name, bytes_to_copy);
1704     // expand '00:00:00:00:00:00' in name with bd_addr
1705     btstack_replace_bd_addr_placeholder(&packet[3], bytes_to_copy, hci_stack->local_bd_addr);
1706     hci_send_prepared_cmd_packet();
1707 }
1708 
1709 static void gap_run_set_eir_data(void){
1710     hci_reserve_packet_buffer();
1711     uint8_t * packet = hci_stack->hci_packet_buffer;
1712     // construct HCI Command in-place and send
1713     uint16_t opcode = hci_write_extended_inquiry_response.opcode;
1714     uint16_t offset = 0;
1715     packet[offset++] = opcode & 0xff;
1716     packet[offset++] = opcode >> 8;
1717     packet[offset++] = 1 + EXTENDED_INQUIRY_RESPONSE_DATA_LEN;
1718     packet[offset++] = 0;  // FEC not required
1719     memset(&packet[offset], 0, EXTENDED_INQUIRY_RESPONSE_DATA_LEN);
1720     if (hci_stack->eir_data){
1721         // copy items and expand '00:00:00:00:00:00' in name with bd_addr
1722         ad_context_t context;
1723         for (ad_iterator_init(&context, EXTENDED_INQUIRY_RESPONSE_DATA_LEN, hci_stack->eir_data) ; ad_iterator_has_more(&context) ; ad_iterator_next(&context)) {
1724             uint8_t data_type   = ad_iterator_get_data_type(&context);
1725             uint8_t size        = ad_iterator_get_data_len(&context);
1726             const uint8_t *data = ad_iterator_get_data(&context);
1727             // copy item
1728             packet[offset++] = size + 1;
1729             packet[offset++] = data_type;
1730             memcpy(&packet[offset], data, size);
1731             // update name item
1732             if ((data_type == BLUETOOTH_DATA_TYPE_SHORTENED_LOCAL_NAME) || (data_type == BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME)){
1733                 btstack_replace_bd_addr_placeholder(&packet[offset], size, hci_stack->local_bd_addr);
1734             }
1735             offset += size;
1736         }
1737     } else {
1738         uint16_t name_len = (uint16_t) strlen(hci_stack->local_name);
1739         uint16_t bytes_to_copy = btstack_min(name_len, EXTENDED_INQUIRY_RESPONSE_DATA_LEN - 2);
1740         packet[offset++] = bytes_to_copy + 1;
1741         packet[offset++] = BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME;
1742         (void)memcpy(&packet[6], hci_stack->local_name, bytes_to_copy);
1743         // expand '00:00:00:00:00:00' in name with bd_addr
1744         btstack_replace_bd_addr_placeholder(&packet[offset], bytes_to_copy, hci_stack->local_bd_addr);
1745     }
1746     hci_send_prepared_cmd_packet();
1747 }
1748 
1749 static void hci_run_gap_tasks_classic(void){
1750     if ((hci_stack->gap_tasks_classic & GAP_TASK_SET_CLASS_OF_DEVICE) != 0) {
1751         hci_stack->gap_tasks_classic &= ~GAP_TASK_SET_CLASS_OF_DEVICE;
1752         hci_send_cmd(&hci_write_class_of_device, hci_stack->class_of_device);
1753         return;
1754     }
1755     if ((hci_stack->gap_tasks_classic & GAP_TASK_SET_LOCAL_NAME) != 0) {
1756         hci_stack->gap_tasks_classic &= ~GAP_TASK_SET_LOCAL_NAME;
1757         gap_run_set_local_name();
1758         return;
1759     }
1760     if ((hci_stack->gap_tasks_classic & GAP_TASK_SET_EIR_DATA) != 0) {
1761         hci_stack->gap_tasks_classic &= ~GAP_TASK_SET_EIR_DATA;
1762         gap_run_set_eir_data();
1763         return;
1764     }
1765     if ((hci_stack->gap_tasks_classic & GAP_TASK_SET_DEFAULT_LINK_POLICY) != 0) {
1766         hci_stack->gap_tasks_classic &= ~GAP_TASK_SET_DEFAULT_LINK_POLICY;
1767         hci_send_cmd(&hci_write_default_link_policy_setting, hci_stack->default_link_policy_settings);
1768         return;
1769     }
1770     // write page scan activity
1771     if ((hci_stack->gap_tasks_classic & GAP_TASK_WRITE_PAGE_SCAN_ACTIVITY) != 0) {
1772         hci_stack->gap_tasks_classic &= ~GAP_TASK_WRITE_PAGE_SCAN_ACTIVITY;
1773         hci_send_cmd(&hci_write_page_scan_activity, hci_stack->new_page_scan_interval, hci_stack->new_page_scan_window);
1774         return;
1775     }
1776     // write page scan type
1777     if ((hci_stack->gap_tasks_classic & GAP_TASK_WRITE_PAGE_SCAN_TYPE) != 0) {
1778         hci_stack->gap_tasks_classic &= ~GAP_TASK_WRITE_PAGE_SCAN_TYPE;
1779         hci_send_cmd(&hci_write_page_scan_type, hci_stack->new_page_scan_type);
1780         return;
1781     }
1782     // write page timeout
1783     if ((hci_stack->gap_tasks_classic & GAP_TASK_WRITE_PAGE_TIMEOUT) != 0) {
1784         hci_stack->gap_tasks_classic &= ~GAP_TASK_WRITE_PAGE_TIMEOUT;
1785         hci_send_cmd(&hci_write_page_timeout, hci_stack->page_timeout);
1786         return;
1787     }
1788     // send scan enable
1789     if ((hci_stack->gap_tasks_classic & GAP_TASK_WRITE_SCAN_ENABLE) != 0) {
1790         hci_stack->gap_tasks_classic &= ~GAP_TASK_WRITE_SCAN_ENABLE;
1791         hci_send_cmd(&hci_write_scan_enable, hci_stack->new_scan_enable_value);
1792         return;
1793     }
1794     // send write scan activity
1795     if ((hci_stack->gap_tasks_classic & GAP_TASK_WRITE_INQUIRY_SCAN_ACTIVITY) != 0) {
1796         hci_stack->gap_tasks_classic &= ~GAP_TASK_WRITE_INQUIRY_SCAN_ACTIVITY;
1797         hci_send_cmd(&hci_write_inquiry_scan_activity, hci_stack->inquiry_scan_interval, hci_stack->inquiry_scan_window);
1798         return;
1799     }
1800     // send write inquiry transmit power level
1801     if ((hci_stack->gap_tasks_classic & GAP_TASK_WRITE_INQUIRY_TX_POWER_LEVEL) != 0) {
1802         hci_stack->gap_tasks_classic &= ~GAP_TASK_WRITE_INQUIRY_TX_POWER_LEVEL;
1803         hci_send_cmd(&hci_write_inquiry_transmit_power_level, hci_stack->inquiry_tx_power_level);
1804         return;
1805     }
1806 }
1807 #endif
1808 
1809 #ifndef HAVE_HOST_CONTROLLER_API
1810 
1811 static uint32_t hci_transport_uart_get_main_baud_rate(void){
1812     if (!hci_stack->config) return 0;
1813     uint32_t baud_rate = ((hci_transport_config_uart_t *)hci_stack->config)->baudrate_main;
1814     return baud_rate;
1815 }
1816 
1817 static void hci_initialization_timeout_handler(btstack_timer_source_t * ds){
1818     UNUSED(ds);
1819 
1820     switch (hci_stack->substate){
1821         case HCI_INIT_W4_SEND_RESET:
1822             log_info("Resend HCI Reset");
1823             hci_stack->substate = HCI_INIT_SEND_RESET;
1824             hci_stack->num_cmd_packets = 1;
1825             hci_run();
1826             break;
1827         case HCI_INIT_W4_CUSTOM_INIT_CSR_WARM_BOOT_LINK_RESET:
1828             log_info("Resend HCI Reset - CSR Warm Boot with Link Reset");
1829             if (hci_stack->hci_transport->reset_link){
1830                 hci_stack->hci_transport->reset_link();
1831             }
1832 
1833             /* fall through */
1834 
1835         case HCI_INIT_W4_CUSTOM_INIT_CSR_WARM_BOOT:
1836             log_info("Resend HCI Reset - CSR Warm Boot");
1837             hci_stack->substate = HCI_INIT_SEND_RESET_CSR_WARM_BOOT;
1838             hci_stack->num_cmd_packets = 1;
1839             hci_run();
1840             break;
1841         case HCI_INIT_W4_SEND_BAUD_CHANGE:
1842             if (hci_stack->hci_transport->set_baudrate){
1843                 uint32_t baud_rate = hci_transport_uart_get_main_baud_rate();
1844                 log_info("Local baud rate change to %" PRIu32 "(timeout handler)", baud_rate);
1845                 hci_stack->hci_transport->set_baudrate(baud_rate);
1846             }
1847             // For CSR, HCI Reset is sent on new baud rate. Don't forget to reset link for H5/BCSP
1848             if (hci_stack->manufacturer == BLUETOOTH_COMPANY_ID_CAMBRIDGE_SILICON_RADIO){
1849                 if (hci_stack->hci_transport->reset_link){
1850                     log_info("Link Reset");
1851                     hci_stack->hci_transport->reset_link();
1852                 }
1853                 hci_stack->substate = HCI_INIT_SEND_RESET_CSR_WARM_BOOT;
1854                 hci_run();
1855             }
1856             break;
1857         case HCI_INIT_W4_CUSTOM_INIT_BCM_DELAY:
1858             // otherwise continue
1859             hci_stack->substate = HCI_INIT_W4_READ_LOCAL_SUPPORTED_COMMANDS;
1860             hci_send_cmd(&hci_read_local_supported_commands);
1861             break;
1862         default:
1863             break;
1864     }
1865 }
1866 #endif
1867 
1868 static void hci_initializing_next_state(void){
1869     hci_stack->substate = (hci_substate_t )( ((int) hci_stack->substate) + 1);
1870 }
1871 
1872 static void hci_init_done(void){
1873     // done. tell the app
1874     log_info("hci_init_done -> HCI_STATE_WORKING");
1875     hci_stack->state = HCI_STATE_WORKING;
1876     hci_emit_state();
1877 }
1878 
1879 // assumption: hci_can_send_command_packet_now() == true
1880 static void hci_initializing_run(void){
1881     log_debug("hci_initializing_run: substate %u, can send %u", hci_stack->substate, hci_can_send_command_packet_now());
1882 
1883     if (!hci_can_send_command_packet_now()) return;
1884 
1885 #ifndef HAVE_HOST_CONTROLLER_API
1886     bool need_baud_change = hci_stack->config
1887             && hci_stack->chipset
1888             && hci_stack->chipset->set_baudrate_command
1889             && hci_stack->hci_transport->set_baudrate
1890             && ((hci_transport_config_uart_t *)hci_stack->config)->baudrate_main;
1891 #endif
1892 
1893     switch (hci_stack->substate){
1894         case HCI_INIT_SEND_RESET:
1895             hci_state_reset();
1896 
1897 #ifndef HAVE_HOST_CONTROLLER_API
1898             // prepare reset if command complete not received in 100ms
1899             btstack_run_loop_set_timer(&hci_stack->timeout, HCI_RESET_RESEND_TIMEOUT_MS);
1900             btstack_run_loop_set_timer_handler(&hci_stack->timeout, hci_initialization_timeout_handler);
1901             btstack_run_loop_add_timer(&hci_stack->timeout);
1902 #endif
1903             // send command
1904             hci_stack->substate = HCI_INIT_W4_SEND_RESET;
1905             hci_send_cmd(&hci_reset);
1906             break;
1907         case HCI_INIT_SEND_READ_LOCAL_VERSION_INFORMATION:
1908             hci_send_cmd(&hci_read_local_version_information);
1909             hci_stack->substate = HCI_INIT_W4_SEND_READ_LOCAL_VERSION_INFORMATION;
1910             break;
1911 
1912 #ifndef HAVE_HOST_CONTROLLER_API
1913         case HCI_INIT_SEND_RESET_CSR_WARM_BOOT:
1914             hci_state_reset();
1915             // prepare reset if command complete not received in 100ms
1916             btstack_run_loop_set_timer(&hci_stack->timeout, HCI_RESET_RESEND_TIMEOUT_MS);
1917             btstack_run_loop_set_timer_handler(&hci_stack->timeout, hci_initialization_timeout_handler);
1918             btstack_run_loop_add_timer(&hci_stack->timeout);
1919             // send command
1920             hci_stack->substate = HCI_INIT_W4_CUSTOM_INIT_CSR_WARM_BOOT;
1921             hci_send_cmd(&hci_reset);
1922             break;
1923         case HCI_INIT_SEND_RESET_ST_WARM_BOOT:
1924             hci_state_reset();
1925             hci_stack->substate = HCI_INIT_W4_SEND_RESET_ST_WARM_BOOT;
1926             hci_send_cmd(&hci_reset);
1927             break;
1928         case HCI_INIT_SEND_BAUD_CHANGE_BCM: {
1929             hci_reserve_packet_buffer();
1930             uint32_t baud_rate = hci_transport_uart_get_main_baud_rate();
1931             hci_stack->chipset->set_baudrate_command(baud_rate, hci_stack->hci_packet_buffer);
1932             hci_stack->substate = HCI_INIT_W4_SEND_BAUD_CHANGE_BCM;
1933             hci_send_prepared_cmd_packet();
1934             break;
1935         }
1936         case HCI_INIT_SET_BD_ADDR:
1937             hci_reserve_packet_buffer();
1938             log_info("Set Public BD ADDR to %s", bd_addr_to_str(hci_stack->custom_bd_addr));
1939             hci_stack->chipset->set_bd_addr_command(hci_stack->custom_bd_addr, hci_stack->hci_packet_buffer);
1940             hci_stack->substate = HCI_INIT_W4_SET_BD_ADDR;
1941             hci_send_prepared_cmd_packet();
1942             break;
1943         case HCI_INIT_SEND_READ_LOCAL_NAME:
1944 #ifdef ENABLE_CLASSIC
1945             hci_send_cmd(&hci_read_local_name);
1946             hci_stack->substate = HCI_INIT_W4_SEND_READ_LOCAL_NAME;
1947             break;
1948 #endif
1949             /* fall through */
1950 
1951         case HCI_INIT_SEND_BAUD_CHANGE:
1952             if (need_baud_change) {
1953                 hci_reserve_packet_buffer();
1954                 uint32_t baud_rate = hci_transport_uart_get_main_baud_rate();
1955                 hci_stack->chipset->set_baudrate_command(baud_rate, hci_stack->hci_packet_buffer);
1956                 hci_stack->substate = HCI_INIT_W4_SEND_BAUD_CHANGE;
1957                 hci_send_prepared_cmd_packet();
1958                 // STLC25000D: baudrate change happens within 0.5 s after command was send,
1959                 // use timer to update baud rate after 100 ms (knowing exactly, when command was sent is non-trivial)
1960                 if (hci_stack->manufacturer == BLUETOOTH_COMPANY_ID_ST_MICROELECTRONICS){
1961                     btstack_run_loop_set_timer(&hci_stack->timeout, HCI_RESET_RESEND_TIMEOUT_MS);
1962                     btstack_run_loop_add_timer(&hci_stack->timeout);
1963                }
1964                break;
1965             }
1966             hci_stack->substate = HCI_INIT_CUSTOM_INIT;
1967 
1968             /* fall through */
1969 
1970         case HCI_INIT_CUSTOM_INIT:
1971         case HCI_INIT_CUSTOM_PRE_INIT:
1972             // Custom initialization
1973             if (hci_stack->chipset && hci_stack->chipset->next_command){
1974                 hci_reserve_packet_buffer();
1975                 hci_stack->chipset_result = (*hci_stack->chipset->next_command)(hci_stack->hci_packet_buffer);
1976                 bool send_cmd = false;
1977                 switch (hci_stack->chipset_result){
1978                     case BTSTACK_CHIPSET_VALID_COMMAND:
1979                         send_cmd = true;
1980                         switch (hci_stack->substate){
1981                             case HCI_INIT_CUSTOM_INIT:
1982                                 hci_stack->substate = HCI_INIT_W4_CUSTOM_INIT;
1983                                 break;
1984                             case HCI_INIT_CUSTOM_PRE_INIT:
1985                                 hci_stack->substate = HCI_INIT_W4_CUSTOM_PRE_INIT;
1986                                 break;
1987                             default:
1988                                 btstack_assert(false);
1989                                 break;
1990                         }
1991                         break;
1992                     case BTSTACK_CHIPSET_WARMSTART_REQUIRED:
1993                         send_cmd = true;
1994                         // CSR Warm Boot: Wait a bit, then send HCI Reset until HCI Command Complete
1995                         log_info("CSR Warm Boot");
1996                         btstack_run_loop_set_timer(&hci_stack->timeout, HCI_RESET_RESEND_TIMEOUT_MS);
1997                         btstack_run_loop_set_timer_handler(&hci_stack->timeout, hci_initialization_timeout_handler);
1998                         btstack_run_loop_add_timer(&hci_stack->timeout);
1999                         if ((hci_stack->manufacturer == BLUETOOTH_COMPANY_ID_CAMBRIDGE_SILICON_RADIO)
2000                             && hci_stack->config
2001                             && hci_stack->chipset
2002                             // && hci_stack->chipset->set_baudrate_command -- there's no such command
2003                             && hci_stack->hci_transport->set_baudrate
2004                             && hci_transport_uart_get_main_baud_rate()){
2005                             hci_stack->substate = HCI_INIT_W4_SEND_BAUD_CHANGE;
2006                         } else {
2007                            hci_stack->substate = HCI_INIT_W4_CUSTOM_INIT_CSR_WARM_BOOT_LINK_RESET;
2008                         }
2009                         break;
2010                     default:
2011                         break;
2012                 }
2013 
2014                 if (send_cmd){
2015                     hci_send_prepared_cmd_packet();
2016                     break;
2017                 } else {
2018                     hci_release_packet_buffer();
2019                 }
2020                 log_info("Init script done");
2021 
2022                 // Custom Pre-Init complete, start regular init with HCI Reset
2023                 if (hci_stack->substate == HCI_INIT_CUSTOM_PRE_INIT){
2024                     hci_stack->substate = HCI_INIT_W4_SEND_RESET;
2025                     hci_send_cmd(&hci_reset);
2026                     break;
2027                 }
2028 
2029                 // Init script download on Broadcom chipsets causes:
2030                 if ( (hci_stack->chipset_result != BTSTACK_CHIPSET_NO_INIT_SCRIPT) &&
2031                    (  (hci_stack->manufacturer == BLUETOOTH_COMPANY_ID_BROADCOM_CORPORATION)
2032                 ||    (hci_stack->manufacturer == BLUETOOTH_COMPANY_ID_EM_MICROELECTRONIC_MARIN_SA)) ){
2033 
2034                     // - baud rate to reset, restore UART baud rate if needed
2035                     if (need_baud_change) {
2036                         uint32_t baud_rate = ((hci_transport_config_uart_t *)hci_stack->config)->baudrate_init;
2037                         log_info("Local baud rate change to %" PRIu32 " after init script (bcm)", baud_rate);
2038                         hci_stack->hci_transport->set_baudrate(baud_rate);
2039                     }
2040 
2041                     uint16_t bcm_delay_ms = 300;
2042                     // - UART may or may not be disabled during update and Controller RTS may or may not be high during this time
2043                     //   -> Work around: wait here.
2044                     log_info("BCM delay (%u ms) after init script", bcm_delay_ms);
2045                     hci_stack->substate = HCI_INIT_W4_CUSTOM_INIT_BCM_DELAY;
2046                     btstack_run_loop_set_timer(&hci_stack->timeout, bcm_delay_ms);
2047                     btstack_run_loop_set_timer_handler(&hci_stack->timeout, hci_initialization_timeout_handler);
2048                     btstack_run_loop_add_timer(&hci_stack->timeout);
2049                     break;
2050                 }
2051             }
2052 #endif
2053             /* fall through */
2054 
2055         case HCI_INIT_READ_LOCAL_SUPPORTED_COMMANDS:
2056             hci_stack->substate = HCI_INIT_W4_READ_LOCAL_SUPPORTED_COMMANDS;
2057             hci_send_cmd(&hci_read_local_supported_commands);
2058             break;
2059         case HCI_INIT_READ_BD_ADDR:
2060             hci_stack->substate = HCI_INIT_W4_READ_BD_ADDR;
2061             hci_send_cmd(&hci_read_bd_addr);
2062             break;
2063         case HCI_INIT_READ_BUFFER_SIZE:
2064             // only read buffer size if supported
2065             if (hci_command_supported(SUPPORTED_HCI_COMMAND_READ_BUFFER_SIZE)){
2066                 hci_stack->substate = HCI_INIT_W4_READ_BUFFER_SIZE;
2067                 hci_send_cmd(&hci_read_buffer_size);
2068                 break;
2069             }
2070 
2071             /* fall through */
2072 
2073         case HCI_INIT_READ_LOCAL_SUPPORTED_FEATURES:
2074             hci_stack->substate = HCI_INIT_W4_READ_LOCAL_SUPPORTED_FEATURES;
2075             hci_send_cmd(&hci_read_local_supported_features);
2076             break;
2077 
2078 #ifdef ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL
2079         case HCI_INIT_SET_CONTROLLER_TO_HOST_FLOW_CONTROL:
2080             hci_stack->substate = HCI_INIT_W4_SET_CONTROLLER_TO_HOST_FLOW_CONTROL;
2081             hci_send_cmd(&hci_set_controller_to_host_flow_control, 3);  // ACL + SCO Flow Control
2082             break;
2083         case HCI_INIT_HOST_BUFFER_SIZE:
2084             hci_stack->substate = HCI_INIT_W4_HOST_BUFFER_SIZE;
2085             hci_send_cmd(&hci_host_buffer_size, HCI_HOST_ACL_PACKET_LEN, HCI_HOST_SCO_PACKET_LEN,
2086                                                 HCI_HOST_ACL_PACKET_NUM, HCI_HOST_SCO_PACKET_NUM);
2087             break;
2088 #endif
2089 
2090         case HCI_INIT_SET_EVENT_MASK:
2091             hci_stack->substate = HCI_INIT_W4_SET_EVENT_MASK;
2092             if (hci_le_supported()){
2093                 hci_send_cmd(&hci_set_event_mask,0xFFFFFFFFU, 0x3FFFFFFFU);
2094             } else {
2095                 // Kensington Bluetooth 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff...
2096                 hci_send_cmd(&hci_set_event_mask,0xFFFFFFFFU, 0x1FFFFFFFU);
2097             }
2098             break;
2099 
2100         case HCI_INIT_SET_EVENT_MASK_2:
2101             // On Bluetooth PTS dongle (BL 654) with PacketCraft HCI Firmware (LMP subversion) 0x5244,
2102             // setting Event Mask 2 causes Controller to drop Encryption Change events.
2103             if (hci_command_supported(SUPPORTED_HCI_COMMAND_SET_EVENT_MASK_PAGE_2)
2104             && (hci_stack->manufacturer != BLUETOOTH_COMPANY_ID_PACKETCRAFT_INC)){
2105                 hci_stack->substate = HCI_INIT_W4_SET_EVENT_MASK_2;
2106                 // Encryption Change Event v2 - bit 25
2107                 hci_send_cmd(&hci_set_event_mask_2,0x02000000U, 0x0);
2108                 break;
2109             }
2110 
2111 #ifdef ENABLE_CLASSIC
2112             /* fall through */
2113 
2114         case HCI_INIT_WRITE_SIMPLE_PAIRING_MODE:
2115             if (hci_classic_supported() && gap_ssp_supported()){
2116                 hci_stack->substate = HCI_INIT_W4_WRITE_SIMPLE_PAIRING_MODE;
2117                 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack->ssp_enable);
2118                 break;
2119             }
2120 
2121             /* fall through */
2122 
2123         case HCI_INIT_WRITE_INQUIRY_MODE:
2124             if (hci_classic_supported()){
2125                 hci_stack->substate = HCI_INIT_W4_WRITE_INQUIRY_MODE;
2126                 hci_send_cmd(&hci_write_inquiry_mode, (int) hci_stack->inquiry_mode);
2127                 break;
2128             }
2129 
2130             /* fall through */
2131 
2132         case HCI_INIT_WRITE_SECURE_CONNECTIONS_HOST_ENABLE:
2133             // skip write secure connections host support if not supported or disabled
2134             if (hci_classic_supported() && hci_stack->secure_connections_enable
2135             && hci_command_supported(SUPPORTED_HCI_COMMAND_WRITE_SECURE_CONNECTIONS_HOST)) {
2136                 hci_stack->secure_connections_active = true;
2137                 hci_stack->substate = HCI_INIT_W4_WRITE_SECURE_CONNECTIONS_HOST_ENABLE;
2138                 hci_send_cmd(&hci_write_secure_connections_host_support, 1);
2139                 break;
2140             }
2141 
2142             /* fall through */
2143 
2144         case HCI_INIT_SET_MIN_ENCRYPTION_KEY_SIZE:
2145             // skip set min encryption key size
2146             if (hci_classic_supported() && hci_command_supported(SUPPORTED_HCI_COMMAND_SET_MIN_ENCRYPTION_KEY_SIZE)) {
2147                 hci_stack->substate = HCI_INIT_W4_SET_MIN_ENCRYPTION_KEY_SIZE;
2148                 hci_send_cmd(&hci_set_min_encryption_key_size, hci_stack->gap_required_encyrption_key_size);
2149                 break;
2150             }
2151 
2152 #ifdef ENABLE_SCO_OVER_HCI
2153             /* fall through */
2154 
2155         // only sent if ENABLE_SCO_OVER_HCI is defined
2156         case HCI_INIT_WRITE_SYNCHRONOUS_FLOW_CONTROL_ENABLE:
2157             // skip write synchronous flow control if not supported
2158             if (hci_classic_supported()
2159             && hci_command_supported(SUPPORTED_HCI_COMMAND_WRITE_SYNCHRONOUS_FLOW_CONTROL_ENABLE)) {
2160                 hci_stack->substate = HCI_INIT_W4_WRITE_SYNCHRONOUS_FLOW_CONTROL_ENABLE;
2161                 hci_send_cmd(&hci_write_synchronous_flow_control_enable, 1); // SCO tracking enabled
2162                 break;
2163             }
2164             /* fall through */
2165 
2166         case HCI_INIT_WRITE_DEFAULT_ERRONEOUS_DATA_REPORTING:
2167             // skip write default erroneous data reporting if not supported
2168             if (hci_classic_supported()
2169             && hci_command_supported(SUPPORTED_HCI_COMMAND_WRITE_DEFAULT_ERRONEOUS_DATA_REPORTING)) {
2170                 hci_stack->substate = HCI_INIT_W4_WRITE_DEFAULT_ERRONEOUS_DATA_REPORTING;
2171                 hci_send_cmd(&hci_write_default_erroneous_data_reporting, 1);
2172                 break;
2173             }
2174 #endif
2175 
2176 #if defined(ENABLE_SCO_OVER_HCI) || defined(ENABLE_SCO_OVER_PCM)
2177             /* fall through */
2178 
2179         // only sent if manufacturer is Broadcom and ENABLE_SCO_OVER_HCI or ENABLE_SCO_OVER_PCM is defined
2180         case HCI_INIT_BCM_WRITE_SCO_PCM_INT:
2181             if (hci_classic_supported() && (hci_stack->manufacturer == BLUETOOTH_COMPANY_ID_BROADCOM_CORPORATION)){
2182                 hci_stack->substate = HCI_INIT_W4_BCM_WRITE_SCO_PCM_INT;
2183 #ifdef ENABLE_SCO_OVER_HCI
2184                 log_info("BCM: Route SCO data via HCI transport");
2185                 hci_send_cmd(&hci_bcm_write_sco_pcm_int, 1, 0, 0, 0, 0);
2186 #endif
2187 #ifdef ENABLE_SCO_OVER_PCM
2188                 log_info("BCM: Route SCO data via PCM interface");
2189 #ifdef ENABLE_BCM_PCM_WBS
2190                 // 512 kHz bit clock for 2 channels x 16 bit x 16 kHz
2191                 hci_send_cmd(&hci_bcm_write_sco_pcm_int, 0, 2, 0, 1, 1);
2192 #else
2193                 // 256 kHz bit clock for 2 channels x 16 bit x 8 kHz
2194                 hci_send_cmd(&hci_bcm_write_sco_pcm_int, 0, 1, 0, 1, 1);
2195 #endif
2196 #endif
2197                 break;
2198             }
2199 #endif
2200 
2201 #ifdef ENABLE_SCO_OVER_PCM
2202             /* fall through */
2203 
2204         case HCI_INIT_BCM_WRITE_I2SPCM_INTERFACE_PARAM:
2205             if (hci_classic_supported() && (hci_stack->manufacturer == BLUETOOTH_COMPANY_ID_BROADCOM_CORPORATION)){
2206                 hci_stack->substate = HCI_INIT_W4_BCM_WRITE_I2SPCM_INTERFACE_PARAM;
2207                 log_info("BCM: Config PCM interface for I2S");
2208 #ifdef ENABLE_BCM_PCM_WBS
2209                 // 512 kHz bit clock for 2 channels x 16 bit x 8 kHz
2210                 hci_send_cmd(&hci_bcm_write_i2spcm_interface_param, 1, 1, 0, 2);
2211 #else
2212                 // 256 kHz bit clock for 2 channels x 16 bit x 8 kHz
2213                 hci_send_cmd(&hci_bcm_write_i2spcm_interface_param, 1, 1, 0, 1);
2214 #endif
2215                 break;
2216             }
2217         case HCI_INIT_BCM_WRITE_PCM_DATA_FORMAT_PARAM:
2218             if (hci_classic_supported() && (hci_stack->manufacturer == BLUETOOTH_COMPANY_ID_BROADCOM_CORPORATION)){
2219                 hci_stack->substate = HCI_INIT_W4_BCM_WRITE_PCM_DATA_FORMAT_PARAM;
2220                 log_info("BCM: Config PCM Data format");
2221                 // msb first, fill bits 0, left justified
2222                 hci_send_cmd(&hci_bcm_write_pcm_data_format_param, 0, 0, 3, 3, 0);
2223                 break;
2224             }
2225 #ifdef HAVE_BCM_PCM2
2226         case HCI_INIT_BCM_PCM2_SETUP:
2227             if (hci_classic_supported() && (hci_stack->manufacturer == BLUETOOTH_COMPANY_ID_BROADCOM_CORPORATION)) {
2228                 hci_stack->substate = HCI_INIT_W4_BCM_PCM2_SETUP;
2229                 uint8_t  op_mode = 0;  // Op_Mode = 0 = PCM, 1 = I2S
2230                 uint32_t pcm_clock_freq;
2231                 uint8_t  ch_0_period;
2232 #ifdef ENABLE_BCM_PCM_WBS
2233                 // 512 kHz, resample 8 kHz to 16 khz
2234                 pcm_clock_freq = 512000;
2235                 ch_0_period = 1;
2236 #else
2237                 // 256 khz, 8 khz output
2238                 pcm_clock_freq = 256000;
2239                 ch_0_period = 0;
2240 #endif
2241                 log_info("BCM: Config PCM2 - op mode %u, pcm clock %" PRIu32 ", ch0_period %u", op_mode, pcm_clock_freq, ch_0_period);
2242                 hci_send_cmd(&hci_bcm_pcm2_setup,
2243                              0x00, // Action = Write
2244                              0x00, // Test_Options = None
2245                              op_mode, // Op_Mode
2246                              0x1D, // Sync_and_Clock_Options Sync = Signal | Sync Output Enable | Generate PCM_CLK | Tristate When Idle
2247                              pcm_clock_freq, // PCM_Clock_Freq
2248                              0x01, // Sync_Signal_Width
2249                              0x0F, // Slot_Width
2250                              0x01, // NumberOfSlots
2251                              0x00, // Bank_0_Fill_Mode = 0s
2252                              0x00, // Bank_0_Number_of_Fill_Bits
2253                              0x00, // Bank_0_Programmable_Fill_Data
2254                              0x00, // Bank_1_Fill_Mode = 0s
2255                              0x00, // Bank_1_Number_of_Fill_Bits
2256                              0x00, // Bank_1_Programmable_Fill_Data
2257                              0x00, // Data_Justify_And_Bit_Order_Options = Left Justify
2258                              0x00, // Ch_0_Slot_Number
2259                              0x01, // Ch_1_Slot_Number
2260                              0x02, // Ch_2_Slot_Number
2261                              0x03, // Ch_3_Slot_Number
2262                              0x04, // Ch_4_Slot_Number
2263                              ch_0_period, // Ch_0_Period
2264                              0x00, // Ch_1_Period
2265                              0x00  // Ch_2_Period
2266                 );
2267                 break;
2268             }
2269 #endif
2270 #endif /* ENABLE_SCO_OVER_PCM */
2271 #endif /* ENABLE_CLASSIC */
2272 
2273 #ifdef ENABLE_BLE
2274             /* fall through */
2275 
2276         // LE INIT
2277         case HCI_INIT_LE_READ_BUFFER_SIZE:
2278             if (hci_le_supported()){
2279                 hci_stack->substate = HCI_INIT_W4_LE_READ_BUFFER_SIZE;
2280                 if (hci_command_supported(SUPPORTED_HCI_COMMAND_LE_READ_BUFFER_SIZE_V2)){
2281                     hci_send_cmd(&hci_le_read_buffer_size_v2);
2282                 } else {
2283                     hci_send_cmd(&hci_le_read_buffer_size);
2284                 }
2285                 break;
2286             }
2287 
2288             /* fall through */
2289 
2290         case HCI_INIT_WRITE_LE_HOST_SUPPORTED:
2291             // skip write le host if not supported (e.g. on LE only EM9301)
2292             if (hci_le_supported()
2293             && hci_command_supported(SUPPORTED_HCI_COMMAND_WRITE_LE_HOST_SUPPORTED)) {
2294                 // LE Supported Host = 1, Simultaneous Host = 0
2295                 hci_stack->substate = HCI_INIT_W4_WRITE_LE_HOST_SUPPORTED;
2296                 hci_send_cmd(&hci_write_le_host_supported, 1, 0);
2297                 break;
2298             }
2299 
2300             /* fall through */
2301 
2302         case HCI_INIT_LE_SET_EVENT_MASK:
2303             if (hci_le_supported()){
2304                 hci_stack->substate = HCI_INIT_W4_LE_SET_EVENT_MASK;
2305 #ifdef ENABLE_LE_ENHANCED_CONNECTION_COMPLETE_EVENT
2306                 hci_send_cmd(&hci_le_set_event_mask, 0xffffffff, 0x0107); // all events from core v5.3
2307 #else
2308                 hci_send_cmd(&hci_le_set_event_mask, 0xfffffdff, 0x0007); // all events from core v5.3 without LE Enhanced Connection Complete
2309 #endif
2310                 break;
2311             }
2312 #endif
2313 
2314 #ifdef ENABLE_LE_DATA_LENGTH_EXTENSION
2315             /* fall through */
2316 
2317         case HCI_INIT_LE_READ_MAX_DATA_LENGTH:
2318             if (hci_le_supported()
2319             && hci_command_supported(SUPPORTED_HCI_COMMAND_LE_READ_MAXIMUM_DATA_LENGTH)) {
2320                 hci_stack->substate = HCI_INIT_W4_LE_READ_MAX_DATA_LENGTH;
2321                 hci_send_cmd(&hci_le_read_maximum_data_length);
2322                 break;
2323             }
2324 
2325             /* fall through */
2326 
2327         case HCI_INIT_LE_WRITE_SUGGESTED_DATA_LENGTH:
2328             if (hci_le_supported()
2329             && hci_command_supported(SUPPORTED_HCI_COMMAND_LE_WRITE_SUGGESTED_DEFAULT_DATA_LENGTH)) {
2330                 hci_stack->substate = HCI_INIT_W4_LE_WRITE_SUGGESTED_DATA_LENGTH;
2331                 hci_send_cmd(&hci_le_write_suggested_default_data_length, hci_stack->le_supported_max_tx_octets, hci_stack->le_supported_max_tx_time);
2332                 break;
2333             }
2334 #endif
2335 
2336 #ifdef ENABLE_LE_CENTRAL
2337             /* fall through */
2338 
2339         case HCI_INIT_READ_WHITE_LIST_SIZE:
2340             if (hci_le_supported()){
2341                 hci_stack->substate = HCI_INIT_W4_READ_WHITE_LIST_SIZE;
2342                 hci_send_cmd(&hci_le_read_white_list_size);
2343                 break;
2344             }
2345 
2346 #endif
2347 
2348 #ifdef ENABLE_LE_PERIPHERAL
2349 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
2350             /* fall through */
2351 
2352         case HCI_INIT_LE_READ_MAX_ADV_DATA_LEN:
2353             if (hci_le_extended_advertising_supported()){
2354                 hci_stack->substate = HCI_INIT_W4_LE_READ_MAX_ADV_DATA_LEN;
2355                 hci_send_cmd(&hci_le_read_maximum_advertising_data_length);
2356                 break;
2357             }
2358 #endif
2359 #endif
2360             /* fall through */
2361 
2362 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
2363     case HCI_INIT_LE_SET_HOST_FEATURE_CONNECTED_ISO_STREAMS:
2364             if (hci_le_supported()) {
2365                 hci_stack->substate = HCI_INIT_W4_LE_SET_HOST_FEATURE_CONNECTED_ISO_STREAMS;
2366                 hci_send_cmd(&hci_le_set_host_feature, 32, 1);
2367                 break;
2368             }
2369 #endif
2370 
2371             /* fall through */
2372 
2373         case HCI_INIT_DONE:
2374             hci_stack->substate = HCI_INIT_DONE;
2375             // main init sequence complete
2376 #ifdef ENABLE_CLASSIC
2377             // check if initial Classic GAP Tasks are completed
2378             if (hci_classic_supported() && (hci_stack->gap_tasks_classic != 0)) {
2379                 hci_run_gap_tasks_classic();
2380                 break;
2381             }
2382 #endif
2383 #ifdef ENABLE_BLE
2384 #ifdef ENABLE_LE_CENTRAL
2385             // check if initial LE GAP Tasks are completed
2386             if (hci_le_supported() && hci_stack->le_scanning_param_update) {
2387                 hci_run_general_gap_le();
2388                 break;
2389             }
2390 #endif
2391 #endif
2392             hci_init_done();
2393             break;
2394 
2395         default:
2396             return;
2397     }
2398 }
2399 
2400 static bool hci_initializing_event_handler_command_completed(const uint8_t * packet){
2401     bool command_completed = false;
2402     if (hci_event_packet_get_type(packet) == HCI_EVENT_COMMAND_COMPLETE){
2403         uint16_t opcode = little_endian_read_16(packet,3);
2404         if (opcode == hci_stack->last_cmd_opcode){
2405             command_completed = true;
2406             log_debug("Command complete for expected opcode %04x at substate %u", opcode, hci_stack->substate);
2407         } else {
2408             log_info("Command complete for different opcode %04x, expected %04x, at substate %u", opcode, hci_stack->last_cmd_opcode, hci_stack->substate);
2409         }
2410     }
2411 
2412     if (hci_event_packet_get_type(packet) == HCI_EVENT_COMMAND_STATUS){
2413         uint8_t  status = packet[2];
2414         uint16_t opcode = little_endian_read_16(packet,4);
2415         if (opcode == hci_stack->last_cmd_opcode){
2416             if (status){
2417                 command_completed = true;
2418                 log_debug("Command status error 0x%02x for expected opcode %04x at substate %u", status, opcode, hci_stack->substate);
2419             } else {
2420                 log_info("Command status OK for expected opcode %04x, waiting for command complete", opcode);
2421             }
2422         } else {
2423             log_debug("Command status for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode);
2424         }
2425     }
2426 #ifndef HAVE_HOST_CONTROLLER_API
2427     // Vendor == CSR
2428     if ((hci_stack->substate == HCI_INIT_W4_CUSTOM_INIT) && (hci_event_packet_get_type(packet) == HCI_EVENT_VENDOR_SPECIFIC)){
2429         // TODO: track actual command
2430         command_completed = true;
2431     }
2432 
2433     // Vendor == Toshiba
2434     if ((hci_stack->substate == HCI_INIT_W4_SEND_BAUD_CHANGE) && (hci_event_packet_get_type(packet) == HCI_EVENT_VENDOR_SPECIFIC)){
2435         // TODO: track actual command
2436         command_completed = true;
2437         // Fix: no HCI Command Complete received, so num_cmd_packets not reset
2438         hci_stack->num_cmd_packets = 1;
2439     }
2440 #endif
2441 
2442     return command_completed;
2443 }
2444 
2445 static void hci_initializing_event_handler(const uint8_t * packet, uint16_t size){
2446 
2447     UNUSED(size);   // ok: less than 6 bytes are read from our buffer
2448 
2449     bool command_completed =  hci_initializing_event_handler_command_completed(packet);
2450 
2451 #ifndef HAVE_HOST_CONTROLLER_API
2452 
2453     // Late response (> 100 ms) for HCI Reset e.g. on Toshiba TC35661:
2454     // Command complete for HCI Reset arrives after we've resent the HCI Reset command
2455     //
2456     // HCI Reset
2457     // Timeout 100 ms
2458     // HCI Reset
2459     // Command Complete Reset
2460     // HCI Read Local Version Information
2461     // Command Complete Reset - but we expected Command Complete Read Local Version Information
2462     // hang...
2463     //
2464     // Fix: Command Complete for HCI Reset in HCI_INIT_W4_SEND_READ_LOCAL_VERSION_INFORMATION trigger resend
2465     if (!command_completed
2466             && (hci_event_packet_get_type(packet) == HCI_EVENT_COMMAND_COMPLETE)
2467             && (hci_stack->substate == HCI_INIT_W4_SEND_READ_LOCAL_VERSION_INFORMATION)){
2468 
2469         uint16_t opcode = little_endian_read_16(packet,3);
2470         if (opcode == hci_reset.opcode){
2471             hci_stack->substate = HCI_INIT_SEND_READ_LOCAL_VERSION_INFORMATION;
2472             return;
2473         }
2474     }
2475 
2476     // CSR & H5
2477     // Fix: Command Complete for HCI Reset in HCI_INIT_W4_SEND_READ_LOCAL_VERSION_INFORMATION trigger resend
2478     if (!command_completed
2479             && (hci_event_packet_get_type(packet) == HCI_EVENT_COMMAND_COMPLETE)
2480             && (hci_stack->substate == HCI_INIT_W4_READ_LOCAL_SUPPORTED_COMMANDS)){
2481 
2482         uint16_t opcode = little_endian_read_16(packet,3);
2483         if (opcode == hci_reset.opcode){
2484             hci_stack->substate = HCI_INIT_READ_LOCAL_SUPPORTED_COMMANDS;
2485             return;
2486         }
2487     }
2488 
2489     // on CSR with BCSP/H5, the reset resend timeout leads to substate == HCI_INIT_SEND_RESET or HCI_INIT_SEND_RESET_CSR_WARM_BOOT
2490     // fix: Correct substate and behave as command below
2491     if (command_completed){
2492         switch (hci_stack->substate){
2493             case HCI_INIT_SEND_RESET:
2494                 hci_stack->substate = HCI_INIT_W4_SEND_RESET;
2495                 break;
2496             case HCI_INIT_SEND_RESET_CSR_WARM_BOOT:
2497                 hci_stack->substate = HCI_INIT_W4_CUSTOM_INIT_CSR_WARM_BOOT;
2498                 break;
2499             default:
2500                 break;
2501         }
2502     }
2503 
2504 #endif
2505 
2506     if (!command_completed) return;
2507 
2508     bool need_baud_change = false;
2509     bool need_addr_change = false;
2510 
2511 #ifndef HAVE_HOST_CONTROLLER_API
2512     need_baud_change = hci_stack->config
2513                         && hci_stack->chipset
2514                         && hci_stack->chipset->set_baudrate_command
2515                         && hci_stack->hci_transport->set_baudrate
2516                         && ((hci_transport_config_uart_t *)hci_stack->config)->baudrate_main;
2517 
2518     need_addr_change = hci_stack->custom_bd_addr_set
2519                         && hci_stack->chipset
2520                         && hci_stack->chipset->set_bd_addr_command;
2521 #endif
2522 
2523     switch(hci_stack->substate){
2524 
2525 #ifndef HAVE_HOST_CONTROLLER_API
2526         case HCI_INIT_SEND_RESET:
2527             // on CSR with BCSP/H5, resend triggers resend of HCI Reset and leads to substate == HCI_INIT_SEND_RESET
2528             // fix: just correct substate and behave as command below
2529 
2530             /* fall through */
2531 #endif
2532 
2533         case HCI_INIT_W4_SEND_RESET:
2534             btstack_run_loop_remove_timer(&hci_stack->timeout);
2535             hci_stack->substate = HCI_INIT_SEND_READ_LOCAL_VERSION_INFORMATION;
2536             return;
2537 
2538 #ifndef HAVE_HOST_CONTROLLER_API
2539         case HCI_INIT_W4_SEND_BAUD_CHANGE:
2540             // for STLC2500D, baud rate change already happened.
2541             // for others, baud rate gets changed now
2542             if ((hci_stack->manufacturer != BLUETOOTH_COMPANY_ID_ST_MICROELECTRONICS) && need_baud_change){
2543                 uint32_t baud_rate = hci_transport_uart_get_main_baud_rate();
2544                 log_info("Local baud rate change to %" PRIu32 "(w4_send_baud_change)", baud_rate);
2545                 hci_stack->hci_transport->set_baudrate(baud_rate);
2546             }
2547             hci_stack->substate = HCI_INIT_CUSTOM_INIT;
2548             return;
2549         case HCI_INIT_W4_CUSTOM_INIT_CSR_WARM_BOOT:
2550             btstack_run_loop_remove_timer(&hci_stack->timeout);
2551             hci_stack->substate = HCI_INIT_CUSTOM_INIT;
2552             return;
2553         case HCI_INIT_W4_CUSTOM_INIT:
2554             // repeat custom init
2555             hci_stack->substate = HCI_INIT_CUSTOM_INIT;
2556             return;
2557         case HCI_INIT_W4_CUSTOM_PRE_INIT:
2558             // repeat custom init
2559             hci_stack->substate = HCI_INIT_CUSTOM_PRE_INIT;
2560             return;
2561 #endif
2562 
2563         case HCI_INIT_W4_READ_LOCAL_SUPPORTED_COMMANDS:
2564             if (need_baud_change && (hci_stack->chipset_result != BTSTACK_CHIPSET_NO_INIT_SCRIPT) &&
2565               ((hci_stack->manufacturer == BLUETOOTH_COMPANY_ID_BROADCOM_CORPORATION) ||
2566                (hci_stack->manufacturer == BLUETOOTH_COMPANY_ID_EM_MICROELECTRONIC_MARIN_SA))) {
2567                 hci_stack->substate = HCI_INIT_SEND_BAUD_CHANGE_BCM;
2568                 return;
2569             }
2570             if (need_addr_change){
2571                 hci_stack->substate = HCI_INIT_SET_BD_ADDR;
2572                 return;
2573             }
2574             hci_stack->substate = HCI_INIT_READ_BD_ADDR;
2575             return;
2576 #ifndef HAVE_HOST_CONTROLLER_API
2577         case HCI_INIT_W4_SEND_BAUD_CHANGE_BCM:
2578             if (need_baud_change){
2579                 uint32_t baud_rate = hci_transport_uart_get_main_baud_rate();
2580                 log_info("Local baud rate change to %" PRIu32 "(w4_send_baud_change_bcm))", baud_rate);
2581                 hci_stack->hci_transport->set_baudrate(baud_rate);
2582             }
2583             if (need_addr_change){
2584                 hci_stack->substate = HCI_INIT_SET_BD_ADDR;
2585                 return;
2586             }
2587             hci_stack->substate = HCI_INIT_READ_BD_ADDR;
2588             return;
2589         case HCI_INIT_W4_SET_BD_ADDR:
2590             // for STLC2500D + ATWILC3000, bd addr change only gets active after sending reset command
2591             if ((hci_stack->manufacturer == BLUETOOTH_COMPANY_ID_ST_MICROELECTRONICS)
2592             ||  (hci_stack->manufacturer == BLUETOOTH_COMPANY_ID_ATMEL_CORPORATION)){
2593                 hci_stack->substate = HCI_INIT_SEND_RESET_ST_WARM_BOOT;
2594                 return;
2595             }
2596             // skipping st warm boot
2597             hci_stack->substate = HCI_INIT_READ_BD_ADDR;
2598             return;
2599         case HCI_INIT_W4_SEND_RESET_ST_WARM_BOOT:
2600             hci_stack->substate = HCI_INIT_READ_BD_ADDR;
2601             return;
2602 #endif
2603 
2604         case HCI_INIT_DONE:
2605             // set state if we came here by fall through
2606             hci_stack->substate = HCI_INIT_DONE;
2607             return;
2608 
2609         default:
2610             break;
2611     }
2612     hci_initializing_next_state();
2613 }
2614 
2615 static void hci_handle_connection_failed(hci_connection_t * conn, uint8_t status){
2616     // CC2564C might emit Connection Complete for rejected incoming SCO connection
2617     // To prevent accidentally freeing the HCI connection for the ACL connection,
2618     // check if we have been aware of the HCI connection
2619     switch (conn->state){
2620         case SENT_CREATE_CONNECTION:
2621         case RECEIVED_CONNECTION_REQUEST:
2622         case ACCEPTED_CONNECTION_REQUEST:
2623             break;
2624         default:
2625             return;
2626     }
2627 
2628     log_info("Outgoing connection to %s failed", bd_addr_to_str(conn->address));
2629     bd_addr_t bd_address;
2630     (void)memcpy(&bd_address, conn->address, 6);
2631 
2632 #ifdef ENABLE_CLASSIC
2633     // cache needed data
2634     int notify_dedicated_bonding_failed = conn->bonding_flags & BONDING_DEDICATED;
2635 #endif
2636 
2637     // connection failed, remove entry
2638     btstack_linked_list_remove(&hci_stack->connections, (btstack_linked_item_t *) conn);
2639     btstack_memory_hci_connection_free( conn );
2640 
2641 #ifdef ENABLE_CLASSIC
2642     // notify client if dedicated bonding
2643     if (notify_dedicated_bonding_failed){
2644         log_info("hci notify_dedicated_bonding_failed");
2645         hci_emit_dedicated_bonding_result(bd_address, status);
2646     }
2647 
2648     // if authentication error, also delete link key
2649     if (status == ERROR_CODE_AUTHENTICATION_FAILURE) {
2650         gap_drop_link_key_for_bd_addr(bd_address);
2651     }
2652 #else
2653     UNUSED(status);
2654 #endif
2655 }
2656 
2657 #ifdef ENABLE_CLASSIC
2658 static void hci_handle_remote_features_page_0(hci_connection_t * conn, const uint8_t * features){
2659     // SSP Controller
2660     if (features[6] & (1 << 3)){
2661         conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP_CONTROLLER;
2662     }
2663     // eSCO
2664     if (features[3] & (1<<7)){
2665         conn->remote_supported_features[0] |= 1;
2666     }
2667     // Extended features
2668     if (features[7] & (1<<7)){
2669         conn->remote_supported_features[0] |= 2;
2670     }
2671     // SCO packet types
2672     conn->remote_supported_sco_packets = hci_sco_packet_types_for_features(features);
2673 }
2674 
2675 static void hci_handle_remote_features_page_1(hci_connection_t * conn, const uint8_t * features){
2676     // SSP Host
2677     if (features[0] & (1 << 0)){
2678         conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP_HOST;
2679     }
2680     // SC Host
2681     if (features[0] & (1 << 3)){
2682         conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SC_HOST;
2683     }
2684 }
2685 
2686 static void hci_handle_remote_features_page_2(hci_connection_t * conn, const uint8_t * features){
2687     // SC Controller
2688     if (features[1] & (1 << 0)){
2689         conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SC_CONTROLLER;
2690     }
2691 }
2692 
2693 static void hci_handle_remote_features_received(hci_connection_t * conn){
2694     conn->bonding_flags &= ~BONDING_REMOTE_FEATURES_QUERY_ACTIVE;
2695     conn->bonding_flags |= BONDING_RECEIVED_REMOTE_FEATURES;
2696     log_info("Remote features %02x, bonding flags %" PRIx32, conn->remote_supported_features[0], conn->bonding_flags);
2697     if (conn->bonding_flags & BONDING_DEDICATED){
2698         conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST;
2699     }
2700 }
2701 static bool hci_remote_sc_enabled(hci_connection_t * connection){
2702     const uint16_t sc_enabled_mask = BONDING_REMOTE_SUPPORTS_SC_HOST | BONDING_REMOTE_SUPPORTS_SC_CONTROLLER;
2703     return (connection->bonding_flags & sc_enabled_mask) == sc_enabled_mask;
2704 }
2705 
2706 #endif
2707 
2708 static void handle_event_for_current_stack_state(const uint8_t * packet, uint16_t size) {
2709     // handle BT initialization
2710     if (hci_stack->state == HCI_STATE_INITIALIZING) {
2711         hci_initializing_event_handler(packet, size);
2712     }
2713 
2714     // help with BT sleep
2715     if ((hci_stack->state == HCI_STATE_FALLING_ASLEEP)
2716         && (hci_stack->substate == HCI_FALLING_ASLEEP_W4_WRITE_SCAN_ENABLE)
2717         && (hci_event_packet_get_type(packet) == HCI_EVENT_COMMAND_COMPLETE)
2718         && (hci_event_command_complete_get_command_opcode(packet) == HCI_OPCODE_HCI_WRITE_SCAN_ENABLE)){
2719         hci_initializing_next_state();
2720     }
2721 }
2722 
2723 #ifdef ENABLE_CLASSIC
2724 static void hci_handle_mutual_authentication_completed(hci_connection_t * conn){
2725     // bonding complete if connection is authenticated (either initiated or BR/EDR SC)
2726     conn->requested_security_level = LEVEL_0;
2727     gap_security_level_t security_level = gap_security_level_for_connection(conn);
2728     hci_emit_security_level(conn->con_handle, security_level);
2729 
2730     // dedicated bonding
2731     if ((conn->bonding_flags & BONDING_DEDICATED) != 0){
2732         conn->bonding_flags &= ~BONDING_DEDICATED;
2733         conn->bonding_status = security_level == 0 ? ERROR_CODE_INSUFFICIENT_SECURITY : ERROR_CODE_SUCCESS;
2734 #ifdef ENABLE_EXPLICIT_DEDICATED_BONDING_DISCONNECT
2735         // emit dedicated bonding complete, don't disconnect
2736         hci_emit_dedicated_bonding_result(conn->address, conn->bonding_status);
2737 #else
2738         // request disconnect, event is emitted after disconnect
2739         conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE;
2740 #endif
2741     }
2742 }
2743 
2744 static void hci_handle_read_encryption_key_size_complete(hci_connection_t * conn, uint8_t encryption_key_size) {
2745     conn->authentication_flags |= AUTH_FLAG_CONNECTION_ENCRYPTED;
2746     conn->encryption_key_size = encryption_key_size;
2747 
2748     // mutual authentication complete if authenticated and we have retrieved the encryption key size
2749     if ((conn->authentication_flags & AUTH_FLAG_CONNECTION_AUTHENTICATED) != 0) {
2750         hci_handle_mutual_authentication_completed(conn);
2751     } else {
2752         // otherwise trigger remote feature request and send authentication request
2753         hci_trigger_remote_features_for_connection(conn);
2754         if ((conn->bonding_flags & BONDING_SENT_AUTHENTICATE_REQUEST) == 0) {
2755             conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST;
2756         }
2757     }
2758 }
2759 #endif
2760 
2761 static void hci_store_local_supported_commands(const uint8_t * packet){
2762     // create mapping table
2763 #define X(name, offset, bit) { offset, bit },
2764     static struct {
2765         uint8_t byte_offset;
2766         uint8_t bit_position;
2767     } supported_hci_commands_map [] = {
2768         SUPPORTED_HCI_COMMANDS
2769     };
2770 #undef X
2771 
2772     // create names for debug purposes
2773 #ifdef ENABLE_LOG_DEBUG
2774 #define X(name, offset, bit) #name,
2775     static const char * command_names[] = {
2776         SUPPORTED_HCI_COMMANDS
2777     };
2778 #undef X
2779 #endif
2780 
2781     hci_stack->local_supported_commands = 0;
2782     const uint8_t * commands_map = &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1];
2783     uint16_t i;
2784     for (i = 0 ; i < SUPPORTED_HCI_COMMANDS_COUNT ; i++){
2785         if ((commands_map[supported_hci_commands_map[i].byte_offset] & (1 << supported_hci_commands_map[i].bit_position)) != 0){
2786 #ifdef ENABLE_LOG_DEBUG
2787             log_info("Command %s (%u) supported %u/%u", command_names[i], i, supported_hci_commands_map[i].byte_offset, supported_hci_commands_map[i].bit_position);
2788 #else
2789             log_info("Command 0x%02x supported %u/%u", i, supported_hci_commands_map[i].byte_offset, supported_hci_commands_map[i].bit_position);
2790 #endif
2791             hci_stack->local_supported_commands |= (1LU << i);
2792         }
2793     }
2794     log_info("Local supported commands summary %08" PRIx32, hci_stack->local_supported_commands);
2795 }
2796 
2797 static void handle_command_complete_event(uint8_t * packet, uint16_t size){
2798     UNUSED(size);
2799 
2800     uint8_t status = 0;
2801     if( size > OFFSET_OF_DATA_IN_COMMAND_COMPLETE ) {
2802         status = hci_event_command_complete_get_return_parameters(packet)[0];
2803     }
2804     uint16_t manufacturer;
2805 #ifdef ENABLE_CLASSIC
2806     hci_connection_t * conn;
2807 #endif
2808 #if defined(ENABLE_CLASSIC) || (defined(ENABLE_BLE) && defined(ENABLE_LE_ISOCHRONOUS_STREAMS))
2809     hci_con_handle_t handle;
2810 #endif
2811 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
2812     le_audio_cig_t * cig;
2813 #endif
2814 #if defined(ENABLE_BLE) && defined(ENABLE_HCI_COMMAND_STATUS_DISCARDED_FOR_FAILED_CONNECTIONS_WORKAROUND)
2815     hci_stack->hci_command_con_handle = HCI_CON_HANDLE_INVALID;
2816 #endif
2817 
2818     // get num cmd packets - limit to 1 to reduce complexity
2819     hci_stack->num_cmd_packets = packet[2] ? 1 : 0;
2820 
2821     uint16_t opcode = hci_event_command_complete_get_command_opcode(packet);
2822     switch (opcode){
2823         case HCI_OPCODE_HCI_READ_LOCAL_NAME:
2824             if (status) break;
2825             // terminate, name 248 chars
2826             packet[6+248] = 0;
2827             log_info("local name: %s", &packet[6]);
2828             break;
2829         case HCI_OPCODE_HCI_READ_BUFFER_SIZE:
2830             // "The HC_ACL_Data_Packet_Length return parameter will be used to determine the size of the L2CAP segments contained in ACL Data Packets"
2831             if (hci_stack->state == HCI_STATE_INITIALIZING) {
2832                 uint16_t acl_len = little_endian_read_16(packet, 6);
2833                 uint16_t sco_len = packet[8];
2834 
2835                 // determine usable ACL/SCO payload size
2836                 hci_stack->acl_data_packet_length = btstack_min(acl_len, HCI_ACL_PAYLOAD_SIZE);
2837                 hci_stack->sco_data_packet_length = btstack_min(sco_len, HCI_ACL_PAYLOAD_SIZE);
2838 
2839                 hci_stack->acl_packets_total_num = (uint8_t) btstack_min(little_endian_read_16(packet,  9), MAX_NR_CONTROLLER_ACL_BUFFERS);
2840                 hci_stack->sco_packets_total_num = (uint8_t) btstack_min(little_endian_read_16(packet, 11), MAX_NR_CONTROLLER_SCO_PACKETS);
2841 
2842                 log_info("hci_read_buffer_size: ACL size module %u -> used %u, count %u / SCO size %u, count %u",
2843                          acl_len, hci_stack->acl_data_packet_length, hci_stack->acl_packets_total_num,
2844                          hci_stack->sco_data_packet_length, hci_stack->sco_packets_total_num);
2845             }
2846             break;
2847         case HCI_OPCODE_HCI_READ_RSSI:
2848             if (status == ERROR_CODE_SUCCESS){
2849                 uint8_t event[5];
2850                 event[0] = GAP_EVENT_RSSI_MEASUREMENT;
2851                 event[1] = 3;
2852                 (void)memcpy(&event[2], &packet[6], 3);
2853                 hci_emit_btstack_event(event, sizeof(event), 1);
2854             }
2855             break;
2856 #ifdef ENABLE_BLE
2857         case HCI_OPCODE_HCI_LE_READ_BUFFER_SIZE_V2:
2858             hci_stack->le_iso_packets_length = little_endian_read_16(packet, 9);
2859             hci_stack->le_iso_packets_total_num = packet[11];
2860             log_info("hci_le_read_buffer_size_v2: iso size %u, iso count %u",
2861                      hci_stack->le_iso_packets_length, hci_stack->le_iso_packets_total_num);
2862 
2863             /* fall through */
2864 
2865         case HCI_OPCODE_HCI_LE_READ_BUFFER_SIZE:
2866             hci_stack->le_data_packets_length = little_endian_read_16(packet, 6);
2867             hci_stack->le_acl_packets_total_num = packet[8];
2868             // determine usable ACL payload size
2869             if (HCI_ACL_PAYLOAD_SIZE < hci_stack->le_data_packets_length){
2870                 hci_stack->le_data_packets_length = HCI_ACL_PAYLOAD_SIZE;
2871             }
2872             log_info("hci_le_read_buffer_size: acl size %u, acl count %u", hci_stack->le_data_packets_length, hci_stack->le_acl_packets_total_num);
2873             break;
2874 #endif
2875 #ifdef ENABLE_LE_DATA_LENGTH_EXTENSION
2876         case HCI_OPCODE_HCI_LE_READ_MAXIMUM_DATA_LENGTH:
2877             hci_stack->le_supported_max_tx_octets = little_endian_read_16(packet, 6);
2878             hci_stack->le_supported_max_tx_time = little_endian_read_16(packet, 8);
2879             log_info("hci_le_read_maximum_data_length: tx octets %u, tx time %u us", hci_stack->le_supported_max_tx_octets, hci_stack->le_supported_max_tx_time);
2880             break;
2881 #endif
2882 #ifdef ENABLE_LE_CENTRAL
2883         case HCI_OPCODE_HCI_LE_READ_WHITE_LIST_SIZE:
2884             hci_stack->le_whitelist_capacity = packet[6];
2885             log_info("hci_le_read_white_list_size: size %u", hci_stack->le_whitelist_capacity);
2886             break;
2887 #endif
2888 #ifdef ENABLE_LE_PERIPHERAL
2889 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
2890         case HCI_OPCODE_HCI_LE_READ_MAXIMUM_ADVERTISING_DATA_LENGTH:
2891             hci_stack->le_maximum_advertising_data_length = little_endian_read_16(packet, 6);
2892             break;
2893         case HCI_OPCODE_HCI_LE_SET_EXTENDED_ADVERTISING_PARAMETERS:
2894             if (hci_stack->le_advertising_set_in_current_command != 0) {
2895                 le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(hci_stack->le_advertising_set_in_current_command);
2896                 hci_stack->le_advertising_set_in_current_command = 0;
2897                 if (advertising_set == NULL) break;
2898                 uint8_t adv_status = packet[6];
2899                 uint8_t tx_power   = packet[7];
2900                 uint8_t event[] = { HCI_EVENT_META_GAP, 4, GAP_SUBEVENT_ADVERTISING_SET_INSTALLED, hci_stack->le_advertising_set_in_current_command, adv_status, tx_power };
2901                 if (adv_status == 0){
2902                     advertising_set->state |= LE_ADVERTISEMENT_STATE_PARAMS_SET;
2903                 }
2904                 hci_emit_btstack_event(event, sizeof(event), 1);
2905             }
2906             break;
2907         case HCI_OPCODE_HCI_LE_REMOVE_ADVERTISING_SET:
2908             if (hci_stack->le_advertising_set_in_current_command != 0) {
2909                 le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(hci_stack->le_advertising_set_in_current_command);
2910                 hci_stack->le_advertising_set_in_current_command = 0;
2911                 if (advertising_set == NULL) break;
2912                 uint8_t event[] = { HCI_EVENT_META_GAP, 3, GAP_SUBEVENT_ADVERTISING_SET_REMOVED, hci_stack->le_advertising_set_in_current_command, status };
2913                 if (status == 0){
2914                     btstack_linked_list_remove(&hci_stack->le_advertising_sets, (btstack_linked_item_t *) advertising_set);
2915                 }
2916                 hci_emit_btstack_event(event, sizeof(event), 1);
2917             }
2918             break;
2919 #endif
2920 #endif
2921         case HCI_OPCODE_HCI_READ_BD_ADDR:
2922             reverse_bd_addr(&packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1], hci_stack->local_bd_addr);
2923             log_info("Local Address, Status: 0x%02x: Addr: %s", status, bd_addr_to_str(hci_stack->local_bd_addr));
2924 #ifdef ENABLE_CLASSIC
2925             if (hci_stack->link_key_db){
2926                 hci_stack->link_key_db->set_local_bd_addr(hci_stack->local_bd_addr);
2927             }
2928 #endif
2929             break;
2930 #ifdef ENABLE_CLASSIC
2931         case HCI_OPCODE_HCI_WRITE_SCAN_ENABLE:
2932             hci_emit_scan_mode_changed(hci_stack->discoverable, hci_stack->connectable);
2933             break;
2934         case HCI_OPCODE_HCI_PERIODIC_INQUIRY_MODE:
2935             if (status == ERROR_CODE_SUCCESS) {
2936                 hci_stack->inquiry_state = GAP_INQUIRY_STATE_PERIODIC;
2937             } else {
2938                 hci_stack->inquiry_state = GAP_INQUIRY_STATE_IDLE;
2939             }
2940             break;
2941         case HCI_OPCODE_HCI_INQUIRY_CANCEL:
2942         case HCI_OPCODE_HCI_EXIT_PERIODIC_INQUIRY_MODE:
2943             if (hci_stack->inquiry_state == GAP_INQUIRY_STATE_W4_CANCELLED){
2944                 hci_stack->inquiry_state = GAP_INQUIRY_STATE_IDLE;
2945                 uint8_t event[] = { GAP_EVENT_INQUIRY_COMPLETE, 1, 0};
2946                 hci_emit_btstack_event(event, sizeof(event), 1);
2947             }
2948             break;
2949 #endif
2950         case HCI_OPCODE_HCI_READ_LOCAL_SUPPORTED_FEATURES:
2951             (void)memcpy(hci_stack->local_supported_features, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1], 8);
2952 
2953 #ifdef ENABLE_CLASSIC
2954             // determine usable ACL packet types based on host buffer size and supported features
2955             hci_stack->usable_packet_types_acl = hci_acl_packet_types_for_buffer_size_and_local_features(HCI_ACL_PAYLOAD_SIZE, &hci_stack->local_supported_features[0]);
2956             log_info("ACL Packet types %04x", hci_stack->usable_packet_types_acl);
2957             // determine usable SCO packet types based on supported features
2958             hci_stack->usable_packet_types_sco = hci_sco_packet_types_for_features(
2959                     &hci_stack->local_supported_features[0]);
2960             log_info("SCO Packet types %04x - eSCO %u", hci_stack->usable_packet_types_sco, hci_extended_sco_link_supported());
2961 #endif
2962             // Classic/LE
2963             log_info("BR/EDR support %u, LE support %u", hci_classic_supported(), hci_le_supported());
2964             break;
2965         case HCI_OPCODE_HCI_READ_LOCAL_VERSION_INFORMATION:
2966             manufacturer = little_endian_read_16(packet, 10);
2967             // map Cypress & Infineon to Broadcom
2968             switch (manufacturer){
2969                 case BLUETOOTH_COMPANY_ID_CYPRESS_SEMICONDUCTOR:
2970                 case BLUETOOTH_COMPANY_ID_INFINEON_TECHNOLOGIES_AG:
2971                     log_info("Treat Cypress/Infineon as Broadcom");
2972                     manufacturer = BLUETOOTH_COMPANY_ID_BROADCOM_CORPORATION;
2973                     little_endian_store_16(packet, 10, manufacturer);
2974                     break;
2975                 default:
2976                     break;
2977             }
2978             hci_stack->manufacturer = manufacturer;
2979             log_info("Manufacturer: 0x%04x", hci_stack->manufacturer);
2980             break;
2981         case HCI_OPCODE_HCI_READ_LOCAL_SUPPORTED_COMMANDS:
2982             hci_store_local_supported_commands(packet);
2983             break;
2984 #ifdef ENABLE_CLASSIC
2985         case HCI_OPCODE_HCI_WRITE_SYNCHRONOUS_FLOW_CONTROL_ENABLE:
2986             if (status) return;
2987             hci_stack->synchronous_flow_control_enabled = 1;
2988             break;
2989         case HCI_OPCODE_HCI_READ_ENCRYPTION_KEY_SIZE:
2990             handle = little_endian_read_16(packet, OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1);
2991             conn   = hci_connection_for_handle(handle);
2992             if (conn != NULL) {
2993                 uint8_t key_size = 0;
2994                 if (status == 0){
2995                     key_size = packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+3];
2996                     log_info("Handle %04x key Size: %u", handle, key_size);
2997                 } else {
2998                     key_size = 1;
2999                     log_info("Read Encryption Key Size failed 0x%02x-> assuming insecure connection with key size of 1", status);
3000                 }
3001                 hci_handle_read_encryption_key_size_complete(conn, key_size);
3002             }
3003             break;
3004         // assert pairing complete event is emitted.
3005         // note: for SSP, Simple Pairing Complete Event is sufficient, but we want to be more robust
3006         case HCI_OPCODE_HCI_PIN_CODE_REQUEST_NEGATIVE_REPLY:
3007         case HCI_OPCODE_HCI_USER_PASSKEY_REQUEST_NEGATIVE_REPLY:
3008         case HCI_OPCODE_HCI_USER_CONFIRMATION_REQUEST_NEGATIVE_REPLY:
3009             hci_stack->gap_pairing_state = GAP_PAIRING_STATE_IDLE;
3010             // lookup connection by gap pairing addr
3011             conn = hci_connection_for_bd_addr_and_type(hci_stack->gap_pairing_addr, BD_ADDR_TYPE_ACL);
3012             if (conn == NULL) break;
3013             hci_pairing_complete(conn, ERROR_CODE_AUTHENTICATION_FAILURE);
3014             break;
3015 
3016 #ifdef ENABLE_CLASSIC_PAIRING_OOB
3017         case HCI_OPCODE_HCI_READ_LOCAL_OOB_DATA:
3018         case HCI_OPCODE_HCI_READ_LOCAL_EXTENDED_OOB_DATA:{
3019             uint8_t event[67];
3020             event[0] = GAP_EVENT_LOCAL_OOB_DATA;
3021             event[1] = 65;
3022             (void)memset(&event[2], 0, 65);
3023             if (status == ERROR_CODE_SUCCESS){
3024                 (void)memcpy(&event[3], &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1], 32);
3025                 if (opcode == HCI_OPCODE_HCI_READ_LOCAL_EXTENDED_OOB_DATA){
3026                     event[2] = 3;
3027                     (void)memcpy(&event[35], &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+33], 32);
3028                 } else {
3029                     event[2] = 1;
3030                 }
3031             }
3032             hci_emit_btstack_event(event, sizeof(event), 0);
3033             break;
3034         }
3035 
3036         // note: only needed if user does not provide OOB data
3037         case HCI_OPCODE_HCI_REMOTE_OOB_DATA_REQUEST_NEGATIVE_REPLY:
3038             conn = hci_connection_for_handle(hci_stack->classic_oob_con_handle);
3039             hci_stack->classic_oob_con_handle = HCI_CON_HANDLE_INVALID;
3040             if (conn == NULL) break;
3041             hci_pairing_complete(conn, ERROR_CODE_AUTHENTICATION_FAILURE);
3042             break;
3043 #endif
3044 #endif
3045 #ifdef ENABLE_BLE
3046 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
3047         case HCI_OPCODE_HCI_LE_SET_CIG_PARAMETERS:
3048             // lookup CIG
3049             cig = hci_cig_for_id(hci_stack->iso_active_operation_group_id);
3050             if (cig != NULL){
3051                 uint8_t i = 0;
3052                 if (status == ERROR_CODE_SUCCESS){
3053                     // assign CIS handles to pre-allocated CIS
3054                     btstack_linked_list_iterator_t it;
3055                     btstack_linked_list_iterator_init(&it, &hci_stack->iso_streams);
3056                     while (btstack_linked_list_iterator_has_next(&it) && (i < cig->num_cis)) {
3057                         hci_iso_stream_t *iso_stream = (hci_iso_stream_t *) btstack_linked_list_iterator_next(&it);
3058                         if ((iso_stream->group_id == hci_stack->iso_active_operation_group_id) &&
3059                             (iso_stream->iso_type == HCI_ISO_TYPE_CIS)){
3060                             hci_con_handle_t cis_handle = little_endian_read_16(packet, OFFSET_OF_DATA_IN_COMMAND_COMPLETE+3+(2*i));
3061                             iso_stream->cis_handle  = cis_handle;
3062                             cig->cis_con_handles[i] = cis_handle;
3063                             i++;
3064                         }
3065                     }
3066                     cig->state = LE_AUDIO_CIG_STATE_W4_CIS_REQUEST;
3067                     hci_emit_cig_created(cig, status);
3068                 } else {
3069                     hci_emit_cig_created(cig, status);
3070                     btstack_linked_list_remove(&hci_stack->le_audio_cigs, (btstack_linked_item_t *) cig);
3071                 }
3072             }
3073             hci_stack->iso_active_operation_type = HCI_ISO_TYPE_INVALID;
3074             break;
3075         case HCI_OPCODE_HCI_LE_CREATE_CIS:
3076             if (status != ERROR_CODE_SUCCESS){
3077                 hci_iso_stream_requested_finalize(HCI_ISO_GROUP_ID_INVALID);
3078             }
3079             break;
3080         case HCI_OPCODE_HCI_LE_ACCEPT_CIS_REQUEST:
3081             if (status != ERROR_CODE_SUCCESS){
3082                 hci_iso_stream_requested_finalize(HCI_ISO_GROUP_ID_INVALID);
3083             }
3084             break;
3085         case HCI_OPCODE_HCI_LE_SETUP_ISO_DATA_PATH: {
3086             // lookup BIG by state
3087             btstack_linked_list_iterator_t it;
3088             btstack_linked_list_iterator_init(&it, &hci_stack->le_audio_bigs);
3089             while (btstack_linked_list_iterator_has_next(&it)) {
3090                 le_audio_big_t *big = (le_audio_big_t *) btstack_linked_list_iterator_next(&it);
3091                 if (big->state == LE_AUDIO_BIG_STATE_W4_SETUP_ISO_PATH){
3092                     if (status == ERROR_CODE_SUCCESS){
3093                         big->state_vars.next_bis++;
3094                         if (big->state_vars.next_bis == big->num_bis){
3095                             big->state = LE_AUDIO_BIG_STATE_ACTIVE;
3096                             hci_emit_big_created(big, ERROR_CODE_SUCCESS);
3097                         } else {
3098                             big->state = LE_AUDIO_BIG_STATE_SETUP_ISO_PATH;
3099                         }
3100                     } else {
3101                         big->state = LE_AUDIO_BIG_STATE_SETUP_ISO_PATHS_FAILED;
3102                         big->state_vars.status = status;
3103                     }
3104                     return;
3105                 }
3106             }
3107             btstack_linked_list_iterator_init(&it, &hci_stack->le_audio_big_syncs);
3108             while (btstack_linked_list_iterator_has_next(&it)) {
3109                 le_audio_big_sync_t *big_sync = (le_audio_big_sync_t *) btstack_linked_list_iterator_next(&it);
3110                 if (big_sync->state == LE_AUDIO_BIG_STATE_W4_SETUP_ISO_PATH){
3111                     if (status == ERROR_CODE_SUCCESS){
3112                         big_sync->state_vars.next_bis++;
3113                         if (big_sync->state_vars.next_bis == big_sync->num_bis){
3114                             big_sync->state = LE_AUDIO_BIG_STATE_ACTIVE;
3115                             hci_emit_big_sync_created(big_sync, ERROR_CODE_SUCCESS);
3116                         } else {
3117                             big_sync->state = LE_AUDIO_BIG_STATE_SETUP_ISO_PATH;
3118                         }
3119                     } else {
3120                         big_sync->state = LE_AUDIO_BIG_STATE_SETUP_ISO_PATHS_FAILED;
3121                         big_sync->state_vars.status = status;
3122                     }
3123                     return;
3124                 }
3125             }
3126             // Lookup CIS via active group operation
3127             if (hci_stack->iso_active_operation_type == HCI_ISO_TYPE_CIS){
3128                 if (hci_stack->iso_active_operation_group_id == HCI_ISO_GROUP_ID_SINGLE_CIS){
3129                     hci_stack->iso_active_operation_type = HCI_ISO_TYPE_INVALID;
3130 
3131                     // lookup CIS by state
3132                     btstack_linked_list_iterator_init(&it, &hci_stack->iso_streams);
3133                     while (btstack_linked_list_iterator_has_next(&it)){
3134                         hci_iso_stream_t * iso_stream = (hci_iso_stream_t *) btstack_linked_list_iterator_next(&it);
3135                         handle = iso_stream->cis_handle;
3136                         bool emit_cis_created = false;
3137                         switch (iso_stream->state){
3138                             case HCI_ISO_STREAM_STATE_W4_ISO_SETUP_INPUT:
3139                                 if (status != ERROR_CODE_SUCCESS){
3140                                     emit_cis_created = true;
3141                                     break;
3142                                 }
3143                                 if (iso_stream->max_sdu_c_to_p > 0){
3144                                     iso_stream->state = HCI_ISO_STREAM_STATE_W2_SETUP_ISO_OUTPUT;
3145                                 } else {
3146                                     emit_cis_created = true;
3147                                 }
3148                                 break;
3149                             case HCI_ISO_STREAM_STATE_W4_ISO_SETUP_OUTPUT:
3150                                 emit_cis_created = true;
3151                                 break;
3152                             default:
3153                                 break;
3154                         }
3155                         if (emit_cis_created){
3156                             hci_cis_handle_created(iso_stream, status);
3157                         }
3158                     }
3159                 } else {
3160                     cig = hci_cig_for_id(hci_stack->iso_active_operation_group_id);
3161                     hci_stack->iso_active_operation_type = HCI_ISO_TYPE_INVALID;
3162                     if (cig != NULL) {
3163                         // emit cis created if all ISO Paths have been created
3164                         // assume we are central
3165                         uint8_t cis_index     = cig->state_vars.next_cis >> 1;
3166                         uint8_t cis_direction = cig->state_vars.next_cis & 1;
3167                         bool outgoing_needed  = cig->params->cis_params[cis_index].max_sdu_p_to_c > 0;
3168                         // if outgoing has been setup, or incoming was setup but outgoing not required
3169                         if ((cis_direction == 1) || (outgoing_needed == false)){
3170                             // lookup iso stream by cig/cis
3171                             btstack_linked_list_iterator_init(&it, &hci_stack->iso_streams);
3172                             while (btstack_linked_list_iterator_has_next(&it)) {
3173                                 hci_iso_stream_t *iso_stream = (hci_iso_stream_t *) btstack_linked_list_iterator_next(&it);
3174                                 if ((iso_stream->group_id == cig->cig_id) && (iso_stream->stream_id == cis_index)){
3175                                     hci_cis_handle_created(iso_stream, status);
3176                                 }
3177                             }
3178                         }
3179                         // next state
3180                         cig->state_vars.next_cis++;
3181                         cig->state = LE_AUDIO_CIG_STATE_SETUP_ISO_PATH;
3182                     }
3183                 }
3184             }
3185             break;
3186         }
3187         case HCI_OPCODE_HCI_LE_BIG_TERMINATE_SYNC: {
3188             // lookup BIG by state
3189             btstack_linked_list_iterator_t it;
3190             btstack_linked_list_iterator_init(&it, &hci_stack->le_audio_big_syncs);
3191             while (btstack_linked_list_iterator_has_next(&it)) {
3192                 le_audio_big_sync_t *big_sync = (le_audio_big_sync_t *) btstack_linked_list_iterator_next(&it);
3193                 uint8_t big_handle = big_sync->big_handle;
3194                 switch (big_sync->state){
3195                     case LE_AUDIO_BIG_STATE_W4_TERMINATED_AFTER_SETUP_FAILED:
3196                         btstack_linked_list_iterator_remove(&it);
3197                         hci_emit_big_sync_created(big_sync, big_sync->state_vars.status);
3198                         return;
3199                     default:
3200                         btstack_linked_list_iterator_remove(&it);
3201                         hci_emit_big_sync_stopped(big_handle);
3202                         return;
3203                 }
3204             }
3205             break;
3206         }
3207 #endif
3208 #endif
3209         default:
3210             break;
3211     }
3212 }
3213 
3214 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
3215 static void
3216 hci_iso_create_big_failed(const le_audio_big_t *big, uint8_t status) {
3217     hci_iso_stream_finalize_by_type_and_group_id(HCI_ISO_TYPE_BIS, big->big_handle);
3218     btstack_linked_list_remove(&hci_stack->le_audio_bigs, (btstack_linked_item_t *) big);
3219     if (big->state == LE_AUDIO_BIG_STATE_W4_ESTABLISHED){
3220         hci_emit_big_created(big, status);
3221     } else {
3222         hci_emit_big_terminated(big);
3223     }
3224 }
3225 
3226 static void hci_iso_big_sync_failed(const le_audio_big_sync_t *big_sync, uint8_t status) {
3227     btstack_linked_list_remove(&hci_stack->le_audio_big_syncs, (btstack_linked_item_t *) big_sync);
3228     if (big_sync->state == LE_AUDIO_BIG_STATE_W4_ESTABLISHED) {
3229         hci_emit_big_sync_created(big_sync, status);
3230     } else {
3231         hci_emit_big_sync_stopped(big_sync->big_handle);
3232     }
3233 }
3234 #endif
3235 
3236 static void handle_command_status_event(uint8_t * packet, uint16_t size) {
3237     UNUSED(size);
3238 
3239     // get num cmd packets - limit to 1 to reduce complexity
3240     hci_stack->num_cmd_packets = packet[3] ? 1 : 0;
3241 
3242     // get opcode and command status
3243     uint16_t opcode = hci_event_command_status_get_command_opcode(packet);
3244 
3245 #if defined(ENABLE_CLASSIC) || defined(ENABLE_LE_CENTRAL) || defined(ENABLE_LE_ISOCHRONOUS_STREAMS)
3246     uint8_t status = hci_event_command_status_get_status(packet);
3247 #endif
3248 
3249 #if defined(ENABLE_CLASSIC) || defined(ENABLE_LE_CENTRAL)
3250     bd_addr_type_t addr_type;
3251     bd_addr_t addr;
3252 #endif
3253 
3254 #if defined(ENABLE_BLE) && defined (ENABLE_HCI_COMMAND_STATUS_DISCARDED_FOR_FAILED_CONNECTIONS_WORKAROUND)
3255     hci_stack->hci_command_con_handle = HCI_CON_HANDLE_INVALID;
3256 #endif
3257 
3258     switch (opcode){
3259 #ifdef ENABLE_CLASSIC
3260         case HCI_OPCODE_HCI_CREATE_CONNECTION:
3261         case HCI_OPCODE_HCI_SETUP_SYNCHRONOUS_CONNECTION:
3262         case HCI_OPCODE_HCI_ACCEPT_SYNCHRONOUS_CONNECTION:
3263 #endif
3264 #ifdef ENABLE_LE_CENTRAL
3265         case HCI_OPCODE_HCI_LE_CREATE_CONNECTION:
3266 #endif
3267 #if defined(ENABLE_CLASSIC) || defined(ENABLE_LE_CENTRAL)
3268             addr_type = hci_stack->outgoing_addr_type;
3269             memcpy(addr, hci_stack->outgoing_addr, 6);
3270 
3271             // reset outgoing address info
3272             memset(hci_stack->outgoing_addr, 0, 6);
3273             hci_stack->outgoing_addr_type = BD_ADDR_TYPE_UNKNOWN;
3274 
3275             // on error
3276             if (status != ERROR_CODE_SUCCESS){
3277 #ifdef ENABLE_LE_CENTRAL
3278                 if (hci_is_le_connection_type(addr_type)){
3279                     hci_stack->le_connecting_state = LE_CONNECTING_IDLE;
3280                     hci_stack->le_connecting_request = LE_CONNECTING_IDLE;
3281                 }
3282 #endif
3283                 // error => outgoing connection failed
3284                 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, addr_type);
3285                 if (conn != NULL){
3286                     hci_handle_connection_failed(conn, status);
3287                 }
3288             }
3289             break;
3290 #endif
3291 #ifdef ENABLE_CLASSIC
3292         case HCI_OPCODE_HCI_INQUIRY:
3293             if (status == ERROR_CODE_SUCCESS) {
3294                 hci_stack->inquiry_state = GAP_INQUIRY_STATE_ACTIVE;
3295             } else {
3296                 hci_stack->inquiry_state = GAP_INQUIRY_STATE_IDLE;
3297             }
3298             break;
3299 #endif
3300 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
3301         case HCI_OPCODE_HCI_LE_CREATE_CIS:
3302         case HCI_OPCODE_HCI_LE_ACCEPT_CIS_REQUEST:
3303             if (status == ERROR_CODE_SUCCESS){
3304                 hci_iso_stream_requested_confirm(HCI_ISO_GROUP_ID_INVALID);
3305             } else {
3306                 hci_iso_stream_requested_finalize(HCI_ISO_GROUP_ID_INVALID);
3307             }
3308             break;
3309         case HCI_OPCODE_HCI_LE_CREATE_BIG:
3310             if (status != ERROR_CODE_SUCCESS){
3311                 hci_stack->iso_active_operation_type = HCI_ISO_TYPE_INVALID;
3312                 // get current big
3313                 le_audio_big_t * big = hci_big_for_handle(hci_stack->iso_active_operation_group_id);
3314                 if (big != NULL){
3315                     hci_iso_create_big_failed(big, status);
3316                 }
3317             }
3318             break;
3319         case HCI_OPCODE_HCI_LE_BIG_CREATE_SYNC:
3320             if (status != ERROR_CODE_SUCCESS){
3321                 hci_stack->iso_active_operation_type = HCI_ISO_TYPE_INVALID;
3322                 // get current big sync
3323                 le_audio_big_sync_t * big_sync = hci_big_sync_for_handle(hci_stack->iso_active_operation_group_id);
3324                 if (big_sync != NULL){
3325                     hci_iso_big_sync_failed(big_sync, status);
3326                 }
3327             }
3328             break;
3329 #endif /* ENABLE_LE_ISOCHRONOUS_STREAMS */
3330         default:
3331             break;
3332     }
3333 }
3334 
3335 #ifdef ENABLE_BLE
3336 static void hci_create_gap_connection_complete_event(const uint8_t * hci_event, uint8_t * gap_event) {
3337     gap_event[0] = HCI_EVENT_META_GAP;
3338     gap_event[1] = 36 - 2;
3339     gap_event[2] = GAP_SUBEVENT_LE_CONNECTION_COMPLETE;
3340     switch (hci_event_le_meta_get_subevent_code(hci_event)){
3341         case HCI_SUBEVENT_LE_CONNECTION_COMPLETE:
3342             memcpy(&gap_event[3], &hci_event[3], 11);
3343             memset(&gap_event[14], 0, 12);
3344             memcpy(&gap_event[26], &hci_event[14], 7);
3345             memset(&gap_event[33], 0xff, 3);
3346             break;
3347         case HCI_SUBEVENT_LE_ENHANCED_CONNECTION_COMPLETE_V1:
3348             memcpy(&gap_event[3], &hci_event[3], 30);
3349             memset(&gap_event[33], 0xff, 3);
3350             break;
3351         case HCI_SUBEVENT_LE_ENHANCED_CONNECTION_COMPLETE_V2:
3352             memcpy(&gap_event[3], &hci_event[3], 33);
3353             break;
3354         default:
3355             btstack_unreachable();
3356             break;
3357     }
3358 }
3359 
3360 static void hci_handle_le_connection_complete_event(const uint8_t * hci_event){
3361     // create GAP_SUBEVENT_LE_CONNECTION_COMPLETE
3362     uint8_t gap_event[36];
3363     hci_create_gap_connection_complete_event(hci_event, gap_event);
3364 
3365     // read fields
3366     uint8_t status = gap_subevent_le_connection_complete_get_status(gap_event);
3367     hci_role_t role = (hci_role_t) gap_subevent_le_connection_complete_get_role(gap_event);
3368     uint16_t conn_interval = gap_subevent_le_connection_complete_get_conn_interval(gap_event);
3369 
3370 	// Connection management
3371     bd_addr_t addr;
3372     gap_subevent_le_connection_complete_get_peer_address(gap_event, addr);
3373     bd_addr_type_t addr_type = (bd_addr_type_t) gap_subevent_le_connection_complete_get_peer_address_type(gap_event);
3374     hci_con_handle_t con_handle = gap_subevent_le_connection_complete_get_connection_handle(gap_event);
3375     log_info("LE Connection_complete (status=%u) type %u, %s", status, addr_type, bd_addr_to_str(addr));
3376     hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, addr_type);
3377 
3378 #ifdef ENABLE_LE_CENTRAL
3379 	// handle error: error is reported only to the initiator -> outgoing connection
3380 	if (status){
3381 
3382 		// handle cancelled outgoing connection
3383 		// "If the cancellation was successful then, after the Command Complete event for the LE_Create_Connection_Cancel command,
3384 		//  either an LE Connection Complete or an LE Enhanced Connection Complete event shall be generated.
3385 		//  In either case, the event shall be sent with the error code Unknown Connection Identifier (0x02)."
3386         bool connection_was_cancelled = false;
3387 		if (status == ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER){
3388             connection_was_cancelled = true;
3389 		    // reset state
3390             hci_stack->le_connecting_state = LE_CONNECTING_IDLE;
3391             // get outgoing connection conn struct for direct connect
3392             conn = gap_get_outgoing_le_connection();
3393             // prepare restart if still active
3394             if (hci_stack->le_connecting_request == LE_CONNECTING_DIRECT){
3395                 conn->state = SEND_CREATE_CONNECTION;
3396             }
3397 		}
3398 
3399 		// free connection if cancelled by user (request == IDLE)
3400         bool cancelled_by_user = hci_stack->le_connecting_request == LE_CONNECTING_IDLE;
3401 		if ((conn != NULL) && cancelled_by_user){
3402 			// remove entry
3403 			btstack_linked_list_remove(&hci_stack->connections, (btstack_linked_item_t *) conn);
3404 			btstack_memory_hci_connection_free( conn );
3405 		}
3406 
3407         // emit GAP_SUBEVENT_LE_CONNECTION_COMPLETE for:
3408         // - outgoing error not caused by connection cancel
3409         // - connection cancelled by user
3410         // by this, no event is emitted for intermediate connection cancel required filterlist modification
3411         if ((connection_was_cancelled == false) || cancelled_by_user){
3412             hci_emit_btstack_event(gap_event, sizeof(gap_event), 1);
3413         }
3414         return;
3415 	}
3416 #endif
3417 
3418 	// on success, both hosts receive connection complete event
3419     if (role == HCI_ROLE_MASTER){
3420 #ifdef ENABLE_LE_CENTRAL
3421 		// if we're master, it was an outgoing connection
3422 		// note: no hci_connection_t object exists yet for connect with whitelist
3423 
3424         // if an identity addresses was used without enhanced connection complete event,
3425         // the connection complete event contains the current random address of the peer device.
3426         // This random address is needed in the case of a re-pairing
3427         if (hci_event_le_meta_get_subevent_code(hci_event) == HCI_SUBEVENT_LE_CONNECTION_COMPLETE){
3428             conn = gap_get_outgoing_le_connection();
3429             // if outgoing connection object is available, check if identity address was used.
3430             // if yes, track resolved random address and provide rpa
3431             // note: we don't update hci le subevent connection complete
3432             if (conn != NULL){
3433                 if (hci_is_le_identity_address_type(conn->address_type)){
3434                     memcpy(&gap_event[20], &gap_event[8], 6);
3435                     gap_event[7] = conn->address_type;
3436                     reverse_bd_addr(conn->address, &gap_event[8]);
3437                 }
3438             }
3439         }
3440 
3441         // we're done with it
3442         hci_stack->le_connecting_state   = LE_CONNECTING_IDLE;
3443         hci_stack->le_connecting_request = LE_CONNECTING_IDLE;
3444 #endif
3445 	} else {
3446 #ifdef ENABLE_LE_PERIPHERAL
3447 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
3448         if (hci_le_extended_advertising_supported()) {
3449             // advertisement state managed with HCI_SUBEVENT_LE_ADVERTISING_SET_TERMINATED
3450 
3451             // if advertisement set terminated event arrives before connection complete, connection struct has been prepared
3452             // set missing peer address + address type
3453             conn = hci_connection_for_handle(con_handle);
3454             if (conn != NULL){
3455                 memcpy(conn->address, addr, 6);
3456                 conn->address_type = addr_type;
3457             }
3458         }
3459         else
3460 #endif
3461         {
3462             // if we're slave, it was an incoming connection and advertisements have stopped
3463             hci_stack->le_advertisements_state &= ~LE_ADVERTISEMENT_STATE_ACTIVE;
3464         }
3465 #endif
3466 	}
3467 
3468 	// LE connections are auto-accepted, so just create a connection if there isn't one already
3469 	if (!conn){
3470 		conn = create_connection_for_bd_addr_and_type(addr, addr_type, role);
3471 	}
3472 
3473 	// no memory, sorry.
3474 	if (!conn){
3475 		return;
3476 	}
3477 
3478 	conn->state = OPEN;
3479 	conn->con_handle             = con_handle;
3480     conn->le_connection_interval = conn_interval;
3481 
3482 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
3483     // workaround: PAST doesn't work without LE Read Remote Features on PacketCraft Controller with LMP 568B
3484     if (hci_command_supported(SUPPORTED_HCI_COMMAND_LE_READ_REMOTE_FEATURES)){
3485         conn->gap_connection_tasks = GAP_CONNECTION_TASK_LE_READ_REMOTE_FEATURES;
3486     }
3487 #endif
3488 
3489 #ifdef ENABLE_LE_PERIPHERAL
3490     if (role == HCI_ROLE_SLAVE){
3491         hci_update_advertisements_enabled_for_current_roles();
3492     }
3493 #endif
3494 
3495     // init unenhanced att bearer mtu
3496     conn->att_connection.mtu = ATT_DEFAULT_MTU;
3497     conn->att_connection.mtu_exchanged = false;
3498 
3499     // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock
3500 
3501 	// restart timer
3502 	// btstack_run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS);
3503 	// btstack_run_loop_add_timer(&conn->timeout);
3504 
3505 	log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address));
3506 
3507     // emit GAP_SUBEVENT_LE_CONNECTION_COMPLETE
3508     hci_emit_btstack_event(gap_event, sizeof(gap_event), 1);
3509 
3510     // emit BTSTACK_EVENT_NR_CONNECTIONS_CHANGED;
3511 	hci_emit_nr_connections_changed();
3512 }
3513 #endif
3514 
3515 #ifdef ENABLE_CLASSIC
3516 static bool hci_ssp_security_level_possible_for_io_cap(gap_security_level_t level, uint8_t io_cap_local, uint8_t io_cap_remote){
3517     if (io_cap_local == SSP_IO_CAPABILITY_UNKNOWN) return false;
3518     // LEVEL_4 is tested by l2cap
3519     // LEVEL 3 requires MITM protection -> check io capabilities if Authenticated is possible
3520     // @see: Core Spec v5.3, Vol 3, Part C, Table 5.7
3521     if (level >= LEVEL_3){
3522         // MITM not possible without keyboard or display
3523         if (io_cap_remote >= SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT) return false;
3524         if (io_cap_local  >= SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT) return false;
3525 
3526         // MITM possible if one side has keyboard and the other has keyboard or display
3527         if (io_cap_remote == SSP_IO_CAPABILITY_KEYBOARD_ONLY)      return true;
3528         if (io_cap_local  == SSP_IO_CAPABILITY_KEYBOARD_ONLY)      return true;
3529 
3530         // MITM not possible if one side has only display and other side has no keyboard
3531         if (io_cap_remote == SSP_IO_CAPABILITY_DISPLAY_ONLY)       return false;
3532         if (io_cap_local  == SSP_IO_CAPABILITY_DISPLAY_ONLY)       return false;
3533     }
3534     // LEVEL 2 requires SSP, which is a given
3535     return true;
3536 }
3537 
3538 static void hci_ssp_assess_security_on_io_cap_request(hci_connection_t * conn){
3539     // get requested security level
3540     gap_security_level_t requested_security_level = conn->requested_security_level;
3541     if (hci_stack->gap_secure_connections_only_mode){
3542         requested_security_level = LEVEL_4;
3543     }
3544 
3545     // assess security: LEVEL 4 requires SC
3546     // skip this preliminary test if remote features are not available yet to work around potential issue in ESP32 controller
3547     if ((requested_security_level == LEVEL_4) &&
3548         ((conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) != 0) &&
3549         !hci_remote_sc_enabled(conn)){
3550         log_info("Level 4 required, but SC not supported -> abort");
3551         hci_pairing_complete(conn, ERROR_CODE_INSUFFICIENT_SECURITY);
3552         connectionSetAuthenticationFlags(conn, AUTH_FLAG_SEND_IO_CAPABILITIES_NEGATIVE_REPLY);
3553         return;
3554     }
3555 
3556     // assess bonding requirements: abort if remote in dedicated bonding mode but we are non-bonding
3557     // - GAP/MOD/NBON/BV-02-C
3558     // - GAP/DM/NBON/BV-01-C
3559     if (conn->authentication_flags & AUTH_FLAG_RECV_IO_CAPABILITIES_RESPONSE){
3560         switch (conn->io_cap_response_auth_req){
3561             case SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING:
3562             case SSP_IO_AUTHREQ_MITM_PROTECTION_REQUIRED_DEDICATED_BONDING:
3563                 if (hci_stack->bondable == false){
3564                     log_info("Dedicated vs. non-bondable -> abort");
3565                     hci_pairing_complete(conn, ERROR_CODE_INSUFFICIENT_SECURITY);
3566                     connectionSetAuthenticationFlags(conn, AUTH_FLAG_SEND_IO_CAPABILITIES_NEGATIVE_REPLY);
3567                     return;
3568                 }
3569             default:
3570                 break;
3571         }
3572     }
3573 
3574     // assess security based on io capabilities
3575     if (conn->authentication_flags & AUTH_FLAG_RECV_IO_CAPABILITIES_RESPONSE){
3576         // responder: fully validate io caps of both sides as well as OOB data
3577         bool security_possible = false;
3578         security_possible = hci_ssp_security_level_possible_for_io_cap(requested_security_level, hci_stack->ssp_io_capability, conn->io_cap_response_io);
3579 
3580 #ifdef ENABLE_CLASSIC_PAIRING_OOB
3581         // We assume that both Controller can reach LEVEL 4, if one side has received P-192 and the other has received P-256,
3582         // so we merge the OOB data availability
3583         uint8_t have_oob_data = conn->io_cap_response_oob_data;
3584         if (conn->classic_oob_c_192 != NULL){
3585             have_oob_data |= 1;
3586         }
3587         if (conn->classic_oob_c_256 != NULL){
3588             have_oob_data |= 2;
3589         }
3590         // for up to Level 3, either P-192 as well as P-256 will do
3591         // if we don't support SC, then a) conn->classic_oob_c_256 will be NULL and b) remote should not report P-256 available
3592         // if remote does not SC, we should not receive P-256 data either
3593         if ((requested_security_level <= LEVEL_3) && (have_oob_data != 0)){
3594             security_possible = true;
3595         }
3596         // for Level 4, P-256 is needed
3597         if ((requested_security_level == LEVEL_4 && ((have_oob_data & 2) != 0))){
3598             security_possible = true;
3599         }
3600 #endif
3601 
3602         if (security_possible == false){
3603             log_info("IOCap/OOB insufficient for level %u -> abort", requested_security_level);
3604             hci_pairing_complete(conn, ERROR_CODE_INSUFFICIENT_SECURITY);
3605             connectionSetAuthenticationFlags(conn, AUTH_FLAG_SEND_IO_CAPABILITIES_NEGATIVE_REPLY);
3606             return;
3607         }
3608     } else {
3609         // initiator: remote io cap not yet, only check if we have ability for MITM protection if requested and OOB is not supported
3610 #ifndef ENABLE_CLASSIC_PAIRING_OOB
3611 #ifndef ENABLE_EXPLICIT_IO_CAPABILITIES_REPLY
3612         if ((conn->requested_security_level >= LEVEL_3) && (hci_stack->ssp_io_capability >= SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT)){
3613             log_info("Level 3+ required, but no input/output -> abort");
3614             hci_pairing_complete(conn, ERROR_CODE_INSUFFICIENT_SECURITY);
3615             connectionSetAuthenticationFlags(conn, AUTH_FLAG_SEND_IO_CAPABILITIES_NEGATIVE_REPLY);
3616             return;
3617         }
3618 #endif
3619 #endif
3620     }
3621 
3622 #ifndef ENABLE_EXPLICIT_IO_CAPABILITIES_REPLY
3623     if (hci_stack->ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN){
3624         connectionSetAuthenticationFlags(conn, AUTH_FLAG_SEND_IO_CAPABILITIES_REPLY);
3625     } else {
3626         connectionSetAuthenticationFlags(conn, AUTH_FLAG_SEND_IO_CAPABILITIES_NEGATIVE_REPLY);
3627     }
3628 #endif
3629 }
3630 
3631 #endif
3632 
3633 static void event_handler(uint8_t *packet, uint16_t size){
3634 
3635     uint16_t event_length = packet[1];
3636 
3637     // assert packet is complete
3638     if (size != (event_length + 2u)){
3639         log_error("event_handler called with packet of wrong size %d, expected %u => dropping packet", size, event_length + 2);
3640         return;
3641     }
3642 
3643     hci_con_handle_t handle;
3644     hci_connection_t * conn;
3645     int i;
3646 
3647 #ifdef ENABLE_CLASSIC
3648     hci_link_type_t link_type;
3649     bd_addr_t addr;
3650     bd_addr_type_t addr_type;
3651 #endif
3652 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
3653     hci_iso_stream_t * iso_stream;
3654     le_audio_big_t   * big;
3655     le_audio_big_sync_t * big_sync;
3656 #endif
3657 #if defined(ENABLE_LE_ISOCHRONOUS_STREAMS) || defined(ENABLE_LE_EXTENDED_ADVERTISING)
3658     btstack_linked_list_iterator_t it;
3659 #endif
3660 #if defined(ENABLE_LE_EXTENDED_ADVERTISING) && defined(ENABLE_LE_CENTRAL)
3661     uint8_t advertising_handle;
3662 #endif
3663 
3664     // log_info("HCI:EVENT:%02x", hci_event_packet_get_type(packet));
3665 
3666     switch (hci_event_packet_get_type(packet)) {
3667 
3668         case HCI_EVENT_COMMAND_COMPLETE:
3669             handle_command_complete_event(packet, size);
3670             break;
3671 
3672         case HCI_EVENT_COMMAND_STATUS:
3673             handle_command_status_event(packet, size);
3674             break;
3675 
3676         case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:{
3677             if (size < 3) return;
3678             uint16_t num_handles = packet[2];
3679             if (size != (3u + num_handles * 4u)) return;
3680 #ifdef ENABLE_CLASSIC
3681             bool notify_sco = false;
3682 #endif
3683 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
3684             bool notify_iso = false;
3685 #endif
3686             uint16_t offset = 3;
3687             for (i=0; i<num_handles;i++){
3688                 handle = little_endian_read_16(packet, offset) & 0x0fffu;
3689                 offset += 2u;
3690                 uint16_t num_packets = little_endian_read_16(packet, offset);
3691                 offset += 2u;
3692 
3693                 conn = hci_connection_for_handle(handle);
3694                 if (conn != NULL) {
3695 
3696                     if (conn->num_packets_sent >= num_packets) {
3697                         conn->num_packets_sent -= num_packets;
3698                     } else {
3699                         log_error("hci_number_completed_packets, more packet slots freed then sent.");
3700                         conn->num_packets_sent = 0;
3701                     }
3702                     // log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u", num_packets, handle, conn->num_packets_sent);
3703 #ifdef ENABLE_CLASSIC
3704                     if (conn->address_type == BD_ADDR_TYPE_SCO){
3705                         notify_sco = true;
3706                     }
3707 #endif
3708                 }
3709 
3710 #ifdef ENABLE_CONTROLLER_DUMP_PACKETS
3711                 hci_controller_dump_packets();
3712 #endif
3713 
3714 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
3715                 if (conn == NULL){
3716                     iso_stream = hci_iso_stream_for_con_handle(handle);
3717                     if (iso_stream != NULL){
3718                         if (iso_stream->num_packets_sent >= num_packets) {
3719                             iso_stream->num_packets_sent -= num_packets;
3720                         } else {
3721                             log_error("hci_number_completed_packets, more packet slots freed then sent.");
3722                             iso_stream->num_packets_sent = 0;
3723                         }
3724                         if (iso_stream->iso_type == HCI_ISO_TYPE_BIS){
3725                             big = hci_big_for_handle(iso_stream->group_id);
3726                             if (big != NULL){
3727                                 big->num_completed_timestamp_current_valid = true;
3728                                 big->num_completed_timestamp_current_ms = btstack_run_loop_get_time_ms();
3729                             }
3730                         }
3731                         log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u",
3732                                  num_packets, handle, iso_stream->num_packets_sent);
3733                         notify_iso = true;
3734                     }
3735                 }
3736 #endif
3737             }
3738 
3739 #ifdef ENABLE_CLASSIC
3740             if (notify_sco){
3741                 hci_notify_if_sco_can_send_now();
3742             }
3743 #endif
3744 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
3745             if (notify_iso){
3746                 hci_iso_notify_can_send_now();
3747             }
3748 #endif
3749             break;
3750         }
3751 
3752 #ifdef ENABLE_CLASSIC
3753         case HCI_EVENT_FLUSH_OCCURRED:
3754             // flush occurs only if automatic flush has been enabled by gap_enable_link_watchdog()
3755             handle = hci_event_flush_occurred_get_handle(packet);
3756             conn = hci_connection_for_handle(handle);
3757             if (conn) {
3758                 log_info("Flush occurred, disconnect 0x%04x", handle);
3759                 conn->state = SEND_DISCONNECT;
3760             }
3761             break;
3762 
3763         case HCI_EVENT_INQUIRY_COMPLETE:
3764             if (hci_stack->inquiry_state == GAP_INQUIRY_STATE_ACTIVE){
3765                 hci_stack->inquiry_state = GAP_INQUIRY_STATE_IDLE;
3766                 uint8_t event[] = { GAP_EVENT_INQUIRY_COMPLETE, 1, 0};
3767                 hci_emit_btstack_event(event, sizeof(event), 1);
3768             }
3769             break;
3770         case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE:
3771             if (hci_stack->remote_name_state == GAP_REMOTE_NAME_STATE_W4_COMPLETE){
3772                 hci_stack->remote_name_state = GAP_REMOTE_NAME_STATE_IDLE;
3773             }
3774             break;
3775         case HCI_EVENT_CONNECTION_REQUEST:
3776             reverse_bd_addr(&packet[2], addr);
3777             link_type = (hci_link_type_t) packet[11];
3778 
3779             // CVE-2020-26555: reject incoming connection from device with same BD ADDR
3780             if (memcmp(hci_stack->local_bd_addr, addr, 6) == 0){
3781                 hci_stack->decline_reason = ERROR_CODE_CONNECTION_REJECTED_DUE_TO_UNACCEPTABLE_BD_ADDR;
3782                 bd_addr_copy(hci_stack->decline_addr, addr);
3783                 break;
3784             }
3785 
3786             if (hci_stack->gap_classic_accept_callback != NULL){
3787                 if ((*hci_stack->gap_classic_accept_callback)(addr, link_type) == 0){
3788                     hci_stack->decline_reason = ERROR_CODE_CONNECTION_REJECTED_DUE_TO_SECURITY_REASONS;
3789                     bd_addr_copy(hci_stack->decline_addr, addr);
3790                     break;
3791                 }
3792             }
3793 
3794             // TODO: eval COD 8-10
3795             log_info("Connection_incoming: %s, type %u", bd_addr_to_str(addr), (unsigned int) link_type);
3796             addr_type = (link_type == HCI_LINK_TYPE_ACL) ? BD_ADDR_TYPE_ACL : BD_ADDR_TYPE_SCO;
3797             conn = hci_connection_for_bd_addr_and_type(addr, addr_type);
3798             if (!conn) {
3799                 conn = create_connection_for_bd_addr_and_type(addr, addr_type, HCI_ROLE_SLAVE);
3800             }
3801             if (!conn) {
3802                 // CONNECTION REJECTED DUE TO LIMITED RESOURCES (0X0D)
3803                 hci_stack->decline_reason = ERROR_CODE_CONNECTION_REJECTED_DUE_TO_LIMITED_RESOURCES;
3804                 bd_addr_copy(hci_stack->decline_addr, addr);
3805                 hci_run();
3806                 // avoid event to higher layer
3807                 return;
3808             }
3809             conn->state = RECEIVED_CONNECTION_REQUEST;
3810             // store info about eSCO
3811             if (link_type == HCI_LINK_TYPE_ESCO){
3812                 conn->remote_supported_features[0] |= 1;
3813             }
3814             // propagate remote supported sco packet packets from existing ACL to new SCO connection
3815             if (addr_type == BD_ADDR_TYPE_SCO){
3816                 const hci_connection_t * acl_conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL);
3817                 // ACL exists unless fuzzing
3818                 if (acl_conn != NULL) {
3819                     conn->remote_supported_sco_packets = acl_conn->remote_supported_sco_packets;
3820                 }
3821             }
3822             hci_run();
3823             break;
3824 
3825         case HCI_EVENT_CONNECTION_COMPLETE:
3826             // Connection management
3827             reverse_bd_addr(&packet[5], addr);
3828             log_info("Connection_complete (status=%u) %s", packet[2], bd_addr_to_str(addr));
3829             addr_type = BD_ADDR_TYPE_ACL;
3830             conn = hci_connection_for_bd_addr_and_type(addr, addr_type);
3831             if (conn) {
3832                 switch (conn->state){
3833                     // expected states
3834                     case ACCEPTED_CONNECTION_REQUEST:
3835                     case SENT_CREATE_CONNECTION:
3836                         break;
3837                     // unexpected state -> ignore
3838                     default:
3839                         // don't forward event to app
3840                         return;
3841                 }
3842                 if (!packet[2]){
3843                     conn->state = OPEN;
3844                     conn->con_handle = little_endian_read_16(packet, 3);
3845 
3846                     // trigger write supervision timeout if we're master
3847                     if ((hci_stack->link_supervision_timeout != HCI_LINK_SUPERVISION_TIMEOUT_DEFAULT) && (conn->role == HCI_ROLE_MASTER)){
3848                         conn->gap_connection_tasks |= GAP_CONNECTION_TASK_WRITE_SUPERVISION_TIMEOUT;
3849                     }
3850 
3851                     // trigger write automatic flush timeout
3852                     if (hci_stack->automatic_flush_timeout != 0){
3853                         conn->gap_connection_tasks |= GAP_CONNECTION_TASK_WRITE_AUTOMATIC_FLUSH_TIMEOUT;
3854                     }
3855 
3856                     // restart timer
3857                     btstack_run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS);
3858                     btstack_run_loop_add_timer(&conn->timeout);
3859 
3860                     // trigger remote features for dedicated bonding
3861                     if ((conn->bonding_flags & BONDING_DEDICATED) != 0){
3862                         hci_trigger_remote_features_for_connection(conn);
3863                     }
3864 
3865                     log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address));
3866 
3867                     hci_emit_nr_connections_changed();
3868                 } else {
3869                     // connection failed
3870                     hci_handle_connection_failed(conn, packet[2]);
3871                 }
3872             }
3873             break;
3874 
3875         case HCI_EVENT_SYNCHRONOUS_CONNECTION_COMPLETE:
3876             reverse_bd_addr(&packet[5], addr);
3877             conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_SCO);
3878             log_info("Synchronous Connection Complete for %p (status=%u) %s", conn, packet[2], bd_addr_to_str(addr));
3879 
3880             // SCO exists unless fuzzer
3881             if (conn == NULL) break;
3882 
3883             if (packet[2] != ERROR_CODE_SUCCESS){
3884                 // connection failed, remove entry
3885                 hci_handle_connection_failed(conn, packet[2]);
3886                 break;
3887             }
3888 
3889             conn->state = OPEN;
3890             conn->con_handle = little_endian_read_16(packet, 3);
3891 
3892             // update sco payload length for eSCO connections
3893             if (hci_event_synchronous_connection_complete_get_tx_packet_length(packet) > 0){
3894                 conn->sco_payload_length = hci_event_synchronous_connection_complete_get_tx_packet_length(packet);
3895                 log_info("eSCO Complete, set payload len %u", conn->sco_payload_length);
3896             }
3897 
3898 #ifdef ENABLE_SCO_OVER_HCI
3899             // update SCO
3900             if (conn->address_type == BD_ADDR_TYPE_SCO && hci_stack->hci_transport && hci_stack->hci_transport->set_sco_config){
3901                 hci_stack->hci_transport->set_sco_config(hci_stack->sco_voice_setting_active, hci_number_sco_connections());
3902             }
3903             // trigger can send now
3904             if (hci_have_usb_transport()){
3905                 hci_stack->sco_can_send_now = true;
3906             }
3907 
3908             // setup implicit sco flow control
3909             conn->sco_tx_ready = 0;
3910             conn->sco_tx_active  = 0;
3911             conn->sco_established_ms = btstack_run_loop_get_time_ms();
3912 
3913 #endif
3914 #ifdef HAVE_SCO_TRANSPORT
3915             // configure sco transport
3916             if (hci_stack->sco_transport != NULL){
3917                 sco_format_t sco_format = ((hci_stack->sco_voice_setting_active & 0x03) == 0x03) ? SCO_FORMAT_8_BIT : SCO_FORMAT_16_BIT;
3918                 hci_stack->sco_transport->open(conn->con_handle, sco_format);
3919             }
3920 #endif
3921             break;
3922 
3923         case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE:
3924             handle = little_endian_read_16(packet, 3);
3925             conn = hci_connection_for_handle(handle);
3926             if (!conn) break;
3927             if (!packet[2]){
3928                 const uint8_t * features = &packet[5];
3929                 hci_handle_remote_features_page_0(conn, features);
3930 
3931                 // read extended features if possible
3932                 if (hci_command_supported(SUPPORTED_HCI_COMMAND_READ_REMOTE_EXTENDED_FEATURES)
3933                 && ((conn->remote_supported_features[0] & 2) != 0)) {
3934                     conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES_PAGE_1;
3935                     break;
3936                 }
3937             }
3938             hci_handle_remote_features_received(conn);
3939             break;
3940 
3941         case HCI_EVENT_READ_REMOTE_EXTENDED_FEATURES_COMPLETE:
3942             handle = little_endian_read_16(packet, 3);
3943             conn = hci_connection_for_handle(handle);
3944             if (!conn) break;
3945             // status = ok, page = 1
3946             if (!packet[2]) {
3947                 uint8_t page_number = packet[5];
3948                 uint8_t maximum_page_number = packet[6];
3949                 const uint8_t * features = &packet[7];
3950                 bool done = false;
3951                 switch (page_number){
3952                     case 1:
3953                         hci_handle_remote_features_page_1(conn, features);
3954                         if (maximum_page_number >= 2){
3955                             // get Secure Connections (Controller) from Page 2 if available
3956                             conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES_PAGE_2;
3957                         } else {
3958                             // otherwise, assume SC (Controller) == SC (Host)
3959                             if ((conn->bonding_flags & BONDING_REMOTE_SUPPORTS_SC_HOST) != 0){
3960                                 conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SC_CONTROLLER;
3961                             }
3962                             done = true;
3963                         }
3964                         break;
3965                     case 2:
3966                         hci_handle_remote_features_page_2(conn, features);
3967                         done = true;
3968                         break;
3969                     default:
3970                         break;
3971                 }
3972                 if (!done) break;
3973             }
3974             hci_handle_remote_features_received(conn);
3975             break;
3976 
3977         case HCI_EVENT_LINK_KEY_REQUEST:
3978 #ifndef ENABLE_EXPLICIT_LINK_KEY_REPLY
3979             hci_event_link_key_request_get_bd_addr(packet, addr);
3980             conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL);
3981             if (!conn) break;
3982 
3983             // lookup link key in db if not cached
3984             if ((conn->link_key_type == INVALID_LINK_KEY) && (hci_stack->link_key_db != NULL)){
3985                 hci_stack->link_key_db->get_link_key(conn->address, conn->link_key, &conn->link_key_type);
3986             }
3987 
3988             // response sent by hci_run()
3989             conn->authentication_flags |= AUTH_FLAG_HANDLE_LINK_KEY_REQUEST;
3990 #endif
3991             break;
3992 
3993         case HCI_EVENT_LINK_KEY_NOTIFICATION: {
3994             hci_event_link_key_request_get_bd_addr(packet, addr);
3995             conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL);
3996             if (!conn) break;
3997 
3998             hci_pairing_complete(conn, ERROR_CODE_SUCCESS);
3999 
4000             // CVE-2020-26555: ignore NULL link key
4001             // default link_key_type = INVALID_LINK_KEY asserts that NULL key won't be used for encryption
4002             if (btstack_is_null(&packet[8], 16)) break;
4003 
4004             link_key_type_t link_key_type = (link_key_type_t)packet[24];
4005             // Change Connection Encryption keeps link key type
4006             if (link_key_type != CHANGED_COMBINATION_KEY){
4007                 conn->link_key_type = link_key_type;
4008             }
4009 
4010             // cache link key. link keys stored in little-endian format for legacy reasons
4011             memcpy(&conn->link_key, &packet[8], 16);
4012 
4013             // only store link key:
4014             // - if bondable enabled
4015             if (hci_stack->bondable == false) break;
4016             // - if security level sufficient
4017             if (gap_security_level_for_link_key_type(link_key_type) < conn->requested_security_level) break;
4018             gap_store_link_key_for_bd_addr(addr, &packet[8], conn->link_key_type);
4019             break;
4020         }
4021 
4022         case HCI_EVENT_PIN_CODE_REQUEST:
4023             hci_event_pin_code_request_get_bd_addr(packet, addr);
4024             conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL);
4025             if (!conn) break;
4026 
4027             hci_pairing_started(conn, false);
4028             // abort pairing if: non-bondable mode (pin code request is not forwarded to app)
4029             if (!hci_stack->bondable ){
4030                 conn->authentication_flags |= AUTH_FLAG_DENY_PIN_CODE_REQUEST;
4031                 hci_pairing_complete(conn, ERROR_CODE_PAIRING_NOT_ALLOWED);
4032                 hci_run();
4033                 return;
4034             }
4035             // abort pairing if: LEVEL_4 required (pin code request is not forwarded to app)
4036             if ((hci_stack->gap_secure_connections_only_mode) || (conn->requested_security_level == LEVEL_4)){
4037                 log_info("Level 4 required, but SC not supported -> abort");
4038                 conn->authentication_flags |= AUTH_FLAG_DENY_PIN_CODE_REQUEST;
4039                 hci_pairing_complete(conn, ERROR_CODE_INSUFFICIENT_SECURITY);
4040                 hci_run();
4041                 return;
4042             }
4043             break;
4044 
4045         case HCI_EVENT_IO_CAPABILITY_RESPONSE:
4046             hci_event_io_capability_response_get_bd_addr(packet, addr);
4047             conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL);
4048             if (!conn) break;
4049 
4050             hci_add_connection_flags_for_flipped_bd_addr(&packet[2], AUTH_FLAG_RECV_IO_CAPABILITIES_RESPONSE);
4051             hci_pairing_started(conn, true);
4052             conn->io_cap_response_auth_req = hci_event_io_capability_response_get_authentication_requirements(packet);
4053             conn->io_cap_response_io       = hci_event_io_capability_response_get_io_capability(packet);
4054 #ifdef ENABLE_CLASSIC_PAIRING_OOB
4055             conn->io_cap_response_oob_data = hci_event_io_capability_response_get_oob_data_present(packet);
4056 #endif
4057             break;
4058 
4059         case HCI_EVENT_IO_CAPABILITY_REQUEST:
4060             hci_event_io_capability_response_get_bd_addr(packet, addr);
4061             conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL);
4062             if (!conn) break;
4063 
4064             hci_add_connection_flags_for_flipped_bd_addr(&packet[2], AUTH_FLAG_RECV_IO_CAPABILITIES_REQUEST);
4065             hci_connection_timestamp(conn);
4066             hci_pairing_started(conn, true);
4067             break;
4068 
4069 #ifdef ENABLE_CLASSIC_PAIRING_OOB
4070         case HCI_EVENT_REMOTE_OOB_DATA_REQUEST:
4071             hci_event_remote_oob_data_request_get_bd_addr(packet, addr);
4072             conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL);
4073             if (!conn) break;
4074 
4075             hci_connection_timestamp(conn);
4076 
4077             hci_pairing_started(conn, true);
4078 
4079             connectionSetAuthenticationFlags(conn, AUTH_FLAG_SEND_REMOTE_OOB_DATA_REPLY);
4080             break;
4081 #endif
4082 
4083         case HCI_EVENT_USER_CONFIRMATION_REQUEST:
4084             hci_event_user_confirmation_request_get_bd_addr(packet, addr);
4085             conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL);
4086             if (!conn) break;
4087             if (hci_ssp_security_level_possible_for_io_cap(conn->requested_security_level, hci_stack->ssp_io_capability, conn->io_cap_response_io)) {
4088                 if (hci_stack->ssp_auto_accept){
4089                     hci_add_connection_flags_for_flipped_bd_addr(&packet[2], AUTH_FLAG_SEND_USER_CONFIRM_REPLY);
4090                 };
4091             } else {
4092                 hci_pairing_complete(conn, ERROR_CODE_INSUFFICIENT_SECURITY);
4093                 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], AUTH_FLAG_SEND_USER_CONFIRM_NEGATIVE_REPLY);
4094                 // don't forward event to app
4095                 hci_run();
4096                 return;
4097             }
4098             break;
4099 
4100         case HCI_EVENT_USER_PASSKEY_REQUEST:
4101             // Pairing using Passkey results in MITM protection. If Level 4 is required, support for SC is validated on IO Cap Request
4102             if (hci_stack->ssp_auto_accept){
4103                 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], AUTH_FLAG_SEND_USER_PASSKEY_REPLY);
4104             };
4105             break;
4106 
4107         case HCI_EVENT_MODE_CHANGE:
4108             handle = hci_event_mode_change_get_handle(packet);
4109             conn = hci_connection_for_handle(handle);
4110             if (!conn) break;
4111             conn->connection_mode = hci_event_mode_change_get_mode(packet);
4112             log_info("HCI_EVENT_MODE_CHANGE, handle 0x%04x, mode %u", handle, conn->connection_mode);
4113             break;
4114 #endif
4115 
4116         case HCI_EVENT_ENCRYPTION_CHANGE:
4117         case HCI_EVENT_ENCRYPTION_CHANGE_V2:
4118             handle = hci_event_encryption_change_get_connection_handle(packet);
4119             conn = hci_connection_for_handle(handle);
4120             if (!conn) break;
4121             if (hci_event_encryption_change_get_status(packet) == ERROR_CODE_SUCCESS) {
4122                 uint8_t encryption_enabled = hci_event_encryption_change_get_encryption_enabled(packet);
4123                 if (encryption_enabled){
4124                     if (hci_is_le_connection(conn)){
4125                         // For LE, we accept connection as encrypted
4126                         conn->authentication_flags |= AUTH_FLAG_CONNECTION_ENCRYPTED;
4127                     }
4128 #ifdef ENABLE_CLASSIC
4129                     else {
4130 
4131                         // Detect Secure Connection -> Legacy Connection Downgrade Attack (BIAS)
4132                         bool sc_used_during_pairing = gap_secure_connection_for_link_key_type(conn->link_key_type);
4133                         bool connected_uses_aes_ccm = encryption_enabled == 2;
4134                         if (hci_stack->secure_connections_active && sc_used_during_pairing && !connected_uses_aes_ccm){
4135 #ifdef ENABLE_TESTING_SUPPORT
4136                             // The following tests require to reject L2CAP connection as SC has been disabled on the remote
4137                             // - GAP/SEC/SEM/BI-31-C
4138                             // - GAP/SEC/SEM/BI-32-C
4139                             // - GAP/SEC/SEM/BI-33-C
4140 
4141                             // Our release code (aggressively) disconnects the HCI connection, without a chance to respond to PTS
4142                             // To pass the tests, we only downgrade the link key type instead of the more secure disconnect
4143                             link_key_type_t new_link_key_type = UNAUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192;
4144                             if (conn->link_key_type == AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256){
4145                                 new_link_key_type = AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192;
4146                             }
4147                             log_info("SC during pairing, but only E0 now -> downgrade link key type from %u to %u",
4148                                      conn->link_key_type, new_link_key_type);
4149                             conn->link_key_type = new_link_key_type;
4150 #else
4151                             log_info("SC during pairing, but only E0 now -> abort");
4152                             conn->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK;
4153                             break;
4154 #endif
4155                         }
4156 
4157 #ifdef ENABLE_MUTUAL_AUTHENTICATION_FOR_LEGACY_SECURE_CONNECTIONS
4158                         // if AES-CCM is used, authentication used SC -> authentication was mutual and we can skip explicit authentication
4159                         if (connected_uses_aes_ccm){
4160                             conn->authentication_flags |= AUTH_FLAG_CONNECTION_AUTHENTICATED;
4161                         }
4162 #else
4163                         // We consider even Legacy Secure Connections as authenticated as BTstack mandates encryption
4164                         // with encryption key size > hci_stack->gap_required_encryption_key_size
4165                         // for all operations that require any security. See BIAS attacks.
4166                         conn->authentication_flags |= AUTH_FLAG_CONNECTION_AUTHENTICATED;
4167 #endif
4168                         // validate encryption key size
4169                         if (hci_event_packet_get_type(packet) == HCI_EVENT_ENCRYPTION_CHANGE_V2) {
4170                             uint8_t encryption_key_size = hci_event_encryption_change_v2_get_encryption_key_size(packet);
4171                             // already got encryption key size
4172                             hci_handle_read_encryption_key_size_complete(conn, encryption_key_size);
4173                         } else {
4174                             if (hci_command_supported(SUPPORTED_HCI_COMMAND_READ_ENCRYPTION_KEY_SIZE)) {
4175                                 // For Classic, we need to validate encryption key size first, if possible (== supported by Controller)
4176                                 conn->bonding_flags |= BONDING_SEND_READ_ENCRYPTION_KEY_SIZE;
4177                             } else {
4178                                 // if not, pretend everything is perfect
4179                                 hci_handle_read_encryption_key_size_complete(conn, 16);
4180                             }
4181                         }
4182                     }
4183 #endif
4184                 } else {
4185                     conn->authentication_flags &= ~AUTH_FLAG_CONNECTION_ENCRYPTED;
4186                 }
4187             } else {
4188 #ifdef ENABLE_CLASSIC
4189                 if (!hci_is_le_connection(conn)){
4190                     uint8_t status = hci_event_encryption_change_get_status(packet);
4191                     if ((conn->bonding_flags & BONDING_DEDICATED) != 0){
4192                         conn->bonding_flags &= ~BONDING_DEDICATED;
4193                         conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE;
4194                         conn->bonding_status = status;
4195                     }
4196                     // trigger security update -> level 0
4197                     hci_handle_mutual_authentication_completed(conn);
4198                 }
4199 #endif
4200             }
4201 
4202             break;
4203 
4204 #ifdef ENABLE_CLASSIC
4205         case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT:
4206             handle = hci_event_authentication_complete_get_connection_handle(packet);
4207             conn = hci_connection_for_handle(handle);
4208             if (!conn) break;
4209 
4210             // clear authentication active flag
4211             conn->bonding_flags &= ~BONDING_SENT_AUTHENTICATE_REQUEST;
4212             hci_pairing_complete(conn, hci_event_authentication_complete_get_status(packet));
4213 
4214             // authenticated only if auth status == 0
4215             if (hci_event_authentication_complete_get_status(packet) == 0){
4216                 // authenticated
4217                 conn->authentication_flags |= AUTH_FLAG_CONNECTION_AUTHENTICATED;
4218 
4219                 // If not already encrypted, start encryption
4220                 if ((conn->authentication_flags & AUTH_FLAG_CONNECTION_ENCRYPTED) == 0){
4221                     conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST;
4222                     break;
4223                 }
4224             }
4225 
4226             // emit updated security level (will be 0 if not authenticated)
4227             hci_handle_mutual_authentication_completed(conn);
4228             break;
4229 
4230         case HCI_EVENT_SIMPLE_PAIRING_COMPLETE:
4231             hci_event_simple_pairing_complete_get_bd_addr(packet, addr);
4232             conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL);
4233             if (!conn) break;
4234 
4235             // treat successfully paired connection as authenticated
4236             if (hci_event_simple_pairing_complete_get_status(packet) == ERROR_CODE_SUCCESS){
4237                 conn->authentication_flags |= AUTH_FLAG_CONNECTION_AUTHENTICATED;
4238             }
4239 
4240             hci_pairing_complete(conn, hci_event_simple_pairing_complete_get_status(packet));
4241             break;
4242 #endif
4243 
4244         // HCI_EVENT_DISCONNECTION_COMPLETE
4245         // has been split, to first notify stack before shutting connection down
4246         // see end of function, too.
4247         case HCI_EVENT_DISCONNECTION_COMPLETE:
4248             if (packet[2]) break;   // status != 0
4249             handle = little_endian_read_16(packet, 3);
4250             // drop outgoing ACL fragments if it is for closed connection and release buffer if tx not active
4251             if (hci_stack->acl_fragmentation_total_size > 0u) {
4252                 if (handle == READ_ACL_CONNECTION_HANDLE(hci_stack->hci_packet_buffer)){
4253                     int release_buffer = hci_stack->acl_fragmentation_tx_active == 0u;
4254                     log_info("drop fragmented ACL data for closed connection, release buffer %u", release_buffer);
4255                     hci_stack->acl_fragmentation_total_size = 0;
4256                     hci_stack->acl_fragmentation_pos = 0;
4257                     if (release_buffer){
4258                         hci_release_packet_buffer();
4259                     }
4260                 }
4261             }
4262 
4263 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
4264             // drop outgoing ISO fragments if it is for closed connection and release buffer if tx not active
4265             if (hci_stack->iso_fragmentation_total_size > 0u) {
4266                 if (handle == READ_ISO_CONNECTION_HANDLE(hci_stack->hci_packet_buffer)){
4267                     int release_buffer = hci_stack->iso_fragmentation_tx_active == 0u;
4268                     log_info("drop fragmented ISO data for closed connection, release buffer %u", release_buffer);
4269                     hci_stack->iso_fragmentation_total_size = 0;
4270                     hci_stack->iso_fragmentation_pos = 0;
4271                     if (release_buffer){
4272                         hci_release_packet_buffer();
4273                     }
4274                 }
4275             }
4276 
4277             // finalize iso stream for CIS handle
4278             iso_stream = hci_iso_stream_for_con_handle(handle);
4279             if (iso_stream != NULL){
4280                 hci_iso_stream_finalize(iso_stream);
4281                 break;
4282             }
4283 #endif
4284 
4285 #if defined(ENABLE_BLE) && defined (ENABLE_HCI_COMMAND_STATUS_DISCARDED_FOR_FAILED_CONNECTIONS_WORKAROUND)
4286             if ((handle != HCI_CON_HANDLE_INVALID) && (handle == hci_stack->hci_command_con_handle)){
4287                 // we did not receive a HCI Command Complete or HCI Command Status event for the disconnected connection
4288                 // if needed, we could also track the hci command opcode and simulate a hci command complete with status
4289                 // but the connection has failed anyway, so for now, we only set the num hci commands back to 1
4290                 log_info("Disconnect for conn handle 0x%04x in pending HCI command, assume command failed", handle);
4291                 hci_stack->hci_command_con_handle = HCI_CON_HANDLE_INVALID;
4292                 hci_stack->num_cmd_packets = 1;
4293             }
4294 #endif
4295 
4296             conn = hci_connection_for_handle(handle);
4297             if (!conn) break;
4298 #ifdef ENABLE_CLASSIC
4299             // pairing failed if it was ongoing
4300             hci_pairing_complete(conn, ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION);
4301 #endif
4302 
4303             // emit dedicated bonding event
4304             if (conn->bonding_flags & BONDING_EMIT_COMPLETE_ON_DISCONNECT){
4305                 hci_emit_dedicated_bonding_result(conn->address, conn->bonding_status);
4306             }
4307 
4308             // mark connection for shutdown, stop timers, reset state
4309             conn->state = RECEIVED_DISCONNECTION_COMPLETE;
4310             hci_connection_stop_timer(conn);
4311             hci_connection_init(conn);
4312 
4313 #ifdef ENABLE_BLE
4314 #ifdef ENABLE_LE_PERIPHERAL
4315             // re-enable advertisements for le connections if active
4316             if (hci_is_le_connection(conn)){
4317                 hci_update_advertisements_enabled_for_current_roles();
4318             }
4319 #endif
4320 #endif
4321             break;
4322 
4323         case HCI_EVENT_HARDWARE_ERROR:
4324             log_error("Hardware Error: 0x%02x", packet[2]);
4325             if (hci_stack->hardware_error_callback){
4326                 (*hci_stack->hardware_error_callback)(packet[2]);
4327             } else {
4328                 // if no special requests, just reboot stack
4329                 hci_power_control_off();
4330                 hci_power_control_on();
4331             }
4332             break;
4333 
4334 #ifdef ENABLE_CLASSIC
4335         case HCI_EVENT_ROLE_CHANGE:
4336             if (packet[2]) break;   // status != 0
4337             reverse_bd_addr(&packet[3], addr);
4338             addr_type = BD_ADDR_TYPE_ACL;
4339             conn = hci_connection_for_bd_addr_and_type(addr, addr_type);
4340             if (!conn) break;
4341             conn->role = (hci_role_t) packet[9];
4342             break;
4343 #endif
4344 
4345         case HCI_EVENT_TRANSPORT_PACKET_SENT:
4346             // release packet buffer only for asynchronous transport and if there are not further fragments
4347             if (hci_transport_synchronous()) {
4348                 log_error("Synchronous HCI Transport shouldn't send HCI_EVENT_TRANSPORT_PACKET_SENT");
4349                 return; // instead of break: to avoid re-entering hci_run()
4350             }
4351             hci_stack->acl_fragmentation_tx_active = 0;
4352 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
4353             hci_stack->iso_fragmentation_tx_active = 0;
4354             if (hci_stack->iso_fragmentation_total_size) break;
4355 #endif
4356             if (hci_stack->acl_fragmentation_total_size) break;
4357 
4358             // release packet buffer without HCI_EVENT_TRANSPORT_PACKET_SENT (as it will be later)
4359             hci_stack->hci_packet_buffer_reserved = false;
4360 
4361 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
4362             hci_iso_notify_can_send_now();
4363 #endif
4364             // L2CAP receives this event via the hci_emit_event below
4365 
4366 #ifdef ENABLE_CLASSIC
4367             // For SCO, we do the can_send_now_check here
4368             hci_notify_if_sco_can_send_now();
4369 #endif
4370             break;
4371 
4372 #ifdef ENABLE_CLASSIC
4373         case HCI_EVENT_SCO_CAN_SEND_NOW:
4374             // For SCO, we do the can_send_now_check here
4375             hci_stack->sco_can_send_now = true;
4376             hci_notify_if_sco_can_send_now();
4377             return;
4378 
4379         // explode inquiry results for easier consumption
4380         case HCI_EVENT_INQUIRY_RESULT:
4381         case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:
4382         case HCI_EVENT_EXTENDED_INQUIRY_RESPONSE:
4383             gap_inquiry_explode(packet, size);
4384             break;
4385 #endif
4386 
4387 #ifdef ENABLE_BLE
4388         case HCI_EVENT_LE_META:
4389             switch (packet[2]){
4390 #ifdef ENABLE_LE_CENTRAL
4391                 case HCI_SUBEVENT_LE_ADVERTISING_REPORT:
4392                     if (!hci_stack->le_scanning_enabled) break;
4393                     le_handle_advertisement_report(packet, size);
4394                     break;
4395 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
4396                 case HCI_SUBEVENT_LE_EXTENDED_ADVERTISING_REPORT:
4397                     if (!hci_stack->le_scanning_enabled) break;
4398                     le_handle_extended_advertisement_report(packet, size);
4399                     break;
4400                 case HCI_SUBEVENT_LE_PERIODIC_ADVERTISING_SYNC_ESTABLISHMENT:
4401                     hci_stack->le_periodic_sync_request = LE_CONNECTING_IDLE;
4402                     hci_stack->le_periodic_sync_state = LE_CONNECTING_IDLE;
4403                     break;
4404                 case HCI_SUBEVENT_LE_ADVERTISING_SET_TERMINATED:
4405                     advertising_handle = hci_subevent_le_advertising_set_terminated_get_advertising_handle(packet);
4406                     btstack_linked_list_iterator_init(&it, &hci_stack->le_advertising_sets);
4407                     while (btstack_linked_list_iterator_has_next(&it)) {
4408                         le_advertising_set_t *advertising_set = (le_advertising_set_t *) btstack_linked_list_iterator_next(&it);
4409                         if (advertising_set->advertising_handle == advertising_handle){
4410                             advertising_set->state &= ~(LE_ADVERTISEMENT_STATE_ACTIVE | LE_ADVERTISEMENT_STATE_ENABLED);
4411                         }
4412                     }
4413                     // support legacy advertisements
4414                     if (advertising_handle == 0){
4415                         hci_stack->le_advertisements_state &= ~LE_ADVERTISEMENT_STATE_ACTIVE;
4416                         hci_update_advertisements_enabled_for_current_roles();
4417                     }
4418                     // event may come before le connection complete and announces new connection
4419                     if (hci_subevent_le_advertising_set_terminated_get_status(packet) == ERROR_CODE_SUCCESS){
4420                         handle = hci_subevent_le_advertising_set_terminated_get_connection_handle(packet);
4421                         conn = hci_connection_for_handle(handle);
4422                         if (conn == NULL){
4423                             conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_LE_PUBLIC, HCI_ROLE_SLAVE);
4424                             if (conn != NULL){
4425                                 conn->state = ANNOUNCED;
4426                                 conn->con_handle = handle;
4427                             }
4428                         }
4429                     }
4430                     break;
4431 #endif
4432 #endif
4433                 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE:
4434                 case HCI_SUBEVENT_LE_ENHANCED_CONNECTION_COMPLETE_V1:
4435                 case HCI_SUBEVENT_LE_ENHANCED_CONNECTION_COMPLETE_V2:
4436                     hci_handle_le_connection_complete_event(packet);
4437                     break;
4438 
4439                 // log_info("LE buffer size: %u, count %u", little_endian_read_16(packet,6), packet[8]);
4440                 case HCI_SUBEVENT_LE_CONNECTION_UPDATE_COMPLETE:
4441                     handle = hci_subevent_le_connection_update_complete_get_connection_handle(packet);
4442                     conn = hci_connection_for_handle(handle);
4443                     if (!conn) break;
4444                     conn->le_connection_interval = hci_subevent_le_connection_update_complete_get_conn_interval(packet);
4445                     break;
4446 
4447                 case HCI_SUBEVENT_LE_REMOTE_CONNECTION_PARAMETER_REQUEST:
4448                     // connection
4449                     handle = hci_subevent_le_remote_connection_parameter_request_get_connection_handle(packet);
4450                     conn = hci_connection_for_handle(handle);
4451                     if (conn) {
4452                         // read arguments
4453                         uint16_t le_conn_interval_min   = hci_subevent_le_remote_connection_parameter_request_get_interval_min(packet);
4454                         uint16_t le_conn_interval_max   = hci_subevent_le_remote_connection_parameter_request_get_interval_max(packet);
4455                         uint16_t le_conn_latency        = hci_subevent_le_remote_connection_parameter_request_get_latency(packet);
4456                         uint16_t le_supervision_timeout = hci_subevent_le_remote_connection_parameter_request_get_timeout(packet);
4457 
4458                         // validate against current connection parameter range
4459                         le_connection_parameter_range_t existing_range;
4460                         gap_get_connection_parameter_range(&existing_range);
4461                         int update_parameter = gap_connection_parameter_range_included(&existing_range, le_conn_interval_min, le_conn_interval_max, le_conn_latency, le_supervision_timeout);
4462                         if (update_parameter){
4463                             conn->le_con_parameter_update_state = CON_PARAMETER_UPDATE_REPLY;
4464                             conn->le_conn_interval_min = le_conn_interval_min;
4465                             conn->le_conn_interval_max = le_conn_interval_max;
4466                             conn->le_conn_latency = le_conn_latency;
4467                             conn->le_supervision_timeout = le_supervision_timeout;
4468                         } else {
4469                             conn->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NEGATIVE_REPLY;
4470                         }
4471                     }
4472                     break;
4473 #ifdef ENABLE_LE_LIMIT_ACL_FRAGMENT_BY_MAX_OCTETS
4474                 case HCI_SUBEVENT_LE_DATA_LENGTH_CHANGE:
4475                     handle = hci_subevent_le_data_length_change_get_connection_handle(packet);
4476                     conn = hci_connection_for_handle(handle);
4477                     if (conn) {
4478                         conn->le_max_tx_octets = hci_subevent_le_data_length_change_get_max_tx_octets(packet);
4479                     }
4480                     break;
4481 #endif
4482 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
4483                 case HCI_SUBEVENT_LE_CIS_REQUEST:
4484                     // incoming CIS request, allocate iso stream object and cache metadata
4485                     iso_stream = hci_iso_stream_create(HCI_ISO_TYPE_CIS, HCI_ISO_STREAM_W4_USER,
4486                                                        hci_subevent_le_cis_request_get_cig_id(packet),
4487                                                        hci_subevent_le_cis_request_get_cis_id(packet));
4488                     // if there's no memory, gap_cis_accept/gap_cis_reject will fail
4489                     if (iso_stream != NULL){
4490                         iso_stream->cis_handle = hci_subevent_le_cis_request_get_cis_connection_handle(packet);
4491                         iso_stream->acl_handle = hci_subevent_le_cis_request_get_acl_connection_handle(packet);
4492                     }
4493                     break;
4494                 case HCI_SUBEVENT_LE_CIS_ESTABLISHED:
4495                     if (hci_stack->iso_active_operation_type == HCI_ISO_TYPE_CIS){
4496                         handle = hci_subevent_le_cis_established_get_connection_handle(packet);
4497                         uint8_t status = hci_subevent_le_cis_established_get_status(packet);
4498                         iso_stream = hci_iso_stream_for_con_handle(handle);
4499                         btstack_assert(iso_stream != NULL);
4500                         // track connection info
4501                         iso_stream->number_of_subevents  = hci_subevent_le_cis_established_get_nse(packet);
4502                         iso_stream->burst_number_c_to_p  = hci_subevent_le_cis_established_get_bn_c_to_p(packet);
4503                         iso_stream->burst_number_p_to_c  = hci_subevent_le_cis_established_get_bn_p_to_c(packet);
4504                         iso_stream->flush_timeout_c_to_p = hci_subevent_le_cis_established_get_ft_c_to_p(packet);
4505                         iso_stream->flush_timeout_p_to_c = hci_subevent_le_cis_established_get_ft_p_to_c(packet);
4506                         iso_stream->max_sdu_c_to_p       = hci_subevent_le_cis_established_get_max_pdu_c_to_p(packet);
4507                         iso_stream->max_sdu_p_to_c       = hci_subevent_le_cis_established_get_max_pdu_p_to_c(packet);
4508                         iso_stream->iso_interval_1250us  = hci_subevent_le_cis_established_get_iso_interval(packet);
4509                         if (hci_stack->iso_active_operation_group_id == HCI_ISO_GROUP_ID_SINGLE_CIS){
4510                             // CIS Accept by Peripheral
4511                             if (status == ERROR_CODE_SUCCESS){
4512                                 if (iso_stream->max_sdu_p_to_c > 0){
4513                                     // we're peripheral and we will send data
4514                                     iso_stream->state = HCI_ISO_STREAM_STATE_W2_SETUP_ISO_INPUT;
4515                                 } else {
4516                                     // we're peripheral and we will only receive data
4517                                     iso_stream->state = HCI_ISO_STREAM_STATE_W2_SETUP_ISO_OUTPUT;
4518                                 }
4519                             } else {
4520                                 hci_cis_handle_created(iso_stream, status);
4521                             }
4522                             hci_stack->iso_active_operation_type = HCI_ISO_TYPE_INVALID;
4523                         } else {
4524                             // CIG Setup by Central
4525                             le_audio_cig_t * cig = hci_cig_for_id(hci_stack->iso_active_operation_group_id);
4526                             btstack_assert(cig != NULL);
4527                             // update iso stream state
4528                             if (status == ERROR_CODE_SUCCESS){
4529                                 iso_stream->state = HCI_ISO_STREAM_STATE_ESTABLISHED;
4530                             } else {
4531                                 iso_stream->state = HCI_ISO_STREAM_STATE_IDLE;
4532                             }
4533                             // update cig state
4534                             for (i=0;i<cig->num_cis;i++){
4535                                 if (cig->cis_con_handles[i] == handle){
4536                                     cig->cis_setup_active[i] = false;
4537                                     if (status == ERROR_CODE_SUCCESS){
4538                                         cig->cis_established[i] = true;
4539                                     } else {
4540                                         hci_cis_handle_created(iso_stream, status);
4541                                     }
4542                                 }
4543                             }
4544 
4545                             // trigger iso path setup if complete
4546                             bool cis_setup_active = false;
4547                             for (i=0;i<cig->num_cis;i++){
4548                                 cis_setup_active |= cig->cis_setup_active[i];
4549                             }
4550                             if (cis_setup_active == false){
4551                                 cig->state_vars.next_cis = 0;
4552                                 cig->state = LE_AUDIO_CIG_STATE_SETUP_ISO_PATH;
4553                                 hci_stack->iso_active_operation_type = HCI_ISO_TYPE_INVALID;
4554                             }
4555                         }
4556                     }
4557                     break;
4558                 case HCI_SUBEVENT_LE_CREATE_BIG_COMPLETE:
4559                     hci_stack->iso_active_operation_type = HCI_ISO_TYPE_INVALID;
4560                     big = hci_big_for_handle(packet[4]);
4561                     if (big != NULL){
4562                         uint8_t status = packet[3];
4563                         if (status == ERROR_CODE_SUCCESS){
4564                             // store bis_con_handles and trigger iso path setup
4565                             uint8_t num_bis = btstack_min(big->num_bis, packet[20]);
4566 
4567                             for (i=0;i<num_bis;i++){
4568                                 hci_con_handle_t bis_handle = (hci_con_handle_t) little_endian_read_16(packet, 21 + (2 * i));
4569                                 big->bis_con_handles[i] = bis_handle;
4570                                 // assign bis handle
4571                                 btstack_linked_list_iterator_init(&it, &hci_stack->iso_streams);
4572                                 while (btstack_linked_list_iterator_has_next(&it)){
4573                                     iso_stream = (hci_iso_stream_t *) btstack_linked_list_iterator_next(&it);
4574                                     if ((iso_stream->state == HCI_ISO_STREAM_STATE_REQUESTED ) &&
4575                                         (iso_stream->group_id == big->big_handle)){
4576                                         iso_stream->cis_handle = bis_handle;
4577                                         iso_stream->state = HCI_ISO_STREAM_STATE_ESTABLISHED;
4578                                         break;
4579                                     }
4580                                 }
4581                             }
4582                             if (big->state == LE_AUDIO_BIG_STATE_W4_ESTABLISHED) {
4583                                 big->state = LE_AUDIO_BIG_STATE_SETUP_ISO_PATH;
4584                                 big->state_vars.next_bis = 0;
4585                             }
4586                         } else {
4587                             // create BIG failed or has been stopped by us
4588                             hci_iso_create_big_failed(big, status);
4589                         }
4590                     }
4591                     break;
4592                 case HCI_SUBEVENT_LE_TERMINATE_BIG_COMPLETE:
4593                     hci_stack->iso_active_operation_type = HCI_ISO_TYPE_INVALID;
4594                     big = hci_big_for_handle(hci_subevent_le_terminate_big_complete_get_big_handle(packet));
4595                     if (big != NULL){
4596                         // finalize associated ISO streams
4597 
4598                         btstack_linked_list_iterator_init(&it, &hci_stack->iso_streams);
4599                         while (btstack_linked_list_iterator_has_next(&it)){
4600                             iso_stream = (hci_iso_stream_t *) btstack_linked_list_iterator_next(&it);
4601                             if (iso_stream->group_id == big->big_handle){
4602                                 log_info("BIG Terminated, big_handle 0x%02x, con handle 0x%04x", iso_stream->group_id, iso_stream->cis_handle);
4603                                 btstack_linked_list_iterator_remove(&it);
4604                                 btstack_memory_hci_iso_stream_free(iso_stream);
4605                             }
4606                         }
4607                         btstack_linked_list_remove(&hci_stack->le_audio_bigs, (btstack_linked_item_t *) big);
4608                         switch (big->state){
4609                             case LE_AUDIO_BIG_STATE_W4_TERMINATED_AFTER_SETUP_FAILED:
4610                                 hci_emit_big_created(big, big->state_vars.status);
4611                                 break;
4612                             default:
4613                                 hci_emit_big_terminated(big);
4614                                 break;
4615                         }
4616                     }
4617                     break;
4618                 case HCI_SUBEVENT_LE_BIG_SYNC_ESTABLISHED:
4619                     hci_stack->iso_active_operation_type = HCI_ISO_TYPE_INVALID;
4620                     big_sync = hci_big_sync_for_handle(packet[4]);
4621                     if (big_sync != NULL){
4622                         uint8_t status = packet[3];
4623                         if (status == ERROR_CODE_SUCCESS){
4624                             // store bis_con_handles and trigger iso path setup
4625                             uint8_t num_bis = btstack_min(big_sync->num_bis, packet[16]);
4626                             for (i=0;i<num_bis;i++){
4627                                 hci_con_handle_t bis_handle = little_endian_read_16(packet, 17 + (2 * i));
4628                                 big_sync->bis_con_handles[i] = bis_handle;
4629                                 // setup iso_stream_t
4630                                 btstack_linked_list_iterator_init(&it, &hci_stack->iso_streams);
4631                                 while (btstack_linked_list_iterator_has_next(&it)){
4632                                     iso_stream = (hci_iso_stream_t *) btstack_linked_list_iterator_next(&it);
4633                                     if ((iso_stream->state == HCI_ISO_STREAM_STATE_REQUESTED ) &&
4634                                         (iso_stream->group_id == big_sync->big_handle)){
4635                                         iso_stream->cis_handle = bis_handle;
4636                                         iso_stream->state = HCI_ISO_STREAM_STATE_ESTABLISHED;
4637                                         break;
4638                                     }
4639                                 }
4640                             }
4641                             if (big_sync->state == LE_AUDIO_BIG_STATE_W4_ESTABLISHED) {
4642                                 // trigger iso path setup
4643                                 big_sync->state = LE_AUDIO_BIG_STATE_SETUP_ISO_PATH;
4644                                 big_sync->state_vars.next_bis = 0;
4645                             }
4646                         } else {
4647                             // create BIG Sync failed or has been stopped by us
4648                             hci_iso_big_sync_failed(big_sync, status);
4649                         }
4650                     }
4651                     break;
4652                 case HCI_SUBEVENT_LE_BIG_SYNC_LOST:
4653                     hci_stack->iso_active_operation_type = HCI_ISO_TYPE_INVALID;
4654                     big_sync = hci_big_sync_for_handle(packet[4]);
4655                     if (big_sync != NULL){
4656                         uint8_t big_handle = packet[4];
4657                         btstack_linked_list_remove(&hci_stack->le_audio_big_syncs, (btstack_linked_item_t *) big_sync);
4658                         hci_emit_big_sync_stopped(big_handle);
4659                     }
4660                     break;
4661 #endif
4662                 default:
4663                     break;
4664             }
4665             break;
4666 #endif
4667         case HCI_EVENT_VENDOR_SPECIFIC:
4668             // Vendor specific commands often create vendor specific event instead of num completed packets
4669             // To avoid getting stuck as num_cmds_packets is zero, reset it to 1 for controllers with this behaviour
4670             switch (hci_stack->manufacturer){
4671                 case BLUETOOTH_COMPANY_ID_CAMBRIDGE_SILICON_RADIO:
4672                     hci_stack->num_cmd_packets = 1;
4673                     break;
4674                 default:
4675                     break;
4676             }
4677             break;
4678         default:
4679             break;
4680     }
4681 
4682     handle_event_for_current_stack_state(packet, size);
4683 
4684     // notify upper stack
4685 	hci_emit_event(packet, size, 0);   // don't dump, already happened in packet handler
4686 
4687     // moved here to give upper stack a chance to close down everything with hci_connection_t intact
4688     if ((hci_event_packet_get_type(packet) == HCI_EVENT_DISCONNECTION_COMPLETE) && (packet[2] == 0)){
4689 		handle = little_endian_read_16(packet, 3);
4690 		hci_connection_t * aConn = hci_connection_for_handle(handle);
4691 		// discard connection if app did not trigger a reconnect in the event handler
4692 		if (aConn && aConn->state == RECEIVED_DISCONNECTION_COMPLETE){
4693 			hci_shutdown_connection(aConn);
4694 		}
4695 #ifdef ENABLE_CONTROLLER_DUMP_PACKETS
4696         hci_controller_dump_packets();
4697 #endif
4698     }
4699 
4700 	// execute main loop
4701 	hci_run();
4702 }
4703 
4704 #ifdef ENABLE_CLASSIC
4705 
4706 static void sco_handler(uint8_t * packet, uint16_t size){
4707     // lookup connection struct
4708     hci_con_handle_t con_handle = READ_SCO_CONNECTION_HANDLE(packet);
4709     hci_connection_t * conn     = hci_connection_for_handle(con_handle);
4710     if (!conn) return;
4711 
4712 #ifdef ENABLE_SCO_OVER_HCI
4713     // CSR 8811 prefixes 60 byte SCO packet in transparent mode with 20 zero bytes -> skip first 20 payload bytes
4714     if (hci_stack->manufacturer == BLUETOOTH_COMPANY_ID_CAMBRIDGE_SILICON_RADIO){
4715         if ((size == 83) && ((hci_stack->sco_voice_setting_active & 0x03) == 0x03)){
4716             packet[2] = 0x3c;
4717             memmove(&packet[3], &packet[23], 63);
4718             size = 63;
4719         }
4720     }
4721 
4722     if (hci_have_usb_transport()){
4723         // Nothing to do
4724     } else {
4725         // log_debug("sco flow %u, handle 0x%04x, packets sent %u, bytes send %u", hci_stack->synchronous_flow_control_enabled, (int) con_handle, conn->num_packets_sent, conn->num_sco_bytes_sent);
4726         if (hci_stack->synchronous_flow_control_enabled == 0){
4727             // ignore received SCO packets for the first 10 ms, then allow for max two HCI_SCO_2EV3_SIZE packets
4728             uint8_t max_sco_packets = (uint8_t) btstack_min(2 * HCI_SCO_2EV3_SIZE / conn->sco_payload_length, hci_stack->sco_packets_total_num);
4729             if (conn->sco_tx_active == 0){
4730                 if (btstack_time_delta(btstack_run_loop_get_time_ms(), conn->sco_established_ms) > 10){
4731                     conn->sco_tx_active = 1;
4732                     conn->sco_tx_ready = max_sco_packets;
4733                     log_info("Start SCO sending, %u packets", conn->sco_tx_ready);
4734                     hci_notify_if_sco_can_send_now();
4735                 }
4736             } else {
4737                 if (conn->sco_tx_ready < max_sco_packets){
4738                     conn->sco_tx_ready++;
4739                 }
4740                 hci_notify_if_sco_can_send_now();
4741             }
4742         }
4743     }
4744 #endif
4745 
4746     // deliver to app
4747     if (hci_stack->sco_packet_handler) {
4748         hci_stack->sco_packet_handler(HCI_SCO_DATA_PACKET, 0, packet, size);
4749     }
4750 
4751 #ifdef HAVE_SCO_TRANSPORT
4752     // We can send one packet for each received packet
4753     conn->sco_tx_ready++;
4754     hci_notify_if_sco_can_send_now();
4755 #endif
4756 
4757 #ifdef ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL
4758     conn->num_packets_completed++;
4759     hci_stack->host_completed_packets = 1;
4760     hci_run();
4761 #endif
4762 }
4763 #endif
4764 
4765 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){
4766 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
4767     // propagate ISO packets received as ACL
4768     hci_iso_stream_t * iso_stream = NULL;
4769     if ((packet_type == HCI_ACL_DATA_PACKET) && (size >= HCI_ACL_HEADER_SIZE)){
4770         hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet);
4771         iso_stream = hci_iso_stream_for_con_handle(con_handle);
4772         if (iso_stream != NULL){
4773             packet_type = HCI_ISO_DATA_PACKET;
4774         }
4775     }
4776 #endif
4777 
4778     // don't log internal events unless requested
4779     bool internal_event = (packet_type == HCI_EVENT_PACKET) && (hci_event_packet_get_type(packet) >= BTSTACK_EVENT_FIRST);
4780     bool log_packet = internal_event == false;
4781 #ifdef ENABLE_LOG_BTSTACK_EVENTS
4782     log_packet = true;
4783 #endif
4784     if (log_packet){
4785         hci_dump_packet(packet_type, 1, packet, size);
4786     }
4787 
4788     switch (packet_type) {
4789         case HCI_EVENT_PACKET:
4790             event_handler(packet, size);
4791             break;
4792         case HCI_ACL_DATA_PACKET:
4793             acl_handler(packet, size);
4794             break;
4795 #ifdef ENABLE_CLASSIC
4796         case HCI_SCO_DATA_PACKET:
4797             sco_handler(packet, size);
4798             break;
4799 #endif
4800 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
4801         case HCI_ISO_DATA_PACKET:
4802             if ((iso_stream == NULL) && (size >= HCI_ISO_HEADER_SIZE)){
4803                 hci_con_handle_t con_handle = READ_ISO_CONNECTION_HANDLE(packet);
4804                 iso_stream = hci_iso_stream_for_con_handle(con_handle);
4805             }
4806             hci_iso_packet_handler(iso_stream, packet, size);
4807             break;
4808 #endif
4809         default:
4810             break;
4811     }
4812 }
4813 
4814 /**
4815  * @brief Add event packet handler.
4816  */
4817 void hci_add_event_handler(btstack_packet_callback_registration_t * callback_handler){
4818     btstack_linked_list_add_tail(&hci_stack->event_handlers, (btstack_linked_item_t*) callback_handler);
4819 }
4820 
4821 /**
4822  * @brief Remove event packet handler.
4823  */
4824 void hci_remove_event_handler(btstack_packet_callback_registration_t * callback_handler){
4825     btstack_linked_list_remove(&hci_stack->event_handlers, (btstack_linked_item_t*) callback_handler);
4826 }
4827 
4828 /** Register HCI packet handlers */
4829 void hci_register_acl_packet_handler(btstack_packet_handler_t handler){
4830     hci_stack->acl_packet_handler = handler;
4831 }
4832 
4833 #ifdef ENABLE_CLASSIC
4834 /**
4835  * @brief Registers a packet handler for SCO data. Used for HSP and HFP profiles.
4836  */
4837 void hci_register_sco_packet_handler(btstack_packet_handler_t handler){
4838     hci_stack->sco_packet_handler = handler;
4839 }
4840 #endif
4841 
4842 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
4843 void hci_register_iso_packet_handler(btstack_packet_handler_t handler){
4844     hci_stack->iso_packet_handler = handler;
4845 }
4846 #endif
4847 
4848 static void hci_state_reset(void){
4849     // no connections yet
4850     hci_stack->connections = NULL;
4851 
4852     // keep discoverable/connectable as this has been requested by the client(s)
4853     // hci_stack->discoverable = 0;
4854     // hci_stack->connectable = 0;
4855     // hci_stack->bondable = 1;
4856     // hci_stack->own_addr_type = 0;
4857 
4858     // buffer is free
4859     hci_stack->hci_packet_buffer_reserved = false;
4860 
4861     // no pending cmds
4862     hci_stack->decline_reason = 0;
4863 
4864     hci_stack->secure_connections_active = false;
4865 
4866 #ifdef ENABLE_CLASSIC
4867     hci_stack->inquiry_lap = GAP_IAC_GENERAL_INQUIRY;
4868 
4869     hci_stack->gap_tasks_classic =
4870             GAP_TASK_SET_DEFAULT_LINK_POLICY |
4871             GAP_TASK_SET_CLASS_OF_DEVICE |
4872             GAP_TASK_SET_LOCAL_NAME |
4873             GAP_TASK_SET_EIR_DATA |
4874             GAP_TASK_WRITE_SCAN_ENABLE |
4875             GAP_TASK_WRITE_PAGE_TIMEOUT;
4876 #endif
4877 
4878 #ifdef ENABLE_CLASSIC_PAIRING_OOB
4879     hci_stack->classic_read_local_oob_data = false;
4880     hci_stack->classic_oob_con_handle = HCI_CON_HANDLE_INVALID;
4881 #endif
4882 
4883     // LE
4884 #ifdef ENABLE_BLE
4885     memset(hci_stack->le_random_address, 0, 6);
4886     hci_stack->le_random_address_set = 0;
4887 #endif
4888 #ifdef ENABLE_LE_CENTRAL
4889     hci_stack->le_scanning_active  = false;
4890     hci_stack->le_scanning_param_update = true;
4891     hci_stack->le_connecting_state = LE_CONNECTING_IDLE;
4892     hci_stack->le_connecting_request = LE_CONNECTING_IDLE;
4893     hci_stack->le_whitelist_capacity = 0;
4894 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
4895     hci_stack->le_periodic_terminate_sync_handle = HCI_CON_HANDLE_INVALID;
4896 #endif
4897 #endif
4898 #ifdef ENABLE_LE_PERIPHERAL
4899     hci_stack->le_advertisements_state &= ~LE_ADVERTISEMENT_STATE_ACTIVE;
4900     if ((hci_stack->le_advertisements_state & LE_ADVERTISEMENT_STATE_PARAMS_SET) != 0){
4901         hci_stack->le_advertisements_todo |= LE_ADVERTISEMENT_TASKS_SET_PARAMS;
4902     }
4903     if (hci_stack->le_advertisements_data != NULL){
4904         hci_stack->le_advertisements_todo |= LE_ADVERTISEMENT_TASKS_SET_ADV_DATA;
4905     }
4906 #endif
4907 #ifdef ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION
4908     hci_stack->le_resolving_list_state = LE_RESOLVING_LIST_SEND_ENABLE_ADDRESS_RESOLUTION;
4909 #endif
4910 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
4911     hci_stack->iso_active_operation_type = HCI_ISO_TYPE_INVALID;
4912     hci_stack->iso_active_operation_group_id = HCI_ISO_GROUP_ID_INVALID;
4913 #endif
4914 #ifdef ENABLE_HCI_COMMAND_STATUS_DISCARDED_FOR_FAILED_CONNECTIONS_WORKAROUND
4915     hci_stack->hci_command_con_handle = HCI_CON_HANDLE_INVALID;
4916 #endif
4917 }
4918 
4919 #ifdef ENABLE_CLASSIC
4920 /**
4921  * @brief Configure Bluetooth hardware control. Has to be called before power on.
4922  */
4923 void hci_set_link_key_db(btstack_link_key_db_t const * link_key_db){
4924     // store and open remote device db
4925     hci_stack->link_key_db = link_key_db;
4926     if (hci_stack->link_key_db) {
4927         hci_stack->link_key_db->open();
4928     }
4929 }
4930 #endif
4931 
4932 void hci_init(const hci_transport_t *transport, const void *config){
4933 
4934 #ifdef HAVE_MALLOC
4935     if (!hci_stack) {
4936         hci_stack = (hci_stack_t*) malloc(sizeof(hci_stack_t));
4937     }
4938     btstack_assert(hci_stack != NULL);
4939 #else
4940     hci_stack = &hci_stack_static;
4941 #endif
4942     memset(hci_stack, 0, sizeof(hci_stack_t));
4943 
4944     // reference to use transport layer implementation
4945     hci_stack->hci_transport = transport;
4946 
4947     // reference to used config
4948     hci_stack->config = config;
4949 
4950     // setup pointer for outgoing packet buffer
4951     hci_stack->hci_packet_buffer = &hci_stack->hci_packet_buffer_data[HCI_OUTGOING_PRE_BUFFER_SIZE];
4952 
4953     // max acl payload size defined in config.h
4954     hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE;
4955 
4956     // register packet handlers with transport
4957     transport->register_packet_handler(&packet_handler);
4958 
4959     hci_stack->state = HCI_STATE_OFF;
4960 
4961     // class of device
4962     hci_stack->class_of_device = 0x007a020c; // Smartphone
4963 
4964     // bondable by default
4965     hci_stack->bondable = 1;
4966 
4967 #ifdef ENABLE_CLASSIC
4968     // classic name
4969     hci_stack->local_name = default_classic_name;
4970 
4971     // Master slave policy
4972     hci_stack->master_slave_policy = 1;
4973 
4974     // Allow Role Switch
4975     hci_stack->allow_role_switch = 1;
4976 
4977     // Default / minimum security level = 2
4978     hci_stack->gap_security_level = LEVEL_2;
4979 
4980     // Default Security Mode 4
4981     hci_stack->gap_security_mode = GAP_SECURITY_MODE_4;
4982 
4983     // Errata-11838 mandates 7 bytes for GAP Security Level 1-3
4984     hci_stack->gap_required_encyrption_key_size = 7;
4985 
4986     // Link Supervision Timeout
4987     hci_stack->link_supervision_timeout = HCI_LINK_SUPERVISION_TIMEOUT_DEFAULT;
4988 
4989     // Page Timeout
4990     hci_stack->page_timeout = 0x6000;  // ca. 15 sec
4991 
4992     // All ACL packet types are enabled
4993     hci_stack->enabled_packet_types_acl = ACL_PACKET_TYPES_ALL;
4994 #endif
4995 
4996     // Secure Simple Pairing default: enable, no I/O capabilities, general bonding, mitm not required, auto accept
4997     hci_stack->ssp_enable = 1;
4998     hci_stack->ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT;
4999     hci_stack->ssp_authentication_requirement = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING;
5000     hci_stack->ssp_auto_accept = 1;
5001 
5002     // Secure Connections: enable (requires support from Controller)
5003     hci_stack->secure_connections_enable = true;
5004 
5005     // voice setting - signed 16 bit pcm data with CVSD over the air
5006     hci_stack->sco_voice_setting = 0x60;
5007 
5008 #ifdef ENABLE_BLE
5009     hci_stack->le_connection_scan_interval = 0x0060;   //    60 ms
5010     hci_stack->le_connection_scan_window   = 0x0030;    //   30 ms
5011     hci_stack->le_connection_interval_min  = 0x0008;    //   10 ms
5012     hci_stack->le_connection_interval_max  = 0x0018;    //   30 ms
5013     hci_stack->le_connection_latency       =      4;    //    4
5014     hci_stack->le_supervision_timeout      = 0x0048;    //  720 ms
5015     hci_stack->le_minimum_ce_length        =      0;    //    0 ms
5016     hci_stack->le_maximum_ce_length        =      0;    //    0 ms
5017 #endif
5018 
5019 #ifdef ENABLE_LE_CENTRAL
5020     hci_stack->le_connection_phys          =   0x01;    // LE 1M PHY
5021 
5022     // default LE Scanning
5023     hci_stack->le_scan_type     =  0x01; // active
5024     hci_stack->le_scan_interval = 0x1e0; // 300 ms
5025     hci_stack->le_scan_window   =  0x30; //  30 ms
5026     hci_stack->le_scan_phys     =  0x01; // LE 1M PHY
5027 #endif
5028 
5029 #ifdef ENABLE_LE_PERIPHERAL
5030     hci_stack->le_max_number_peripheral_connections = 1; // only single connection as peripheral
5031 
5032     // default advertising parameters from Core v5.4 -- needed to use random address without prior adv setup
5033     hci_stack->le_advertisements_interval_min =                         0x0800;
5034     hci_stack->le_advertisements_interval_max =                         0x0800;
5035     hci_stack->le_advertisements_type =                                      0;
5036     hci_stack->le_own_addr_type =                       BD_ADDR_TYPE_LE_PUBLIC;
5037     hci_stack->le_advertisements_direct_address_type =  BD_ADDR_TYPE_LE_PUBLIC;
5038     hci_stack->le_advertisements_channel_map =                            0x07;
5039     hci_stack->le_advertisements_filter_policy =                             0;
5040 #endif
5041 
5042     // connection parameter range used to answer connection parameter update requests in l2cap
5043     hci_stack->le_connection_parameter_range.le_conn_interval_min =          6;
5044     hci_stack->le_connection_parameter_range.le_conn_interval_max =       3200;
5045     hci_stack->le_connection_parameter_range.le_conn_latency_min =           0;
5046     hci_stack->le_connection_parameter_range.le_conn_latency_max =         500;
5047     hci_stack->le_connection_parameter_range.le_supervision_timeout_min =   10;
5048     hci_stack->le_connection_parameter_range.le_supervision_timeout_max = 3200;
5049 
5050 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
5051     hci_stack->iso_packets_to_queue = 1;
5052 #endif
5053 
5054 #ifdef ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION
5055     hci_stack->le_privacy_mode = LE_PRIVACY_MODE_DEVICE;
5056 #endif
5057 
5058     hci_state_reset();
5059 }
5060 
5061 void hci_deinit(void){
5062     btstack_run_loop_remove_timer(&hci_stack->timeout);
5063 #ifdef HAVE_MALLOC
5064     if (hci_stack) {
5065         free(hci_stack);
5066     }
5067 #endif
5068     hci_stack = NULL;
5069 
5070 #ifdef ENABLE_CLASSIC
5071     disable_l2cap_timeouts = 0;
5072 #endif
5073 }
5074 
5075 /**
5076  * @brief Configure Bluetooth chipset driver. Has to be called before power on, or right after receiving the local version information
5077  */
5078 void hci_set_chipset(const btstack_chipset_t *chipset_driver){
5079     hci_stack->chipset = chipset_driver;
5080 
5081     // reset chipset driver - init is also called on power_up
5082     if (hci_stack->chipset && hci_stack->chipset->init){
5083         hci_stack->chipset->init(hci_stack->config);
5084     }
5085 }
5086 
5087 void hci_enable_custom_pre_init(void){
5088     hci_stack->chipset_pre_init = true;
5089 }
5090 
5091 /**
5092  * @brief Configure Bluetooth hardware control. Has to be called after hci_init() but before power on.
5093  */
5094 void hci_set_control(const btstack_control_t *hardware_control){
5095     // references to used control implementation
5096     hci_stack->control = hardware_control;
5097     // init with transport config
5098     hardware_control->init(hci_stack->config);
5099 }
5100 
5101 static void hci_discard_connections(void){
5102     btstack_linked_list_iterator_t it;
5103     btstack_linked_list_iterator_init(&it, &hci_stack->connections);
5104     while (btstack_linked_list_iterator_has_next(&it)){
5105         // cancel all l2cap connections by emitting disconnection complete before shutdown (free) connection
5106         hci_connection_t * connection = (hci_connection_t*) btstack_linked_list_iterator_next(&it);
5107         hci_emit_disconnection_complete(connection->con_handle, 0x16); // terminated by local host
5108         hci_shutdown_connection(connection);
5109     }
5110 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
5111     while (hci_stack->iso_streams != NULL){
5112         hci_iso_stream_finalize((hci_iso_stream_t *) hci_stack->iso_streams);
5113     }
5114 #endif
5115 }
5116 
5117 void hci_close(void){
5118 
5119 #ifdef ENABLE_CLASSIC
5120     // close remote device db
5121     if (hci_stack->link_key_db) {
5122         hci_stack->link_key_db->close();
5123     }
5124 #endif
5125 
5126     hci_discard_connections();
5127 
5128     hci_power_control(HCI_POWER_OFF);
5129 
5130 #ifdef HAVE_MALLOC
5131     free(hci_stack);
5132 #endif
5133     hci_stack = NULL;
5134 }
5135 
5136 #ifdef HAVE_SCO_TRANSPORT
5137 void hci_set_sco_transport(const btstack_sco_transport_t *sco_transport){
5138     hci_stack->sco_transport = sco_transport;
5139     sco_transport->register_packet_handler(&packet_handler);
5140 }
5141 #endif
5142 
5143 #ifdef ENABLE_CLASSIC
5144 void gap_set_required_encryption_key_size(uint8_t encryption_key_size){
5145     // validate range and set
5146     if (encryption_key_size < 7)  return;
5147     if (encryption_key_size > 16) return;
5148     hci_stack->gap_required_encyrption_key_size = encryption_key_size;
5149 }
5150 
5151 uint8_t gap_set_security_mode(gap_security_mode_t security_mode){
5152     if ((security_mode == GAP_SECURITY_MODE_4) || (security_mode == GAP_SECURITY_MODE_2)){
5153         hci_stack->gap_security_mode = security_mode;
5154         return ERROR_CODE_SUCCESS;
5155     } else {
5156         return ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE;
5157     }
5158 }
5159 
5160 gap_security_mode_t gap_get_security_mode(void){
5161     return hci_stack->gap_security_mode;
5162 }
5163 
5164 void gap_set_security_level(gap_security_level_t security_level){
5165     hci_stack->gap_security_level = security_level;
5166 }
5167 
5168 gap_security_level_t gap_get_security_level(void){
5169     if (hci_stack->gap_secure_connections_only_mode){
5170         return LEVEL_4;
5171     }
5172     return hci_stack->gap_security_level;
5173 }
5174 
5175 void gap_set_minimal_service_security_level(gap_security_level_t security_level){
5176     hci_stack->gap_minimal_service_security_level = security_level;
5177 }
5178 
5179 void gap_set_secure_connections_only_mode(bool enable){
5180     hci_stack->gap_secure_connections_only_mode = enable;
5181 }
5182 
5183 bool gap_get_secure_connections_only_mode(void){
5184     return hci_stack->gap_secure_connections_only_mode;
5185 }
5186 #endif
5187 
5188 #ifdef ENABLE_CLASSIC
5189 void gap_set_class_of_device(uint32_t class_of_device){
5190     hci_stack->class_of_device = class_of_device;
5191     hci_stack->gap_tasks_classic |= GAP_TASK_SET_CLASS_OF_DEVICE;
5192     hci_run();
5193 }
5194 
5195 void gap_set_default_link_policy_settings(uint16_t default_link_policy_settings){
5196     hci_stack->default_link_policy_settings = default_link_policy_settings;
5197     hci_stack->gap_tasks_classic |= GAP_TASK_SET_DEFAULT_LINK_POLICY;
5198     hci_run();
5199 }
5200 
5201 void gap_set_allow_role_switch(bool allow_role_switch){
5202     hci_stack->allow_role_switch = allow_role_switch ? 1 : 0;
5203 }
5204 
5205 uint8_t hci_get_allow_role_switch(void){
5206     return  hci_stack->allow_role_switch;
5207 }
5208 
5209 void gap_set_link_supervision_timeout(uint16_t link_supervision_timeout){
5210     hci_stack->link_supervision_timeout = link_supervision_timeout;
5211 }
5212 
5213 void gap_enable_link_watchdog(uint16_t timeout_ms){
5214     hci_stack->automatic_flush_timeout = btstack_min(timeout_ms, 1280) * 8 / 5; // divide by 0.625
5215 }
5216 
5217 uint16_t hci_automatic_flush_timeout(void){
5218     return hci_stack->automatic_flush_timeout;
5219 }
5220 
5221 void hci_disable_l2cap_timeout_check(void){
5222     disable_l2cap_timeouts = 1;
5223 }
5224 #endif
5225 
5226 #ifndef HAVE_HOST_CONTROLLER_API
5227 // Set Public BD ADDR - passed on to Bluetooth chipset if supported in bt_control_h
5228 void hci_set_bd_addr(bd_addr_t addr){
5229     (void)memcpy(hci_stack->custom_bd_addr, addr, 6);
5230     hci_stack->custom_bd_addr_set = 1;
5231 }
5232 #endif
5233 
5234 // State-Module-Driver overview
5235 // state                    module  low-level
5236 // HCI_STATE_OFF             off      close
5237 // HCI_STATE_INITIALIZING,   on       open
5238 // HCI_STATE_WORKING,        on       open
5239 // HCI_STATE_HALTING,        on       open
5240 // HCI_STATE_SLEEPING,    off/sleep   close
5241 // HCI_STATE_FALLING_ASLEEP  on       open
5242 
5243 static int hci_power_control_on(void){
5244 
5245     // power on
5246     int err = 0;
5247     if (hci_stack->control && hci_stack->control->on){
5248         err = (*hci_stack->control->on)();
5249     }
5250     if (err){
5251         log_error( "POWER_ON failed");
5252         hci_emit_hci_open_failed();
5253         return err;
5254     }
5255 
5256     // int chipset driver
5257     if (hci_stack->chipset && hci_stack->chipset->init){
5258         hci_stack->chipset->init(hci_stack->config);
5259     }
5260 
5261     // init transport
5262     if (hci_stack->hci_transport->init){
5263         hci_stack->hci_transport->init(hci_stack->config);
5264     }
5265 
5266     // open transport
5267     err = hci_stack->hci_transport->open();
5268     if (err){
5269         log_error( "HCI_INIT failed, turning Bluetooth off again");
5270         if (hci_stack->control && hci_stack->control->off){
5271             (*hci_stack->control->off)();
5272         }
5273         hci_emit_hci_open_failed();
5274         return err;
5275     }
5276     return 0;
5277 }
5278 
5279 static void hci_power_control_off(void){
5280 
5281     log_info("hci_power_control_off");
5282 
5283     // close low-level device
5284     hci_stack->hci_transport->close();
5285 
5286     log_info("hci_power_control_off - hci_transport closed");
5287 
5288     // power off
5289     if (hci_stack->control && hci_stack->control->off){
5290         (*hci_stack->control->off)();
5291     }
5292 
5293     log_info("hci_power_control_off - control closed");
5294 
5295     hci_stack->state = HCI_STATE_OFF;
5296 }
5297 
5298 static void hci_power_control_sleep(void){
5299 
5300     log_info("hci_power_control_sleep");
5301 
5302 #if 0
5303     // don't close serial port during sleep
5304 
5305     // close low-level device
5306     hci_stack->hci_transport->close(hci_stack->config);
5307 #endif
5308 
5309     // sleep mode
5310     if (hci_stack->control && hci_stack->control->sleep){
5311         (*hci_stack->control->sleep)();
5312     }
5313 
5314     hci_stack->state = HCI_STATE_SLEEPING;
5315 }
5316 
5317 static int hci_power_control_wake(void){
5318 
5319     log_info("hci_power_control_wake");
5320 
5321     // wake on
5322     if (hci_stack->control && hci_stack->control->wake){
5323         (*hci_stack->control->wake)();
5324     }
5325 
5326 #if 0
5327     // open low-level device
5328     int err = hci_stack->hci_transport->open(hci_stack->config);
5329     if (err){
5330         log_error( "HCI_INIT failed, turning Bluetooth off again");
5331         if (hci_stack->control && hci_stack->control->off){
5332             (*hci_stack->control->off)();
5333         }
5334         hci_emit_hci_open_failed();
5335         return err;
5336     }
5337 #endif
5338 
5339     return 0;
5340 }
5341 
5342 static void hci_power_enter_initializing_state(void){
5343     // set up state machine
5344     hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent
5345     hci_stack->hci_packet_buffer_reserved = false;
5346     hci_stack->state = HCI_STATE_INITIALIZING;
5347 
5348 #ifndef HAVE_HOST_CONTROLLER_API
5349     if (hci_stack->chipset_pre_init) {
5350         hci_stack->substate = HCI_INIT_CUSTOM_PRE_INIT;
5351     } else
5352 #endif
5353     {
5354         hci_stack->substate = HCI_INIT_SEND_RESET;
5355     }
5356 }
5357 
5358 static void hci_power_enter_halting_state(void){
5359 #ifdef ENABLE_BLE
5360     // drop entries scheduled for removal, mark others for re-adding
5361     btstack_linked_list_iterator_t it;
5362     btstack_linked_list_iterator_init(&it, &hci_stack->le_whitelist);
5363     while (btstack_linked_list_iterator_has_next(&it)){
5364         whitelist_entry_t * entry = (whitelist_entry_t*) btstack_linked_list_iterator_next(&it);
5365         if ((entry->state & (LE_WHITELIST_REMOVE_FROM_CONTROLLER | LE_WHITELIST_ADD_TO_CONTROLLER)) == LE_WHITELIST_REMOVE_FROM_CONTROLLER){
5366             btstack_linked_list_iterator_remove(&it);
5367             btstack_memory_whitelist_entry_free(entry);
5368         } else {
5369             entry->state = LE_WHITELIST_ADD_TO_CONTROLLER;
5370         }
5371     }
5372 #ifdef ENABLE_LE_CENTRAL
5373 #ifdef ENABLE_LE_PERIODIC_ADVERTISING
5374     btstack_linked_list_iterator_init(&it, &hci_stack->le_periodic_advertiser_list);
5375     const uint8_t mask = LE_PERIODIC_ADVERTISER_LIST_ENTRY_REMOVE_FROM_CONTROLLER | LE_PERIODIC_ADVERTISER_LIST_ENTRY_REMOVE_FROM_CONTROLLER;
5376     while (btstack_linked_list_iterator_has_next(&it)){
5377         periodic_advertiser_list_entry_t * entry = (periodic_advertiser_list_entry_t*) btstack_linked_list_iterator_next(&it);
5378         if ((entry->state & mask) == LE_PERIODIC_ADVERTISER_LIST_ENTRY_REMOVE_FROM_CONTROLLER) {
5379             btstack_linked_list_iterator_remove(&it);
5380             btstack_memory_periodic_advertiser_list_entry_free(entry);
5381         } else {
5382             entry->state |= LE_PERIODIC_ADVERTISER_LIST_ENTRY_ADD_TO_CONTROLLER;
5383             continue;
5384         }
5385     }
5386 #endif
5387 #endif
5388 #endif
5389     // see hci_run
5390     hci_stack->state = HCI_STATE_HALTING;
5391     hci_stack->substate = HCI_HALTING_CLASSIC_STOP;
5392     // setup watchdog timer for disconnect - only triggers if Controller does not respond anymore
5393     btstack_run_loop_set_timer(&hci_stack->timeout, 1000);
5394     btstack_run_loop_set_timer_handler(&hci_stack->timeout, hci_halting_timeout_handler);
5395     btstack_run_loop_add_timer(&hci_stack->timeout);
5396 }
5397 
5398 // returns error
5399 static int hci_power_control_state_off(HCI_POWER_MODE power_mode){
5400     int err;
5401     switch (power_mode){
5402         case HCI_POWER_ON:
5403             err = hci_power_control_on();
5404             if (err != 0) {
5405                 log_error("hci_power_control_on() error %d", err);
5406                 return err;
5407             }
5408             hci_power_enter_initializing_state();
5409             break;
5410         case HCI_POWER_OFF:
5411             // do nothing
5412             break;
5413         case HCI_POWER_SLEEP:
5414             // do nothing (with SLEEP == OFF)
5415             break;
5416         default:
5417             btstack_assert(false);
5418             break;
5419     }
5420     return ERROR_CODE_SUCCESS;
5421 }
5422 
5423 static int hci_power_control_state_initializing(HCI_POWER_MODE power_mode){
5424     switch (power_mode){
5425         case HCI_POWER_ON:
5426             // do nothing
5427             break;
5428         case HCI_POWER_OFF:
5429             // no connections yet, just turn it off
5430             hci_power_control_off();
5431             break;
5432         case HCI_POWER_SLEEP:
5433             // no connections yet, just turn it off
5434             hci_power_control_sleep();
5435             break;
5436         default:
5437             btstack_assert(false);
5438             break;
5439     }
5440     return ERROR_CODE_SUCCESS;
5441 }
5442 
5443 static int hci_power_control_state_working(HCI_POWER_MODE power_mode) {
5444     switch (power_mode){
5445         case HCI_POWER_ON:
5446             // do nothing
5447             break;
5448         case HCI_POWER_OFF:
5449             hci_power_enter_halting_state();
5450             break;
5451         case HCI_POWER_SLEEP:
5452             // see hci_run
5453             hci_stack->state = HCI_STATE_FALLING_ASLEEP;
5454             hci_stack->substate = HCI_FALLING_ASLEEP_DISCONNECT;
5455             break;
5456         default:
5457             btstack_assert(false);
5458             break;
5459     }
5460     return ERROR_CODE_SUCCESS;
5461 }
5462 
5463 static int hci_power_control_state_halting(HCI_POWER_MODE power_mode) {
5464     switch (power_mode){
5465         case HCI_POWER_ON:
5466             hci_power_enter_initializing_state();
5467             break;
5468         case HCI_POWER_OFF:
5469             // do nothing
5470             break;
5471         case HCI_POWER_SLEEP:
5472             // see hci_run
5473             hci_stack->state = HCI_STATE_FALLING_ASLEEP;
5474             hci_stack->substate = HCI_FALLING_ASLEEP_DISCONNECT;
5475             break;
5476         default:
5477             btstack_assert(false);
5478             break;
5479     }
5480     return ERROR_CODE_SUCCESS;
5481 }
5482 
5483 static int hci_power_control_state_falling_asleep(HCI_POWER_MODE power_mode) {
5484     switch (power_mode){
5485         case HCI_POWER_ON:
5486             hci_power_enter_initializing_state();
5487             break;
5488         case HCI_POWER_OFF:
5489             hci_power_enter_halting_state();
5490             break;
5491         case HCI_POWER_SLEEP:
5492             // do nothing
5493             break;
5494         default:
5495             btstack_assert(false);
5496             break;
5497     }
5498     return ERROR_CODE_SUCCESS;
5499 }
5500 
5501 static int hci_power_control_state_sleeping(HCI_POWER_MODE power_mode) {
5502     int err;
5503     switch (power_mode){
5504         case HCI_POWER_ON:
5505             err = hci_power_control_wake();
5506             if (err) return err;
5507             hci_power_enter_initializing_state();
5508             break;
5509         case HCI_POWER_OFF:
5510             hci_power_enter_halting_state();
5511             break;
5512         case HCI_POWER_SLEEP:
5513             // do nothing
5514             break;
5515         default:
5516             btstack_assert(false);
5517             break;
5518     }
5519     return ERROR_CODE_SUCCESS;
5520 }
5521 
5522 int hci_power_control(HCI_POWER_MODE power_mode){
5523     log_info("hci_power_control: %d, current mode %u", power_mode, hci_stack->state);
5524     btstack_run_loop_remove_timer(&hci_stack->timeout);
5525     int err = 0;
5526     switch (hci_stack->state){
5527         case HCI_STATE_OFF:
5528             err = hci_power_control_state_off(power_mode);
5529             break;
5530         case HCI_STATE_INITIALIZING:
5531             err = hci_power_control_state_initializing(power_mode);
5532             break;
5533         case HCI_STATE_WORKING:
5534             err = hci_power_control_state_working(power_mode);
5535             break;
5536         case HCI_STATE_HALTING:
5537             err = hci_power_control_state_halting(power_mode);
5538             break;
5539         case HCI_STATE_FALLING_ASLEEP:
5540             err = hci_power_control_state_falling_asleep(power_mode);
5541             break;
5542         case HCI_STATE_SLEEPING:
5543             err = hci_power_control_state_sleeping(power_mode);
5544             break;
5545         default:
5546             btstack_assert(false);
5547             break;
5548     }
5549     if (err != 0){
5550         return err;
5551     }
5552 
5553     // create internal event
5554 	hci_emit_state();
5555 
5556 	// trigger next/first action
5557 	hci_run();
5558 
5559     return 0;
5560 }
5561 
5562 
5563 static void hci_halting_run(void) {
5564 
5565     log_info("HCI_STATE_HALTING, substate %x\n", hci_stack->substate);
5566 
5567     hci_connection_t *connection;
5568 #ifdef ENABLE_BLE
5569 #ifdef ENABLE_LE_PERIPHERAL
5570     bool stop_advertisements;
5571 #endif
5572 #endif
5573 
5574     switch (hci_stack->substate) {
5575         case HCI_HALTING_CLASSIC_STOP:
5576 #ifdef ENABLE_CLASSIC
5577             if (!hci_can_send_command_packet_now()) return;
5578 
5579             if (hci_stack->connectable || hci_stack->discoverable){
5580                 hci_stack->substate = HCI_HALTING_LE_ADV_STOP;
5581                 hci_send_cmd(&hci_write_scan_enable, 0);
5582                 return;
5583             }
5584 #endif
5585             /* fall through */
5586 
5587         case HCI_HALTING_LE_ADV_STOP:
5588             hci_stack->substate = HCI_HALTING_LE_ADV_STOP;
5589 
5590 #ifdef ENABLE_BLE
5591 #ifdef ENABLE_LE_PERIPHERAL
5592             if (!hci_can_send_command_packet_now()) return;
5593 
5594             stop_advertisements = (hci_stack->le_advertisements_state & LE_ADVERTISEMENT_STATE_ACTIVE) != 0;
5595 
5596 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
5597             if (hci_le_extended_advertising_supported()){
5598 #ifdef ENABLE_LE_PERIODIC_ADVERTISING
5599                 btstack_linked_list_iterator_t it;
5600                 btstack_linked_list_iterator_init(&it, &hci_stack->le_advertising_sets);
5601                 // stop all periodic advertisements and check if an extended set is active
5602                 while (btstack_linked_list_iterator_has_next(&it)){
5603                     le_advertising_set_t * advertising_set = (le_advertising_set_t*) btstack_linked_list_iterator_next(&it);
5604                     if ((advertising_set->state & LE_ADVERTISEMENT_STATE_PERIODIC_ACTIVE) != 0) {
5605                         advertising_set->state &= ~LE_ADVERTISEMENT_STATE_PERIODIC_ACTIVE;
5606                         hci_send_cmd(&hci_le_set_periodic_advertising_enable, 0, advertising_set->advertising_handle);
5607                         return;
5608                     }
5609                     if ((advertising_set->state & LE_ADVERTISEMENT_STATE_ACTIVE) != 0) {
5610                         stop_advertismenets = true;
5611                         advertising_set->state &= ~LE_ADVERTISEMENT_STATE_ACTIVE;
5612                     }
5613                 }
5614 #endif /* ENABLE_LE_PERIODIC_ADVERTISING */
5615                 if (stop_advertismenets){
5616                     hci_stack->le_advertisements_state &= ~LE_ADVERTISEMENT_STATE_ACTIVE;
5617                     hci_send_cmd(&hci_le_set_extended_advertising_enable, 0, 0, NULL, NULL, NULL);
5618                     return;
5619                 }
5620             } else
5621 #else /* ENABLE_LE_PERIPHERAL */
5622             {
5623                 if (stop_advertisements) {
5624                     hci_stack->le_advertisements_state &= ~LE_ADVERTISEMENT_STATE_ACTIVE;
5625                     hci_send_cmd(&hci_le_set_advertise_enable, 0);
5626                     return;
5627                 }
5628             }
5629 #endif  /* ENABLE_LE_EXTENDED_ADVERTISING*/
5630 #endif  /* ENABLE_LE_PERIPHERAL */
5631 #endif  /* ENABLE_BLE */
5632 
5633             /* fall through */
5634 
5635         case HCI_HALTING_LE_SCAN_STOP:
5636             hci_stack->substate = HCI_HALTING_LE_SCAN_STOP;
5637             if (!hci_can_send_command_packet_now()) return;
5638 
5639 #ifdef ENABLE_BLE
5640 #ifdef ENABLE_LE_CENTRAL
5641             if (hci_stack->le_scanning_active){
5642                 hci_le_scan_stop();
5643                 hci_stack->substate = HCI_HALTING_DISCONNECT_ALL;
5644                 return;
5645             }
5646 #endif
5647 #endif
5648 
5649             /* fall through */
5650 
5651         case HCI_HALTING_DISCONNECT_ALL:
5652             hci_stack->substate = HCI_HALTING_DISCONNECT_ALL;
5653             if (!hci_can_send_command_packet_now()) return;
5654 
5655             // close all open connections
5656             connection = (hci_connection_t *) hci_stack->connections;
5657             if (connection) {
5658                 hci_con_handle_t con_handle = (uint16_t) connection->con_handle;
5659 
5660                 log_info("HCI_STATE_HALTING, connection %p, handle %u, state %u", connection, con_handle, connection->state);
5661 
5662                 // check state
5663                 switch(connection->state) {
5664                     case SENT_DISCONNECT:
5665                     case RECEIVED_DISCONNECTION_COMPLETE:
5666                         // wait until connection is gone
5667                         return;
5668                     default:
5669                         break;
5670                 }
5671 
5672                 // finally, send the disconnect command
5673                 connection->state = SENT_DISCONNECT;
5674                 hci_send_cmd(&hci_disconnect, con_handle, ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION);
5675                 return;
5676             }
5677 
5678 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
5679             // stop BIGs and BIG Syncs
5680             if (hci_stack->le_audio_bigs != NULL){
5681                 le_audio_big_t * big = (le_audio_big_t*) hci_stack->le_audio_bigs;
5682                 if (big->state == LE_AUDIO_BIG_STATE_W4_TERMINATED) return;
5683                 big->state = LE_AUDIO_BIG_STATE_W4_TERMINATED;
5684                 hci_send_cmd(&hci_le_terminate_big, big->big_handle);
5685                 return;
5686             }
5687             if (hci_stack->le_audio_big_syncs != NULL){
5688                 le_audio_big_sync_t * big_sync = (le_audio_big_sync_t*) hci_stack->le_audio_big_syncs;
5689                 if (big_sync->state == LE_AUDIO_BIG_STATE_W4_TERMINATED) return;
5690                 big_sync->state = LE_AUDIO_BIG_STATE_W4_TERMINATED;
5691                 hci_send_cmd(&hci_le_big_terminate_sync, big_sync->big_handle);
5692                 return;
5693             }
5694 #endif
5695 
5696             btstack_run_loop_remove_timer(&hci_stack->timeout);
5697 
5698             // no connections left, wait a bit to assert that btstack_crypto isn't waiting for an HCI event
5699             log_info("HCI_STATE_HALTING: wait 50 ms");
5700             hci_stack->substate = HCI_HALTING_W4_CLOSE_TIMER;
5701             btstack_run_loop_set_timer(&hci_stack->timeout, 50);
5702             btstack_run_loop_set_timer_handler(&hci_stack->timeout, hci_halting_timeout_handler);
5703             btstack_run_loop_add_timer(&hci_stack->timeout);
5704             break;
5705 
5706         case HCI_HALTING_W4_CLOSE_TIMER:
5707             // keep waiting
5708             break;
5709 
5710         case HCI_HALTING_CLOSE:
5711             // close left over connections (that had not been properly closed before)
5712             hci_stack->substate = HCI_HALTING_CLOSE_DISCARDING_CONNECTIONS;
5713             hci_discard_connections();
5714 
5715             log_info("HCI_STATE_HALTING, calling off");
5716 
5717             // switch mode
5718             hci_power_control_off();
5719 
5720             log_info("HCI_STATE_HALTING, emitting state");
5721             hci_emit_state();
5722             log_info("HCI_STATE_HALTING, done");
5723             break;
5724 
5725         default:
5726             break;
5727     }
5728 };
5729 
5730 static void hci_falling_asleep_run(void){
5731     hci_connection_t * connection;
5732     switch(hci_stack->substate) {
5733         case HCI_FALLING_ASLEEP_DISCONNECT:
5734             log_info("HCI_STATE_FALLING_ASLEEP");
5735             // close all open connections
5736             connection =  (hci_connection_t *) hci_stack->connections;
5737             if (connection){
5738 
5739                 // send disconnect
5740                 if (!hci_can_send_command_packet_now()) return;
5741 
5742                 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u", connection, (uint16_t)connection->con_handle);
5743                 hci_send_cmd(&hci_disconnect, connection->con_handle, ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION);
5744 
5745                 // send disconnected event right away - causes higher layer connections to get closed, too.
5746                 hci_shutdown_connection(connection);
5747                 return;
5748             }
5749 
5750             if (hci_classic_supported()){
5751                 // disable page and inquiry scan
5752                 if (!hci_can_send_command_packet_now()) return;
5753 
5754                 log_info("HCI_STATE_HALTING, disabling inq scans");
5755                 hci_send_cmd(&hci_write_scan_enable, hci_stack->connectable << 1); // drop inquiry scan but keep page scan
5756 
5757                 // continue in next substate
5758                 hci_stack->substate = HCI_FALLING_ASLEEP_W4_WRITE_SCAN_ENABLE;
5759                 break;
5760             }
5761 
5762             /* fall through */
5763 
5764             case HCI_FALLING_ASLEEP_COMPLETE:
5765                 log_info("HCI_STATE_HALTING, calling sleep");
5766                 // switch mode
5767                 hci_power_control_sleep();  // changes hci_stack->state to SLEEP
5768                 hci_emit_state();
5769                 break;
5770 
5771                 default:
5772                     break;
5773     }
5774 }
5775 
5776 #ifdef ENABLE_CLASSIC
5777 
5778 static void hci_update_scan_enable(void){
5779     // 2 = page scan, 1 = inq scan
5780     hci_stack->new_scan_enable_value  = (hci_stack->connectable << 1) | hci_stack->discoverable;
5781     hci_stack->gap_tasks_classic |= GAP_TASK_WRITE_SCAN_ENABLE;
5782     hci_run();
5783 }
5784 
5785 void gap_discoverable_control(uint8_t enable){
5786     if (enable) enable = 1; // normalize argument
5787 
5788     if (hci_stack->discoverable == enable){
5789         hci_emit_scan_mode_changed(hci_stack->discoverable, hci_stack->connectable);
5790         return;
5791     }
5792 
5793     hci_stack->discoverable = enable;
5794     hci_update_scan_enable();
5795 }
5796 
5797 void gap_connectable_control(uint8_t enable){
5798     if (enable) enable = 1; // normalize argument
5799 
5800     // don't emit event
5801     if (hci_stack->connectable == enable) return;
5802 
5803     hci_stack->connectable = enable;
5804     hci_update_scan_enable();
5805 }
5806 #endif
5807 
5808 void gap_local_bd_addr(bd_addr_t address_buffer){
5809     (void)memcpy(address_buffer, hci_stack->local_bd_addr, 6);
5810 }
5811 
5812 #ifdef ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL
5813 static void hci_host_num_completed_packets(void){
5814 
5815     // create packet manually as arrays are not supported and num_commands should not get reduced
5816     hci_reserve_packet_buffer();
5817     uint8_t * packet = hci_get_outgoing_packet_buffer();
5818 
5819     uint16_t size = 0;
5820     uint16_t num_handles = 0;
5821     packet[size++] = 0x35;
5822     packet[size++] = 0x0c;
5823     size++;  // skip param len
5824     size++;  // skip num handles
5825 
5826     // add { handle, packets } entries
5827     btstack_linked_item_t * it;
5828     for (it = (btstack_linked_item_t *) hci_stack->connections; it ; it = it->next){
5829         hci_connection_t * connection = (hci_connection_t *) it;
5830         if (connection->num_packets_completed){
5831             little_endian_store_16(packet, size, connection->con_handle);
5832             size += 2;
5833             little_endian_store_16(packet, size, connection->num_packets_completed);
5834             size += 2;
5835             //
5836             num_handles++;
5837             connection->num_packets_completed = 0;
5838         }
5839     }
5840 
5841     packet[2] = size - 3;
5842     packet[3] = num_handles;
5843 
5844     hci_stack->host_completed_packets = 0;
5845 
5846     hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, packet, size);
5847     hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size);
5848 
5849     // release packet buffer for synchronous transport implementations
5850     if (hci_transport_synchronous()){
5851         hci_release_packet_buffer();
5852         hci_emit_transport_packet_sent();
5853     }
5854 }
5855 #endif
5856 
5857 static void hci_halting_timeout_handler(btstack_timer_source_t * ds){
5858     UNUSED(ds);
5859     hci_stack->substate = HCI_HALTING_CLOSE;
5860     hci_halting_run();
5861 }
5862 
5863 static bool hci_run_acl_fragments(void){
5864     if (hci_stack->acl_fragmentation_total_size > 0u) {
5865         hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(hci_stack->hci_packet_buffer);
5866         hci_connection_t *connection = hci_connection_for_handle(con_handle);
5867         if (connection) {
5868             if (hci_can_send_prepared_acl_packet_now(con_handle)){
5869                 hci_send_acl_packet_fragments(connection);
5870                 return true;
5871             }
5872         } else {
5873             // connection gone -> discard further fragments
5874             log_info("hci_run: fragmented ACL packet no connection -> discard fragment");
5875             hci_stack->acl_fragmentation_total_size = 0;
5876             hci_stack->acl_fragmentation_pos = 0;
5877         }
5878     }
5879     return false;
5880 }
5881 
5882 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
5883 static bool hci_run_iso_fragments(void){
5884     if (hci_stack->iso_fragmentation_total_size > 0u) {
5885         // TODO: flow control
5886         if (hci_transport_can_send_prepared_packet_now(HCI_ISO_DATA_PACKET)){
5887             hci_send_iso_packet_fragments();
5888             return true;
5889         }
5890     }
5891     return false;
5892 }
5893 #endif
5894 
5895 #ifdef ENABLE_CLASSIC
5896 
5897 #ifdef ENABLE_HCI_SERIALIZED_CONTROLLER_OPERATIONS
5898 static bool hci_classic_operation_active(void) {
5899     if (hci_stack->inquiry_state >= GAP_INQUIRY_STATE_W4_ACTIVE){
5900         return true;
5901     }
5902     if (hci_stack->remote_name_state == GAP_REMOTE_NAME_STATE_W4_COMPLETE){
5903         return true;
5904     }
5905     btstack_linked_item_t * it;
5906     for (it = (btstack_linked_item_t *) hci_stack->connections; it != NULL; it = it->next) {
5907         hci_connection_t *connection = (hci_connection_t *) it;
5908         switch (connection->state) {
5909             case SENT_CREATE_CONNECTION:
5910             case SENT_CANCEL_CONNECTION:
5911             case SENT_DISCONNECT:
5912                 return true;
5913             default:
5914                 break;
5915         }
5916     }
5917     return false;
5918 }
5919 #endif
5920 
5921 static bool hci_run_general_gap_classic(void){
5922 
5923     // assert stack is working and classic is active
5924     if (hci_classic_supported() == false)      return false;
5925     if (hci_stack->state != HCI_STATE_WORKING) return false;
5926 
5927     // decline incoming connections
5928     if (hci_stack->decline_reason){
5929         uint8_t reason = hci_stack->decline_reason;
5930         hci_stack->decline_reason = 0;
5931         hci_send_cmd(&hci_reject_connection_request, hci_stack->decline_addr, reason);
5932         return true;
5933     }
5934 
5935     if (hci_stack->gap_tasks_classic != 0){
5936         hci_run_gap_tasks_classic();
5937         return true;
5938     }
5939 
5940     // start/stop inquiry
5941     if ((hci_stack->inquiry_state >= GAP_INQUIRY_DURATION_MIN) && (hci_stack->inquiry_state <= GAP_INQUIRY_DURATION_MAX)){
5942 #ifdef ENABLE_HCI_SERIALIZED_CONTROLLER_OPERATIONS
5943         if (hci_classic_operation_active() == false)
5944 #endif
5945         {
5946             uint8_t duration = hci_stack->inquiry_state;
5947             hci_stack->inquiry_state = GAP_INQUIRY_STATE_W4_ACTIVE;
5948             if (hci_stack->inquiry_max_period_length != 0){
5949                 hci_send_cmd(&hci_periodic_inquiry_mode, hci_stack->inquiry_max_period_length, hci_stack->inquiry_min_period_length, hci_stack->inquiry_lap, duration, 0);
5950             } else {
5951                 hci_send_cmd(&hci_inquiry, hci_stack->inquiry_lap, duration, 0);
5952             }
5953             return true;
5954         }
5955     }
5956     if (hci_stack->inquiry_state == GAP_INQUIRY_STATE_W2_CANCEL){
5957         hci_stack->inquiry_state = GAP_INQUIRY_STATE_W4_CANCELLED;
5958         hci_send_cmd(&hci_inquiry_cancel);
5959         return true;
5960     }
5961 
5962     if (hci_stack->inquiry_state == GAP_INQUIRY_STATE_W2_EXIT_PERIODIC){
5963         hci_stack->inquiry_state = GAP_INQUIRY_STATE_W4_CANCELLED;
5964         hci_send_cmd(&hci_exit_periodic_inquiry_mode);
5965         return true;
5966     }
5967 
5968     // remote name request
5969     if (hci_stack->remote_name_state == GAP_REMOTE_NAME_STATE_W2_SEND){
5970 #ifdef ENABLE_HCI_SERIALIZED_CONTROLLER_OPERATIONS
5971         if (hci_classic_operation_active() == false)
5972 #endif
5973         {
5974             hci_stack->remote_name_state = GAP_REMOTE_NAME_STATE_W4_COMPLETE;
5975             hci_send_cmd(&hci_remote_name_request, hci_stack->remote_name_addr,
5976                          hci_stack->remote_name_page_scan_repetition_mode, 0, hci_stack->remote_name_clock_offset);
5977             return true;
5978         }
5979     }
5980 #ifdef ENABLE_CLASSIC_PAIRING_OOB
5981     // Local OOB data
5982     if (hci_stack->classic_read_local_oob_data){
5983         hci_stack->classic_read_local_oob_data = false;
5984         if (hci_command_supported(SUPPORTED_HCI_COMMAND_READ_LOCAL_OOB_EXTENDED_DATA_COMMAND)){
5985             hci_send_cmd(&hci_read_local_extended_oob_data);
5986         } else {
5987             hci_send_cmd(&hci_read_local_oob_data);
5988         }
5989     }
5990 #endif
5991     // pairing
5992     if (hci_stack->gap_pairing_state != GAP_PAIRING_STATE_IDLE){
5993         uint8_t state = hci_stack->gap_pairing_state;
5994         uint8_t pin_code[PIN_CODE_LEN];
5995         switch (state){
5996             case GAP_PAIRING_STATE_SEND_PIN:
5997                 hci_stack->gap_pairing_state = GAP_PAIRING_STATE_IDLE;
5998                 memset(pin_code, 0, 16);
5999                 memcpy(pin_code, hci_stack->gap_pairing_input.gap_pairing_pin, hci_stack->gap_pairing_pin_len);
6000                 hci_send_cmd(&hci_pin_code_request_reply, hci_stack->gap_pairing_addr, hci_stack->gap_pairing_pin_len, pin_code);
6001                 break;
6002             case GAP_PAIRING_STATE_SEND_PIN_NEGATIVE:
6003                 hci_stack->gap_pairing_state = GAP_PAIRING_STATE_WAIT_FOR_COMMAND_COMPLETE;
6004                 hci_send_cmd(&hci_pin_code_request_negative_reply, hci_stack->gap_pairing_addr);
6005                 break;
6006             case GAP_PAIRING_STATE_SEND_PASSKEY:
6007                 hci_stack->gap_pairing_state = GAP_PAIRING_STATE_IDLE;
6008                 hci_send_cmd(&hci_user_passkey_request_reply, hci_stack->gap_pairing_addr, hci_stack->gap_pairing_input.gap_pairing_passkey);
6009                 break;
6010             case GAP_PAIRING_STATE_SEND_PASSKEY_NEGATIVE:
6011                 hci_stack->gap_pairing_state = GAP_PAIRING_STATE_WAIT_FOR_COMMAND_COMPLETE;
6012                 hci_send_cmd(&hci_user_passkey_request_negative_reply, hci_stack->gap_pairing_addr);
6013                 break;
6014             case GAP_PAIRING_STATE_SEND_CONFIRMATION:
6015                 hci_stack->gap_pairing_state = GAP_PAIRING_STATE_IDLE;
6016                 hci_send_cmd(&hci_user_confirmation_request_reply, hci_stack->gap_pairing_addr);
6017                 break;
6018             case GAP_PAIRING_STATE_SEND_CONFIRMATION_NEGATIVE:
6019                 hci_stack->gap_pairing_state = GAP_PAIRING_STATE_WAIT_FOR_COMMAND_COMPLETE;
6020                 hci_send_cmd(&hci_user_confirmation_request_negative_reply, hci_stack->gap_pairing_addr);
6021                 break;
6022             default:
6023                 break;
6024         }
6025         return true;
6026     }
6027     return false;
6028 }
6029 #endif
6030 
6031 #ifdef ENABLE_BLE
6032 
6033 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6034 static uint8_t hci_le_num_phys(uint8_t phys){
6035     const uint8_t num_bits_set[] = { 0, 1, 1, 2, 1, 2, 2, 3 };
6036     btstack_assert(phys);
6037     return num_bits_set[phys];
6038 }
6039 #endif
6040 
6041 #ifdef ENABLE_LE_CENTRAL
6042 static void hci_le_scan_stop(void){
6043 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6044     if (hci_le_extended_advertising_supported()) {
6045             hci_send_cmd(&hci_le_set_extended_scan_enable, 0, 0, 0, 0);
6046     } else
6047 #endif
6048     {
6049         hci_send_cmd(&hci_le_set_scan_enable, 0, 0);
6050     }
6051 }
6052 
6053 static void
6054 hci_send_le_create_connection(uint8_t initiator_filter_policy, bd_addr_type_t address_type, uint8_t *address) {
6055 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6056     if (hci_le_extended_advertising_supported()) {
6057         // prepare arrays for all phys (LE Coded, LE 1M, LE 2M PHY)
6058         uint16_t le_connection_scan_interval[3];
6059         uint16_t le_connection_scan_window[3];
6060         uint16_t le_connection_interval_min[3];
6061         uint16_t le_connection_interval_max[3];
6062         uint16_t le_connection_latency[3];
6063         uint16_t le_supervision_timeout[3];
6064         uint16_t le_minimum_ce_length[3];
6065         uint16_t le_maximum_ce_length[3];
6066 
6067         uint8_t i;
6068         uint8_t num_phys = hci_le_num_phys(hci_stack->le_connection_phys);
6069         for (i=0;i<num_phys;i++){
6070             le_connection_scan_interval[i] = hci_stack->le_connection_scan_interval;
6071             le_connection_scan_window[i]   = hci_stack->le_connection_scan_window;
6072             le_connection_interval_min[i]  = hci_stack->le_connection_interval_min;
6073             le_connection_interval_max[i]  = hci_stack->le_connection_interval_max;
6074             le_connection_latency[i]       = hci_stack->le_connection_latency;
6075             le_supervision_timeout[i]      = hci_stack->le_supervision_timeout;
6076             le_minimum_ce_length[i]        = hci_stack->le_minimum_ce_length;
6077             le_maximum_ce_length[i]        = hci_stack->le_maximum_ce_length;
6078         }
6079         hci_send_cmd(&hci_le_extended_create_connection,
6080                      initiator_filter_policy,
6081                      hci_stack->le_connection_own_addr_type,   // our addr type:
6082                      address_type,                  // peer address type
6083                      address,                       // peer bd addr
6084                      hci_stack->le_connection_phys, // initiating PHY
6085                      le_connection_scan_interval,   // conn scan interval
6086                      le_connection_scan_window,     // conn scan windows
6087                      le_connection_interval_min,    // conn interval min
6088                      le_connection_interval_max,    // conn interval max
6089                      le_connection_latency,         // conn latency
6090                      le_supervision_timeout,        // conn latency
6091                      le_minimum_ce_length,          // min ce length
6092                      le_maximum_ce_length           // max ce length
6093         );
6094     } else
6095 #endif
6096     {
6097         hci_send_cmd(&hci_le_create_connection,
6098                      hci_stack->le_connection_scan_interval,  // conn scan interval
6099                      hci_stack->le_connection_scan_window,    // conn scan windows
6100                      initiator_filter_policy,                 // don't use whitelist
6101                      address_type,                            // peer address type
6102                      address,                                 // peer bd addr
6103                      hci_stack->le_connection_own_addr_type,  // our addr type:
6104                      hci_stack->le_connection_interval_min,   // conn interval min
6105                      hci_stack->le_connection_interval_max,   // conn interval max
6106                      hci_stack->le_connection_latency,        // conn latency
6107                      hci_stack->le_supervision_timeout,       // conn latency
6108                      hci_stack->le_minimum_ce_length,         // min ce length
6109                      hci_stack->le_maximum_ce_length          // max ce length
6110         );
6111     }
6112 }
6113 #endif
6114 
6115 #ifdef ENABLE_LE_PERIPHERAL
6116 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6117 static uint8_t hci_le_extended_advertising_operation_for_chunk(uint16_t pos, uint16_t len){
6118     uint8_t  operation = 0;
6119     if (pos == 0){
6120         // first fragment or complete data
6121         operation |= 1;
6122     }
6123     if (pos + LE_EXTENDED_ADVERTISING_MAX_CHUNK_LEN >= len){
6124         // last fragment or complete data
6125         operation |= 2;
6126     }
6127     return operation;
6128 }
6129 #endif
6130 #endif
6131 
6132 static bool hci_whitelist_modification_pending(void) {
6133     btstack_linked_list_iterator_t it;
6134     btstack_linked_list_iterator_init(&it, &hci_stack->le_whitelist);
6135     while (btstack_linked_list_iterator_has_next(&it)){
6136         whitelist_entry_t * entry = (whitelist_entry_t*) btstack_linked_list_iterator_next(&it);
6137         if (entry->state & (LE_WHITELIST_REMOVE_FROM_CONTROLLER | LE_WHITELIST_ADD_TO_CONTROLLER)){
6138             return true;
6139         }
6140     }
6141     return false;
6142 }
6143 
6144 static bool hci_whitelist_modification_process(void){
6145     // add/remove entries
6146     btstack_linked_list_iterator_t it;
6147     btstack_linked_list_iterator_init(&it, &hci_stack->le_whitelist);
6148     while (btstack_linked_list_iterator_has_next(&it)){
6149         whitelist_entry_t * entry = (whitelist_entry_t*) btstack_linked_list_iterator_next(&it);
6150         if (entry->state & LE_WHITELIST_REMOVE_FROM_CONTROLLER){
6151             entry->state &= ~LE_WHITELIST_REMOVE_FROM_CONTROLLER;
6152             entry->state &= ~LE_WHITELIST_ON_CONTROLLER;
6153             bd_addr_type_t address_type = entry->address_type;
6154             bd_addr_t address;
6155             memcpy(address, entry->address, 6);
6156             if ((entry->state & LE_WHITELIST_ADD_TO_CONTROLLER) == 0){
6157                 // remove from whitelist if not scheduled for re-addition
6158                 btstack_linked_list_remove(&hci_stack->le_whitelist, (btstack_linked_item_t *) entry);
6159                 btstack_memory_whitelist_entry_free(entry);
6160             }
6161             hci_send_cmd(&hci_le_remove_device_from_white_list, address_type, address);
6162             return true;
6163         }
6164         if (entry->state & LE_WHITELIST_ADD_TO_CONTROLLER){
6165             entry->state &= ~LE_WHITELIST_ADD_TO_CONTROLLER;
6166             entry->state |= LE_WHITELIST_ON_CONTROLLER;
6167             hci_send_cmd(&hci_le_add_device_to_white_list, entry->address_type, entry->address);
6168             return true;
6169         }
6170     }
6171     return false;
6172 }
6173 
6174 static bool hci_run_general_gap_le(void){
6175 
6176     btstack_linked_list_iterator_t lit;
6177     UNUSED(lit);
6178 
6179 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6180     if (hci_stack->le_resolvable_private_address_update_s > 0){
6181         uint16_t update_s = hci_stack->le_resolvable_private_address_update_s;
6182         hci_stack->le_resolvable_private_address_update_s = 0;
6183         hci_send_cmd(&hci_le_set_resolvable_private_address_timeout, update_s);
6184         return true;
6185     }
6186 #endif
6187 
6188     // Phase 1: collect what to stop
6189 
6190 #ifdef ENABLE_LE_CENTRAL
6191     bool scanning_stop = false;
6192     bool connecting_stop = false;
6193 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6194 #ifdef ENABLE_LE_PERIODIC_ADVERTISING
6195     bool periodic_sync_stop = false;
6196 #endif
6197 #endif
6198 #endif
6199 
6200 #ifdef ENABLE_LE_PERIPHERAL
6201     bool advertising_stop = false;
6202 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6203     le_advertising_set_t * advertising_stop_set = NULL;
6204 #ifdef ENABLE_LE_PERIODIC_ADVERTISING
6205     bool periodic_advertising_stop = false;
6206 #endif
6207 #endif
6208 #endif
6209 
6210     // check if own address changes
6211     uint8_t address_change_mask = LE_ADVERTISEMENT_TASKS_SET_ADDRESS | LE_ADVERTISEMENT_TASKS_SET_ADDRESS_SET_0;
6212     bool random_address_change = (hci_stack->le_advertisements_todo & address_change_mask) != 0;
6213 
6214     // check if whitelist needs modification
6215     bool  whitelist_modification_pending = hci_whitelist_modification_pending();
6216 
6217     // check if resolving list needs modification
6218     bool resolving_list_modification_pending = false;
6219 #ifdef ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION
6220     bool resolving_list_supported = hci_command_supported(SUPPORTED_HCI_COMMAND_LE_SET_ADDRESS_RESOLUTION_ENABLE);
6221 	if (resolving_list_supported && hci_stack->le_resolving_list_state != LE_RESOLVING_LIST_DONE){
6222         resolving_list_modification_pending = true;
6223     }
6224 #endif
6225 
6226 #ifdef ENABLE_LE_CENTRAL
6227 
6228 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6229     // check if periodic advertiser list needs modification
6230     bool periodic_list_modification_pending = false;
6231     btstack_linked_list_iterator_init(&lit, &hci_stack->le_periodic_advertiser_list);
6232     while (btstack_linked_list_iterator_has_next(&lit)){
6233         periodic_advertiser_list_entry_t * entry = (periodic_advertiser_list_entry_t*) btstack_linked_list_iterator_next(&lit);
6234         if (entry->state & (LE_PERIODIC_ADVERTISER_LIST_ENTRY_ADD_TO_CONTROLLER | LE_PERIODIC_ADVERTISER_LIST_ENTRY_REMOVE_FROM_CONTROLLER)){
6235             periodic_list_modification_pending = true;
6236             break;
6237         }
6238     }
6239 #endif
6240 
6241     // scanning control
6242     if (hci_stack->le_scanning_active) {
6243         // stop if:
6244         // - parameter change required
6245         // - it's disabled
6246         // - whitelist change required but used for scanning
6247         // - resolving list modified
6248         // - own address changes
6249         bool scanning_uses_whitelist = (hci_stack->le_scan_filter_policy & 1) == 1;
6250         if ((hci_stack->le_scanning_param_update) ||
6251             !hci_stack->le_scanning_enabled ||
6252             (scanning_uses_whitelist && whitelist_modification_pending) ||
6253             resolving_list_modification_pending ||
6254             random_address_change){
6255 
6256             scanning_stop = true;
6257         }
6258     }
6259 
6260     // connecting control
6261     bool connecting_with_whitelist;
6262     switch (hci_stack->le_connecting_state){
6263         case LE_CONNECTING_DIRECT:
6264         case LE_CONNECTING_WHITELIST:
6265             // stop connecting if:
6266             // - connecting uses white and whitelist modification pending
6267             // - if it got disabled
6268             // - resolving list modified
6269             // - own address changes
6270             connecting_with_whitelist = hci_stack->le_connecting_state == LE_CONNECTING_WHITELIST;
6271             if ((connecting_with_whitelist && whitelist_modification_pending) ||
6272                 (hci_stack->le_connecting_request == LE_CONNECTING_IDLE) ||
6273                 resolving_list_modification_pending ||
6274                 random_address_change) {
6275 
6276                 connecting_stop = true;
6277             }
6278             break;
6279         default:
6280             break;
6281     }
6282 
6283 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6284 #ifdef ENABLE_LE_PERIODIC_ADVERTISING
6285     // periodic sync control
6286     bool sync_with_advertiser_list;
6287     switch(hci_stack->le_periodic_sync_state){
6288         case LE_CONNECTING_DIRECT:
6289         case LE_CONNECTING_WHITELIST:
6290             // stop sync if:
6291             // - sync with advertiser list and advertiser list modification pending
6292             // - if it got disabled
6293             sync_with_advertiser_list = hci_stack->le_periodic_sync_state == LE_CONNECTING_WHITELIST;
6294             if ((sync_with_advertiser_list && periodic_list_modification_pending) ||
6295                     (hci_stack->le_periodic_sync_request == LE_CONNECTING_IDLE)){
6296                 periodic_sync_stop = true;
6297             }
6298             break;
6299         default:
6300             break;
6301     }
6302 #endif
6303 #endif
6304 
6305 #endif /* ENABLE_LE_CENTRAL */
6306 
6307 #ifdef ENABLE_LE_PERIPHERAL
6308     // le advertisement control
6309     if ((hci_stack->le_advertisements_state & LE_ADVERTISEMENT_STATE_ACTIVE) != 0){
6310         // stop if:
6311         // - parameter change required
6312         // - random address used in advertising and changes
6313         // - it's disabled
6314         // - whitelist change required but used for advertisement filter policy
6315         // - resolving list modified
6316         // - own address changes
6317         bool advertising_uses_whitelist = hci_stack->le_advertisements_filter_policy != 0;
6318         bool advertising_uses_random_address = hci_stack->le_own_addr_type != BD_ADDR_TYPE_LE_PUBLIC;
6319         bool advertising_change    = (hci_stack->le_advertisements_todo & LE_ADVERTISEMENT_TASKS_SET_PARAMS)  != 0;
6320         if (advertising_change ||
6321             (advertising_uses_random_address && random_address_change) ||
6322             (hci_stack->le_advertisements_enabled_for_current_roles == 0) ||
6323             (advertising_uses_whitelist && whitelist_modification_pending) ||
6324             resolving_list_modification_pending ||
6325             random_address_change) {
6326 
6327             advertising_stop = true;
6328         }
6329     }
6330 
6331 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6332     if (hci_le_extended_advertising_supported() && (advertising_stop == false)){
6333         btstack_linked_list_iterator_t it;
6334         btstack_linked_list_iterator_init(&it, &hci_stack->le_advertising_sets);
6335         while (btstack_linked_list_iterator_has_next(&it)){
6336             le_advertising_set_t * advertising_set = (le_advertising_set_t*) btstack_linked_list_iterator_next(&it);
6337             if ((advertising_set->state & LE_ADVERTISEMENT_STATE_ACTIVE) != 0) {
6338                 // stop if:
6339                 // - parameter change required
6340                 // - random address used in connectable advertising and changes
6341                 // - it's disabled
6342                 // - whitelist change required but used for advertisement filter policy
6343                 // - resolving list modified
6344                 // - own address changes
6345                 // - advertisement set will be removed
6346                 bool advertising_uses_whitelist = advertising_set->extended_params.advertising_filter_policy != 0;
6347                 bool advertising_connectable = (advertising_set->extended_params.advertising_event_properties & 1) != 0;
6348                 bool advertising_uses_random_address =
6349                         (advertising_set->extended_params.own_address_type != BD_ADDR_TYPE_LE_PUBLIC) &&
6350                         advertising_connectable;
6351                 bool advertising_parameter_change = (advertising_set->tasks & LE_ADVERTISEMENT_TASKS_SET_PARAMS) != 0;
6352                 bool advertising_enabled = (advertising_set->state & LE_ADVERTISEMENT_STATE_ENABLED) != 0;
6353                 bool advertising_set_random_address_change =
6354                         (advertising_set->tasks & LE_ADVERTISEMENT_TASKS_SET_ADDRESS) != 0;
6355                 bool advertising_set_will_be_removed =
6356                         (advertising_set->state & LE_ADVERTISEMENT_TASKS_REMOVE_SET) != 0;
6357                 if (advertising_parameter_change ||
6358                     (advertising_uses_random_address && advertising_set_random_address_change) ||
6359                     (advertising_enabled == false) ||
6360                     (advertising_uses_whitelist && whitelist_modification_pending) ||
6361                     resolving_list_modification_pending ||
6362                     advertising_set_will_be_removed) {
6363 
6364                     advertising_stop = true;
6365                     advertising_stop_set = advertising_set;
6366                     break;
6367                 }
6368             }
6369 #ifdef ENABLE_LE_PERIODIC_ADVERTISING
6370             if ((advertising_set->state & LE_ADVERTISEMENT_STATE_PERIODIC_ACTIVE) != 0) {
6371                 // stop if:
6372                 // - it's disabled
6373                 // - parameter change required
6374                 bool periodic_enabled = (advertising_set->state & LE_ADVERTISEMENT_STATE_PERIODIC_ENABLED) != 0;
6375                 bool periodic_parameter_change = (advertising_set->tasks & LE_ADVERTISEMENT_TASKS_SET_PERIODIC_PARAMS) != 0;
6376                 if ((periodic_enabled == false) || periodic_parameter_change){
6377                     periodic_advertising_stop = true;
6378                     advertising_stop_set = advertising_set;
6379                 }
6380             }
6381 #endif /* ENABLE_LE_PERIODIC_ADVERTISING */
6382         }
6383     }
6384 #endif
6385 
6386 #endif
6387 
6388 
6389     // Phase 2: stop everything that should be off during modifications
6390 
6391 
6392     // 2.1 Outgoing connection
6393 #ifdef ENABLE_LE_CENTRAL
6394     if (connecting_stop){
6395         hci_send_cmd(&hci_le_create_connection_cancel);
6396         return true;
6397     }
6398 #endif
6399 
6400     // 2.2 Scanning
6401 #ifdef ENABLE_LE_CENTRAL
6402     if (scanning_stop){
6403         hci_stack->le_scanning_active = false;
6404         hci_le_scan_stop();
6405         return true;
6406     }
6407 
6408     // 2.3 Periodic Sync
6409 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6410     if (hci_stack->le_periodic_terminate_sync_handle != HCI_CON_HANDLE_INVALID){
6411         uint16_t sync_handle = hci_stack->le_periodic_terminate_sync_handle;
6412         hci_stack->le_periodic_terminate_sync_handle = HCI_CON_HANDLE_INVALID;
6413         hci_send_cmd(&hci_le_periodic_advertising_terminate_sync, sync_handle);
6414         return true;
6415     }
6416 #ifdef ENABLE_LE_PERIODIC_ADVERTISING
6417     if (periodic_sync_stop){
6418         hci_stack->le_periodic_sync_state = LE_CONNECTING_CANCEL;
6419         hci_send_cmd(&hci_le_periodic_advertising_create_sync_cancel);
6420         return true;
6421     }
6422 #endif /* ENABLE_LE_PERIODIC_ADVERTISING */
6423 #endif /* ENABLE_LE_EXTENDED_ADVERTISING */
6424 #endif /* ENABLE_LE_CENTRAL */
6425 
6426     // 2.4 Advertising: legacy, extended, periodic
6427 #ifdef ENABLE_LE_PERIPHERAL
6428     if (advertising_stop){
6429 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6430         if (hci_le_extended_advertising_supported()) {
6431             uint8_t advertising_stop_handle;
6432             if (advertising_stop_set != NULL){
6433                 advertising_stop_handle = advertising_stop_set->advertising_handle;
6434                 advertising_stop_set->state &= ~LE_ADVERTISEMENT_STATE_ACTIVE;
6435             } else {
6436                 advertising_stop_handle = 0;
6437                 hci_stack->le_advertisements_state &= ~LE_ADVERTISEMENT_STATE_ACTIVE;
6438             }
6439             const uint8_t advertising_handles[] = { advertising_stop_handle };
6440             const uint16_t durations[] = { 0 };
6441             const uint16_t max_events[] = { 0 };
6442             hci_send_cmd(&hci_le_set_extended_advertising_enable, 0, 1, advertising_handles, durations, max_events);
6443         } else
6444 #endif
6445         {
6446             hci_stack->le_advertisements_state &= ~LE_ADVERTISEMENT_STATE_ACTIVE;
6447             hci_send_cmd(&hci_le_set_advertise_enable, 0);
6448         }
6449         return true;
6450     }
6451 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6452 #ifdef ENABLE_LE_PERIODIC_ADVERTISING
6453     if (periodic_advertising_stop){
6454         advertising_stop_set->state &= ~LE_ADVERTISEMENT_STATE_PERIODIC_ACTIVE;
6455         hci_send_cmd(&hci_le_set_periodic_advertising_enable, 0, advertising_stop_set->advertising_handle);
6456         return true;
6457     }
6458 #endif /* ENABLE_LE_PERIODIC_ADVERTISING */
6459 #endif /* ENABLE_LE_EXTENDED_ADVERTISING */
6460 #endif /* ENABLE_LE_PERIPHERAL */
6461 
6462 
6463     // Phase 3: modify
6464 
6465     if (hci_stack->le_advertisements_todo & LE_ADVERTISEMENT_TASKS_PRIVACY_NOTIFY) {
6466         hci_stack->le_advertisements_todo &= ~LE_ADVERTISEMENT_TASKS_PRIVACY_NOTIFY;
6467         // GAP Privacy, notify clients upon upcoming random address change
6468         hci_stack->le_advertisements_state |= LE_ADVERTISEMENT_STATE_PRIVACY_PENDING;
6469         // notify might cause hci_run to get executed, check if we still can send
6470         gap_privacy_clients_notify(hci_stack->le_random_address);
6471         if (!hci_can_send_command_packet_now()) {
6472             return true;
6473         }
6474     }
6475 
6476     // - wait until privacy update completed
6477     if ((hci_stack->le_advertisements_state & LE_ADVERTISEMENT_STATE_PRIVACY_PENDING) != 0){
6478         return false;
6479     }
6480 
6481     if (hci_stack->le_advertisements_todo & LE_ADVERTISEMENT_TASKS_SET_ADDRESS){
6482         hci_stack->le_advertisements_todo &= ~LE_ADVERTISEMENT_TASKS_SET_ADDRESS;
6483         hci_send_cmd(&hci_le_set_random_address, hci_stack->le_random_address);
6484 #ifdef ENABLE_LE_SET_ADV_PARAMS_ON_RANDOM_ADDRESS_CHANGE
6485         // workaround: on some Controllers, address in advertisements is updated only after next dv params set
6486         hci_stack->le_advertisements_todo |= LE_ADVERTISEMENT_TASKS_SET_PARAMS;
6487 #endif
6488         return true;
6489     }
6490 
6491 #ifdef ENABLE_LE_CENTRAL
6492     if (hci_stack->le_scanning_param_update){
6493         hci_stack->le_scanning_param_update = false;
6494 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6495         if (hci_le_extended_advertising_supported()){
6496             // prepare arrays for all phys (LE Coded and LE 1M PHY)
6497             uint8_t  scan_types[2];
6498             uint16_t scan_intervals[2];
6499             uint16_t scan_windows[2];
6500 
6501             uint8_t i;
6502             uint8_t num_phys = hci_le_num_phys(hci_stack->le_scan_phys);
6503             for (i=0;i<num_phys;i++){
6504                 scan_types[i]     = hci_stack->le_scan_type;
6505                 scan_intervals[i] = hci_stack->le_scan_interval;
6506                 scan_windows[i]   = hci_stack->le_scan_window;
6507             }
6508             hci_send_cmd(&hci_le_set_extended_scan_parameters, hci_stack->le_own_addr_type,
6509                          hci_stack->le_scan_filter_policy, hci_stack->le_scan_phys, scan_types, scan_intervals, scan_windows);
6510         } else
6511 #endif
6512         {
6513             hci_send_cmd(&hci_le_set_scan_parameters, hci_stack->le_scan_type, hci_stack->le_scan_interval, hci_stack->le_scan_window,
6514                          hci_stack->le_own_addr_type, hci_stack->le_scan_filter_policy);
6515         }
6516         return true;
6517     }
6518 #endif
6519 
6520 #ifdef ENABLE_LE_PERIPHERAL
6521     if (hci_stack->le_advertisements_todo & LE_ADVERTISEMENT_TASKS_SET_PARAMS){
6522         hci_stack->le_advertisements_todo &= ~LE_ADVERTISEMENT_TASKS_SET_PARAMS;
6523         hci_stack->le_advertisements_own_addr_type = hci_stack->le_own_addr_type;
6524 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6525         if (hci_le_extended_advertising_supported()){
6526             // map advertisment type to advertising event properties
6527             uint16_t adv_event_properties = 0;
6528             const uint16_t mapping[] = { 0b00010011, 0b00010101, 0b00011101, 0b00010010, 0b00010000};
6529             if (hci_stack->le_advertisements_type < (sizeof(mapping)/sizeof(uint16_t))){
6530                 adv_event_properties = mapping[hci_stack->le_advertisements_type];
6531             }
6532             hci_stack->le_advertising_set_in_current_command = 0;
6533             hci_send_cmd(&hci_le_set_extended_advertising_parameters,
6534                          0,
6535                          adv_event_properties,
6536                          hci_stack->le_advertisements_interval_min,
6537                          hci_stack->le_advertisements_interval_max,
6538                          hci_stack->le_advertisements_channel_map,
6539                          hci_stack->le_advertisements_own_addr_type,
6540                          hci_stack->le_advertisements_direct_address_type,
6541                          hci_stack->le_advertisements_direct_address,
6542                          hci_stack->le_advertisements_filter_policy,
6543                          0x7f,  // tx power: no preference
6544                          0x01,  // primary adv phy: LE 1M
6545                          0,     // secondary adv max skip
6546                          0x01,  // secondary adv phy
6547                          0,     // adv sid
6548                          0      // scan request notification
6549                          );
6550         } else
6551 #endif
6552         {
6553             hci_send_cmd(&hci_le_set_advertising_parameters,
6554                          hci_stack->le_advertisements_interval_min,
6555                          hci_stack->le_advertisements_interval_max,
6556                          hci_stack->le_advertisements_type,
6557                          hci_stack->le_advertisements_own_addr_type,
6558                          hci_stack->le_advertisements_direct_address_type,
6559                          hci_stack->le_advertisements_direct_address,
6560                          hci_stack->le_advertisements_channel_map,
6561                          hci_stack->le_advertisements_filter_policy);
6562         }
6563         return true;
6564     }
6565 
6566 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6567     // assumption: only set if extended advertising is supported
6568     if ((hci_stack->le_advertisements_todo & LE_ADVERTISEMENT_TASKS_SET_ADDRESS_SET_0) != 0){
6569         hci_stack->le_advertisements_todo &= ~LE_ADVERTISEMENT_TASKS_SET_ADDRESS_SET_0;
6570         hci_send_cmd(&hci_le_set_advertising_set_random_address, 0, hci_stack->le_random_address);
6571         return true;
6572     }
6573 #endif
6574 
6575     if (hci_stack->le_advertisements_todo & LE_ADVERTISEMENT_TASKS_SET_ADV_DATA){
6576         hci_stack->le_advertisements_todo &= ~LE_ADVERTISEMENT_TASKS_SET_ADV_DATA;
6577         uint8_t adv_data_clean[31];
6578         memset(adv_data_clean, 0, sizeof(adv_data_clean));
6579         (void)memcpy(adv_data_clean, hci_stack->le_advertisements_data,
6580                      hci_stack->le_advertisements_data_len);
6581         btstack_replace_bd_addr_placeholder(adv_data_clean, hci_stack->le_advertisements_data_len, hci_stack->local_bd_addr);
6582 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6583         if (hci_le_extended_advertising_supported()){
6584             hci_stack->le_advertising_set_in_current_command = 0;
6585             hci_send_cmd(&hci_le_set_extended_advertising_data, 0, 0x03, 0x01, hci_stack->le_advertisements_data_len, adv_data_clean);
6586         } else
6587 #endif
6588         {
6589             hci_send_cmd(&hci_le_set_advertising_data, hci_stack->le_advertisements_data_len, adv_data_clean);
6590         }
6591         return true;
6592     }
6593 
6594     if (hci_stack->le_advertisements_todo & LE_ADVERTISEMENT_TASKS_SET_SCAN_DATA){
6595         hci_stack->le_advertisements_todo &= ~LE_ADVERTISEMENT_TASKS_SET_SCAN_DATA;
6596         uint8_t scan_data_clean[31];
6597         memset(scan_data_clean, 0, sizeof(scan_data_clean));
6598         (void)memcpy(scan_data_clean, hci_stack->le_scan_response_data,
6599                      hci_stack->le_scan_response_data_len);
6600         btstack_replace_bd_addr_placeholder(scan_data_clean, hci_stack->le_scan_response_data_len, hci_stack->local_bd_addr);
6601 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6602         if (hci_le_extended_advertising_supported()){
6603             hci_stack->le_advertising_set_in_current_command = 0;
6604             hci_send_cmd(&hci_le_set_extended_scan_response_data, 0, 0x03, 0x01, hci_stack->le_scan_response_data_len, scan_data_clean);
6605         } else
6606 #endif
6607         {
6608             hci_send_cmd(&hci_le_set_scan_response_data, hci_stack->le_scan_response_data_len, scan_data_clean);
6609         }
6610         return true;
6611     }
6612 
6613 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6614     if (hci_le_extended_advertising_supported()) {
6615         btstack_linked_list_iterator_t it;
6616         btstack_linked_list_iterator_init(&it, &hci_stack->le_advertising_sets);
6617         while (btstack_linked_list_iterator_has_next(&it)){
6618             le_advertising_set_t * advertising_set = (le_advertising_set_t*) btstack_linked_list_iterator_next(&it);
6619             if ((advertising_set->tasks & LE_ADVERTISEMENT_TASKS_REMOVE_SET) != 0) {
6620                 advertising_set->tasks &= ~LE_ADVERTISEMENT_TASKS_REMOVE_SET;
6621                 hci_stack->le_advertising_set_in_current_command = advertising_set->advertising_handle;
6622                 hci_send_cmd(&hci_le_remove_advertising_set, advertising_set->advertising_handle);
6623                 return true;
6624             }
6625             if ((advertising_set->tasks & LE_ADVERTISEMENT_TASKS_SET_PARAMS) != 0){
6626                 advertising_set->tasks &= ~LE_ADVERTISEMENT_TASKS_SET_PARAMS;
6627                 hci_stack->le_advertising_set_in_current_command = advertising_set->advertising_handle;
6628                 hci_send_cmd(&hci_le_set_extended_advertising_parameters,
6629                              advertising_set->advertising_handle,
6630                              advertising_set->extended_params.advertising_event_properties,
6631                              advertising_set->extended_params.primary_advertising_interval_min,
6632                              advertising_set->extended_params.primary_advertising_interval_max,
6633                              advertising_set->extended_params.primary_advertising_channel_map,
6634                              advertising_set->extended_params.own_address_type,
6635                              advertising_set->extended_params.peer_address_type,
6636                              advertising_set->extended_params.peer_address,
6637                              advertising_set->extended_params.advertising_filter_policy,
6638                              advertising_set->extended_params.advertising_tx_power,
6639                              advertising_set->extended_params.primary_advertising_phy,
6640                              advertising_set->extended_params.secondary_advertising_max_skip,
6641                              advertising_set->extended_params.secondary_advertising_phy,
6642                              advertising_set->extended_params.advertising_sid,
6643                              advertising_set->extended_params.scan_request_notification_enable
6644                 );
6645                 return true;
6646             }
6647             if ((advertising_set->tasks & LE_ADVERTISEMENT_TASKS_SET_ADDRESS) != 0){
6648                 advertising_set->tasks &= ~LE_ADVERTISEMENT_TASKS_SET_ADDRESS;
6649                 hci_send_cmd(&hci_le_set_advertising_set_random_address, advertising_set->advertising_handle, advertising_set->random_address);
6650                 return true;
6651             }
6652             if ((advertising_set->tasks & LE_ADVERTISEMENT_TASKS_SET_ADV_DATA) != 0) {
6653                 uint16_t pos = advertising_set->adv_data_pos;
6654                 uint8_t  operation = hci_le_extended_advertising_operation_for_chunk(pos, advertising_set->adv_data_len);
6655                 uint16_t data_to_upload = btstack_min(advertising_set->adv_data_len - pos, LE_EXTENDED_ADVERTISING_MAX_CHUNK_LEN);
6656                 if ((operation & 0x02) != 0){
6657                     // last fragment or complete data
6658                     operation |= 2;
6659                     advertising_set->adv_data_pos = 0;
6660                     advertising_set->tasks &= ~LE_ADVERTISEMENT_TASKS_SET_ADV_DATA;
6661                 } else {
6662                     advertising_set->adv_data_pos += data_to_upload;
6663                 }
6664                 hci_stack->le_advertising_set_in_current_command = advertising_set->advertising_handle;
6665                 hci_send_cmd(&hci_le_set_extended_advertising_data, advertising_set->advertising_handle, operation, 0x01, data_to_upload, &advertising_set->adv_data[pos]);
6666                 return true;
6667             }
6668             if ((advertising_set->tasks & LE_ADVERTISEMENT_TASKS_SET_SCAN_DATA) != 0) {
6669                 uint16_t pos = advertising_set->scan_data_pos;
6670                 uint8_t  operation = hci_le_extended_advertising_operation_for_chunk(pos, advertising_set->scan_data_len);
6671                 uint16_t data_to_upload = btstack_min(advertising_set->scan_data_len - pos, LE_EXTENDED_ADVERTISING_MAX_CHUNK_LEN);
6672                 if ((operation & 0x02) != 0){
6673                     advertising_set->scan_data_pos = 0;
6674                     advertising_set->tasks &= ~LE_ADVERTISEMENT_TASKS_SET_SCAN_DATA;
6675                 } else {
6676                     advertising_set->scan_data_pos += data_to_upload;
6677                 }
6678                 hci_stack->le_advertising_set_in_current_command = advertising_set->advertising_handle;
6679                 hci_send_cmd(&hci_le_set_extended_scan_response_data, advertising_set->advertising_handle, operation, 0x01, data_to_upload, &advertising_set->scan_data[pos]);
6680                 return true;
6681             }
6682 #ifdef ENABLE_LE_PERIODIC_ADVERTISING
6683             if ((advertising_set->tasks & LE_ADVERTISEMENT_TASKS_SET_PERIODIC_PARAMS) != 0){
6684                 advertising_set->tasks &= ~LE_ADVERTISEMENT_TASKS_SET_PERIODIC_PARAMS;
6685                 hci_stack->le_advertising_set_in_current_command = advertising_set->advertising_handle;
6686                 hci_send_cmd(&hci_le_set_periodic_advertising_parameters,
6687                              advertising_set->advertising_handle,
6688                              advertising_set->periodic_params.periodic_advertising_interval_min,
6689                              advertising_set->periodic_params.periodic_advertising_interval_max,
6690                              advertising_set->periodic_params.periodic_advertising_properties);
6691                 return true;
6692             }
6693             if ((advertising_set->tasks & LE_ADVERTISEMENT_TASKS_SET_PERIODIC_DATA) != 0) {
6694                 uint16_t pos = advertising_set->periodic_data_pos;
6695                 uint8_t  operation = hci_le_extended_advertising_operation_for_chunk(pos, advertising_set->periodic_data_len);
6696                 uint16_t data_to_upload = btstack_min(advertising_set->periodic_data_len - pos, LE_EXTENDED_ADVERTISING_MAX_CHUNK_LEN);
6697                 if ((operation & 0x02) != 0){
6698                     // last fragment or complete data
6699                     operation |= 2;
6700                     advertising_set->periodic_data_pos = 0;
6701                     advertising_set->tasks &= ~LE_ADVERTISEMENT_TASKS_SET_PERIODIC_DATA;
6702                 } else {
6703                     advertising_set->periodic_data_pos += data_to_upload;
6704                 }
6705                 hci_stack->le_advertising_set_in_current_command = advertising_set->advertising_handle;
6706                 hci_send_cmd(&hci_le_set_periodic_advertising_data, advertising_set->advertising_handle, operation, data_to_upload, &advertising_set->periodic_data[pos]);
6707                 return true;
6708             }
6709 #endif /* ENABLE_LE_PERIODIC_ADVERTISING */
6710         }
6711     }
6712 #endif
6713 
6714 #endif
6715 
6716 #ifdef ENABLE_LE_CENTRAL
6717     // if connect with whitelist was active and is not cancelled yet, wait until next time
6718     if (hci_stack->le_connecting_state == LE_CONNECTING_CANCEL) return false;
6719 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6720     // if periodic sync with advertiser list was active and is not cancelled yet, wait until next time
6721     if (hci_stack->le_periodic_sync_state == LE_CONNECTING_CANCEL) return false;
6722 #endif
6723 #endif
6724 
6725     // LE Whitelist Management
6726     if (whitelist_modification_pending){
6727         bool done = hci_whitelist_modification_process();
6728         if (done) return true;
6729     }
6730 
6731 #ifdef ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION
6732     // LE Resolving List Management
6733     if (resolving_list_modification_pending) {
6734 		uint16_t i;
6735         uint8_t null_16[16];
6736         uint8_t local_irk_flipped[16];
6737         const uint8_t *local_irk;
6738 		switch (hci_stack->le_resolving_list_state) {
6739 			case LE_RESOLVING_LIST_SEND_ENABLE_ADDRESS_RESOLUTION:
6740 				hci_stack->le_resolving_list_state = LE_RESOLVING_LIST_READ_SIZE;
6741 				hci_send_cmd(&hci_le_set_address_resolution_enabled, 1);
6742 				return true;
6743 			case LE_RESOLVING_LIST_READ_SIZE:
6744 				hci_stack->le_resolving_list_state = LE_RESOLVING_LIST_SEND_CLEAR;
6745 				hci_send_cmd(&hci_le_read_resolving_list_size);
6746 				return true;
6747 			case LE_RESOLVING_LIST_SEND_CLEAR:
6748 				hci_stack->le_resolving_list_state = LE_RESOLVING_LIST_SET_IRK;
6749 				(void) memset(hci_stack->le_resolving_list_add_entries, 0xff,
6750 							  sizeof(hci_stack->le_resolving_list_add_entries));
6751                 (void) memset(hci_stack->le_resolving_list_set_privacy_mode, 0xff,
6752                               sizeof(hci_stack->le_resolving_list_set_privacy_mode));
6753 				(void) memset(hci_stack->le_resolving_list_remove_entries, 0,
6754 							  sizeof(hci_stack->le_resolving_list_remove_entries));
6755 				hci_send_cmd(&hci_le_clear_resolving_list);
6756 				return true;
6757             case LE_RESOLVING_LIST_SET_IRK:
6758                 // set IRK used by RPA for undirected advertising
6759                 hci_stack->le_resolving_list_state = LE_RESOLVING_LIST_UPDATES_ENTRIES;
6760                 local_irk = gap_get_persistent_irk();
6761                 reverse_128(local_irk, local_irk_flipped);
6762                 memset(null_16, 0, sizeof(null_16));
6763                 hci_send_cmd(&hci_le_add_device_to_resolving_list, BD_ADDR_TYPE_LE_PUBLIC, null_16,
6764                              null_16, local_irk_flipped);
6765                 return true;
6766 			case LE_RESOLVING_LIST_UPDATES_ENTRIES:
6767                 // first remove old entries
6768 				for (i = 0; i < MAX_NUM_RESOLVING_LIST_ENTRIES && i < le_device_db_max_count(); i++) {
6769 					uint8_t offset = i >> 3;
6770 					uint8_t mask = 1 << (i & 7);
6771 					if ((hci_stack->le_resolving_list_remove_entries[offset] & mask) == 0) continue;
6772 					hci_stack->le_resolving_list_remove_entries[offset] &= ~mask;
6773 					bd_addr_t peer_identity_addreses;
6774 					int peer_identity_addr_type = (int) BD_ADDR_TYPE_UNKNOWN;
6775 					sm_key_t peer_irk;
6776 					le_device_db_info(i, &peer_identity_addr_type, peer_identity_addreses, peer_irk);
6777 					if (peer_identity_addr_type == BD_ADDR_TYPE_UNKNOWN) continue;
6778 
6779 #ifdef ENABLE_LE_WHITELIST_TOUCH_AFTER_RESOLVING_LIST_UPDATE
6780 					// trigger whitelist entry 'update' (work around for controller bug)
6781 					btstack_linked_list_iterator_init(&lit, &hci_stack->le_whitelist);
6782 					while (btstack_linked_list_iterator_has_next(&lit)) {
6783 						whitelist_entry_t *entry = (whitelist_entry_t *) btstack_linked_list_iterator_next(&lit);
6784 						if (entry->address_type != peer_identity_addr_type) continue;
6785 						if (memcmp(entry->address, peer_identity_addreses, 6) != 0) continue;
6786 						log_info("trigger whitelist update %s", bd_addr_to_str(peer_identity_addreses));
6787 						entry->state |= LE_WHITELIST_REMOVE_FROM_CONTROLLER | LE_WHITELIST_ADD_TO_CONTROLLER;
6788 					}
6789 #endif
6790 
6791 					hci_send_cmd(&hci_le_remove_device_from_resolving_list, peer_identity_addr_type,
6792 								 peer_identity_addreses);
6793 					return true;
6794 				}
6795 
6796                 // then add new entries
6797 				for (i = 0; i < MAX_NUM_RESOLVING_LIST_ENTRIES && i < le_device_db_max_count(); i++) {
6798 					uint8_t offset = i >> 3;
6799 					uint8_t mask = 1 << (i & 7);
6800 					if ((hci_stack->le_resolving_list_add_entries[offset] & mask) == 0) continue;
6801 					hci_stack->le_resolving_list_add_entries[offset] &= ~mask;
6802 					bd_addr_t peer_identity_addreses;
6803 					int peer_identity_addr_type = (int) BD_ADDR_TYPE_UNKNOWN;
6804 					sm_key_t peer_irk;
6805 					le_device_db_info(i, &peer_identity_addr_type, peer_identity_addreses, peer_irk);
6806 					if (peer_identity_addr_type == BD_ADDR_TYPE_UNKNOWN) continue;
6807                     if (btstack_is_null(peer_irk, 16)) continue;
6808 					local_irk = gap_get_persistent_irk();
6809 					// command uses format specifier 'P' that stores 16-byte value without flip
6810 					uint8_t peer_irk_flipped[16];
6811 					reverse_128(local_irk, local_irk_flipped);
6812 					reverse_128(peer_irk, peer_irk_flipped);
6813 					hci_send_cmd(&hci_le_add_device_to_resolving_list, peer_identity_addr_type, peer_identity_addreses,
6814 								 peer_irk_flipped, local_irk_flipped);
6815 					return true;
6816 				}
6817 
6818                 // finally, set privacy mode
6819                 for (i = 0; i < MAX_NUM_RESOLVING_LIST_ENTRIES && i < le_device_db_max_count(); i++) {
6820                     uint8_t offset = i >> 3;
6821                     uint8_t mask = 1 << (i & 7);
6822                     if ((hci_stack->le_resolving_list_set_privacy_mode[offset] & mask) == 0) continue;
6823                     hci_stack->le_resolving_list_set_privacy_mode[offset] &= ~mask;
6824                     if (hci_stack->le_privacy_mode == LE_PRIVACY_MODE_NETWORK) {
6825                         // Network Privacy Mode is default
6826                         continue;
6827                     }
6828                     bd_addr_t peer_identity_address;
6829                     int peer_identity_addr_type = (int) BD_ADDR_TYPE_UNKNOWN;
6830                     sm_key_t peer_irk;
6831                     le_device_db_info(i, &peer_identity_addr_type, peer_identity_address, peer_irk);
6832                     if (peer_identity_addr_type == BD_ADDR_TYPE_UNKNOWN) continue;
6833                     if (btstack_is_null(peer_irk, 16)) continue;
6834                     // command uses format specifier 'P' that stores 16-byte value without flip
6835                     uint8_t peer_irk_flipped[16];
6836                     reverse_128(peer_irk, peer_irk_flipped);
6837                     hci_send_cmd(&hci_le_set_privacy_mode, peer_identity_addr_type, peer_identity_address, hci_stack->le_privacy_mode);
6838                     return true;
6839                 }
6840 				break;
6841 
6842 			default:
6843 				break;
6844 		}
6845         hci_stack->le_resolving_list_state = LE_RESOLVING_LIST_DONE;
6846 	}
6847 #endif
6848 
6849 #ifdef ENABLE_LE_CENTRAL
6850 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6851     // LE Whitelist Management
6852     if (periodic_list_modification_pending){
6853         // add/remove entries
6854         btstack_linked_list_iterator_init(&lit, &hci_stack->le_periodic_advertiser_list);
6855         while (btstack_linked_list_iterator_has_next(&lit)){
6856             periodic_advertiser_list_entry_t * entry = (periodic_advertiser_list_entry_t*) btstack_linked_list_iterator_next(&lit);
6857             if (entry->state & LE_PERIODIC_ADVERTISER_LIST_ENTRY_REMOVE_FROM_CONTROLLER){
6858                 entry->state &= ~LE_PERIODIC_ADVERTISER_LIST_ENTRY_REMOVE_FROM_CONTROLLER;
6859                 hci_send_cmd(&hci_le_remove_device_from_periodic_advertiser_list, entry->address_type, entry->address, entry->sid);
6860                 return true;
6861             }
6862             if (entry->state & LE_PERIODIC_ADVERTISER_LIST_ENTRY_ADD_TO_CONTROLLER){
6863                 entry->state &= ~LE_PERIODIC_ADVERTISER_LIST_ENTRY_ADD_TO_CONTROLLER;
6864                 entry->state |= LE_PERIODIC_ADVERTISER_LIST_ENTRY_ON_CONTROLLER;
6865                 hci_send_cmd(&hci_le_add_device_to_periodic_advertiser_list, entry->address_type, entry->address, entry->sid);
6866                 return true;
6867             }
6868             if ((entry->state & LE_PERIODIC_ADVERTISER_LIST_ENTRY_ON_CONTROLLER) == 0){
6869                 btstack_linked_list_remove(&hci_stack->le_periodic_advertiser_list, (btstack_linked_item_t *) entry);
6870                 btstack_memory_periodic_advertiser_list_entry_free(entry);
6871             }
6872         }
6873     }
6874 #endif
6875 #endif
6876 
6877 #ifdef ENABLE_LE_CENTRAL
6878 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6879 #ifdef ENABLE_LE_PERIODIC_ADVERTISING
6880     if (hci_stack->le_past_set_default_params){
6881         hci_stack->le_past_set_default_params = false;
6882         hci_send_cmd(&hci_le_set_default_periodic_advertising_sync_transfer_parameters,
6883                      hci_stack->le_past_mode,
6884                      hci_stack->le_past_skip,
6885                      hci_stack->le_past_sync_timeout,
6886                      hci_stack->le_past_cte_type);
6887         return true;
6888     }
6889 #endif
6890 #endif
6891 #endif
6892 
6893     // postpone all actions until stack is fully working
6894     if (hci_stack->state != HCI_STATE_WORKING) return false;
6895 
6896     // advertisements, active scanning, and creating connections requires random address to be set if using private address
6897     if ( (hci_stack->le_own_addr_type != BD_ADDR_TYPE_LE_PUBLIC) && (hci_stack->le_random_address_set == 0u) ) return false;
6898 
6899     // Phase 4: restore state
6900 
6901 #ifdef ENABLE_LE_CENTRAL
6902     // re-start scanning
6903     if ((hci_stack->le_scanning_enabled && !hci_stack->le_scanning_active)){
6904         hci_stack->le_scanning_active = true;
6905 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6906         if (hci_le_extended_advertising_supported()){
6907             hci_send_cmd(&hci_le_set_extended_scan_enable, 1, hci_stack->le_scan_filter_duplicates, 0, 0);
6908         } else
6909 #endif
6910         {
6911             hci_send_cmd(&hci_le_set_scan_enable, 1, hci_stack->le_scan_filter_duplicates);
6912         }
6913         return true;
6914     }
6915 #endif
6916 
6917 #ifdef ENABLE_LE_CENTRAL
6918     // re-start connecting
6919     if ( (hci_stack->le_connecting_state == LE_CONNECTING_IDLE) && (hci_stack->le_connecting_request == LE_CONNECTING_WHITELIST)){
6920         bd_addr_t null_addr;
6921         memset(null_addr, 0, 6);
6922         hci_stack->le_connection_own_addr_type =  hci_stack->le_own_addr_type;
6923         hci_get_own_address_for_addr_type(hci_stack->le_connection_own_addr_type, hci_stack->le_connection_own_address);
6924         hci_send_le_create_connection(1, 0, null_addr);
6925         return true;
6926     }
6927 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6928     if (hci_stack->le_periodic_sync_state == LE_CONNECTING_IDLE){
6929         switch(hci_stack->le_periodic_sync_request){
6930             case LE_CONNECTING_DIRECT:
6931             case LE_CONNECTING_WHITELIST:
6932                 hci_stack->le_periodic_sync_state = ((hci_stack->le_periodic_sync_options & 1) != 0) ? LE_CONNECTING_WHITELIST : LE_CONNECTING_DIRECT;
6933                 hci_send_cmd(&hci_le_periodic_advertising_create_sync,
6934                              hci_stack->le_periodic_sync_options,
6935                              hci_stack->le_periodic_sync_advertising_sid,
6936                              hci_stack->le_periodic_sync_advertiser_address_type,
6937                              hci_stack->le_periodic_sync_advertiser_address,
6938                              hci_stack->le_periodic_sync_skip,
6939                              hci_stack->le_periodic_sync_timeout,
6940                              hci_stack->le_periodic_sync_cte_type);
6941                 return true;
6942             default:
6943                 break;
6944         }
6945     }
6946 #endif
6947 #endif
6948 
6949 #ifdef ENABLE_LE_PERIPHERAL
6950     // re-start advertising
6951     if (hci_stack->le_advertisements_enabled_for_current_roles && ((hci_stack->le_advertisements_state & LE_ADVERTISEMENT_STATE_ACTIVE) == 0)){
6952         // check if advertisements should be enabled given
6953         hci_stack->le_advertisements_state |= LE_ADVERTISEMENT_STATE_ACTIVE;
6954         hci_get_own_address_for_addr_type(hci_stack->le_advertisements_own_addr_type, hci_stack->le_advertisements_own_address);
6955 
6956 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6957         if (hci_le_extended_advertising_supported()){
6958             const uint8_t advertising_handles[] = { 0 };
6959             const uint16_t durations[] = { 0 };
6960             const uint16_t max_events[] = { 0 };
6961             hci_send_cmd(&hci_le_set_extended_advertising_enable, 1, 1, advertising_handles, durations, max_events);
6962         } else
6963 #endif
6964         {
6965             hci_send_cmd(&hci_le_set_advertise_enable, 1);
6966         }
6967         return true;
6968     }
6969 
6970 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
6971     if (hci_le_extended_advertising_supported()) {
6972         btstack_linked_list_iterator_t it;
6973         btstack_linked_list_iterator_init(&it, &hci_stack->le_advertising_sets);
6974         while (btstack_linked_list_iterator_has_next(&it)) {
6975             le_advertising_set_t *advertising_set = (le_advertising_set_t *) btstack_linked_list_iterator_next(&it);
6976             if (((advertising_set->state & LE_ADVERTISEMENT_STATE_ENABLED) != 0) && ((advertising_set->state & LE_ADVERTISEMENT_STATE_ACTIVE) == 0)){
6977                 advertising_set->state |= LE_ADVERTISEMENT_STATE_ACTIVE;
6978                 const uint8_t advertising_handles[] = { advertising_set->advertising_handle };
6979                 const uint16_t durations[] = { advertising_set->enable_timeout };
6980                 const uint16_t max_events[] = { advertising_set->enable_max_scan_events };
6981                 hci_send_cmd(&hci_le_set_extended_advertising_enable, 1, 1, advertising_handles, durations, max_events);
6982                 return true;
6983             }
6984 #ifdef ENABLE_LE_PERIODIC_ADVERTISING
6985             if (((advertising_set->state & LE_ADVERTISEMENT_STATE_PERIODIC_ENABLED) != 0) && ((advertising_set->state & LE_ADVERTISEMENT_STATE_PERIODIC_ACTIVE) == 0)){
6986                 advertising_set->state |= LE_ADVERTISEMENT_STATE_PERIODIC_ACTIVE;
6987                 uint8_t enable = 1;
6988                 if (advertising_set->periodic_include_adi){
6989                     enable |= 2;
6990                 }
6991                 hci_send_cmd(&hci_le_set_periodic_advertising_enable, enable, advertising_set->advertising_handle);
6992                 return true;
6993             }
6994 #endif /* ENABLE_LE_PERIODIC_ADVERTISING */
6995         }
6996     }
6997 #endif
6998 #endif
6999 
7000     return false;
7001 }
7002 
7003 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
7004 static bool hci_run_iso_tasks(void){
7005     btstack_linked_list_iterator_t it;
7006 
7007     if (hci_stack->iso_active_operation_type != HCI_ISO_TYPE_INVALID) {
7008         return false;
7009     }
7010 
7011     // BIG
7012     btstack_linked_list_iterator_init(&it, &hci_stack->le_audio_bigs);
7013     while (btstack_linked_list_iterator_has_next(&it)){
7014         le_audio_big_t * big = (le_audio_big_t *) btstack_linked_list_iterator_next(&it);
7015         switch (big->state){
7016             case LE_AUDIO_BIG_STATE_CREATE:
7017                 hci_stack->iso_active_operation_group_id = big->params->big_handle;
7018                 hci_stack->iso_active_operation_type = HCI_ISO_TYPE_BIS;
7019                 big->state = LE_AUDIO_BIG_STATE_W4_ESTABLISHED;
7020                 hci_send_cmd(&hci_le_create_big,
7021                              big->params->big_handle,
7022                              big->params->advertising_handle,
7023                              big->params->num_bis,
7024                              big->params->sdu_interval_us,
7025                              big->params->max_sdu,
7026                              big->params->max_transport_latency_ms,
7027                              big->params->rtn,
7028                              big->params->phy,
7029                              big->params->packing,
7030                              big->params->framing,
7031                              big->params->encryption,
7032                              big->params->broadcast_code);
7033                 return true;
7034             case LE_AUDIO_BIG_STATE_SETUP_ISO_PATH:
7035                 big->state = LE_AUDIO_BIG_STATE_W4_SETUP_ISO_PATH;
7036                 hci_send_cmd(&hci_le_setup_iso_data_path, big->bis_con_handles[big->state_vars.next_bis], 0, 0, HCI_AUDIO_CODING_FORMAT_TRANSPARENT, 0, 0,  0, 0, NULL);
7037                 return true;
7038             case LE_AUDIO_BIG_STATE_SETUP_ISO_PATHS_FAILED:
7039                 big->state = LE_AUDIO_BIG_STATE_W4_TERMINATED_AFTER_SETUP_FAILED;
7040                 hci_send_cmd(&hci_le_terminate_big, big->big_handle, big->state_vars.status);
7041                 return true;
7042             case LE_AUDIO_BIG_STATE_TERMINATE:
7043                 big->state = LE_AUDIO_BIG_STATE_W4_TERMINATED;
7044                 hci_send_cmd(&hci_le_terminate_big, big->big_handle, ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION);
7045                 return true;
7046             default:
7047                 break;
7048         }
7049     }
7050 
7051     // BIG Sync
7052     btstack_linked_list_iterator_init(&it, &hci_stack->le_audio_big_syncs);
7053     while (btstack_linked_list_iterator_has_next(&it)){
7054         le_audio_big_sync_t * big_sync = (le_audio_big_sync_t *) btstack_linked_list_iterator_next(&it);
7055         switch (big_sync->state){
7056             case LE_AUDIO_BIG_STATE_CREATE:
7057                 hci_stack->iso_active_operation_group_id = big_sync->params->big_handle;
7058                 hci_stack->iso_active_operation_type = HCI_ISO_TYPE_BIS;
7059                 big_sync->state = LE_AUDIO_BIG_STATE_W4_ESTABLISHED;
7060                 hci_send_cmd(&hci_le_big_create_sync,
7061                              big_sync->params->big_handle,
7062                              big_sync->params->sync_handle,
7063                              big_sync->params->encryption,
7064                              big_sync->params->broadcast_code,
7065                              big_sync->params->mse,
7066                              big_sync->params->big_sync_timeout_10ms,
7067                              big_sync->params->num_bis,
7068                              big_sync->params->bis_indices);
7069                 return true;
7070             case LE_AUDIO_BIG_STATE_SETUP_ISO_PATH:
7071                 big_sync->state = LE_AUDIO_BIG_STATE_W4_SETUP_ISO_PATH;
7072                 hci_send_cmd(&hci_le_setup_iso_data_path, big_sync->bis_con_handles[big_sync->state_vars.next_bis], 1, 0, HCI_AUDIO_CODING_FORMAT_TRANSPARENT, 0, 0, 0, 0, NULL);
7073                 return true;
7074             case LE_AUDIO_BIG_STATE_SETUP_ISO_PATHS_FAILED:
7075                 big_sync->state = LE_AUDIO_BIG_STATE_W4_TERMINATED_AFTER_SETUP_FAILED;
7076                 hci_send_cmd(&hci_le_big_terminate_sync, big_sync->big_handle);
7077                 return true;
7078             case LE_AUDIO_BIG_STATE_TERMINATE:
7079                 big_sync->state = LE_AUDIO_BIG_STATE_W4_TERMINATED;
7080                 hci_send_cmd(&hci_le_big_terminate_sync, big_sync->big_handle);
7081                 return true;
7082             default:
7083                 break;
7084         }
7085     }
7086 
7087     // CIG
7088     bool cig_active;
7089     btstack_linked_list_iterator_init(&it, &hci_stack->le_audio_cigs);
7090     while (btstack_linked_list_iterator_has_next(&it)) {
7091         le_audio_cig_t *cig = (le_audio_cig_t *) btstack_linked_list_iterator_next(&it);
7092         uint8_t i;
7093         // Set CIG Parameters
7094         uint8_t cis_id[MAX_NR_CIS];
7095         uint16_t max_sdu_c_to_p[MAX_NR_CIS];
7096         uint16_t max_sdu_p_to_c[MAX_NR_CIS];
7097         uint8_t phy_c_to_p[MAX_NR_CIS];
7098         uint8_t phy_p_to_c[MAX_NR_CIS];
7099         uint8_t rtn_c_to_p[MAX_NR_CIS];
7100         uint8_t rtn_p_to_c[MAX_NR_CIS];
7101         switch (cig->state) {
7102             case LE_AUDIO_CIG_STATE_CREATE:
7103                 hci_stack->iso_active_operation_group_id = cig->params->cig_id;
7104                 hci_stack->iso_active_operation_type = HCI_ISO_TYPE_CIS;
7105                 cig->state = LE_AUDIO_CIG_STATE_W4_ESTABLISHED;
7106                 le_audio_cig_params_t * params = cig->params;
7107                 for (i = 0; i < params->num_cis; i++) {
7108                     le_audio_cis_params_t * cis_params = &cig->params->cis_params[i];
7109                     cis_id[i]         = cis_params->cis_id;
7110                     max_sdu_c_to_p[i] = cis_params->max_sdu_c_to_p;
7111                     max_sdu_p_to_c[i] = cis_params->max_sdu_p_to_c;
7112                     phy_c_to_p[i]     = cis_params->phy_c_to_p;
7113                     phy_p_to_c[i]     = cis_params->phy_p_to_c;
7114                     rtn_c_to_p[i]     = cis_params->rtn_c_to_p;
7115                     rtn_p_to_c[i]     = cis_params->rtn_p_to_c;
7116                 }
7117                 hci_send_cmd(&hci_le_set_cig_parameters,
7118                              cig->cig_id,
7119                              params->sdu_interval_c_to_p,
7120                              params->sdu_interval_p_to_c,
7121                              params->worst_case_sca,
7122                              params->packing,
7123                              params->framing,
7124                              params->max_transport_latency_c_to_p,
7125                              params->max_transport_latency_p_to_c,
7126                              params->num_cis,
7127                              cis_id,
7128                              max_sdu_c_to_p,
7129                              max_sdu_p_to_c,
7130                              phy_c_to_p,
7131                              phy_p_to_c,
7132                              rtn_c_to_p,
7133                              rtn_p_to_c
7134                 );
7135                 return true;
7136             case LE_AUDIO_CIG_STATE_CREATE_CIS:
7137                 hci_stack->iso_active_operation_group_id = cig->params->cig_id;
7138                 hci_stack->iso_active_operation_type = HCI_ISO_TYPE_CIS;
7139                 cig->state = LE_AUDIO_CIG_STATE_W4_CREATE_CIS;
7140                 for (i=0;i<cig->num_cis;i++){
7141                     cig->cis_setup_active[i] = true;
7142                 }
7143                 hci_send_cmd(&hci_le_create_cis, cig->num_cis, cig->cis_con_handles, cig->acl_con_handles);
7144                 return true;
7145             case LE_AUDIO_CIG_STATE_SETUP_ISO_PATH:
7146                 while (cig->state_vars.next_cis < (cig->num_cis * 2)){
7147                     // find next path to setup
7148                     uint8_t cis_index = cig->state_vars.next_cis >> 1;
7149                     if (cig->cis_established[cis_index] == false) {
7150                         continue;
7151                     }
7152                     uint8_t cis_direction = cig->state_vars.next_cis & 1;
7153                     bool setup = true;
7154                     if (cis_direction == 0){
7155                         // 0 - input - host to controller
7156                         // we are central => central to peripheral
7157                         setup &= cig->params->cis_params[cis_index].max_sdu_c_to_p > 0;
7158                     } else {
7159                         // 1 - output - controller to host
7160                         // we are central => peripheral to central
7161                         setup &= cig->params->cis_params[cis_index].max_sdu_p_to_c > 0;
7162                     }
7163                     if (setup){
7164                         hci_stack->iso_active_operation_group_id = cig->params->cig_id;
7165                         hci_stack->iso_active_operation_type = HCI_ISO_TYPE_CIS;
7166                         cig->state = LE_AUDIO_CIG_STATE_W4_SETUP_ISO_PATH;
7167                         hci_send_cmd(&hci_le_setup_iso_data_path, cig->cis_con_handles[cis_index], cis_direction, 0, HCI_AUDIO_CODING_FORMAT_TRANSPARENT, 0, 0, 0, 0, NULL);
7168                         return true;
7169                     }
7170                     cig->state_vars.next_cis++;
7171                 }
7172                 // emit done
7173                 cig->state = LE_AUDIO_CIG_STATE_ACTIVE;
7174                 break;
7175             case LE_AUDIO_CIG_STATE_REMOVE:
7176                 // check if CIG Active
7177                 cig_active = false;
7178                 for (i = 0; i < cig->num_cis; i++) {
7179                     if (cig->cis_con_handles[i] != HCI_CON_HANDLE_INVALID){
7180                         hci_iso_stream_t * stream = hci_iso_stream_for_con_handle(cig->cis_con_handles[i]);
7181                         if (stream != NULL){
7182                             cig_active = true;
7183                             break;
7184                         }
7185                     }
7186                 }
7187                 if (cig_active == false){
7188                     btstack_linked_list_iterator_remove(&it);
7189                     hci_send_cmd(&hci_le_remove_cig, cig->cig_id);
7190                     return true;
7191                 }
7192             default:
7193                 break;
7194         }
7195     }
7196 
7197     // CIS Accept/Reject/Setup ISO Path/Close
7198     btstack_linked_list_iterator_init(&it, &hci_stack->iso_streams);
7199     while (btstack_linked_list_iterator_has_next(&it)) {
7200         hci_iso_stream_t *iso_stream = (hci_iso_stream_t *) btstack_linked_list_iterator_next(&it);
7201         hci_con_handle_t con_handle;
7202         switch (iso_stream->state){
7203             case HCI_ISO_STREAM_W2_ACCEPT:
7204                 iso_stream->state = HCI_ISO_STREAM_STATE_W4_ESTABLISHED;
7205                 hci_stack->iso_active_operation_type = HCI_ISO_TYPE_CIS;
7206                 hci_stack->iso_active_operation_group_id = HCI_ISO_GROUP_ID_SINGLE_CIS;
7207                 hci_send_cmd(&hci_le_accept_cis_request, iso_stream->cis_handle);
7208                 return true;
7209             case HCI_ISO_STREAM_W2_REJECT:
7210                 con_handle = iso_stream->cis_handle;
7211                 hci_stack->iso_active_operation_type = HCI_ISO_TYPE_CIS;
7212                 hci_stack->iso_active_operation_group_id = HCI_ISO_GROUP_ID_SINGLE_CIS;
7213                 hci_iso_stream_finalize(iso_stream);
7214                 hci_send_cmd(&hci_le_reject_cis_request, con_handle, ERROR_CODE_REMOTE_DEVICE_TERMINATED_CONNECTION_DUE_TO_LOW_RESOURCES);
7215                 return true;
7216             case HCI_ISO_STREAM_STATE_W2_SETUP_ISO_INPUT:
7217                 hci_stack->iso_active_operation_group_id = HCI_ISO_GROUP_ID_SINGLE_CIS;
7218                 hci_stack->iso_active_operation_type = HCI_ISO_TYPE_CIS;
7219                 iso_stream->state = HCI_ISO_STREAM_STATE_W4_ISO_SETUP_INPUT;
7220                 hci_send_cmd(&hci_le_setup_iso_data_path, iso_stream->cis_handle, 0, 0, HCI_AUDIO_CODING_FORMAT_TRANSPARENT, 0, 0, 0, 0, NULL);
7221                 return true;
7222             case HCI_ISO_STREAM_STATE_W2_SETUP_ISO_OUTPUT:
7223                 hci_stack->iso_active_operation_group_id = HCI_ISO_GROUP_ID_SINGLE_CIS;
7224                 hci_stack->iso_active_operation_type = HCI_ISO_TYPE_CIS;
7225                 iso_stream->state = HCI_ISO_STREAM_STATE_W4_ISO_SETUP_OUTPUT;
7226                 hci_send_cmd(&hci_le_setup_iso_data_path, iso_stream->cis_handle, 1, 0, HCI_AUDIO_CODING_FORMAT_TRANSPARENT, 0, 0, 0, 0, NULL);
7227                 return true;
7228             case HCI_ISO_STREAM_STATE_W2_CLOSE:
7229                 iso_stream->state = HCI_ISO_STREAM_STATE_W4_DISCONNECTED;
7230                 hci_send_cmd(&hci_disconnect, iso_stream->cis_handle, ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION);
7231                 return true;
7232             default:
7233                 break;
7234         }
7235     }
7236 
7237     return false;
7238 }
7239 #endif /* ENABLE_LE_ISOCHRONOUS_STREAMS */
7240 #endif
7241 
7242 static bool hci_run_general_pending_commands(void){
7243     btstack_linked_item_t * it;
7244     for (it = (btstack_linked_item_t *) hci_stack->connections; it != NULL; it = it->next){
7245         hci_connection_t * connection = (hci_connection_t *) it;
7246 
7247         switch(connection->state){
7248             case SEND_CREATE_CONNECTION:
7249                 switch(connection->address_type){
7250 #ifdef ENABLE_CLASSIC
7251                     case BD_ADDR_TYPE_ACL:
7252                         log_info("sending hci_create_connection");
7253                         hci_send_cmd(&hci_create_connection, connection->address, hci_usable_acl_packet_types(), 0, 0, 0, hci_stack->allow_role_switch);
7254                         break;
7255 #endif
7256                     default:
7257 #ifdef ENABLE_BLE
7258 #ifdef ENABLE_LE_CENTRAL
7259                         log_info("sending hci_le_create_connection");
7260                         hci_stack->le_connection_own_addr_type =  hci_stack->le_own_addr_type;
7261                         hci_get_own_address_for_addr_type(hci_stack->le_connection_own_addr_type, hci_stack->le_connection_own_address);
7262                         hci_send_le_create_connection(0, connection->address_type, connection->address);
7263                         connection->state = SENT_CREATE_CONNECTION;
7264 #endif
7265 #endif
7266                         break;
7267                 }
7268                 return true;
7269 
7270 #ifdef ENABLE_CLASSIC
7271             case RECEIVED_CONNECTION_REQUEST:
7272                 if (connection->address_type == BD_ADDR_TYPE_ACL){
7273                     log_info("sending hci_accept_connection_request");
7274                     connection->state = ACCEPTED_CONNECTION_REQUEST;
7275                     hci_send_cmd(&hci_accept_connection_request, connection->address, hci_stack->master_slave_policy);
7276                     return true;
7277                 }
7278                 break;
7279 #endif
7280             case SEND_DISCONNECT:
7281                 connection->state = SENT_DISCONNECT;
7282                 hci_send_cmd(&hci_disconnect, connection->con_handle, ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION);
7283                 return true;
7284 
7285             default:
7286                 break;
7287         }
7288 
7289         // no further commands if connection is about to get shut down
7290         if (connection->state == SENT_DISCONNECT) continue;
7291 
7292 #ifdef ENABLE_CLASSIC
7293 
7294         // Handling link key request requires remote supported features
7295         if (((connection->authentication_flags & AUTH_FLAG_HANDLE_LINK_KEY_REQUEST) != 0)){
7296             log_info("responding to link key request, have link key db: %u", hci_stack->link_key_db != NULL);
7297             connectionClearAuthenticationFlags(connection, AUTH_FLAG_HANDLE_LINK_KEY_REQUEST);
7298 
7299             bool have_link_key = connection->link_key_type != INVALID_LINK_KEY;
7300             bool security_level_sufficient = have_link_key && (gap_security_level_for_link_key_type(connection->link_key_type) >= connection->requested_security_level);
7301             if (have_link_key && security_level_sufficient){
7302                 hci_send_cmd(&hci_link_key_request_reply, connection->address, &connection->link_key);
7303             } else {
7304                 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address);
7305             }
7306             return true;
7307         }
7308 
7309         if (connection->authentication_flags & AUTH_FLAG_DENY_PIN_CODE_REQUEST){
7310             log_info("denying to pin request");
7311             connectionClearAuthenticationFlags(connection, AUTH_FLAG_DENY_PIN_CODE_REQUEST);
7312             hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address);
7313             return true;
7314         }
7315 
7316         // security assessment requires remote features
7317         if ((connection->authentication_flags & AUTH_FLAG_RECV_IO_CAPABILITIES_REQUEST) != 0){
7318             connectionClearAuthenticationFlags(connection, AUTH_FLAG_RECV_IO_CAPABILITIES_REQUEST);
7319             hci_ssp_assess_security_on_io_cap_request(connection);
7320             // no return here as hci_ssp_assess_security_on_io_cap_request only sets AUTH_FLAG_SEND_IO_CAPABILITIES_REPLY or AUTH_FLAG_SEND_IO_CAPABILITIES_NEGATIVE_REPLY
7321         }
7322 
7323         if (connection->authentication_flags & AUTH_FLAG_SEND_IO_CAPABILITIES_REPLY){
7324             connectionClearAuthenticationFlags(connection, AUTH_FLAG_SEND_IO_CAPABILITIES_REPLY);
7325             // set authentication requirements:
7326             // - MITM = ssp_authentication_requirement (USER) | requested_security_level (dynamic)
7327             // - BONDING MODE: dedicated if requested, bondable otherwise. Drop bondable if not set for remote
7328             uint8_t authreq = hci_stack->ssp_authentication_requirement & 1;
7329             if (gap_mitm_protection_required_for_security_level(connection->requested_security_level)){
7330                 authreq |= 1;
7331             }
7332             bool bonding = hci_stack->bondable;
7333             if (connection->authentication_flags & AUTH_FLAG_RECV_IO_CAPABILITIES_RESPONSE){
7334                 // if we have received IO Cap Response, we're in responder role
7335                 bool remote_bonding = connection->io_cap_response_auth_req >= SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING;
7336                 if (bonding && !remote_bonding){
7337                     log_info("Remote not bonding, dropping local flag");
7338                     bonding = false;
7339                 }
7340             }
7341             if (bonding){
7342                 if (connection->bonding_flags & BONDING_DEDICATED){
7343                     authreq |= SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING;
7344                 } else {
7345                     authreq |= SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING;
7346                 }
7347             }
7348             uint8_t have_oob_data = 0;
7349 #ifdef ENABLE_CLASSIC_PAIRING_OOB
7350             if (connection->classic_oob_c_192 != NULL){
7351                     have_oob_data |= 1;
7352             }
7353             if (connection->classic_oob_c_256 != NULL){
7354                 have_oob_data |= 2;
7355             }
7356 #endif
7357             hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack->ssp_io_capability, have_oob_data, authreq);
7358             return true;
7359         }
7360 
7361         if (connection->authentication_flags & AUTH_FLAG_SEND_IO_CAPABILITIES_NEGATIVE_REPLY) {
7362             connectionClearAuthenticationFlags(connection, AUTH_FLAG_SEND_IO_CAPABILITIES_NEGATIVE_REPLY);
7363             hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED);
7364             return true;
7365         }
7366 
7367 #ifdef ENABLE_CLASSIC_PAIRING_OOB
7368         if (connection->authentication_flags & AUTH_FLAG_SEND_REMOTE_OOB_DATA_REPLY){
7369             connectionClearAuthenticationFlags(connection, AUTH_FLAG_SEND_REMOTE_OOB_DATA_REPLY);
7370             const uint8_t zero[16] = { 0 };
7371             const uint8_t * r_192 = zero;
7372             const uint8_t * c_192 = zero;
7373             const uint8_t * r_256 = zero;
7374             const uint8_t * c_256 = zero;
7375             // verify P-256 OOB
7376             if ((connection->classic_oob_c_256 != NULL) && hci_command_supported(SUPPORTED_HCI_COMMAND_REMOTE_OOB_EXTENDED_DATA_REQUEST_REPLY)) {
7377                 c_256 = connection->classic_oob_c_256;
7378                 if (connection->classic_oob_r_256 != NULL) {
7379                     r_256 = connection->classic_oob_r_256;
7380                 }
7381             }
7382             // verify P-192 OOB
7383             if ((connection->classic_oob_c_192 != NULL)) {
7384                 c_192 = connection->classic_oob_c_192;
7385                 if (connection->classic_oob_r_192 != NULL) {
7386                     r_192 = connection->classic_oob_r_192;
7387                 }
7388             }
7389 
7390             // assess security
7391             bool need_level_4 = hci_stack->gap_secure_connections_only_mode || (connection->requested_security_level == LEVEL_4);
7392             bool can_reach_level_4 = hci_remote_sc_enabled(connection) && (c_256 != NULL);
7393             if (need_level_4 && !can_reach_level_4){
7394                 log_info("Level 4 required, but not possible -> abort");
7395                 hci_pairing_complete(connection, ERROR_CODE_INSUFFICIENT_SECURITY);
7396                 // send oob negative reply
7397                 c_256 = NULL;
7398                 c_192 = NULL;
7399             }
7400 
7401             // Reply
7402             if (c_256 != zero) {
7403                 hci_send_cmd(&hci_remote_oob_extended_data_request_reply, &connection->address, c_192, r_192, c_256, r_256);
7404             } else if (c_192 != zero){
7405                 hci_send_cmd(&hci_remote_oob_data_request_reply, &connection->address, c_192, r_192);
7406             } else {
7407                 hci_stack->classic_oob_con_handle = connection->con_handle;
7408                 hci_send_cmd(&hci_remote_oob_data_request_negative_reply, &connection->address);
7409             }
7410             return true;
7411         }
7412 #endif
7413 
7414         if (connection->authentication_flags & AUTH_FLAG_SEND_USER_CONFIRM_REPLY){
7415             connectionClearAuthenticationFlags(connection, AUTH_FLAG_SEND_USER_CONFIRM_REPLY);
7416             hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address);
7417             return true;
7418         }
7419 
7420         if (connection->authentication_flags & AUTH_FLAG_SEND_USER_CONFIRM_NEGATIVE_REPLY){
7421             connectionClearAuthenticationFlags(connection, AUTH_FLAG_SEND_USER_CONFIRM_NEGATIVE_REPLY);
7422             hci_send_cmd(&hci_user_confirmation_request_negative_reply, &connection->address);
7423             return true;
7424         }
7425 
7426         if (connection->authentication_flags & AUTH_FLAG_SEND_USER_PASSKEY_REPLY){
7427             connectionClearAuthenticationFlags(connection, AUTH_FLAG_SEND_USER_PASSKEY_REPLY);
7428             hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000);
7429             return true;
7430         }
7431 
7432         if ((connection->bonding_flags & (BONDING_DISCONNECT_DEDICATED_DONE | BONDING_DEDICATED_DEFER_DISCONNECT)) == BONDING_DISCONNECT_DEDICATED_DONE){
7433             connection->bonding_flags &= ~BONDING_DISCONNECT_DEDICATED_DONE;
7434             connection->bonding_flags |= BONDING_EMIT_COMPLETE_ON_DISCONNECT;
7435             connection->state = SENT_DISCONNECT;
7436             hci_send_cmd(&hci_disconnect, connection->con_handle, ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION);
7437             return true;
7438         }
7439 
7440         if ((connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST) && ((connection->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) != 0)){
7441             connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST;
7442             connection->bonding_flags |= BONDING_SENT_AUTHENTICATE_REQUEST;
7443             hci_send_cmd(&hci_authentication_requested, connection->con_handle);
7444             return true;
7445         }
7446 
7447         if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){
7448             connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST;
7449             hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1);
7450             return true;
7451         }
7452 
7453         if (connection->bonding_flags & BONDING_SEND_READ_ENCRYPTION_KEY_SIZE){
7454             connection->bonding_flags &= ~BONDING_SEND_READ_ENCRYPTION_KEY_SIZE;
7455             hci_send_cmd(&hci_read_encryption_key_size, connection->con_handle, 1);
7456             return true;
7457         }
7458 
7459         if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES_PAGE_0){
7460             connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES_PAGE_0;
7461             hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle);
7462             return true;
7463         }
7464 
7465         if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES_PAGE_1){
7466             connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES_PAGE_1;
7467             hci_send_cmd(&hci_read_remote_extended_features_command, connection->con_handle, 1);
7468             return true;
7469         }
7470 
7471         if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES_PAGE_2){
7472             connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES_PAGE_2;
7473             hci_send_cmd(&hci_read_remote_extended_features_command, connection->con_handle, 2);
7474             return true;
7475         }
7476 #endif
7477 
7478         if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){
7479             connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK;
7480 #ifdef ENABLE_CLASSIC
7481             hci_pairing_complete(connection, ERROR_CODE_CONNECTION_REJECTED_DUE_TO_SECURITY_REASONS);
7482 #endif
7483             if (connection->state != SENT_DISCONNECT){
7484                 connection->state = SENT_DISCONNECT;
7485                 hci_send_cmd(&hci_disconnect, connection->con_handle, ERROR_CODE_AUTHENTICATION_FAILURE);
7486                 return true;
7487             }
7488         }
7489 
7490 #ifdef ENABLE_CLASSIC
7491         uint16_t sniff_min_interval;
7492         switch (connection->sniff_min_interval){
7493             case 0:
7494                 break;
7495             case 0xffff:
7496                 connection->sniff_min_interval = 0;
7497                 hci_send_cmd(&hci_exit_sniff_mode, connection->con_handle);
7498                 return true;
7499             default:
7500                 sniff_min_interval = connection->sniff_min_interval;
7501                 connection->sniff_min_interval = 0;
7502                 hci_send_cmd(&hci_sniff_mode, connection->con_handle, connection->sniff_max_interval, sniff_min_interval, connection->sniff_attempt, connection->sniff_timeout);
7503                 return true;
7504         }
7505 
7506         if (connection->sniff_subrating_max_latency != 0xffff){
7507             uint16_t max_latency = connection->sniff_subrating_max_latency;
7508             connection->sniff_subrating_max_latency = 0;
7509             hci_send_cmd(&hci_sniff_subrating, connection->con_handle, max_latency, connection->sniff_subrating_min_remote_timeout, connection->sniff_subrating_min_local_timeout);
7510             return true;
7511         }
7512 
7513         if (connection->qos_service_type != HCI_SERVICE_TYPE_INVALID){
7514             uint8_t service_type = (uint8_t) connection->qos_service_type;
7515             connection->qos_service_type = HCI_SERVICE_TYPE_INVALID;
7516             hci_send_cmd(&hci_qos_setup, connection->con_handle, 0, service_type, connection->qos_token_rate, connection->qos_peak_bandwidth, connection->qos_latency, connection->qos_delay_variation);
7517             return true;
7518         }
7519 
7520         if (connection->request_role != HCI_ROLE_INVALID){
7521             hci_role_t role = connection->request_role;
7522             connection->request_role = HCI_ROLE_INVALID;
7523             hci_send_cmd(&hci_switch_role_command, connection->address, role);
7524             return true;
7525         }
7526 #endif
7527 
7528         if (connection->gap_connection_tasks != 0){
7529 #ifdef ENABLE_CLASSIC
7530             if ((connection->gap_connection_tasks & GAP_CONNECTION_TASK_WRITE_AUTOMATIC_FLUSH_TIMEOUT) != 0){
7531                 connection->gap_connection_tasks &= ~GAP_CONNECTION_TASK_WRITE_AUTOMATIC_FLUSH_TIMEOUT;
7532                 hci_send_cmd(&hci_write_automatic_flush_timeout, connection->con_handle, hci_stack->automatic_flush_timeout);
7533                 return true;
7534             }
7535             if (connection->gap_connection_tasks & GAP_CONNECTION_TASK_WRITE_SUPERVISION_TIMEOUT){
7536                 connection->gap_connection_tasks &= ~GAP_CONNECTION_TASK_WRITE_SUPERVISION_TIMEOUT;
7537                 hci_send_cmd(&hci_write_link_supervision_timeout, connection->con_handle, hci_stack->link_supervision_timeout);
7538                 return true;
7539             }
7540 #endif
7541             if (connection->gap_connection_tasks & GAP_CONNECTION_TASK_READ_RSSI){
7542                 connection->gap_connection_tasks &= ~GAP_CONNECTION_TASK_READ_RSSI;
7543                 hci_send_cmd(&hci_read_rssi, connection->con_handle);
7544                 return true;
7545             }
7546 #ifdef ENABLE_BLE
7547             if (connection->gap_connection_tasks & GAP_CONNECTION_TASK_LE_READ_REMOTE_FEATURES){
7548                 connection->gap_connection_tasks &= ~GAP_CONNECTION_TASK_LE_READ_REMOTE_FEATURES;
7549                 hci_send_cmd(&hci_le_read_remote_used_features, connection->con_handle);
7550                 return true;
7551             }
7552 #endif
7553         }
7554 
7555 #ifdef ENABLE_BLE
7556         switch (connection->le_con_parameter_update_state){
7557             // response to L2CAP CON PARAMETER UPDATE REQUEST
7558             case CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS:
7559                 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE;
7560                 hci_send_cmd(&hci_le_connection_update, connection->con_handle, connection->le_conn_interval_min,
7561                              connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout,
7562                              hci_stack->le_minimum_ce_length, hci_stack->le_maximum_ce_length);
7563                 return true;
7564             case CON_PARAMETER_UPDATE_REPLY:
7565                 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE;
7566                 hci_send_cmd(&hci_le_remote_connection_parameter_request_reply, connection->con_handle, connection->le_conn_interval_min,
7567                              connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout,
7568                              hci_stack->le_minimum_ce_length, hci_stack->le_maximum_ce_length);
7569                 return true;
7570             case CON_PARAMETER_UPDATE_NEGATIVE_REPLY:
7571                 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE;
7572                 hci_send_cmd(&hci_le_remote_connection_parameter_request_negative_reply, connection->con_handle,
7573                              ERROR_CODE_UNACCEPTABLE_CONNECTION_PARAMETERS);
7574                 return true;
7575             default:
7576                 break;
7577         }
7578         if (connection->le_phy_update_all_phys != 0xffu){
7579             uint8_t all_phys = connection->le_phy_update_all_phys;
7580             connection->le_phy_update_all_phys = 0xff;
7581             hci_send_cmd(&hci_le_set_phy, connection->con_handle, all_phys, connection->le_phy_update_tx_phys, connection->le_phy_update_rx_phys, connection->le_phy_update_phy_options);
7582             return true;
7583         }
7584 #ifdef ENABLE_LE_PERIODIC_ADVERTISING
7585         if (connection->le_past_sync_handle != HCI_CON_HANDLE_INVALID){
7586             hci_con_handle_t sync_handle = connection->le_past_sync_handle;
7587             connection->le_past_sync_handle = HCI_CON_HANDLE_INVALID;
7588             hci_send_cmd(&hci_le_periodic_advertising_sync_transfer, connection->con_handle, connection->le_past_service_data, sync_handle);
7589             return true;
7590         }
7591         if (connection->le_past_advertising_handle != 0xff){
7592             uint8_t advertising_handle = connection->le_past_advertising_handle;
7593             connection->le_past_advertising_handle = 0xff;
7594             hci_send_cmd(&hci_le_periodic_advertising_set_info_transfer, connection->con_handle, connection->le_past_service_data, advertising_handle);
7595             return true;
7596         }
7597 #endif
7598 #endif
7599     }
7600     return false;
7601 }
7602 
7603 static void hci_run(void){
7604 
7605     // stack state sub statemachines
7606     switch (hci_stack->state) {
7607         case HCI_STATE_INITIALIZING:
7608             hci_initializing_run();
7609             break;
7610         case HCI_STATE_HALTING:
7611             hci_halting_run();
7612             break;
7613         case HCI_STATE_FALLING_ASLEEP:
7614             hci_falling_asleep_run();
7615             break;
7616         default:
7617             break;
7618     }
7619 
7620     // allow to run after initialization to working transition
7621     if (hci_stack->state != HCI_STATE_WORKING){
7622         return;
7623     }
7624 
7625     bool done;
7626 
7627     // send continuation fragments first, as they block the prepared packet buffer
7628     done = hci_run_acl_fragments();
7629     if (done) return;
7630 
7631 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
7632     done = hci_run_iso_fragments();
7633     if (done) return;
7634 #endif
7635 
7636 #ifdef ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL
7637     // send host num completed packets next as they don't require num_cmd_packets > 0
7638     if (!hci_can_send_command_packet_transport()) return;
7639     if (hci_stack->host_completed_packets){
7640         hci_host_num_completed_packets();
7641         return;
7642     }
7643 #endif
7644 
7645     if (!hci_can_send_command_packet_now()) return;
7646 
7647     // global/non-connection oriented commands
7648 
7649 
7650 #ifdef ENABLE_CLASSIC
7651     // general gap classic
7652     done = hci_run_general_gap_classic();
7653     if (done) return;
7654 #endif
7655 
7656 #ifdef ENABLE_BLE
7657     // general gap le
7658     done = hci_run_general_gap_le();
7659     if (done) return;
7660 
7661 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
7662     // ISO related tasks, e.g. BIG create/terminate/sync
7663     done = hci_run_iso_tasks();
7664     if (done) return;
7665 #endif
7666 #endif
7667 
7668     // send pending HCI commands
7669     hci_run_general_pending_commands();
7670 }
7671 
7672 #ifdef ENABLE_CLASSIC
7673 static void hci_set_sco_payload_length_for_flipped_packet_types(hci_connection_t * hci_connection, uint16_t flipped_packet_types){
7674     // bits 6-9 are 'don't use'
7675     uint16_t packet_types = flipped_packet_types ^ 0x03c0;
7676 
7677     // restrict packet types to local and remote supported
7678     packet_types &= hci_connection->remote_supported_sco_packets & hci_stack->usable_packet_types_sco;
7679     hci_connection->sco_payload_length = hci_sco_payload_length_for_packet_types(packet_types);
7680     log_info("Possible SCO packet types 0x%04x => payload length %u", packet_types, hci_connection->sco_payload_length);
7681 }
7682 #endif
7683 
7684 // funnel for sending cmd packet using single outgoing buffer
7685 static uint8_t hci_send_prepared_cmd_packet(void) {
7686     btstack_assert(hci_stack->hci_packet_buffer_reserved);
7687     // cache opcode
7688     hci_stack->last_cmd_opcode = little_endian_read_16(hci_stack->hci_packet_buffer, 0);
7689     // get size
7690     uint16_t size = 3u + hci_stack->hci_packet_buffer[2u];
7691     // send packet
7692     uint8_t status = hci_send_cmd_packet(hci_stack->hci_packet_buffer, size);
7693     // release packet buffer on error or for synchronous transport implementations
7694     if ((status != ERROR_CODE_SUCCESS) || hci_transport_synchronous()){
7695         hci_release_packet_buffer();
7696     }
7697     return status;
7698 }
7699 
7700 uint8_t hci_send_cmd_packet(uint8_t *packet, int size){
7701     // house-keeping
7702 
7703 #ifdef ENABLE_CLASSIC
7704     bd_addr_t addr;
7705     hci_connection_t * conn;
7706 #endif
7707 #ifdef ENABLE_LE_CENTRAL
7708     uint8_t initiator_filter_policy;
7709 #endif
7710 
7711     uint16_t opcode = little_endian_read_16(packet, 0);
7712     switch (opcode) {
7713         case HCI_OPCODE_HCI_WRITE_LOOPBACK_MODE:
7714             hci_stack->loopback_mode = packet[3];
7715             break;
7716 
7717 #ifdef ENABLE_CLASSIC
7718         case HCI_OPCODE_HCI_CREATE_CONNECTION:
7719             reverse_bd_addr(&packet[3], addr);
7720             log_info("Create_connection to %s", bd_addr_to_str(addr));
7721 
7722             // CVE-2020-26555: reject outgoing connection to device with same BD ADDR
7723             if (memcmp(hci_stack->local_bd_addr, addr, 6) == 0) {
7724                 hci_emit_connection_complete(addr, 0, ERROR_CODE_CONNECTION_REJECTED_DUE_TO_UNACCEPTABLE_BD_ADDR);
7725                 return ERROR_CODE_CONNECTION_REJECTED_DUE_TO_UNACCEPTABLE_BD_ADDR;
7726             }
7727 
7728             conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL);
7729             if (!conn) {
7730                 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL, HCI_ROLE_MASTER);
7731                 if (!conn) {
7732                     // notify client that alloc failed
7733                     hci_emit_connection_complete(addr, 0, BTSTACK_MEMORY_ALLOC_FAILED);
7734                     return BTSTACK_MEMORY_ALLOC_FAILED; // packet not sent to controller
7735                 }
7736                 conn->state = SEND_CREATE_CONNECTION;
7737             }
7738 
7739             log_info("conn state %u", conn->state);
7740             // TODO: L2CAP should not send create connection command, instead a (new) gap function should be used
7741             switch (conn->state) {
7742                 // if connection active exists
7743                 case OPEN:
7744                     // and OPEN, emit connection complete command
7745                     hci_emit_connection_complete(addr, conn->con_handle, ERROR_CODE_SUCCESS);
7746                     // packet not sent to controller
7747                     return ERROR_CODE_ACL_CONNECTION_ALREADY_EXISTS;
7748                 case RECEIVED_DISCONNECTION_COMPLETE:
7749                     // create connection triggered in disconnect complete event, let's do it now
7750                     break;
7751                 case SEND_CREATE_CONNECTION:
7752 #ifdef ENABLE_HCI_SERIALIZED_CONTROLLER_OPERATIONS
7753                     if (hci_classic_operation_active()){
7754                         return ERROR_CODE_SUCCESS;
7755                     }
7756 #endif
7757                     // connection created by hci, e.g. dedicated bonding, but not executed yet, let's do it now
7758                     break;
7759                 default:
7760                     // otherwise, just ignore as it is already in the open process
7761                     // packet not sent to controller
7762                     return ERROR_CODE_ACL_CONNECTION_ALREADY_EXISTS;
7763             }
7764             conn->state = SENT_CREATE_CONNECTION;
7765 
7766             // track outgoing connection
7767             hci_stack->outgoing_addr_type = BD_ADDR_TYPE_ACL;
7768             (void) memcpy(hci_stack->outgoing_addr, addr, 6);
7769             break;
7770 
7771         case HCI_OPCODE_HCI_SETUP_SYNCHRONOUS_CONNECTION:
7772             conn = hci_connection_for_handle(little_endian_read_16(packet, 3));
7773             if (conn == NULL) {
7774                 // neither SCO nor ACL connection for con handle
7775                 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
7776             } else {
7777                 uint16_t remote_supported_sco_packets;
7778                 switch (conn->address_type){
7779                     case BD_ADDR_TYPE_ACL:
7780                         // assert SCO connection does not exit
7781                         if (hci_connection_for_bd_addr_and_type(conn->address, BD_ADDR_TYPE_SCO) != NULL){
7782                             return ERROR_CODE_COMMAND_DISALLOWED;
7783                         }
7784                         // cache remote sco packet types
7785                         remote_supported_sco_packets = conn->remote_supported_sco_packets;
7786 
7787                         // allocate connection struct
7788                         conn = create_connection_for_bd_addr_and_type(conn->address, BD_ADDR_TYPE_SCO,
7789                                                                       HCI_ROLE_MASTER);
7790                         if (!conn) {
7791                             return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED;
7792                         }
7793                         conn->remote_supported_sco_packets = remote_supported_sco_packets;
7794                         break;
7795                     case BD_ADDR_TYPE_SCO:
7796                         // update of existing SCO connection
7797                         break;
7798                     default:
7799                         return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS;
7800                 }
7801             }
7802 
7803             // conn refers to hci connection of type sco now
7804 
7805             conn->state = SENT_CREATE_CONNECTION;
7806 
7807             // track outgoing connection to handle command status with error
7808             hci_stack->outgoing_addr_type = BD_ADDR_TYPE_SCO;
7809             (void) memcpy(hci_stack->outgoing_addr, conn->address, 6);
7810 
7811             // setup_synchronous_connection? Voice setting at offset 22
7812             // TODO: compare to current setting if sco connection already active
7813             hci_stack->sco_voice_setting_active = little_endian_read_16(packet, 15);
7814 
7815             // derive sco payload length from packet types
7816             hci_set_sco_payload_length_for_flipped_packet_types(conn, little_endian_read_16(packet, 18));
7817             break;
7818 
7819         case HCI_OPCODE_HCI_ACCEPT_SYNCHRONOUS_CONNECTION:
7820             // get SCO connection
7821             reverse_bd_addr(&packet[3], addr);
7822             conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_SCO);
7823             if (conn == NULL){
7824                 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
7825             }
7826 
7827             conn->state = ACCEPTED_CONNECTION_REQUEST;
7828 
7829             // track outgoing connection to handle command status with error
7830             hci_stack->outgoing_addr_type = BD_ADDR_TYPE_SCO;
7831             (void) memcpy(hci_stack->outgoing_addr, addr, 6);
7832 
7833             // accept_synchronous_connection? Voice setting at offset 18
7834             // TODO: compare to current setting if sco connection already active
7835             hci_stack->sco_voice_setting_active = little_endian_read_16(packet, 19);
7836 
7837             // derive sco payload length from packet types
7838             hci_set_sco_payload_length_for_flipped_packet_types(conn, little_endian_read_16(packet, 22));
7839             break;
7840 #endif
7841 
7842 #ifdef ENABLE_BLE
7843 #ifdef ENABLE_LE_CENTRAL
7844         case HCI_OPCODE_HCI_LE_CREATE_CONNECTION:
7845             // white list used?
7846             initiator_filter_policy = packet[7];
7847             switch (initiator_filter_policy) {
7848                 case 0:
7849                     // whitelist not used
7850                     hci_stack->le_connecting_state = LE_CONNECTING_DIRECT;
7851                     break;
7852                 case 1:
7853                     hci_stack->le_connecting_state = LE_CONNECTING_WHITELIST;
7854                     break;
7855                 default:
7856                     log_error("Invalid initiator_filter_policy in LE Create Connection %u", initiator_filter_policy);
7857                     break;
7858             }
7859             // track outgoing connection
7860             hci_stack->outgoing_addr_type = (bd_addr_type_t) packet[8]; // peer address type
7861             reverse_bd_addr( &packet[9], hci_stack->outgoing_addr); // peer address
7862             break;
7863 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
7864         case HCI_OPCODE_HCI_LE_EXTENDED_CREATE_CONNECTION:
7865             // white list used?
7866             initiator_filter_policy = packet[3];
7867             switch (initiator_filter_policy) {
7868                 case 0:
7869                     // whitelist not used
7870                     hci_stack->le_connecting_state = LE_CONNECTING_DIRECT;
7871                     break;
7872                 case 1:
7873                     hci_stack->le_connecting_state = LE_CONNECTING_WHITELIST;
7874                     break;
7875                 default:
7876                     log_error("Invalid initiator_filter_policy in LE Create Connection %u", initiator_filter_policy);
7877                     break;
7878             }
7879             // track outgoing connection
7880             hci_stack->outgoing_addr_type = (bd_addr_type_t) packet[5]; // peer address type
7881             reverse_bd_addr( &packet[6], hci_stack->outgoing_addr); // peer address
7882             break;
7883 #endif
7884         case HCI_OPCODE_HCI_LE_CREATE_CONNECTION_CANCEL:
7885             hci_stack->le_connecting_state = LE_CONNECTING_CANCEL;
7886             break;
7887 #endif
7888 #ifdef ENABLE_HCI_COMMAND_STATUS_DISCARDED_FOR_FAILED_CONNECTIONS_WORKAROUND
7889         case HCI_OPCODE_HCI_LE_CONNECTION_UPDATE:
7890         case HCI_OPCODE_HCI_LE_READ_REMOTE_USED_FEATURES:
7891         case HCI_OPCODE_HCI_LE_START_ENCRYPTION:
7892         case HCI_OPCODE_HCI_LE_LONG_TERM_KEY_REQUEST_REPLY:
7893         case HCI_OPCODE_HCI_LE_LONG_TERM_KEY_NEGATIVE_REPLY:
7894         case HCI_OPCODE_HCI_LE_REMOTE_CONNECTION_PARAMETER_REQUEST_REPLY:
7895         case HCI_OPCODE_HCI_LE_REMOTE_CONNECTION_PARAMETER_REQUEST_NEGATIVE_REPLY:
7896         case HCI_OPCODE_HCI_LE_SET_DATA_LENGTH:
7897         case HCI_OPCODE_HCI_LE_READ_PHY:
7898         case HCI_OPCODE_HCI_LE_SET_PHY:
7899             // conection handle is first command parameter
7900             hci_stack->hci_command_con_handle = little_endian_read_16(packet, 3);
7901             break;
7902 #endif
7903 #endif /* ENABLE_BLE */
7904         default:
7905             break;
7906     }
7907 
7908     hci_stack->num_cmd_packets--;
7909 
7910     hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, packet, size);
7911     int err = hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size);
7912     uint8_t status;
7913     if (err == 0){
7914         status = ERROR_CODE_SUCCESS;
7915     } else {
7916         status = ERROR_CODE_HARDWARE_FAILURE;
7917     }
7918     return status;
7919 }
7920 
7921 // disconnect because of security block
7922 void hci_disconnect_security_block(hci_con_handle_t con_handle){
7923     hci_connection_t * connection = hci_connection_for_handle(con_handle);
7924     if (!connection) return;
7925     connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK;
7926 }
7927 
7928 
7929 // Configure Secure Simple Pairing
7930 
7931 #ifdef ENABLE_CLASSIC
7932 
7933 // enable will enable SSP during init
7934 void gap_ssp_set_enable(int enable){
7935     hci_stack->ssp_enable = enable;
7936 }
7937 
7938 static int hci_local_ssp_activated(void){
7939     return gap_ssp_supported() && hci_stack->ssp_enable;
7940 }
7941 
7942 // if set, BTstack will respond to io capability request using authentication requirement
7943 void gap_ssp_set_io_capability(int io_capability){
7944     hci_stack->ssp_io_capability = io_capability;
7945 }
7946 void gap_ssp_set_authentication_requirement(int authentication_requirement){
7947     hci_stack->ssp_authentication_requirement = authentication_requirement;
7948 }
7949 
7950 // if set, BTstack will confirm a numeric comparison and enter '000000' if requested
7951 void gap_ssp_set_auto_accept(int auto_accept){
7952     hci_stack->ssp_auto_accept = auto_accept;
7953 }
7954 
7955 void gap_secure_connections_enable(bool enable){
7956     hci_stack->secure_connections_enable = enable;
7957 }
7958 bool gap_secure_connections_active(void){
7959     return hci_stack->secure_connections_active;
7960 }
7961 
7962 #endif
7963 
7964 // va_list part of hci_send_cmd
7965 uint8_t hci_send_cmd_va_arg(const hci_cmd_t * cmd, va_list argptr){
7966     if (!hci_can_send_command_packet_now()){
7967         log_error("hci_send_cmd called but cannot send packet now");
7968         return ERROR_CODE_COMMAND_DISALLOWED;
7969     }
7970 
7971     hci_reserve_packet_buffer();
7972     hci_cmd_create_from_template(hci_stack->hci_packet_buffer, cmd, argptr);
7973     return hci_send_prepared_cmd_packet();
7974 }
7975 
7976 /**
7977  * pre: num_commands >= 0 - it's allowed to send a command to the controller
7978  */
7979 uint8_t hci_send_cmd(const hci_cmd_t * cmd, ...){
7980     va_list argptr;
7981     va_start(argptr, cmd);
7982     uint8_t status = hci_send_cmd_va_arg(cmd, argptr);
7983     va_end(argptr);
7984     return status;
7985 }
7986 
7987 // Forward HCI events and create non-HCI events
7988 
7989 static void hci_emit_event(uint8_t * event, uint16_t size, int dump){
7990     // dump packet
7991     if (dump) {
7992         hci_dump_packet( HCI_EVENT_PACKET, 1, event, size);
7993     }
7994 
7995     // dispatch to all event handlers
7996     btstack_linked_list_iterator_t it;
7997     btstack_linked_list_iterator_init(&it, &hci_stack->event_handlers);
7998     while (btstack_linked_list_iterator_has_next(&it)){
7999         btstack_packet_callback_registration_t * entry = (btstack_packet_callback_registration_t*) btstack_linked_list_iterator_next(&it);
8000         entry->callback(HCI_EVENT_PACKET, 0, event, size);
8001     }
8002 }
8003 
8004 static void hci_emit_btstack_event(uint8_t * event, uint16_t size, int dump){
8005 #ifndef ENABLE_LOG_BTSTACK_EVENTS
8006     dump = 0;
8007 #endif
8008     hci_emit_event(event, size, dump);
8009 }
8010 
8011 static void hci_emit_acl_packet(uint8_t * packet, uint16_t size){
8012     if (!hci_stack->acl_packet_handler) return;
8013     hci_stack->acl_packet_handler(HCI_ACL_DATA_PACKET, 0, packet, size);
8014 }
8015 
8016 #ifdef ENABLE_CLASSIC
8017 static void hci_notify_if_sco_can_send_now(void){
8018     // notify SCO sender if waiting
8019     if (!hci_stack->sco_waiting_for_can_send_now) return;
8020     if (hci_can_send_sco_packet_now()){
8021         hci_stack->sco_waiting_for_can_send_now = 0;
8022         uint8_t event[2] = { HCI_EVENT_SCO_CAN_SEND_NOW, 0 };
8023         hci_dump_btstack_event(event, sizeof(event));
8024         hci_stack->sco_packet_handler(HCI_EVENT_PACKET, 0, event, sizeof(event));
8025     }
8026 }
8027 
8028 // parsing end emitting has been merged to reduce code size
8029 static void gap_inquiry_explode(uint8_t *packet, uint16_t size) {
8030     uint8_t event[28+GAP_INQUIRY_MAX_NAME_LEN];
8031 
8032     uint8_t * eir_data;
8033     ad_context_t context;
8034     const uint8_t * name;
8035     uint8_t         name_len;
8036 
8037     if (size < 3) return;
8038 
8039     int event_type = hci_event_packet_get_type(packet);
8040     int num_reserved_fields = (event_type == HCI_EVENT_INQUIRY_RESULT) ? 2 : 1;    // 2 for old event, 1 otherwise
8041     int num_responses       = hci_event_inquiry_result_get_num_responses(packet);
8042 
8043     switch (event_type){
8044         case HCI_EVENT_INQUIRY_RESULT:
8045         case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:
8046             if (size != (3 + (num_responses * 14))) return;
8047             break;
8048         case HCI_EVENT_EXTENDED_INQUIRY_RESPONSE:
8049             if (size != 257) return;
8050             if (num_responses != 1) return;
8051             break;
8052         default:
8053             return;
8054     }
8055 
8056     // event[1] is set at the end
8057     int i;
8058     for (i=0; i<num_responses;i++){
8059         memset(event, 0, sizeof(event));
8060         event[0] = GAP_EVENT_INQUIRY_RESULT;
8061         uint8_t event_size = 27;    // if name is not set by EIR
8062 
8063         (void)memcpy(&event[2], &packet[3 + (i * 6)], 6); // bd_addr
8064         event[8] =          packet[3 + (num_responses*(6))                         + (i*1)];     // page_scan_repetition_mode
8065         (void)memcpy(&event[9],
8066                      &packet[3 + (num_responses * (6 + 1 + num_reserved_fields)) + (i * 3)],
8067                      3); // class of device
8068         (void)memcpy(&event[12],
8069                      &packet[3 + (num_responses * (6 + 1 + num_reserved_fields + 3)) + (i * 2)],
8070                      2); // clock offset
8071 
8072         switch (event_type){
8073             case HCI_EVENT_INQUIRY_RESULT:
8074                 // 14,15,16,17 = 0, size 18
8075                 break;
8076             case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:
8077                 event[14] = 1;
8078                 event[15] = packet [3 + (num_responses*(6+1+num_reserved_fields+3+2)) + (i*1)]; // rssi
8079                 // 16,17 = 0, size 18
8080                 break;
8081             case HCI_EVENT_EXTENDED_INQUIRY_RESPONSE:
8082                 event[14] = 1;
8083                 event[15] = packet [3 + (num_responses*(6+1+num_reserved_fields+3+2)) + (i*1)]; // rssi
8084                 // EIR packets only contain a single inquiry response
8085                 eir_data = &packet[3 + (6+1+num_reserved_fields+3+2+1)];
8086                 name = NULL;
8087                 // Iterate over EIR data
8088                 for (ad_iterator_init(&context, EXTENDED_INQUIRY_RESPONSE_DATA_LEN, eir_data) ; ad_iterator_has_more(&context) ; ad_iterator_next(&context)){
8089                     uint8_t data_type    = ad_iterator_get_data_type(&context);
8090                     uint8_t data_size    = ad_iterator_get_data_len(&context);
8091                     const uint8_t * data = ad_iterator_get_data(&context);
8092                     // Prefer Complete Local Name over Shortened Local Name
8093                     switch (data_type){
8094                         case BLUETOOTH_DATA_TYPE_SHORTENED_LOCAL_NAME:
8095                             if (name) continue;
8096                             /* fall through */
8097                         case BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME:
8098                             name = data;
8099                             name_len = data_size;
8100                             break;
8101                         case BLUETOOTH_DATA_TYPE_DEVICE_ID:
8102                             if (data_size != 8) break;
8103                             event[16] = 1;
8104                             memcpy(&event[17], data, 8);
8105                             break;
8106                         default:
8107                             break;
8108                     }
8109                 }
8110                 if (name){
8111                     event[25] = 1;
8112                     // truncate name if needed
8113                     int len = btstack_min(name_len, GAP_INQUIRY_MAX_NAME_LEN);
8114                     event[26] = len;
8115                     (void)memcpy(&event[27], name, len);
8116                     event_size += len;
8117                 }
8118                 break;
8119             default:
8120                 return;
8121         }
8122         event[1] = event_size - 2;
8123         hci_emit_btstack_event(event, event_size, 1);
8124     }
8125 }
8126 #endif
8127 
8128 void hci_emit_state(void){
8129     log_info("BTSTACK_EVENT_STATE %u", hci_stack->state);
8130     uint8_t event[3];
8131     event[0] = BTSTACK_EVENT_STATE;
8132     event[1] = sizeof(event) - 2u;
8133     event[2] = hci_stack->state;
8134     hci_emit_btstack_event(event, sizeof(event), 1);
8135 }
8136 
8137 #ifdef ENABLE_CLASSIC
8138 static void hci_emit_connection_complete(bd_addr_t address, hci_con_handle_t con_handle, uint8_t status){
8139     uint8_t event[13];
8140     event[0] = HCI_EVENT_CONNECTION_COMPLETE;
8141     event[1] = sizeof(event) - 2;
8142     event[2] = status;
8143     little_endian_store_16(event, 3, con_handle);
8144     reverse_bd_addr(address, &event[5]);
8145     event[11] = 1; // ACL connection
8146     event[12] = 0; // encryption disabled
8147     hci_emit_btstack_event(event, sizeof(event), 1);
8148 }
8149 static void hci_emit_l2cap_check_timeout(hci_connection_t *conn){
8150     if (disable_l2cap_timeouts) return;
8151     log_info("L2CAP_EVENT_TIMEOUT_CHECK");
8152     uint8_t event[4];
8153     event[0] = L2CAP_EVENT_TIMEOUT_CHECK;
8154     event[1] = sizeof(event) - 2;
8155     little_endian_store_16(event, 2, conn->con_handle);
8156     hci_emit_btstack_event(event, sizeof(event), 1);
8157 }
8158 #endif
8159 
8160 #ifdef ENABLE_BLE
8161 #ifdef ENABLE_LE_CENTRAL
8162 static void hci_emit_le_connection_complete(uint8_t address_type, const bd_addr_t address, hci_con_handle_t con_handle, uint8_t status){
8163     uint8_t hci_event[21];
8164     hci_event[0] = HCI_EVENT_LE_META;
8165     hci_event[1] = sizeof(hci_event) - 2u;
8166     hci_event[2] = HCI_SUBEVENT_LE_CONNECTION_COMPLETE;
8167     hci_event[3] = status;
8168     little_endian_store_16(hci_event, 4, con_handle);
8169     hci_event[6] = 0; // TODO: role
8170     hci_event[7] = address_type;
8171     reverse_bd_addr(address, &hci_event[8]);
8172     little_endian_store_16(hci_event, 14, 0); // interval
8173     little_endian_store_16(hci_event, 16, 0); // latency
8174     little_endian_store_16(hci_event, 18, 0); // supervision timeout
8175     hci_event[20] = 0; // master clock accuracy
8176     hci_emit_btstack_event(hci_event, sizeof(hci_event), 1);
8177     // emit GAP event, too
8178     uint8_t gap_event[36];
8179     hci_create_gap_connection_complete_event(hci_event, gap_event);
8180     hci_emit_btstack_event(gap_event, sizeof(gap_event), 1);
8181 }
8182 #endif
8183 #endif
8184 
8185 static void hci_emit_transport_packet_sent(void){
8186     // notify upper stack that it might be possible to send again
8187     uint8_t event[] = { HCI_EVENT_TRANSPORT_PACKET_SENT, 0};
8188     hci_emit_btstack_event(&event[0], sizeof(event), 0);  // don't dump
8189 }
8190 
8191 static void hci_emit_disconnection_complete(hci_con_handle_t con_handle, uint8_t reason){
8192     uint8_t event[6];
8193     event[0] = HCI_EVENT_DISCONNECTION_COMPLETE;
8194     event[1] = sizeof(event) - 2u;
8195     event[2] = 0; // status = OK
8196     little_endian_store_16(event, 3, con_handle);
8197     event[5] = reason;
8198     hci_emit_btstack_event(event, sizeof(event), 1);
8199 }
8200 
8201 static void hci_emit_nr_connections_changed(void){
8202     log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections());
8203     uint8_t event[3];
8204     event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED;
8205     event[1] = sizeof(event) - 2u;
8206     event[2] = nr_hci_connections();
8207     hci_emit_btstack_event(event, sizeof(event), 1);
8208 }
8209 
8210 static void hci_emit_hci_open_failed(void){
8211     log_info("BTSTACK_EVENT_POWERON_FAILED");
8212     uint8_t event[2];
8213     event[0] = BTSTACK_EVENT_POWERON_FAILED;
8214     event[1] = sizeof(event) - 2u;
8215     hci_emit_btstack_event(event, sizeof(event), 1);
8216 }
8217 
8218 static void hci_emit_dedicated_bonding_result(bd_addr_t address, uint8_t status){
8219     log_info("hci_emit_dedicated_bonding_result %u ", status);
8220     uint8_t event[9];
8221     int pos = 0;
8222     event[pos++] = GAP_EVENT_DEDICATED_BONDING_COMPLETED;
8223     event[pos++] = sizeof(event) - 2u;
8224     event[pos++] = status;
8225     reverse_bd_addr(address, &event[pos]);
8226     hci_emit_btstack_event(event, sizeof(event), 1);
8227 }
8228 
8229 
8230 #ifdef ENABLE_CLASSIC
8231 
8232 static void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){
8233     log_info("hci_emit_security_level %u for handle %x", level, con_handle);
8234     uint8_t event[5];
8235     int pos = 0;
8236     event[pos++] = GAP_EVENT_SECURITY_LEVEL;
8237     event[pos++] = sizeof(event) - 2;
8238     little_endian_store_16(event, 2, con_handle);
8239     pos += 2;
8240     event[pos++] = level;
8241     hci_emit_btstack_event(event, sizeof(event), 1);
8242 }
8243 
8244 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){
8245     if (!connection) return LEVEL_0;
8246     if ((connection->authentication_flags & AUTH_FLAG_CONNECTION_ENCRYPTED) == 0) return LEVEL_0;
8247     // BIAS: we only consider Authenticated if the connection is already encrypted, which requires that both sides have link key
8248     if ((connection->authentication_flags & AUTH_FLAG_CONNECTION_AUTHENTICATED) == 0) return LEVEL_0;
8249     if (connection->encryption_key_size < hci_stack->gap_required_encyrption_key_size) return LEVEL_0;
8250     gap_security_level_t security_level = gap_security_level_for_link_key_type(connection->link_key_type);
8251     // LEVEL 4 always requires 128 bit encryption key size
8252     if ((security_level == LEVEL_4) && (connection->encryption_key_size < 16)){
8253         security_level = LEVEL_3;
8254     }
8255     return security_level;
8256 }
8257 
8258 static void hci_emit_scan_mode_changed(uint8_t discoverable, uint8_t connectable){
8259     uint8_t event[4];
8260     event[0] = BTSTACK_EVENT_SCAN_MODE_CHANGED;
8261     event[1] = sizeof(event) - 2;
8262     event[2] = discoverable;
8263     event[3] = connectable;
8264     hci_emit_btstack_event(event, sizeof(event), 1);
8265 }
8266 
8267 // query if remote side supports eSCO
8268 bool hci_remote_esco_supported(hci_con_handle_t con_handle){
8269     hci_connection_t * connection = hci_connection_for_handle(con_handle);
8270     if (!connection) return false;
8271     return (connection->remote_supported_features[0] & 1) != 0;
8272 }
8273 
8274 uint16_t hci_remote_sco_packet_types(hci_con_handle_t con_handle){
8275     hci_connection_t * connection = hci_connection_for_handle(con_handle);
8276     if (!connection) return 0;
8277     return connection->remote_supported_sco_packets;
8278 }
8279 
8280 static bool hci_ssp_supported(hci_connection_t * connection){
8281     const uint8_t mask = BONDING_REMOTE_SUPPORTS_SSP_CONTROLLER | BONDING_REMOTE_SUPPORTS_SSP_HOST;
8282     return (connection->bonding_flags & mask) == mask;
8283 }
8284 
8285 // query if remote side supports SSP
8286 bool hci_remote_ssp_supported(hci_con_handle_t con_handle){
8287     hci_connection_t * connection = hci_connection_for_handle(con_handle);
8288     if (!connection) return false;
8289     return hci_ssp_supported(connection) ? 1 : 0;
8290 }
8291 
8292 bool gap_ssp_supported_on_both_sides(hci_con_handle_t handle){
8293     return hci_local_ssp_activated() && hci_remote_ssp_supported(handle);
8294 }
8295 
8296 /**
8297  * Check if remote supported features query has completed
8298  */
8299 bool hci_remote_features_available(hci_con_handle_t handle){
8300     hci_connection_t * connection = hci_connection_for_handle(handle);
8301     if (!connection) return false;
8302     return (connection->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) != 0;
8303 }
8304 
8305 /**
8306  * Trigger remote supported features query
8307  */
8308 
8309 static void hci_trigger_remote_features_for_connection(hci_connection_t * connection){
8310     if ((connection->bonding_flags & (BONDING_REMOTE_FEATURES_QUERY_ACTIVE | BONDING_RECEIVED_REMOTE_FEATURES)) == 0){
8311         connection->bonding_flags |= BONDING_REMOTE_FEATURES_QUERY_ACTIVE | BONDING_REQUEST_REMOTE_FEATURES_PAGE_0;
8312     }
8313 }
8314 
8315 void hci_remote_features_query(hci_con_handle_t con_handle){
8316     hci_connection_t * connection = hci_connection_for_handle(con_handle);
8317     if (!connection) return;
8318     hci_trigger_remote_features_for_connection(connection);
8319     hci_run();
8320 }
8321 
8322 // GAP API
8323 /**
8324  * @bbrief enable/disable bonding. default is enabled
8325  * @praram enabled
8326  */
8327 void gap_set_bondable_mode(int enable){
8328     hci_stack->bondable = enable ? 1 : 0;
8329 }
8330 /**
8331  * @brief Get bondable mode.
8332  * @return 1 if bondable
8333  */
8334 int gap_get_bondable_mode(void){
8335     return hci_stack->bondable;
8336 }
8337 
8338 /**
8339  * @brief map link keys to security levels
8340  */
8341 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){
8342     switch (link_key_type){
8343         case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256:
8344             return LEVEL_4;
8345         case COMBINATION_KEY:
8346         case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192:
8347             return LEVEL_3;
8348         default:
8349             return LEVEL_2;
8350     }
8351 }
8352 
8353 /**
8354  * @brief map link keys to secure connection yes/no
8355  */
8356 bool gap_secure_connection_for_link_key_type(link_key_type_t link_key_type){
8357     switch (link_key_type){
8358         case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256:
8359         case UNAUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256:
8360             return true;
8361         default:
8362             return false;
8363     }
8364 }
8365 
8366 /**
8367  * @brief map link keys to authenticated
8368  */
8369 bool gap_authenticated_for_link_key_type(link_key_type_t link_key_type){
8370     switch (link_key_type){
8371         case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256:
8372         case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192:
8373             return true;
8374         default:
8375             return false;
8376     }
8377 }
8378 
8379 bool gap_mitm_protection_required_for_security_level(gap_security_level_t level){
8380     log_info("gap_mitm_protection_required_for_security_level %u", level);
8381     return level > LEVEL_2;
8382 }
8383 
8384 /**
8385  * @brief get current security level
8386  */
8387 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){
8388     hci_connection_t * connection = hci_connection_for_handle(con_handle);
8389     if (!connection) return LEVEL_0;
8390     return gap_security_level_for_connection(connection);
8391 }
8392 
8393 /**
8394  * @brief request connection to device to
8395  * @result GAP_AUTHENTICATION_RESULT
8396  */
8397 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){
8398     hci_connection_t * connection = hci_connection_for_handle(con_handle);
8399     if (!connection){
8400         hci_emit_security_level(con_handle, LEVEL_0);
8401         return;
8402     }
8403 
8404     btstack_assert(hci_is_le_connection(connection) == false);
8405 
8406     // Core Spec 5.2, GAP 5.2.2: "When in Secure Connections Only mode, all services (except those allowed to have Security Mode 4, Level 0)
8407     // available on the BR/EDR physical transport require Security Mode 4, Level 4 "
8408     if (hci_stack->gap_secure_connections_only_mode && (requested_level != LEVEL_0)){
8409         requested_level = LEVEL_4;
8410     }
8411 
8412     gap_security_level_t current_level = gap_security_level(con_handle);
8413     log_info("gap_request_security_level requested level %u, planned level %u, current level %u",
8414         requested_level, connection->requested_security_level, current_level);
8415 
8416     // authentication active if authentication request was sent or planned level > 0
8417     bool authentication_active = ((connection->bonding_flags & BONDING_SENT_AUTHENTICATE_REQUEST) != 0) || (connection->requested_security_level > LEVEL_0);
8418     if (authentication_active){
8419         // authentication already active
8420         if (connection->requested_security_level < requested_level){
8421             // increase requested level as new level is higher
8422             // TODO: handle re-authentication when done
8423             connection->requested_security_level = requested_level;
8424         }
8425     } else {
8426         // no request active, notify if security sufficient
8427         if (requested_level <= current_level){
8428             hci_emit_security_level(con_handle, current_level);
8429             return;
8430         }
8431 
8432         // store request
8433         connection->requested_security_level = requested_level;
8434 
8435         // start to authenticate connection
8436         connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST;
8437 
8438         // request remote features if not already active, also trigger hci_run
8439         hci_remote_features_query(con_handle);
8440     }
8441 }
8442 
8443 /**
8444  * @brief start dedicated bonding with device. disconnect after bonding
8445  * @param device
8446  * @param request MITM protection
8447  * @result GAP_DEDICATED_BONDING_COMPLETE
8448  */
8449 int gap_dedicated_bonding(bd_addr_t device, int mitm_protection_required){
8450 
8451     // create connection state machine
8452     hci_connection_t * connection = create_connection_for_bd_addr_and_type(device, BD_ADDR_TYPE_ACL, HCI_ROLE_MASTER);
8453 
8454     if (!connection){
8455         return BTSTACK_MEMORY_ALLOC_FAILED;
8456     }
8457 
8458     // delete link key
8459     gap_drop_link_key_for_bd_addr(device);
8460 
8461     // configure LEVEL_2/3, dedicated bonding
8462     connection->state = SEND_CREATE_CONNECTION;
8463     connection->requested_security_level = mitm_protection_required ? LEVEL_3 : LEVEL_2;
8464     log_info("gap_dedicated_bonding, mitm %d -> level %u", mitm_protection_required, connection->requested_security_level);
8465     connection->bonding_flags = BONDING_DEDICATED;
8466 
8467     hci_run();
8468 
8469     return 0;
8470 }
8471 
8472 uint8_t hci_dedicated_bonding_defer_disconnect(hci_con_handle_t con_handle, bool defer){
8473     hci_connection_t * connection = hci_connection_for_handle(con_handle);
8474     if (connection == NULL){
8475         return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8476     }
8477     if (defer){
8478         connection->bonding_flags |= BONDING_DEDICATED_DEFER_DISCONNECT;
8479     } else {
8480         connection->bonding_flags &= ~BONDING_DEDICATED_DEFER_DISCONNECT;
8481         // trigger disconnect
8482         hci_run();
8483     }
8484     return ERROR_CODE_SUCCESS;
8485 }
8486 
8487 void gap_set_local_name(const char * local_name){
8488     hci_stack->local_name = local_name;
8489     hci_stack->gap_tasks_classic |= GAP_TASK_SET_LOCAL_NAME;
8490     // also update EIR if not set by user
8491     if (hci_stack->eir_data == NULL){
8492         hci_stack->gap_tasks_classic |= GAP_TASK_SET_EIR_DATA;
8493     }
8494     hci_run();
8495 }
8496 #endif
8497 
8498 
8499 #ifdef ENABLE_BLE
8500 
8501 #ifdef ENABLE_LE_CENTRAL
8502 void gap_start_scan(void){
8503     hci_stack->le_scanning_enabled = true;
8504     hci_run();
8505 }
8506 
8507 void gap_stop_scan(void){
8508     hci_stack->le_scanning_enabled = false;
8509     hci_run();
8510 }
8511 
8512 void gap_set_scan_params(uint8_t scan_type, uint16_t scan_interval, uint16_t scan_window, uint8_t scanning_filter_policy){
8513     hci_stack->le_scan_type          = scan_type;
8514     hci_stack->le_scan_filter_policy = scanning_filter_policy;
8515     hci_stack->le_scan_interval      = scan_interval;
8516     hci_stack->le_scan_window        = scan_window;
8517     hci_stack->le_scanning_param_update = true;
8518     hci_run();
8519 }
8520 
8521 void gap_set_scan_parameters(uint8_t scan_type, uint16_t scan_interval, uint16_t scan_window){
8522     gap_set_scan_params(scan_type, scan_interval, scan_window, 0);
8523 }
8524 
8525 void gap_set_scan_duplicate_filter(bool enabled){
8526     hci_stack->le_scan_filter_duplicates = enabled ? 1 : 0;
8527 }
8528 
8529 void gap_set_scan_phys(uint8_t phys){
8530     // LE Coded and LE 1M PHY
8531     hci_stack->le_scan_phys = phys & 0x05;
8532 }
8533 
8534 uint8_t gap_connect(const bd_addr_t addr, bd_addr_type_t addr_type) {
8535     // disallow le connection if outgoing already active
8536     if (hci_is_le_connection_type(addr_type) && hci_stack->le_connecting_request != LE_CONNECTING_IDLE){
8537         log_error("le connect already active");
8538         return ERROR_CODE_COMMAND_DISALLOWED;
8539     }
8540 
8541     hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, addr_type);
8542     if (conn == NULL) {
8543         conn = create_connection_for_bd_addr_and_type(addr, addr_type, HCI_ROLE_MASTER);
8544         if (conn == NULL){
8545             // alloc failed
8546             log_info("gap_connect: failed to alloc hci_connection_t");
8547             return BTSTACK_MEMORY_ALLOC_FAILED;
8548         }
8549     } else {
8550         switch (conn->state) {
8551             case RECEIVED_DISCONNECTION_COMPLETE:
8552                 // connection was just disconnected, reset state and allow re-connect
8553                 conn->role = HCI_ROLE_MASTER;
8554                 break;
8555             default:
8556                 return ERROR_CODE_COMMAND_DISALLOWED;
8557         }
8558     }
8559 
8560     // set le connecting state
8561     if (hci_is_le_connection_type(addr_type)){
8562         hci_stack->le_connecting_request = LE_CONNECTING_DIRECT;
8563     }
8564 
8565     // trigger connect
8566     log_info("gap_connect: send create connection next");
8567     conn->state = SEND_CREATE_CONNECTION;
8568     hci_run();
8569     return ERROR_CODE_SUCCESS;
8570 }
8571 
8572 // @assumption: only a single outgoing LE Connection exists
8573 static hci_connection_t * gap_get_outgoing_le_connection(void){
8574     btstack_linked_item_t *it;
8575     for (it = (btstack_linked_item_t *) hci_stack->connections; it != NULL; it = it->next){
8576         hci_connection_t * conn = (hci_connection_t *) it;
8577         if (hci_is_le_connection(conn)){
8578             switch (conn->state){
8579                 case SEND_CREATE_CONNECTION:
8580                 case SENT_CREATE_CONNECTION:
8581                     return conn;
8582                 default:
8583                     break;
8584             };
8585         }
8586     }
8587     return NULL;
8588 }
8589 
8590 uint8_t gap_connect_cancel(void){
8591     hci_connection_t * conn;
8592     switch (hci_stack->le_connecting_request){
8593         case LE_CONNECTING_IDLE:
8594             break;
8595         case LE_CONNECTING_WHITELIST:
8596             hci_stack->le_connecting_request = LE_CONNECTING_IDLE;
8597             hci_run();
8598             break;
8599         case LE_CONNECTING_DIRECT:
8600             hci_stack->le_connecting_request = LE_CONNECTING_IDLE;
8601             conn = gap_get_outgoing_le_connection();
8602             if (conn == NULL){
8603                 hci_run();
8604             } else {
8605                 switch (conn->state){
8606                     case SEND_CREATE_CONNECTION:
8607                         // skip sending create connection and emit event instead
8608                         hci_emit_le_connection_complete(conn->address_type, conn->address, 0, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER);
8609                         btstack_linked_list_remove(&hci_stack->connections, (btstack_linked_item_t *) conn);
8610                         btstack_memory_hci_connection_free( conn );
8611                         break;
8612                     case SENT_CREATE_CONNECTION:
8613                         // let hci_run_general_gap_le cancel outgoing connection
8614                         hci_run();
8615                         break;
8616                     default:
8617                         break;
8618                 }
8619             }
8620             break;
8621         default:
8622             btstack_unreachable();
8623             break;
8624     }
8625     return ERROR_CODE_SUCCESS;
8626 }
8627 
8628 /**
8629  * @brief Set connection parameters for outgoing connections
8630  * @param conn_scan_interval (unit: 0.625 msec), default: 60 ms
8631  * @param conn_scan_window (unit: 0.625 msec), default: 30 ms
8632  * @param conn_interval_min (unit: 1.25ms), default: 10 ms
8633  * @param conn_interval_max (unit: 1.25ms), default: 30 ms
8634  * @param conn_latency, default: 4
8635  * @param supervision_timeout (unit: 10ms), default: 720 ms
8636  * @param min_ce_length (unit: 0.625ms), default: 10 ms
8637  * @param max_ce_length (unit: 0.625ms), default: 30 ms
8638  */
8639 
8640 void gap_set_connection_phys(uint8_t phys){
8641     // LE Coded, LE 1M, LE 2M PHY
8642     hci_stack->le_connection_phys = phys & 7;
8643 }
8644 
8645 #endif
8646 
8647 void gap_set_connection_parameters(uint16_t conn_scan_interval, uint16_t conn_scan_window,
8648                                    uint16_t conn_interval_min, uint16_t conn_interval_max, uint16_t conn_latency,
8649                                    uint16_t supervision_timeout, uint16_t min_ce_length, uint16_t max_ce_length){
8650     hci_stack->le_connection_scan_interval = conn_scan_interval;
8651     hci_stack->le_connection_scan_window = conn_scan_window;
8652     hci_stack->le_connection_interval_min = conn_interval_min;
8653     hci_stack->le_connection_interval_max = conn_interval_max;
8654     hci_stack->le_connection_latency = conn_latency;
8655     hci_stack->le_supervision_timeout = supervision_timeout;
8656     hci_stack->le_minimum_ce_length = min_ce_length;
8657     hci_stack->le_maximum_ce_length = max_ce_length;
8658 }
8659 
8660 /**
8661  * @brief Updates the connection parameters for a given LE connection
8662  * @param handle
8663  * @param conn_interval_min (unit: 1.25ms)
8664  * @param conn_interval_max (unit: 1.25ms)
8665  * @param conn_latency
8666  * @param supervision_timeout (unit: 10ms)
8667  * @return 0 if ok
8668  */
8669 int gap_update_connection_parameters(hci_con_handle_t con_handle, uint16_t conn_interval_min,
8670     uint16_t conn_interval_max, uint16_t conn_latency, uint16_t supervision_timeout){
8671     hci_connection_t * connection = hci_connection_for_handle(con_handle);
8672     if (!connection) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8673     connection->le_conn_interval_min = conn_interval_min;
8674     connection->le_conn_interval_max = conn_interval_max;
8675     connection->le_conn_latency = conn_latency;
8676     connection->le_supervision_timeout = supervision_timeout;
8677     connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS;
8678     hci_run();
8679     return 0;
8680 }
8681 
8682 /**
8683  * @brief Request an update of the connection parameter for a given LE connection
8684  * @param handle
8685  * @param conn_interval_min (unit: 1.25ms)
8686  * @param conn_interval_max (unit: 1.25ms)
8687  * @param conn_latency
8688  * @param supervision_timeout (unit: 10ms)
8689  * @return 0 if ok
8690  */
8691 int gap_request_connection_parameter_update(hci_con_handle_t con_handle, uint16_t conn_interval_min,
8692     uint16_t conn_interval_max, uint16_t conn_latency, uint16_t supervision_timeout){
8693     hci_connection_t * connection = hci_connection_for_handle(con_handle);
8694     if (!connection) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8695     connection->le_conn_interval_min = conn_interval_min;
8696     connection->le_conn_interval_max = conn_interval_max;
8697     connection->le_conn_latency = conn_latency;
8698     connection->le_supervision_timeout = supervision_timeout;
8699     connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_REQUEST;
8700     uint8_t l2cap_trigger_run_event[2] = { L2CAP_EVENT_TRIGGER_RUN, 0};
8701     hci_emit_btstack_event(l2cap_trigger_run_event, sizeof(l2cap_trigger_run_event), 0);
8702     return 0;
8703 }
8704 
8705 #ifdef ENABLE_LE_PERIPHERAL
8706 
8707 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
8708 static void hci_assert_advertisement_set_0_ready(void){
8709     // force advertising set creation for legacy LE Advertising
8710     if ((hci_stack->le_advertisements_state & LE_ADVERTISEMENT_STATE_PARAMS_SET) == 0){
8711         hci_stack->le_advertisements_todo |= LE_ADVERTISEMENT_TASKS_SET_PARAMS;
8712     }
8713 }
8714 #endif
8715 
8716 /**
8717  * @brief Set Advertisement Data
8718  * @param advertising_data_length
8719  * @param advertising_data (max 31 octets)
8720  * @note data is not copied, pointer has to stay valid
8721  */
8722 void gap_advertisements_set_data(uint8_t advertising_data_length, uint8_t * advertising_data){
8723     hci_stack->le_advertisements_data_len = advertising_data_length;
8724     hci_stack->le_advertisements_data = advertising_data;
8725     hci_stack->le_advertisements_todo |= LE_ADVERTISEMENT_TASKS_SET_ADV_DATA;
8726 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
8727     hci_assert_advertisement_set_0_ready();
8728 #endif
8729     hci_run();
8730 }
8731 
8732 /**
8733  * @brief Set Scan Response Data
8734  * @param advertising_data_length
8735  * @param advertising_data (max 31 octets)
8736  * @note data is not copied, pointer has to stay valid
8737  */
8738 void gap_scan_response_set_data(uint8_t scan_response_data_length, uint8_t * scan_response_data){
8739     hci_stack->le_scan_response_data_len = scan_response_data_length;
8740     hci_stack->le_scan_response_data = scan_response_data;
8741     hci_stack->le_advertisements_todo |= LE_ADVERTISEMENT_TASKS_SET_SCAN_DATA;
8742 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
8743     hci_assert_advertisement_set_0_ready();
8744 #endif
8745     hci_run();
8746 }
8747 
8748 /**
8749  * @brief Set Advertisement Parameters
8750  * @param adv_int_min
8751  * @param adv_int_max
8752  * @param adv_type
8753  * @param direct_address_type
8754  * @param direct_address
8755  * @param channel_map
8756  * @param filter_policy
8757  *
8758  * @note internal use. use gap_advertisements_set_params from gap_le.h instead.
8759  */
8760  void hci_le_advertisements_set_params(uint16_t adv_int_min, uint16_t adv_int_max, uint8_t adv_type,
8761     uint8_t direct_address_typ, bd_addr_t direct_address,
8762     uint8_t channel_map, uint8_t filter_policy) {
8763 
8764     hci_stack->le_advertisements_interval_min = adv_int_min;
8765     hci_stack->le_advertisements_interval_max = adv_int_max;
8766     hci_stack->le_advertisements_type = adv_type;
8767     hci_stack->le_advertisements_direct_address_type = direct_address_typ;
8768     hci_stack->le_advertisements_channel_map = channel_map;
8769     hci_stack->le_advertisements_filter_policy = filter_policy;
8770     (void)memcpy(hci_stack->le_advertisements_direct_address, direct_address,
8771                  6);
8772 
8773     hci_stack->le_advertisements_todo  |= LE_ADVERTISEMENT_TASKS_SET_PARAMS;
8774     hci_stack->le_advertisements_state |= LE_ADVERTISEMENT_STATE_PARAMS_SET;
8775     hci_run();
8776  }
8777 
8778 /**
8779  * @brief Enable/Disable Advertisements
8780  * @param enabled
8781  */
8782 void gap_advertisements_enable(int enabled){
8783     if (enabled == 0){
8784         hci_stack->le_advertisements_state &= ~LE_ADVERTISEMENT_STATE_ENABLED;
8785     } else {
8786         hci_stack->le_advertisements_state |= LE_ADVERTISEMENT_STATE_ENABLED;
8787     }
8788     hci_update_advertisements_enabled_for_current_roles();
8789     hci_run();
8790 }
8791 
8792 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
8793 static le_advertising_set_t * hci_advertising_set_for_handle(uint8_t advertising_handle){
8794     btstack_linked_list_iterator_t it;
8795     btstack_linked_list_iterator_init(&it, &hci_stack->le_advertising_sets);
8796     while (btstack_linked_list_iterator_has_next(&it)){
8797         le_advertising_set_t * item = (le_advertising_set_t *) btstack_linked_list_iterator_next(&it);
8798         if ( item->advertising_handle == advertising_handle ) {
8799             return item;
8800         }
8801     }
8802     return NULL;
8803 }
8804 
8805 uint8_t gap_extended_advertising_set_resolvable_private_address_update(uint16_t update_s){
8806     hci_stack->le_resolvable_private_address_update_s = update_s;
8807     hci_run();
8808     return ERROR_CODE_SUCCESS;
8809 }
8810 
8811 uint8_t gap_extended_advertising_setup(le_advertising_set_t * storage, const le_extended_advertising_parameters_t * advertising_parameters, uint8_t * out_advertising_handle){
8812     // find free advertisement handle
8813     uint8_t advertisement_handle;
8814     for (advertisement_handle = 1; advertisement_handle <= LE_EXTENDED_ADVERTISING_MAX_HANDLE; advertisement_handle++){
8815         if (hci_advertising_set_for_handle(advertisement_handle) == NULL) break;
8816     }
8817     if (advertisement_handle > LE_EXTENDED_ADVERTISING_MAX_HANDLE) return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED;
8818     // clear
8819     memset(storage, 0, sizeof(le_advertising_set_t));
8820     // copy params
8821     storage->advertising_handle = advertisement_handle;
8822     memcpy(&storage->extended_params, advertising_parameters, sizeof(le_extended_advertising_parameters_t));
8823     // add to list
8824     bool add_ok = btstack_linked_list_add(&hci_stack->le_advertising_sets, (btstack_linked_item_t *) storage);
8825     if (!add_ok) return ERROR_CODE_ACL_CONNECTION_ALREADY_EXISTS;
8826     *out_advertising_handle = advertisement_handle;
8827     // set tasks and start
8828     storage->tasks = LE_ADVERTISEMENT_TASKS_SET_PARAMS;
8829     hci_run();
8830     return ERROR_CODE_SUCCESS;
8831 }
8832 
8833 uint8_t gap_extended_advertising_set_params(uint8_t advertising_handle, const le_extended_advertising_parameters_t * advertising_parameters){
8834     le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(advertising_handle);
8835     if (advertising_set == NULL) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8836     memcpy(&advertising_set->extended_params, advertising_parameters, sizeof(le_extended_advertising_parameters_t));
8837     // set tasks and start
8838     advertising_set->tasks |= LE_ADVERTISEMENT_TASKS_SET_PARAMS;
8839     hci_run();
8840     return ERROR_CODE_SUCCESS;
8841 }
8842 
8843 uint8_t gap_extended_advertising_get_params(uint8_t advertising_handle, le_extended_advertising_parameters_t * advertising_parameters){
8844     le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(advertising_handle);
8845     if (advertising_set == NULL) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8846     memcpy(advertising_parameters, &advertising_set->extended_params, sizeof(le_extended_advertising_parameters_t));
8847     return ERROR_CODE_SUCCESS;
8848 }
8849 
8850 uint8_t gap_extended_advertising_set_random_address(uint8_t advertising_handle, bd_addr_t random_address){
8851     le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(advertising_handle);
8852     if (advertising_set == NULL) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8853     memcpy(advertising_set->random_address, random_address, 6);
8854     // set tasks and start
8855     advertising_set->tasks |= LE_ADVERTISEMENT_TASKS_SET_ADDRESS;
8856     hci_run();
8857     return ERROR_CODE_SUCCESS;
8858 }
8859 
8860 uint8_t gap_extended_advertising_set_adv_data(uint8_t advertising_handle, uint16_t advertising_data_length, const uint8_t * advertising_data){
8861     le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(advertising_handle);
8862     if (advertising_set == NULL) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8863     advertising_set->adv_data = advertising_data;
8864     advertising_set->adv_data_len = advertising_data_length;
8865     // set tasks and start
8866     advertising_set->tasks |= LE_ADVERTISEMENT_TASKS_SET_ADV_DATA;
8867     hci_run();
8868     return ERROR_CODE_SUCCESS;
8869 }
8870 
8871 uint8_t gap_extended_advertising_set_scan_response_data(uint8_t advertising_handle, uint16_t scan_response_data_length, const uint8_t * scan_response_data){
8872     le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(advertising_handle);
8873     if (advertising_set == NULL) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8874     advertising_set->scan_data = scan_response_data;
8875     advertising_set->scan_data_len = scan_response_data_length;
8876     // set tasks and start
8877     advertising_set->tasks |= LE_ADVERTISEMENT_TASKS_SET_SCAN_DATA;
8878     hci_run();
8879     return ERROR_CODE_SUCCESS;
8880 }
8881 
8882 uint8_t gap_extended_advertising_start(uint8_t advertising_handle, uint16_t timeout, uint8_t num_extended_advertising_events){
8883     le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(advertising_handle);
8884     if (advertising_set == NULL) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8885     advertising_set->enable_timeout = timeout;
8886     advertising_set->enable_max_scan_events = num_extended_advertising_events;
8887     // set tasks and start
8888     advertising_set->state |= LE_ADVERTISEMENT_STATE_ENABLED;
8889     hci_run();
8890     return ERROR_CODE_SUCCESS;
8891 }
8892 
8893 uint8_t gap_extended_advertising_stop(uint8_t advertising_handle){
8894     le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(advertising_handle);
8895     if (advertising_set == NULL) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8896     // set tasks and start
8897     advertising_set->state &= ~LE_ADVERTISEMENT_STATE_ENABLED;
8898     hci_run();
8899     return ERROR_CODE_SUCCESS;
8900 }
8901 
8902 uint8_t gap_extended_advertising_remove(uint8_t advertising_handle){
8903     le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(advertising_handle);
8904     if (advertising_set == NULL) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8905     // set tasks and start
8906     advertising_set->tasks |= LE_ADVERTISEMENT_TASKS_REMOVE_SET;
8907     hci_run();
8908     return ERROR_CODE_SUCCESS;
8909 }
8910 
8911 #ifdef ENABLE_LE_PERIODIC_ADVERTISING
8912 uint8_t gap_periodic_advertising_set_params(uint8_t advertising_handle, const le_periodic_advertising_parameters_t * advertising_parameters){
8913     le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(advertising_handle);
8914     if (advertising_set == NULL) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8915     // periodic advertising requires neither connectable, scannable, legacy or anonymous
8916     if ((advertising_set->extended_params.advertising_event_properties & 0x1f) != 0) return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS;
8917     memcpy(&advertising_set->periodic_params, advertising_parameters, sizeof(le_periodic_advertising_parameters_t));
8918     // set tasks and start
8919     advertising_set->tasks |= LE_ADVERTISEMENT_TASKS_SET_PERIODIC_PARAMS;
8920     hci_run();
8921     return ERROR_CODE_SUCCESS;
8922 }
8923 
8924 uint8_t gap_periodic_advertising_get_params(uint8_t advertising_handle, le_periodic_advertising_parameters_t * advertising_parameters){
8925     le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(advertising_handle);
8926     if (advertising_set == NULL) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8927     memcpy(advertising_parameters, &advertising_set->extended_params, sizeof(le_periodic_advertising_parameters_t));
8928     return ERROR_CODE_SUCCESS;
8929 }
8930 
8931 uint8_t gap_periodic_advertising_set_data(uint8_t advertising_handle, uint16_t periodic_data_length, const uint8_t * periodic_data){
8932     le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(advertising_handle);
8933     if (advertising_set == NULL) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8934     advertising_set->periodic_data = periodic_data;
8935     advertising_set->periodic_data_len = periodic_data_length;
8936     // set tasks and start
8937     advertising_set->tasks |= LE_ADVERTISEMENT_TASKS_SET_PERIODIC_DATA;
8938     hci_run();
8939     return ERROR_CODE_SUCCESS;
8940 }
8941 
8942 uint8_t gap_periodic_advertising_start(uint8_t advertising_handle, bool include_adi){
8943     le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(advertising_handle);
8944     if (advertising_set == NULL) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8945     // set tasks and start
8946     advertising_set->periodic_include_adi = include_adi;
8947     advertising_set->state |= LE_ADVERTISEMENT_STATE_PERIODIC_ENABLED;
8948     hci_run();
8949     return ERROR_CODE_SUCCESS;
8950 }
8951 
8952 uint8_t gap_periodic_advertising_stop(uint8_t advertising_handle){
8953     le_advertising_set_t * advertising_set = hci_advertising_set_for_handle(advertising_handle);
8954     if (advertising_set == NULL) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8955     // set tasks and start
8956     advertising_set->state &= ~LE_ADVERTISEMENT_STATE_PERIODIC_ENABLED;
8957     hci_run();
8958     return ERROR_CODE_SUCCESS;
8959 }
8960 
8961 #ifdef ENABLE_LE_CENTRAL
8962 uint8_t gap_periodic_advertising_sync_transfer_set_default_parameters(uint8_t mode, uint16_t skip, uint16_t sync_timeout, uint8_t cte_type){
8963     hci_stack->le_past_mode = mode;
8964     hci_stack->le_past_skip = skip;
8965     hci_stack->le_past_sync_timeout = sync_timeout;
8966     hci_stack->le_past_cte_type = cte_type;
8967     hci_stack->le_past_set_default_params = true;
8968     hci_run();
8969     return ERROR_CODE_SUCCESS;
8970 }
8971 
8972 uint8_t gap_periodic_advertising_sync_transfer_send(hci_con_handle_t con_handle, uint16_t service_data, hci_con_handle_t sync_handle){
8973     hci_connection_t * hci_connection = hci_connection_for_handle(con_handle);
8974     if (hci_connection == NULL){
8975         return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8976     }
8977     hci_connection->le_past_sync_handle = sync_handle;
8978     hci_connection->le_past_service_data = service_data;
8979     hci_run();
8980     return ERROR_CODE_SUCCESS;
8981 }
8982 #endif
8983 
8984 uint8_t gap_periodic_advertising_set_info_transfer_send(hci_con_handle_t con_handle, uint16_t service_data, uint8_t advertising_handle){
8985     hci_connection_t * hci_connection = hci_connection_for_handle(con_handle);
8986     if (hci_connection == NULL){
8987         return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
8988     }
8989     hci_connection->le_past_advertising_handle = advertising_handle;
8990     hci_connection->le_past_service_data = service_data;
8991     hci_run();
8992     return ERROR_CODE_SUCCESS;
8993 }
8994 
8995 #endif /* ENABLE_LE_PERIODIC_ADVERTISING */
8996 
8997 #endif
8998 
8999 #endif
9000 
9001 void hci_le_set_own_address_type(uint8_t own_address_type){
9002     log_info("hci_le_set_own_address_type: old %u, new %u", hci_stack->le_own_addr_type, own_address_type);
9003     if (own_address_type == hci_stack->le_own_addr_type) return;
9004     hci_stack->le_own_addr_type = own_address_type;
9005 
9006 #ifdef ENABLE_LE_PERIPHERAL
9007     // update advertisement parameters, too
9008     hci_stack->le_advertisements_todo |= LE_ADVERTISEMENT_TASKS_SET_PARAMS;
9009     hci_run();
9010 #endif
9011 #ifdef ENABLE_LE_CENTRAL
9012     // note: we don't update scan parameters or modify ongoing connection attempts
9013 #endif
9014 }
9015 
9016 void hci_le_random_address_set(const bd_addr_t random_address){
9017     log_info("gap_privacy: hci_le_random_address_set %s", bd_addr_to_str(random_address));
9018     memcpy(hci_stack->le_random_address, random_address, 6);
9019     hci_stack->le_random_address_set = true;
9020     hci_stack->le_advertisements_todo |= LE_ADVERTISEMENT_TASKS_SET_ADDRESS | LE_ADVERTISEMENT_TASKS_PRIVACY_NOTIFY;
9021 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
9022     if (hci_le_extended_advertising_supported()){
9023         hci_assert_advertisement_set_0_ready();
9024         hci_stack->le_advertisements_todo |= LE_ADVERTISEMENT_TASKS_SET_ADDRESS_SET_0;
9025     }
9026 #endif
9027     hci_run();
9028 }
9029 
9030 #endif
9031 
9032 uint8_t gap_disconnect(hci_con_handle_t handle){
9033     hci_connection_t * conn = hci_connection_for_handle(handle);
9034     if (!conn){
9035         hci_emit_disconnection_complete(handle, 0);
9036         return 0;
9037     }
9038     uint8_t status = ERROR_CODE_SUCCESS;
9039     switch (conn->state){
9040         case RECEIVED_DISCONNECTION_COMPLETE:
9041             // ignore if remote just disconnected
9042             break;
9043         case SEND_DISCONNECT:
9044         case SENT_DISCONNECT:
9045             // disconnect already requested or sent
9046             status = ERROR_CODE_COMMAND_DISALLOWED;
9047             break;
9048         default:
9049             // trigger hci_disconnect
9050             conn->state = SEND_DISCONNECT;
9051             hci_run();
9052             break;
9053     }
9054     return status;
9055 }
9056 
9057 int gap_read_rssi(hci_con_handle_t con_handle){
9058     hci_connection_t * hci_connection = hci_connection_for_handle(con_handle);
9059     if (hci_connection == NULL) return 0;
9060     hci_connection->gap_connection_tasks |= GAP_CONNECTION_TASK_READ_RSSI;
9061     hci_run();
9062     return 1;
9063 }
9064 
9065 /**
9066  * @brief Get connection type
9067  * @param con_handle
9068  * @result connection_type
9069  */
9070 gap_connection_type_t gap_get_connection_type(hci_con_handle_t connection_handle){
9071     hci_connection_t * conn = hci_connection_for_handle(connection_handle);
9072     if (!conn) return GAP_CONNECTION_INVALID;
9073     switch (conn->address_type){
9074         case BD_ADDR_TYPE_LE_PUBLIC:
9075         case BD_ADDR_TYPE_LE_RANDOM:
9076         case BD_ADDR_TYPE_LE_PUBLIC_IDENTITY:
9077         case BD_ADDR_TYPE_LE_RANDOM_IDENTITY:
9078             return GAP_CONNECTION_LE;
9079         case BD_ADDR_TYPE_SCO:
9080             return GAP_CONNECTION_SCO;
9081         case BD_ADDR_TYPE_ACL:
9082             return GAP_CONNECTION_ACL;
9083         default:
9084             return GAP_CONNECTION_INVALID;
9085     }
9086 }
9087 
9088 hci_role_t gap_get_role(hci_con_handle_t connection_handle){
9089     hci_connection_t * conn = hci_connection_for_handle(connection_handle);
9090     if (!conn) return HCI_ROLE_INVALID;
9091     return (hci_role_t) conn->role;
9092 }
9093 
9094 
9095 #ifdef ENABLE_CLASSIC
9096 uint8_t gap_request_role(const bd_addr_t addr, hci_role_t role){
9097     hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL);
9098     if (!conn) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
9099     conn->request_role = role;
9100     hci_run();
9101     return ERROR_CODE_SUCCESS;
9102 }
9103 #endif
9104 
9105 #ifdef ENABLE_BLE
9106 
9107 uint8_t gap_le_set_phy(hci_con_handle_t con_handle, uint8_t all_phys, uint8_t tx_phys, uint8_t rx_phys, uint16_t phy_options){
9108     hci_connection_t * conn = hci_connection_for_handle(con_handle);
9109     if (!conn) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
9110 
9111     conn->le_phy_update_all_phys    = all_phys;
9112     conn->le_phy_update_tx_phys     = tx_phys;
9113     conn->le_phy_update_rx_phys     = rx_phys;
9114     conn->le_phy_update_phy_options = (uint8_t) phy_options;
9115 
9116     hci_run();
9117 
9118     return 0;
9119 }
9120 
9121 static uint8_t hci_whitelist_add(bd_addr_type_t address_type, const bd_addr_t address){
9122 
9123 #if !defined(HAVE_MALLOC) && (!defined(MAX_NR_WHITELIST_ENTRIES) || (MAX_NR_WHITELIST_ENTRIES == 0))
9124     // incorrect configuration:
9125     // - as MAX_NR_WHITELIST_ENTRIES is not defined or zero this function always fails
9126     // - please set MAX_NR_WHITELIST_ENTRIES in btstack_config.h
9127     btstack_assert(false);
9128 #endif
9129 
9130     // check if already in list
9131     btstack_linked_list_iterator_t it;
9132     btstack_linked_list_iterator_init(&it, &hci_stack->le_whitelist);
9133     while (btstack_linked_list_iterator_has_next(&it)) {
9134         whitelist_entry_t *entry = (whitelist_entry_t *) btstack_linked_list_iterator_next(&it);
9135         if (entry->address_type != address_type) {
9136             continue;
9137         }
9138         if (memcmp(entry->address, address, 6) != 0) {
9139             continue;
9140         }
9141 
9142         // if already on controller:
9143         if ((entry->state & LE_WHITELIST_ON_CONTROLLER) != 0){
9144             if ((entry->state & LE_WHITELIST_REMOVE_FROM_CONTROLLER) != 0){
9145                 // drop remove request
9146                 entry->state = LE_WHITELIST_ON_CONTROLLER;
9147                 return ERROR_CODE_SUCCESS;
9148             } else {
9149                 // disallow as already on controller
9150                 return ERROR_CODE_COMMAND_DISALLOWED;
9151             }
9152         }
9153 
9154         // assume scheduled to add
9155 		return ERROR_CODE_COMMAND_DISALLOWED;
9156     }
9157 
9158     // alloc and add to list
9159     whitelist_entry_t * entry = btstack_memory_whitelist_entry_get();
9160     if (!entry) return BTSTACK_MEMORY_ALLOC_FAILED;
9161     entry->address_type = address_type;
9162     (void)memcpy(entry->address, address, 6);
9163     entry->state = LE_WHITELIST_ADD_TO_CONTROLLER;
9164     btstack_linked_list_add(&hci_stack->le_whitelist, (btstack_linked_item_t*) entry);
9165     return ERROR_CODE_SUCCESS;
9166 }
9167 
9168 static uint8_t hci_whitelist_remove(bd_addr_type_t address_type, const bd_addr_t address){
9169     btstack_linked_list_iterator_t it;
9170     btstack_linked_list_iterator_init(&it, &hci_stack->le_whitelist);
9171     while (btstack_linked_list_iterator_has_next(&it)){
9172         whitelist_entry_t * entry = (whitelist_entry_t*) btstack_linked_list_iterator_next(&it);
9173         if (entry->address_type != address_type) {
9174             continue;
9175         }
9176         if (memcmp(entry->address, address, 6) != 0) {
9177             continue;
9178         }
9179         if (entry->state & LE_WHITELIST_ON_CONTROLLER){
9180             // remove from controller if already present
9181             entry->state |= LE_WHITELIST_REMOVE_FROM_CONTROLLER;
9182         }  else {
9183             // directly remove entry from whitelist
9184             btstack_linked_list_iterator_remove(&it);
9185             btstack_memory_whitelist_entry_free(entry);
9186         }
9187         return ERROR_CODE_SUCCESS;
9188     }
9189     return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
9190 }
9191 
9192 static void hci_whitelist_clear(void){
9193     btstack_linked_list_iterator_t it;
9194     btstack_linked_list_iterator_init(&it, &hci_stack->le_whitelist);
9195     while (btstack_linked_list_iterator_has_next(&it)){
9196         whitelist_entry_t * entry = (whitelist_entry_t*) btstack_linked_list_iterator_next(&it);
9197         if (entry->state & LE_WHITELIST_ON_CONTROLLER){
9198             // remove from controller if already present
9199             entry->state |= LE_WHITELIST_REMOVE_FROM_CONTROLLER;
9200             continue;
9201         }
9202         // directly remove entry from whitelist
9203         btstack_linked_list_iterator_remove(&it);
9204         btstack_memory_whitelist_entry_free(entry);
9205     }
9206 }
9207 
9208 /**
9209  * @brief Clear Whitelist
9210  * @return 0 if ok
9211  */
9212 uint8_t gap_whitelist_clear(void){
9213     hci_whitelist_clear();
9214     hci_run();
9215     return ERROR_CODE_SUCCESS;
9216 }
9217 
9218 /**
9219  * @brief Add Device to Whitelist
9220  * @param address_typ
9221  * @param address
9222  * @return 0 if ok
9223  */
9224 uint8_t gap_whitelist_add(bd_addr_type_t address_type, const bd_addr_t address){
9225     uint8_t status = hci_whitelist_add(address_type, address);
9226     if (status){
9227         return status;
9228     }
9229     hci_run();
9230     return ERROR_CODE_SUCCESS;
9231 }
9232 
9233 /**
9234  * @brief Remove Device from Whitelist
9235  * @param address_typ
9236  * @param address
9237  * @return 0 if ok
9238  */
9239 uint8_t gap_whitelist_remove(bd_addr_type_t address_type, const bd_addr_t address){
9240     uint8_t status = hci_whitelist_remove(address_type, address);
9241     if (status){
9242         return status;
9243     }
9244     hci_run();
9245     return ERROR_CODE_SUCCESS;
9246 }
9247 
9248 #ifdef ENABLE_LE_CENTRAL
9249 /**
9250  * @brief Connect with Whitelist
9251  * @note Explicit whitelist management and this connect with whitelist replace deprecated gap_auto_connection_* functions
9252  * @return - if ok
9253  */
9254 uint8_t gap_connect_with_whitelist(void){
9255     if (hci_stack->le_connecting_request != LE_CONNECTING_IDLE){
9256         return ERROR_CODE_COMMAND_DISALLOWED;
9257     }
9258     hci_stack->le_connecting_request = LE_CONNECTING_WHITELIST;
9259     hci_run();
9260     return ERROR_CODE_SUCCESS;
9261 }
9262 
9263 /**
9264  * @brief Auto Connection Establishment - Start Connecting to device
9265  * @param address_typ
9266  * @param address
9267  * @return 0 if ok
9268  */
9269 uint8_t gap_auto_connection_start(bd_addr_type_t address_type, const bd_addr_t address){
9270     if (hci_stack->le_connecting_request == LE_CONNECTING_DIRECT){
9271         return ERROR_CODE_COMMAND_DISALLOWED;
9272     }
9273 
9274     uint8_t status = hci_whitelist_add(address_type, address);
9275     if (status == BTSTACK_MEMORY_ALLOC_FAILED) {
9276         return status;
9277     }
9278 
9279     hci_stack->le_connecting_request = LE_CONNECTING_WHITELIST;
9280 
9281     hci_run();
9282     return ERROR_CODE_SUCCESS;
9283 }
9284 
9285 /**
9286  * @brief Auto Connection Establishment - Stop Connecting to device
9287  * @param address_typ
9288  * @param address
9289  * @return 0 if ok
9290  */
9291 uint8_t gap_auto_connection_stop(bd_addr_type_t address_type, const bd_addr_t address){
9292     if (hci_stack->le_connecting_request == LE_CONNECTING_DIRECT){
9293         return ERROR_CODE_COMMAND_DISALLOWED;
9294     }
9295 
9296     hci_whitelist_remove(address_type, address);
9297     if (btstack_linked_list_empty(&hci_stack->le_whitelist)){
9298         hci_stack->le_connecting_request = LE_CONNECTING_IDLE;
9299     }
9300     hci_run();
9301     return 0;
9302 }
9303 
9304 /**
9305  * @brief Auto Connection Establishment - Stop everything
9306  * @note  Convenience function to stop all active auto connection attempts
9307  */
9308 uint8_t gap_auto_connection_stop_all(void){
9309     if (hci_stack->le_connecting_request == LE_CONNECTING_DIRECT) {
9310         return ERROR_CODE_COMMAND_DISALLOWED;
9311     }
9312     hci_whitelist_clear();
9313     hci_stack->le_connecting_request = LE_CONNECTING_IDLE;
9314     hci_run();
9315     return ERROR_CODE_SUCCESS;
9316 }
9317 
9318 uint16_t gap_le_connection_interval(hci_con_handle_t con_handle){
9319     hci_connection_t * conn = hci_connection_for_handle(con_handle);
9320     if (!conn) return 0;
9321     return conn->le_connection_interval;
9322 }
9323 #endif
9324 #endif
9325 
9326 #ifdef ENABLE_CLASSIC
9327 /**
9328  * @brief Set Extended Inquiry Response data
9329  * @param eir_data size HCI_EXTENDED_INQUIRY_RESPONSE_DATA_LEN (240) bytes, is not copied make sure memory is accessible during stack startup
9330  * @note has to be done before stack starts up
9331  */
9332 void gap_set_extended_inquiry_response(const uint8_t * data){
9333     hci_stack->eir_data = data;
9334     hci_stack->gap_tasks_classic |= GAP_TASK_SET_EIR_DATA;
9335     hci_run();
9336 }
9337 
9338 /**
9339  * @brief Start GAP Classic Inquiry
9340  * @param duration in 1.28s units
9341  * @return 0 if ok
9342  * @events: GAP_EVENT_INQUIRY_RESULT, GAP_EVENT_INQUIRY_COMPLETE
9343  */
9344 int gap_inquiry_start(uint8_t duration_in_1280ms_units){
9345     if (hci_stack->state != HCI_STATE_WORKING) return ERROR_CODE_COMMAND_DISALLOWED;
9346     if (hci_stack->inquiry_state != GAP_INQUIRY_STATE_IDLE) return ERROR_CODE_COMMAND_DISALLOWED;
9347     if ((duration_in_1280ms_units < GAP_INQUIRY_DURATION_MIN) || (duration_in_1280ms_units > GAP_INQUIRY_DURATION_MAX)){
9348         return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS;
9349     }
9350     hci_stack->inquiry_state = duration_in_1280ms_units;
9351     hci_stack->inquiry_max_period_length = 0;
9352     hci_stack->inquiry_min_period_length = 0;
9353     hci_run();
9354     return 0;
9355 }
9356 
9357 uint8_t gap_inquiry_periodic_start(uint8_t duration, uint16_t max_period_length, uint16_t min_period_length){
9358     if (hci_stack->state != HCI_STATE_WORKING)                return ERROR_CODE_COMMAND_DISALLOWED;
9359     if (hci_stack->inquiry_state != GAP_INQUIRY_STATE_IDLE)   return ERROR_CODE_COMMAND_DISALLOWED;
9360     if (duration < GAP_INQUIRY_DURATION_MIN)                  return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS;
9361     if (duration > GAP_INQUIRY_DURATION_MAX)                  return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS;
9362     if (max_period_length < GAP_INQUIRY_MAX_PERIODIC_LEN_MIN) return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS;;
9363     if (min_period_length < GAP_INQUIRY_MIN_PERIODIC_LEN_MIN) return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS;;
9364 
9365     hci_stack->inquiry_state = duration;
9366     hci_stack->inquiry_max_period_length = max_period_length;
9367     hci_stack->inquiry_min_period_length = min_period_length;
9368     hci_run();
9369     return 0;
9370 }
9371 
9372 /**
9373  * @brief Stop GAP Classic Inquiry
9374  * @return 0 if ok
9375  */
9376 int gap_inquiry_stop(void){
9377     if ((hci_stack->inquiry_state >= GAP_INQUIRY_DURATION_MIN) && (hci_stack->inquiry_state <= GAP_INQUIRY_DURATION_MAX)) {
9378         // emit inquiry complete event, before it even started
9379         uint8_t event[] = { GAP_EVENT_INQUIRY_COMPLETE, 1, 0};
9380         hci_emit_btstack_event(event, sizeof(event), 1);
9381         return 0;
9382     }
9383     switch (hci_stack->inquiry_state){
9384         case GAP_INQUIRY_STATE_ACTIVE:
9385             hci_stack->inquiry_state = GAP_INQUIRY_STATE_W2_CANCEL;
9386             hci_run();
9387             return ERROR_CODE_SUCCESS;
9388         case GAP_INQUIRY_STATE_PERIODIC:
9389             hci_stack->inquiry_state = GAP_INQUIRY_STATE_W2_EXIT_PERIODIC;
9390             hci_run();
9391             return ERROR_CODE_SUCCESS;
9392         default:
9393             return ERROR_CODE_COMMAND_DISALLOWED;
9394     }
9395 }
9396 
9397 void gap_inquiry_set_lap(uint32_t lap){
9398     hci_stack->inquiry_lap = lap;
9399 }
9400 
9401 void gap_inquiry_set_scan_activity(uint16_t inquiry_scan_interval, uint16_t inquiry_scan_window){
9402     hci_stack->inquiry_scan_interval = inquiry_scan_interval;
9403     hci_stack->inquiry_scan_window   = inquiry_scan_window;
9404     hci_stack->gap_tasks_classic |= GAP_TASK_WRITE_INQUIRY_SCAN_ACTIVITY;
9405     hci_run();
9406 }
9407 
9408 void gap_inquiry_set_transmit_power_level(int8_t tx_power)
9409 {
9410     hci_stack->inquiry_tx_power_level = tx_power;
9411     hci_stack->gap_tasks_classic |= GAP_TASK_WRITE_INQUIRY_TX_POWER_LEVEL;
9412     hci_run();
9413 }
9414 
9415 
9416 /**
9417  * @brief Remote Name Request
9418  * @param addr
9419  * @param page_scan_repetition_mode
9420  * @param clock_offset only used when bit 15 is set
9421  * @events: HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE
9422  */
9423 int gap_remote_name_request(const bd_addr_t addr, uint8_t page_scan_repetition_mode, uint16_t clock_offset){
9424     if (hci_stack->remote_name_state != GAP_REMOTE_NAME_STATE_IDLE) return ERROR_CODE_COMMAND_DISALLOWED;
9425     (void)memcpy(hci_stack->remote_name_addr, addr, 6);
9426     hci_stack->remote_name_page_scan_repetition_mode = page_scan_repetition_mode;
9427     hci_stack->remote_name_clock_offset = clock_offset;
9428     hci_stack->remote_name_state = GAP_REMOTE_NAME_STATE_W2_SEND;
9429     hci_run();
9430     return 0;
9431 }
9432 
9433 static int gap_pairing_set_state_and_run(const bd_addr_t addr, uint8_t state){
9434     hci_stack->gap_pairing_state = state;
9435     (void)memcpy(hci_stack->gap_pairing_addr, addr, 6);
9436     hci_run();
9437     return 0;
9438 }
9439 
9440 /**
9441  * @brief Legacy Pairing Pin Code Response for binary data / non-strings
9442  * @param addr
9443  * @param pin_data
9444  * @param pin_len
9445  * @return 0 if ok
9446  */
9447 int gap_pin_code_response_binary(const bd_addr_t addr, const uint8_t * pin_data, uint8_t pin_len){
9448     if (hci_stack->gap_pairing_state != GAP_PAIRING_STATE_IDLE) return ERROR_CODE_COMMAND_DISALLOWED;
9449     if (pin_len > PIN_CODE_LEN) return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS;
9450     hci_stack->gap_pairing_input.gap_pairing_pin = pin_data;
9451     hci_stack->gap_pairing_pin_len = pin_len;
9452     return gap_pairing_set_state_and_run(addr, GAP_PAIRING_STATE_SEND_PIN);
9453 }
9454 
9455 /**
9456  * @brief Legacy Pairing Pin Code Response
9457  * @param addr
9458  * @param pin
9459  * @return 0 if ok
9460  */
9461 int gap_pin_code_response(const bd_addr_t addr, const char * pin){
9462     return gap_pin_code_response_binary(addr, (const uint8_t*) pin, (uint8_t) strlen(pin));
9463 }
9464 
9465 /**
9466  * @brief Abort Legacy Pairing
9467  * @param addr
9468  * @param pin
9469  * @return 0 if ok
9470  */
9471 int gap_pin_code_negative(bd_addr_t addr){
9472     if (hci_stack->gap_pairing_state != GAP_PAIRING_STATE_IDLE) return ERROR_CODE_COMMAND_DISALLOWED;
9473     return gap_pairing_set_state_and_run(addr, GAP_PAIRING_STATE_SEND_PIN_NEGATIVE);
9474 }
9475 
9476 /**
9477  * @brief SSP Passkey Response
9478  * @param addr
9479  * @param passkey
9480  * @return 0 if ok
9481  */
9482 int gap_ssp_passkey_response(const bd_addr_t addr, uint32_t passkey){
9483     if (hci_stack->gap_pairing_state != GAP_PAIRING_STATE_IDLE) return ERROR_CODE_COMMAND_DISALLOWED;
9484     hci_stack->gap_pairing_input.gap_pairing_passkey = passkey;
9485     return gap_pairing_set_state_and_run(addr, GAP_PAIRING_STATE_SEND_PASSKEY);
9486 }
9487 
9488 /**
9489  * @brief Abort SSP Passkey Entry/Pairing
9490  * @param addr
9491  * @param pin
9492  * @return 0 if ok
9493  */
9494 int gap_ssp_passkey_negative(const bd_addr_t addr){
9495     if (hci_stack->gap_pairing_state != GAP_PAIRING_STATE_IDLE) return ERROR_CODE_COMMAND_DISALLOWED;
9496     return gap_pairing_set_state_and_run(addr, GAP_PAIRING_STATE_SEND_PASSKEY_NEGATIVE);
9497 }
9498 
9499 /**
9500  * @brief Accept SSP Numeric Comparison
9501  * @param addr
9502  * @param passkey
9503  * @return 0 if ok
9504  */
9505 int gap_ssp_confirmation_response(const bd_addr_t addr){
9506     if (hci_stack->gap_pairing_state != GAP_PAIRING_STATE_IDLE) return ERROR_CODE_COMMAND_DISALLOWED;
9507     return gap_pairing_set_state_and_run(addr, GAP_PAIRING_STATE_SEND_CONFIRMATION);
9508 }
9509 
9510 /**
9511  * @brief Abort SSP Numeric Comparison/Pairing
9512  * @param addr
9513  * @param pin
9514  * @return 0 if ok
9515  */
9516 int gap_ssp_confirmation_negative(const bd_addr_t addr){
9517     if (hci_stack->gap_pairing_state != GAP_PAIRING_STATE_IDLE) return ERROR_CODE_COMMAND_DISALLOWED;
9518     return gap_pairing_set_state_and_run(addr, GAP_PAIRING_STATE_SEND_CONFIRMATION_NEGATIVE);
9519 }
9520 
9521 #if defined(ENABLE_EXPLICIT_IO_CAPABILITIES_REPLY) || defined(ENABLE_EXPLICIT_LINK_KEY_REPLY)
9522 static uint8_t gap_set_auth_flag_and_run(const bd_addr_t addr, hci_authentication_flags_t flag){
9523     hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL);
9524     if (!conn) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
9525     connectionSetAuthenticationFlags(conn, flag);
9526     hci_run();
9527     return ERROR_CODE_SUCCESS;
9528 }
9529 #endif
9530 
9531 #ifdef ENABLE_EXPLICIT_IO_CAPABILITIES_REPLY
9532 uint8_t gap_ssp_io_capabilities_response(const bd_addr_t addr){
9533     return gap_set_auth_flag_and_run(addr, AUTH_FLAG_SEND_IO_CAPABILITIES_REPLY);
9534 }
9535 
9536 uint8_t gap_ssp_io_capabilities_negative(const bd_addr_t addr){
9537     return gap_set_auth_flag_and_run(addr, AUTH_FLAG_SEND_IO_CAPABILITIES_NEGATIVE_REPLY);
9538 }
9539 #endif
9540 
9541 #ifdef ENABLE_CLASSIC_PAIRING_OOB
9542 /**
9543  * @brief Report Remote OOB Data
9544  * @param bd_addr
9545  * @param c_192 Simple Pairing Hash C derived from P-192 public key
9546  * @param r_192 Simple Pairing Randomizer derived from P-192 public key
9547  * @param c_256 Simple Pairing Hash C derived from P-256 public key
9548  * @param r_256 Simple Pairing Randomizer derived from P-256 public key
9549  */
9550 uint8_t gap_ssp_remote_oob_data(const bd_addr_t addr, const uint8_t * c_192, const uint8_t * r_192, const uint8_t * c_256, const uint8_t * r_256){
9551     hci_connection_t * connection = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL);
9552     if (connection == NULL) {
9553         return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
9554     }
9555     connection->classic_oob_c_192 = c_192;
9556     connection->classic_oob_r_192 = r_192;
9557 
9558     // ignore P-256 if not supported by us
9559     if (hci_stack->secure_connections_active){
9560         connection->classic_oob_c_256 = c_256;
9561         connection->classic_oob_r_256 = r_256;
9562     }
9563 
9564     return ERROR_CODE_SUCCESS;
9565 }
9566 /**
9567  * @brief Generate new OOB data
9568  * @note OOB data will be provided in GAP_EVENT_LOCAL_OOB_DATA and be used in future pairing procedures
9569  */
9570 void gap_ssp_generate_oob_data(void){
9571     hci_stack->classic_read_local_oob_data = true;
9572     hci_run();
9573 }
9574 
9575 #endif
9576 
9577 #ifdef ENABLE_EXPLICIT_LINK_KEY_REPLY
9578 uint8_t gap_send_link_key_response(const bd_addr_t addr, link_key_t link_key, link_key_type_t type){
9579     hci_connection_t * connection = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL);
9580     if (connection == NULL) {
9581         return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
9582     }
9583 
9584     memcpy(connection->link_key, link_key, sizeof(link_key_t));
9585     connection->link_key_type = type;
9586 
9587     return gap_set_auth_flag_and_run(addr, AUTH_FLAG_HANDLE_LINK_KEY_REQUEST);
9588 }
9589 
9590 #endif // ENABLE_EXPLICIT_LINK_KEY_REPLY
9591 /**
9592  * @brief Set inquiry mode: standard, with RSSI, with RSSI + Extended Inquiry Results. Has to be called before power on.
9593  * @param inquiry_mode see bluetooth_defines.h
9594  */
9595 void hci_set_inquiry_mode(inquiry_mode_t inquiry_mode){
9596     hci_stack->inquiry_mode = inquiry_mode;
9597 }
9598 
9599 /**
9600  * @brief Configure Voice Setting for use with SCO data in HSP/HFP
9601  */
9602 void hci_set_sco_voice_setting(uint16_t voice_setting){
9603     hci_stack->sco_voice_setting = voice_setting;
9604 }
9605 
9606 /**
9607  * @brief Get SCO Voice Setting
9608  * @return current voice setting
9609  */
9610 uint16_t hci_get_sco_voice_setting(void){
9611     return hci_stack->sco_voice_setting;
9612 }
9613 
9614 static int hci_have_usb_transport(void){
9615     if (!hci_stack->hci_transport) return 0;
9616     const char * transport_name = hci_stack->hci_transport->name;
9617     if (!transport_name) return 0;
9618     return (transport_name[0] == 'H') && (transport_name[1] == '2');
9619 }
9620 
9621 static uint16_t hci_sco_packet_length_for_payload_length(uint16_t payload_size){
9622     uint16_t sco_packet_length = 0;
9623 
9624 #if defined(ENABLE_SCO_OVER_HCI) || defined (HAVE_SCO_TRANSPORT)
9625     // Transparent = mSBC => 1, CVSD with 16-bit samples requires twice as many bytes
9626     int multiplier;
9627     if (((hci_stack->sco_voice_setting_active & 0x03) != 0x03) &&
9628         ((hci_stack->sco_voice_setting_active & 0x20) == 0x20)) {
9629         multiplier = 2;
9630     } else {
9631         multiplier = 1;
9632     }
9633 #endif
9634 
9635 #ifdef ENABLE_SCO_OVER_HCI
9636     if (hci_have_usb_transport()){
9637         // see Core Spec for H2 USB Transfer.
9638         // 3 byte SCO header + 24 bytes per connection
9639         // @note multiple sco connections not supported currently
9640         sco_packet_length = 3 + 24 * multiplier;
9641     } else {
9642         // 3 byte SCO header + SCO packet length over the air
9643         sco_packet_length = 3 + payload_size * multiplier;
9644         // assert that it still fits inside an SCO buffer
9645         if (sco_packet_length > (hci_stack->sco_data_packet_length + 3)){
9646             sco_packet_length = 3 + hci_stack->sco_data_packet_length;
9647         }
9648     }
9649 #endif
9650 #ifdef HAVE_SCO_TRANSPORT
9651     // 3 byte SCO header + SCO packet length over the air
9652     sco_packet_length = 3 + payload_size * multiplier;
9653     // assert that it still fits inside an SCO buffer
9654     if (sco_packet_length > (hci_stack->sco_data_packet_length + 3)){
9655         sco_packet_length = 3 + hci_stack->sco_data_packet_length;
9656     }
9657 #endif
9658     return sco_packet_length;
9659 }
9660 
9661 uint16_t hci_get_sco_packet_length_for_connection(hci_con_handle_t sco_con_handle){
9662     hci_connection_t * connection = hci_connection_for_handle(sco_con_handle);
9663     if (connection != NULL){
9664         return hci_sco_packet_length_for_payload_length(connection->sco_payload_length);
9665     }
9666     return 0;
9667 }
9668 
9669 uint16_t hci_get_sco_packet_length(void){
9670     btstack_linked_list_iterator_t it;
9671     btstack_linked_list_iterator_init(&it, &hci_stack->connections);
9672     while (btstack_linked_list_iterator_has_next(&it)){
9673         hci_connection_t * connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it);
9674         if ( connection->address_type == BD_ADDR_TYPE_SCO ) {
9675             return hci_sco_packet_length_for_payload_length(connection->sco_payload_length);;
9676         }
9677     }
9678     return 0;
9679 }
9680 
9681 /**
9682 * @brief Sets the master/slave policy
9683 * @param policy (0: attempt to become master, 1: let connecting device decide)
9684 */
9685 void hci_set_master_slave_policy(uint8_t policy){
9686     hci_stack->master_slave_policy = policy;
9687 }
9688 
9689 #endif
9690 
9691 HCI_STATE hci_get_state(void){
9692     return hci_stack->state;
9693 }
9694 
9695 #ifdef ENABLE_CLASSIC
9696 void gap_register_classic_connection_filter(int (*accept_callback)(bd_addr_t addr, hci_link_type_t link_type)){
9697     hci_stack->gap_classic_accept_callback = accept_callback;
9698 }
9699 #endif
9700 
9701 /**
9702  * @brief Set callback for Bluetooth Hardware Error
9703  */
9704 void hci_set_hardware_error_callback(void (*fn)(uint8_t error)){
9705     hci_stack->hardware_error_callback = fn;
9706 }
9707 
9708 void hci_disconnect_all(void){
9709     btstack_linked_list_iterator_t it;
9710     btstack_linked_list_iterator_init(&it, &hci_stack->connections);
9711     while (btstack_linked_list_iterator_has_next(&it)){
9712         hci_connection_t * con = (hci_connection_t*) btstack_linked_list_iterator_next(&it);
9713         if (con->state == SENT_DISCONNECT) continue;
9714         con->state = SEND_DISCONNECT;
9715     }
9716     hci_run();
9717 }
9718 
9719 uint16_t hci_get_manufacturer(void){
9720     return hci_stack->manufacturer;
9721 }
9722 
9723 #ifdef ENABLE_BLE
9724 static sm_connection_t * sm_get_connection_for_handle(hci_con_handle_t con_handle){
9725     hci_connection_t * hci_con = hci_connection_for_handle(con_handle);
9726     if (!hci_con) return NULL;
9727     return &hci_con->sm_connection;
9728 }
9729 
9730 // extracted from sm.c to allow enabling of l2cap le data channels without adding sm.c to the build
9731 // without sm.c default values from create_connection_for_bd_addr_and_type() result in non-encrypted, not-authenticated
9732 #endif
9733 
9734 uint8_t gap_encryption_key_size(hci_con_handle_t con_handle){
9735     hci_connection_t * hci_connection = hci_connection_for_handle(con_handle);
9736     if (hci_connection == NULL) return 0;
9737     if (hci_is_le_connection(hci_connection)){
9738 #ifdef ENABLE_BLE
9739         sm_connection_t * sm_conn = &hci_connection->sm_connection;
9740         if (sm_conn->sm_connection_encrypted != 0u) {
9741             return sm_conn->sm_actual_encryption_key_size;
9742         }
9743 #endif
9744     } else {
9745 #ifdef ENABLE_CLASSIC
9746         if ((hci_connection->authentication_flags & AUTH_FLAG_CONNECTION_ENCRYPTED)){
9747             return hci_connection->encryption_key_size;
9748         }
9749 #endif
9750     }
9751     return 0;
9752 }
9753 
9754 bool gap_authenticated(hci_con_handle_t con_handle){
9755     hci_connection_t * hci_connection = hci_connection_for_handle(con_handle);
9756     if (hci_connection == NULL) return false;
9757 
9758     switch (hci_connection->address_type){
9759 #ifdef ENABLE_BLE
9760         case BD_ADDR_TYPE_LE_PUBLIC:
9761         case BD_ADDR_TYPE_LE_RANDOM:
9762         case BD_ADDR_TYPE_LE_PUBLIC_IDENTITY:
9763         case BD_ADDR_TYPE_LE_RANDOM_IDENTITY:
9764             if (hci_connection->sm_connection.sm_connection_encrypted == 0) return 0; // unencrypted connection cannot be authenticated
9765             return hci_connection->sm_connection.sm_connection_authenticated != 0;
9766 #endif
9767 #ifdef ENABLE_CLASSIC
9768         case BD_ADDR_TYPE_SCO:
9769         case BD_ADDR_TYPE_ACL:
9770             return gap_authenticated_for_link_key_type(hci_connection->link_key_type);
9771 #endif
9772         default:
9773             return false;
9774     }
9775 }
9776 
9777 bool gap_secure_connection(hci_con_handle_t con_handle){
9778     hci_connection_t * hci_connection = hci_connection_for_handle(con_handle);
9779     if (hci_connection == NULL) return 0;
9780 
9781     switch (hci_connection->address_type){
9782 #ifdef ENABLE_BLE
9783         case BD_ADDR_TYPE_LE_PUBLIC:
9784         case BD_ADDR_TYPE_LE_RANDOM:
9785         case BD_ADDR_TYPE_LE_PUBLIC_IDENTITY:
9786         case BD_ADDR_TYPE_LE_RANDOM_IDENTITY:
9787             if (hci_connection->sm_connection.sm_connection_encrypted == 0) return false; // unencrypted connection cannot be authenticated
9788             return hci_connection->sm_connection.sm_connection_sc;
9789 #endif
9790 #ifdef ENABLE_CLASSIC
9791         case BD_ADDR_TYPE_SCO:
9792         case BD_ADDR_TYPE_ACL:
9793             return gap_secure_connection_for_link_key_type(hci_connection->link_key_type);
9794 #endif
9795         default:
9796             return false;
9797     }
9798 }
9799 
9800 bool gap_bonded(hci_con_handle_t con_handle){
9801 	hci_connection_t * hci_connection = hci_connection_for_handle(con_handle);
9802 	if (hci_connection == NULL) return 0;
9803 
9804 #ifdef ENABLE_CLASSIC
9805 	link_key_t link_key;
9806 	link_key_type_t link_key_type;
9807 #endif
9808 	switch (hci_connection->address_type){
9809 #ifdef ENABLE_BLE
9810 		case BD_ADDR_TYPE_LE_PUBLIC:
9811 		case BD_ADDR_TYPE_LE_RANDOM:
9812 	    case BD_ADDR_TYPE_LE_PUBLIC_IDENTITY:
9813         case BD_ADDR_TYPE_LE_RANDOM_IDENTITY:
9814             return hci_connection->sm_connection.sm_le_db_index >= 0;
9815 #endif
9816 #ifdef ENABLE_CLASSIC
9817 		case BD_ADDR_TYPE_SCO:
9818 		case BD_ADDR_TYPE_ACL:
9819 			return hci_stack->link_key_db && hci_stack->link_key_db->get_link_key(hci_connection->address, link_key, &link_key_type);
9820 #endif
9821 		default:
9822 			return false;
9823 	}
9824 }
9825 
9826 #ifdef ENABLE_BLE
9827 authorization_state_t gap_authorization_state(hci_con_handle_t con_handle){
9828     sm_connection_t * sm_conn = sm_get_connection_for_handle(con_handle);
9829     if (sm_conn == NULL)                             return AUTHORIZATION_UNKNOWN; // wrong connection
9830     if (sm_conn->sm_connection_encrypted == 0u)      return AUTHORIZATION_UNKNOWN; // unencrypted connection cannot be authorized
9831     if (sm_conn->sm_connection_authenticated == 0u)  return AUTHORIZATION_UNKNOWN; // unauthenticated connection cannot be authorized
9832     return sm_conn->sm_connection_authorization_state;
9833 }
9834 #endif
9835 
9836 #ifdef ENABLE_CLASSIC
9837 uint8_t gap_sniff_mode_enter(hci_con_handle_t con_handle, uint16_t sniff_min_interval, uint16_t sniff_max_interval, uint16_t sniff_attempt, uint16_t sniff_timeout){
9838     hci_connection_t * conn = hci_connection_for_handle(con_handle);
9839     if (!conn) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
9840     conn->sniff_min_interval = sniff_min_interval;
9841     conn->sniff_max_interval = sniff_max_interval;
9842     conn->sniff_attempt = sniff_attempt;
9843     conn->sniff_timeout = sniff_timeout;
9844     hci_run();
9845     return 0;
9846 }
9847 
9848 /**
9849  * @brief Exit Sniff mode
9850  * @param con_handle
9851  @ @return 0 if ok
9852  */
9853 uint8_t gap_sniff_mode_exit(hci_con_handle_t con_handle){
9854     hci_connection_t * conn = hci_connection_for_handle(con_handle);
9855     if (!conn) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
9856     conn->sniff_min_interval = 0xffff;
9857     hci_run();
9858     return 0;
9859 }
9860 
9861 uint8_t gap_sniff_subrating_configure(hci_con_handle_t con_handle, uint16_t max_latency, uint16_t min_remote_timeout, uint16_t min_local_timeout){
9862     hci_connection_t * conn = hci_connection_for_handle(con_handle);
9863     if (!conn) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
9864     conn->sniff_subrating_max_latency = max_latency;
9865     conn->sniff_subrating_min_remote_timeout = min_remote_timeout;
9866     conn->sniff_subrating_min_local_timeout = min_local_timeout;
9867     hci_run();
9868     return ERROR_CODE_SUCCESS;
9869 }
9870 
9871 uint8_t gap_qos_set(hci_con_handle_t con_handle, hci_service_type_t service_type, uint32_t token_rate, uint32_t peak_bandwidth, uint32_t latency, uint32_t delay_variation){
9872     hci_connection_t * conn = hci_connection_for_handle(con_handle);
9873     if (!conn) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
9874     conn->qos_service_type = service_type;
9875     conn->qos_token_rate = token_rate;
9876     conn->qos_peak_bandwidth = peak_bandwidth;
9877     conn->qos_latency = latency;
9878     conn->qos_delay_variation = delay_variation;
9879     hci_run();
9880     return ERROR_CODE_SUCCESS;
9881 }
9882 
9883 void gap_set_page_scan_activity(uint16_t page_scan_interval, uint16_t page_scan_window){
9884     hci_stack->new_page_scan_interval = page_scan_interval;
9885     hci_stack->new_page_scan_window = page_scan_window;
9886     hci_stack->gap_tasks_classic |= GAP_TASK_WRITE_PAGE_SCAN_ACTIVITY;
9887     hci_run();
9888 }
9889 
9890 void gap_set_page_scan_type(page_scan_type_t page_scan_type){
9891     hci_stack->new_page_scan_type = (uint8_t) page_scan_type;
9892     hci_stack->gap_tasks_classic |= GAP_TASK_WRITE_PAGE_SCAN_TYPE;
9893     hci_run();
9894 }
9895 
9896 void gap_set_page_timeout(uint16_t page_timeout){
9897     hci_stack->page_timeout = page_timeout;
9898     hci_stack->gap_tasks_classic |= GAP_TASK_WRITE_PAGE_TIMEOUT;
9899     hci_run();
9900 }
9901 
9902 #endif
9903 
9904 #ifdef ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION
9905 void hci_load_le_device_db_entry_into_resolving_list(uint16_t le_device_db_index){
9906     if (le_device_db_index >= MAX_NUM_RESOLVING_LIST_ENTRIES) return;
9907     if (le_device_db_index >= le_device_db_max_count()) return;
9908     uint8_t offset = le_device_db_index >> 3;
9909     uint8_t mask = 1 << (le_device_db_index & 7);
9910     hci_stack->le_resolving_list_add_entries[offset] |= mask;
9911     hci_stack->le_resolving_list_set_privacy_mode[offset] |= mask;
9912     if (hci_stack->le_resolving_list_state == LE_RESOLVING_LIST_DONE){
9913     	// note: go back to remove entries, otherwise, a remove + add will skip the add
9914         hci_stack->le_resolving_list_state = LE_RESOLVING_LIST_UPDATES_ENTRIES;
9915     }
9916 }
9917 
9918 void hci_remove_le_device_db_entry_from_resolving_list(uint16_t le_device_db_index){
9919 	if (le_device_db_index >= MAX_NUM_RESOLVING_LIST_ENTRIES) return;
9920 	if (le_device_db_index >= le_device_db_max_count()) return;
9921 	uint8_t offset = le_device_db_index >> 3;
9922 	uint8_t mask = 1 << (le_device_db_index & 7);
9923 	hci_stack->le_resolving_list_remove_entries[offset] |= mask;
9924 	if (hci_stack->le_resolving_list_state == LE_RESOLVING_LIST_DONE){
9925 		hci_stack->le_resolving_list_state = LE_RESOLVING_LIST_UPDATES_ENTRIES;
9926 	}
9927 }
9928 
9929 uint8_t gap_load_resolving_list_from_le_device_db(void){
9930     if (hci_command_supported(SUPPORTED_HCI_COMMAND_LE_SET_ADDRESS_RESOLUTION_ENABLE) == false){
9931 		return ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE;
9932 	}
9933 	if (hci_stack->le_resolving_list_state != LE_RESOLVING_LIST_SEND_ENABLE_ADDRESS_RESOLUTION){
9934 		// restart le resolving list update
9935 		hci_stack->le_resolving_list_state = LE_RESOLVING_LIST_READ_SIZE;
9936 	}
9937 	return ERROR_CODE_SUCCESS;
9938 }
9939 
9940 void gap_set_peer_privacy_mode(le_privacy_mode_t privacy_mode ){
9941     hci_stack->le_privacy_mode = privacy_mode;
9942 }
9943 #endif
9944 
9945 #ifdef ENABLE_BLE
9946 #ifdef ENABLE_LE_CENTRAL
9947 #ifdef ENABLE_LE_EXTENDED_ADVERTISING
9948 
9949 static uint8_t hci_periodic_advertiser_list_add(bd_addr_type_t address_type, const bd_addr_t address, uint8_t advertising_sid){
9950 
9951 #if !defined(HAVE_MALLOC) && (!defined(MAX_NR_PERIODIC_ADVERTISER_LIST_ENTRIES) || (MAX_NR_PERIODIC_ADVERTISER_LIST_ENTRIES == 0))
9952     // incorrect configuration:
9953     // - as MAX_NR_PERIODIC_ADVERTISER_LIST_ENTRIES is not defined or zero this function always fails
9954     // - please set MAX_NR_PERIODIC_ADVERTISER_LIST_ENTRIES in btstack_config.h
9955     btstack_assert(false);
9956 #endif
9957 
9958     // check if already in list
9959     btstack_linked_list_iterator_t it;
9960     btstack_linked_list_iterator_init(&it, &hci_stack->le_periodic_advertiser_list);
9961     while (btstack_linked_list_iterator_has_next(&it)) {
9962         periodic_advertiser_list_entry_t *entry = (periodic_advertiser_list_entry_t *) btstack_linked_list_iterator_next(&it);
9963         if (entry->sid != advertising_sid) {
9964             continue;
9965         }
9966         if (entry->address_type != address_type) {
9967             continue;
9968         }
9969         if (memcmp(entry->address, address, 6) != 0) {
9970             continue;
9971         }
9972         // disallow if already scheduled to add
9973         if ((entry->state & LE_PERIODIC_ADVERTISER_LIST_ENTRY_ADD_TO_CONTROLLER) != 0){
9974             return ERROR_CODE_COMMAND_DISALLOWED;
9975         }
9976         // still on controller, but scheduled to remove -> re-add
9977         entry->state |= LE_PERIODIC_ADVERTISER_LIST_ENTRY_ADD_TO_CONTROLLER;
9978         return ERROR_CODE_SUCCESS;
9979     }
9980     // alloc and add to list
9981     periodic_advertiser_list_entry_t * entry = btstack_memory_periodic_advertiser_list_entry_get();
9982     if (!entry) return BTSTACK_MEMORY_ALLOC_FAILED;
9983     entry->sid = advertising_sid;
9984     entry->address_type = address_type;
9985     (void)memcpy(entry->address, address, 6);
9986     entry->state = LE_PERIODIC_ADVERTISER_LIST_ENTRY_ADD_TO_CONTROLLER;
9987     btstack_linked_list_add(&hci_stack->le_periodic_advertiser_list, (btstack_linked_item_t*) entry);
9988     return ERROR_CODE_SUCCESS;
9989 }
9990 
9991 static uint8_t hci_periodic_advertiser_list_remove(bd_addr_type_t address_type, const bd_addr_t address, uint8_t advertising_sid){
9992     btstack_linked_list_iterator_t it;
9993     btstack_linked_list_iterator_init(&it, &hci_stack->le_periodic_advertiser_list);
9994     while (btstack_linked_list_iterator_has_next(&it)){
9995         periodic_advertiser_list_entry_t * entry = (periodic_advertiser_list_entry_t*) btstack_linked_list_iterator_next(&it);
9996         if (entry->sid != advertising_sid) {
9997             continue;
9998         }
9999         if (entry->address_type != address_type) {
10000             continue;
10001         }
10002         if (memcmp(entry->address, address, 6) != 0) {
10003             continue;
10004         }
10005         if (entry->state & LE_PERIODIC_ADVERTISER_LIST_ENTRY_ON_CONTROLLER){
10006             // remove from controller if already present
10007             entry->state |= LE_PERIODIC_ADVERTISER_LIST_ENTRY_REMOVE_FROM_CONTROLLER;
10008         }  else {
10009             // directly remove entry from whitelist
10010             btstack_linked_list_iterator_remove(&it);
10011             btstack_memory_periodic_advertiser_list_entry_free(entry);
10012         }
10013         return ERROR_CODE_SUCCESS;
10014     }
10015     return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
10016 }
10017 
10018 static void hci_periodic_advertiser_list_clear(void){
10019     btstack_linked_list_iterator_t it;
10020     btstack_linked_list_iterator_init(&it, &hci_stack->le_periodic_advertiser_list);
10021     while (btstack_linked_list_iterator_has_next(&it)){
10022         periodic_advertiser_list_entry_t * entry = (periodic_advertiser_list_entry_t*) btstack_linked_list_iterator_next(&it);
10023         if (entry->state & LE_PERIODIC_ADVERTISER_LIST_ENTRY_ON_CONTROLLER){
10024             // remove from controller if already present
10025             entry->state |= LE_PERIODIC_ADVERTISER_LIST_ENTRY_REMOVE_FROM_CONTROLLER;
10026             continue;
10027         }
10028         // directly remove entry from whitelist
10029         btstack_linked_list_iterator_remove(&it);
10030         btstack_memory_periodic_advertiser_list_entry_free(entry);
10031     }
10032 }
10033 
10034 uint8_t gap_periodic_advertiser_list_clear(void){
10035     hci_periodic_advertiser_list_clear();
10036     hci_run();
10037     return ERROR_CODE_SUCCESS;
10038 }
10039 
10040 uint8_t gap_periodic_advertiser_list_add(bd_addr_type_t address_type, const bd_addr_t address, uint8_t advertising_sid){
10041     uint8_t status = hci_periodic_advertiser_list_add(address_type, address, advertising_sid);
10042     if (status){
10043         return status;
10044     }
10045     hci_run();
10046     return ERROR_CODE_SUCCESS;
10047 }
10048 
10049 uint8_t gap_periodic_advertiser_list_remove(bd_addr_type_t address_type, const bd_addr_t address, uint8_t advertising_sid){
10050     uint8_t status = hci_periodic_advertiser_list_remove(address_type, address, advertising_sid);
10051     if (status){
10052         return status;
10053     }
10054     hci_run();
10055     return ERROR_CODE_SUCCESS;
10056 }
10057 
10058 uint8_t gap_periodic_advertising_create_sync(uint8_t options, uint8_t advertising_sid, bd_addr_type_t advertiser_address_type,
10059                                              bd_addr_t advertiser_address, uint16_t skip, uint16_t sync_timeout, uint8_t sync_cte_type){
10060     // abort if already active
10061     if (hci_stack->le_periodic_sync_request != LE_CONNECTING_IDLE) {
10062         return ERROR_CODE_COMMAND_DISALLOWED;
10063     }
10064     // store request
10065     hci_stack->le_periodic_sync_request = ((options & 0) != 0) ? LE_CONNECTING_WHITELIST : LE_CONNECTING_DIRECT;
10066     hci_stack->le_periodic_sync_options = options;
10067     hci_stack->le_periodic_sync_advertising_sid = advertising_sid;
10068     hci_stack->le_periodic_sync_advertiser_address_type = advertiser_address_type;
10069     memcpy(hci_stack->le_periodic_sync_advertiser_address, advertiser_address, 6);
10070     hci_stack->le_periodic_sync_skip = skip;
10071     hci_stack->le_periodic_sync_timeout = sync_timeout;
10072     hci_stack->le_periodic_sync_cte_type = sync_cte_type;
10073 
10074     hci_run();
10075     return ERROR_CODE_SUCCESS;
10076 }
10077 
10078 uint8_t gap_periodic_advertising_create_sync_cancel(void){
10079     // abort if not requested
10080     if (hci_stack->le_periodic_sync_request == LE_CONNECTING_IDLE) {
10081         return ERROR_CODE_COMMAND_DISALLOWED;
10082     }
10083     hci_stack->le_periodic_sync_request = LE_CONNECTING_IDLE;
10084     hci_run();
10085     return ERROR_CODE_SUCCESS;
10086 }
10087 
10088 uint8_t gap_periodic_advertising_terminate_sync(uint16_t sync_handle){
10089     if (hci_stack->le_periodic_terminate_sync_handle != HCI_CON_HANDLE_INVALID){
10090         return ERROR_CODE_COMMAND_DISALLOWED;
10091     }
10092     hci_stack->le_periodic_terminate_sync_handle = sync_handle;
10093     hci_run();
10094     return ERROR_CODE_SUCCESS;
10095 }
10096 
10097 #endif
10098 #endif
10099 #ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
10100 static hci_iso_stream_t *
10101 hci_iso_stream_create(hci_iso_type_t iso_type, hci_iso_stream_state_t state, uint8_t group_id, uint8_t stream_id) {
10102     hci_iso_stream_t * iso_stream = btstack_memory_hci_iso_stream_get();
10103     if (iso_stream != NULL){
10104         iso_stream->iso_type = iso_type;
10105         iso_stream->state = state;
10106         iso_stream->group_id = group_id;
10107         iso_stream->stream_id = stream_id;
10108         iso_stream->cis_handle = HCI_CON_HANDLE_INVALID;
10109         iso_stream->acl_handle = HCI_CON_HANDLE_INVALID;
10110         btstack_linked_list_add(&hci_stack->iso_streams, (btstack_linked_item_t*) iso_stream);
10111     }
10112     return iso_stream;
10113 }
10114 
10115 static hci_iso_stream_t * hci_iso_stream_for_con_handle(hci_con_handle_t con_handle){
10116     btstack_linked_list_iterator_t it;
10117     btstack_linked_list_iterator_init(&it, &hci_stack->iso_streams);
10118     while (btstack_linked_list_iterator_has_next(&it)){
10119         hci_iso_stream_t * iso_stream = (hci_iso_stream_t *) btstack_linked_list_iterator_next(&it);
10120         if (iso_stream->cis_handle == con_handle ) {
10121             return iso_stream;
10122         }
10123     }
10124     return NULL;
10125 }
10126 
10127 static void hci_iso_stream_finalize(hci_iso_stream_t * iso_stream){
10128     log_info("hci_iso_stream_finalize con_handle 0x%04x, group_id 0x%02x", iso_stream->cis_handle, iso_stream->group_id);
10129     btstack_linked_list_remove(&hci_stack->iso_streams, (btstack_linked_item_t*) iso_stream);
10130     btstack_memory_hci_iso_stream_free(iso_stream);
10131 }
10132 
10133 static void hci_iso_stream_finalize_by_type_and_group_id(hci_iso_type_t iso_type, uint8_t group_id) {
10134     btstack_linked_list_iterator_t it;
10135     btstack_linked_list_iterator_init(&it, &hci_stack->iso_streams);
10136     while (btstack_linked_list_iterator_has_next(&it)){
10137         hci_iso_stream_t * iso_stream = (hci_iso_stream_t *) btstack_linked_list_iterator_next(&it);
10138         if ((iso_stream->group_id == group_id) &&
10139             (iso_stream->iso_type == iso_type)){
10140             btstack_linked_list_iterator_remove(&it);
10141             btstack_memory_hci_iso_stream_free(iso_stream);
10142         }
10143     }
10144 }
10145 
10146 static void hci_iso_stream_requested_finalize(uint8_t group_id) {
10147     btstack_linked_list_iterator_t it;
10148     btstack_linked_list_iterator_init(&it, &hci_stack->iso_streams);
10149     while (btstack_linked_list_iterator_has_next(&it)){
10150         hci_iso_stream_t * iso_stream = (hci_iso_stream_t *) btstack_linked_list_iterator_next(&it);
10151         if ((iso_stream->state == HCI_ISO_STREAM_STATE_REQUESTED ) &&
10152             (iso_stream->group_id == group_id)){
10153             btstack_linked_list_iterator_remove(&it);
10154             btstack_memory_hci_iso_stream_free(iso_stream);
10155         }
10156     }
10157 }
10158 static void hci_iso_stream_requested_confirm(uint8_t big_handle){
10159     btstack_linked_list_iterator_t it;
10160     btstack_linked_list_iterator_init(&it, &hci_stack->iso_streams);
10161     while (btstack_linked_list_iterator_has_next(&it)){
10162         hci_iso_stream_t * iso_stream = (hci_iso_stream_t *) btstack_linked_list_iterator_next(&it);
10163         if ( iso_stream->state == HCI_ISO_STREAM_STATE_REQUESTED ) {
10164             iso_stream->state = HCI_ISO_STREAM_STATE_W4_ESTABLISHED;
10165         }
10166     }
10167 }
10168 
10169 static bool hci_iso_sdu_complete(uint8_t * packet, uint16_t size){
10170     uint8_t  sdu_ts_flag = (packet[1] >> 6) & 1;
10171     uint16_t sdu_len_offset = 6 + (sdu_ts_flag * 4);
10172     uint16_t sdu_len = little_endian_read_16(packet, sdu_len_offset) & 0x0fff;
10173     return (sdu_len_offset + 2 + sdu_len) == size;
10174 }
10175 
10176 static void hci_iso_packet_handler(hci_iso_stream_t *iso_stream, uint8_t *packet, uint16_t size) {
10177     if (iso_stream == NULL){
10178         log_error("acl_handler called with non-registered handle %u!" , READ_ISO_CONNECTION_HANDLE(packet));
10179         return;
10180     }
10181 
10182     if (hci_stack->iso_packet_handler == NULL) {
10183         return;
10184     }
10185 
10186     // parse header
10187     uint16_t con_handle_and_flags = little_endian_read_16(packet, 0);
10188     uint16_t data_total_length = little_endian_read_16(packet, 2);
10189     uint8_t  pb_flag = (con_handle_and_flags >> 12) & 3;
10190 
10191     // assert packet is complete
10192     if ((data_total_length + 4u) != size){
10193         return;
10194     }
10195 
10196     if ((pb_flag & 0x01) == 0){
10197         if (pb_flag == 0x02){
10198             // The ISO_SDU_Fragment field contains a header and a complete SDU.
10199             if (hci_iso_sdu_complete(packet, size)) {
10200                 (hci_stack->iso_packet_handler)(HCI_ISO_DATA_PACKET, 0, packet, size);
10201             }
10202         } else {
10203             // The ISO_Data_Load field contains a header and the first fragment of a fragmented SDU.
10204             if (size > sizeof(iso_stream->reassembly_buffer)){
10205                 return;
10206             }
10207             memcpy(iso_stream->reassembly_buffer, packet, size);
10208             // fix pb_flag
10209             iso_stream->reassembly_buffer[1] = (iso_stream->reassembly_buffer[1] & 0xcf) | 0x20;
10210             iso_stream->reassembly_pos = size;
10211         }
10212     } else {
10213         // ISO_SDU_Fragment contains continuation or last fragment of an SDU
10214         uint8_t ts_flag = (con_handle_and_flags >> 14) & 1;
10215         if (ts_flag != 0){
10216            return;
10217         }
10218         // append fragment
10219         if (iso_stream->reassembly_pos == 0){
10220             return;
10221         }
10222 
10223         if ((iso_stream->reassembly_pos + data_total_length) > sizeof(iso_stream->reassembly_buffer)){
10224             // reset reassembly buffer
10225             iso_stream->reassembly_pos = 0;
10226             return;
10227         }
10228         memcpy(&iso_stream->reassembly_buffer[iso_stream->reassembly_pos], &packet[4], data_total_length);
10229         iso_stream->reassembly_pos += data_total_length;
10230 
10231         // deliver if last fragment and SDU complete
10232         if (pb_flag == 0x03){
10233             if (hci_iso_sdu_complete(iso_stream->reassembly_buffer, iso_stream->reassembly_pos)){
10234                 // fix data_total_length
10235                 little_endian_store_16(iso_stream->reassembly_buffer, 2, iso_stream->reassembly_pos - HCI_ISO_HEADER_SIZE);
10236                 (hci_stack->iso_packet_handler)(HCI_ISO_DATA_PACKET, 0, iso_stream->reassembly_buffer, iso_stream->reassembly_pos);
10237             }
10238             // reset reassembly buffer
10239             iso_stream->reassembly_pos = 0;
10240         }
10241     }
10242 }
10243 
10244 static void hci_emit_big_created(const le_audio_big_t * big, uint8_t status){
10245     uint8_t event [6 + (MAX_NR_BIS * 2)];
10246     uint16_t pos = 0;
10247     event[pos++] = HCI_EVENT_META_GAP;
10248     event[pos++] = 4 + (2 * big->num_bis);
10249     event[pos++] = GAP_SUBEVENT_BIG_CREATED;
10250     event[pos++] = status;
10251     event[pos++] = big->big_handle;
10252     event[pos++] = big->num_bis;
10253     uint8_t i;
10254     for (i=0;i<big->num_bis;i++){
10255         little_endian_store_16(event, pos, big->bis_con_handles[i]);
10256         pos += 2;
10257     }
10258     hci_emit_btstack_event(event, pos, 0);
10259 }
10260 
10261 static void hci_emit_cig_created(const le_audio_cig_t * cig, uint8_t status){
10262     uint8_t event [6 + (MAX_NR_CIS * 2)];
10263     uint16_t pos = 0;
10264     event[pos++] = HCI_EVENT_META_GAP;
10265     event[pos++] = 4 + (2 * cig->num_cis);
10266     event[pos++] = GAP_SUBEVENT_CIG_CREATED;
10267     event[pos++] = status;
10268     event[pos++] = cig->cig_id;
10269     event[pos++] = cig->num_cis;
10270     uint8_t i;
10271     for (i=0;i<cig->num_cis;i++){
10272         little_endian_store_16(event, pos, cig->cis_con_handles[i]);
10273         pos += 2;
10274     }
10275     hci_emit_btstack_event(event, pos, 0);
10276 }
10277 
10278 static uint16_t hci_setup_cis_created(uint8_t * event, hci_iso_stream_t * iso_stream, uint8_t status) {
10279     uint16_t pos = 0;
10280     event[pos++] = HCI_EVENT_META_GAP;
10281     event[pos++] = 8;
10282     event[pos++] = GAP_SUBEVENT_CIS_CREATED;
10283     event[pos++] = status;
10284     event[pos++] = iso_stream->group_id;
10285     event[pos++] = iso_stream->stream_id;
10286     little_endian_store_16(event, pos, iso_stream->cis_handle);
10287     pos += 2;
10288     little_endian_store_16(event, pos, iso_stream->acl_handle);
10289     pos += 2;
10290     little_endian_store_16(event, pos, iso_stream->iso_interval_1250us);
10291     pos += 2;
10292     event[pos++] = iso_stream->number_of_subevents;
10293     event[pos++] = iso_stream->burst_number_c_to_p;
10294     event[pos++] = iso_stream->burst_number_p_to_c;
10295     event[pos++] = iso_stream->flush_timeout_c_to_p;
10296     event[pos++] = iso_stream->flush_timeout_p_to_c;
10297     return pos;
10298 }
10299 
10300 // emits GAP_SUBEVENT_CIS_CREATED after calling hci_iso_finalize
10301 static void hci_cis_handle_created(hci_iso_stream_t * iso_stream, uint8_t status){
10302     // cache data before finalizing struct
10303     uint8_t event [17];
10304     uint16_t pos = hci_setup_cis_created(event, iso_stream, status);
10305     btstack_assert(pos <= sizeof(event));
10306     if (status != ERROR_CODE_SUCCESS){
10307         hci_iso_stream_finalize(iso_stream);
10308     }
10309     hci_emit_btstack_event(event, pos, 0);
10310 }
10311 
10312 static void hci_emit_big_terminated(const le_audio_big_t * big){
10313     uint8_t event [4];
10314     uint16_t pos = 0;
10315     event[pos++] = HCI_EVENT_META_GAP;
10316     event[pos++] = 2;
10317     event[pos++] = GAP_SUBEVENT_BIG_TERMINATED;
10318     event[pos++] = big->big_handle;
10319     hci_emit_btstack_event(event, pos, 0);
10320 }
10321 
10322 static void hci_emit_big_sync_created(const le_audio_big_sync_t * big_sync, uint8_t status){
10323     uint8_t event [6 + (MAX_NR_BIS * 2)];
10324     uint16_t pos = 0;
10325     event[pos++] = HCI_EVENT_META_GAP;
10326     event[pos++] = 4;
10327     event[pos++] = GAP_SUBEVENT_BIG_SYNC_CREATED;
10328     event[pos++] = status;
10329     event[pos++] = big_sync->big_handle;
10330     event[pos++] = big_sync->num_bis;
10331     uint8_t i;
10332     for (i=0;i<big_sync->num_bis;i++){
10333         little_endian_store_16(event, pos, big_sync->bis_con_handles[i]);
10334         pos += 2;
10335     }
10336     hci_emit_btstack_event(event, pos, 0);
10337 }
10338 
10339 static void hci_emit_big_sync_stopped(uint8_t big_handle){
10340     uint8_t event [4];
10341     uint16_t pos = 0;
10342     event[pos++] = HCI_EVENT_META_GAP;
10343     event[pos++] = 2;
10344     event[pos++] = GAP_SUBEVENT_BIG_SYNC_STOPPED;
10345     event[pos++] = big_handle;
10346     hci_emit_btstack_event(event, pos, 0);
10347 }
10348 
10349 static void hci_emit_bis_can_send_now(const le_audio_big_t *big, uint8_t bis_index) {
10350     uint8_t event[6];
10351     uint16_t pos = 0;
10352     event[pos++] = HCI_EVENT_BIS_CAN_SEND_NOW;
10353     event[pos++] = sizeof(event) - 2;
10354     event[pos++] = big->big_handle;
10355     event[pos++] = bis_index;
10356     little_endian_store_16(event, pos, big->bis_con_handles[bis_index]);
10357     hci_emit_btstack_event(&event[0], sizeof(event), 0);  // don't dump
10358 }
10359 
10360 static void hci_emit_cis_can_send_now(hci_con_handle_t cis_con_handle) {
10361     uint8_t event[4];
10362     uint16_t pos = 0;
10363     event[pos++] = HCI_EVENT_CIS_CAN_SEND_NOW;
10364     event[pos++] = sizeof(event) - 2;
10365     little_endian_store_16(event, pos, cis_con_handle);
10366     hci_emit_btstack_event(&event[0], sizeof(event), 0);  // don't dump
10367 }
10368 
10369 static le_audio_big_t * hci_big_for_handle(uint8_t big_handle){
10370     btstack_linked_list_iterator_t it;
10371     btstack_linked_list_iterator_init(&it, &hci_stack->le_audio_bigs);
10372     while (btstack_linked_list_iterator_has_next(&it)){
10373         le_audio_big_t * big = (le_audio_big_t *) btstack_linked_list_iterator_next(&it);
10374         if ( big->big_handle == big_handle ) {
10375             return big;
10376         }
10377     }
10378     return NULL;
10379 }
10380 
10381 static le_audio_big_sync_t * hci_big_sync_for_handle(uint8_t big_handle){
10382     btstack_linked_list_iterator_t it;
10383     btstack_linked_list_iterator_init(&it, &hci_stack->le_audio_big_syncs);
10384     while (btstack_linked_list_iterator_has_next(&it)){
10385         le_audio_big_sync_t * big_sync = (le_audio_big_sync_t *) btstack_linked_list_iterator_next(&it);
10386         if ( big_sync->big_handle == big_handle ) {
10387             return big_sync;
10388         }
10389     }
10390     return NULL;
10391 }
10392 
10393 void hci_set_num_iso_packets_to_queue(uint8_t num_packets){
10394     hci_stack->iso_packets_to_queue = num_packets;
10395 }
10396 
10397 static le_audio_cig_t * hci_cig_for_id(uint8_t cig_id){
10398     btstack_linked_list_iterator_t it;
10399     btstack_linked_list_iterator_init(&it, &hci_stack->le_audio_cigs);
10400     while (btstack_linked_list_iterator_has_next(&it)){
10401         le_audio_cig_t * cig = (le_audio_cig_t *) btstack_linked_list_iterator_next(&it);
10402         if ( cig->cig_id == cig_id ) {
10403             return cig;
10404         }
10405     }
10406     return NULL;
10407 }
10408 
10409 static void hci_iso_notify_can_send_now(void){
10410 
10411     // BIG
10412 
10413     btstack_linked_list_iterator_t it;
10414     btstack_linked_list_iterator_init(&it, &hci_stack->le_audio_bigs);
10415     while (btstack_linked_list_iterator_has_next(&it)){
10416         le_audio_big_t * big = (le_audio_big_t *) btstack_linked_list_iterator_next(&it);
10417         // track number completed packet timestamps
10418         if (big->num_completed_timestamp_current_valid){
10419             big->num_completed_timestamp_current_valid = false;
10420             if (big->num_completed_timestamp_previous_valid){
10421                 // detect delayed sending of all BIS: tolerate up to 50% delayed event handling
10422                 uint32_t iso_interval_missed_threshold_ms = big->params->sdu_interval_us * 3 / 2000;
10423                 int32_t  num_completed_timestamp_delta_ms = btstack_time_delta(big->num_completed_timestamp_current_ms,
10424                                                                                big->num_completed_timestamp_previous_ms);
10425                 if (num_completed_timestamp_delta_ms > iso_interval_missed_threshold_ms){
10426                     // to catch up, skip packet on all BIS
10427                     uint8_t i;
10428                     for (i=0;i<big->num_bis;i++){
10429                         hci_iso_stream_t * iso_stream = hci_iso_stream_for_con_handle(big->bis_con_handles[i]);
10430                         if (iso_stream){
10431                             iso_stream->num_packets_to_skip++;
10432                         }
10433                     }
10434                 }
10435             }
10436             big->num_completed_timestamp_previous_valid = true;
10437             big->num_completed_timestamp_previous_ms = big->num_completed_timestamp_current_ms;
10438         }
10439 
10440         if (big->can_send_now_requested){
10441             // check if no outgoing iso packets pending and no can send now have to be emitted
10442             uint8_t i;
10443             bool can_send = true;
10444             uint8_t num_iso_queued_minimum = 0;
10445             for (i=0;i<big->num_bis;i++){
10446                 hci_iso_stream_t * iso_stream = hci_iso_stream_for_con_handle(big->bis_con_handles[i]);
10447                 if (iso_stream == NULL) continue;
10448                 // handle case where individual ISO packet was sent too late:
10449                 // for each additionally queued packet, a new one needs to get skipped
10450                 if (i==0){
10451                     num_iso_queued_minimum = iso_stream->num_packets_sent;
10452                 } else if (iso_stream->num_packets_sent > num_iso_queued_minimum){
10453                     uint8_t num_packets_to_skip = iso_stream->num_packets_sent - num_iso_queued_minimum;
10454                     iso_stream->num_packets_to_skip += num_packets_to_skip;
10455                     iso_stream->num_packets_sent    -= num_packets_to_skip;
10456                 }
10457                 // check if we can send now
10458                 if  ((iso_stream->num_packets_sent >= hci_stack->iso_packets_to_queue) || (iso_stream->emit_ready_to_send)){
10459                     can_send = false;
10460                     break;
10461                 }
10462             }
10463             if (can_send){
10464                 // propagate can send now to individual streams
10465                 big->can_send_now_requested = false;
10466                 for (i=0;i<big->num_bis;i++){
10467                     hci_iso_stream_t * iso_stream = hci_iso_stream_for_con_handle(big->bis_con_handles[i]);
10468                     iso_stream->emit_ready_to_send = true;
10469                 }
10470             }
10471         }
10472     }
10473 
10474     if (hci_stack->hci_packet_buffer_reserved) return;
10475 
10476     btstack_linked_list_iterator_init(&it, &hci_stack->le_audio_bigs);
10477     while (btstack_linked_list_iterator_has_next(&it)){
10478         le_audio_big_t * big = (le_audio_big_t *) btstack_linked_list_iterator_next(&it);
10479         // report bis ready
10480         uint8_t i;
10481         for (i=0;i<big->num_bis;i++){
10482             hci_iso_stream_t * iso_stream = hci_iso_stream_for_con_handle(big->bis_con_handles[i]);
10483             if ((iso_stream != NULL) && iso_stream->emit_ready_to_send){
10484                 iso_stream->emit_ready_to_send = false;
10485                 hci_emit_bis_can_send_now(big, i);
10486                 if (hci_stack->hci_packet_buffer_reserved) return;
10487             }
10488         }
10489     }
10490 
10491 
10492     // CIS
10493     btstack_linked_list_iterator_init(&it, &hci_stack->iso_streams);
10494     while (btstack_linked_list_iterator_has_next(&it)) {
10495         hci_iso_stream_t *iso_stream = (hci_iso_stream_t *) btstack_linked_list_iterator_next(&it);
10496         if ((iso_stream->can_send_now_requested) &&
10497             (iso_stream->num_packets_sent < hci_stack->iso_packets_to_queue)){
10498             iso_stream->can_send_now_requested = false;
10499             hci_emit_cis_can_send_now(iso_stream->cis_handle);
10500             if (hci_stack->hci_packet_buffer_reserved) return;
10501         }
10502     }
10503 }
10504 
10505 static uint8_t gap_big_setup_iso_streams(uint8_t num_bis, uint8_t big_handle){
10506     // make big handle unique and usuable for big and big sync
10507     if (hci_big_for_handle(big_handle) != NULL){
10508         return ERROR_CODE_ACL_CONNECTION_ALREADY_EXISTS;
10509     }
10510     if (hci_big_sync_for_handle(big_handle) != NULL){
10511         return ERROR_CODE_ACL_CONNECTION_ALREADY_EXISTS;
10512     }
10513     if (num_bis == 0){
10514         return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS;
10515     }
10516     if (num_bis > MAX_NR_BIS){
10517         return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS;
10518     }
10519 
10520     // reserve ISO Streams
10521     uint8_t i;
10522     uint8_t status = ERROR_CODE_SUCCESS;
10523     for (i=0;i<num_bis;i++){
10524         hci_iso_stream_t * iso_stream = hci_iso_stream_create(HCI_ISO_TYPE_BIS, HCI_ISO_STREAM_STATE_REQUESTED, big_handle, i);
10525         if (iso_stream == NULL) {
10526             status = ERROR_CODE_MEMORY_CAPACITY_EXCEEDED;
10527             break;
10528         }
10529     }
10530 
10531     // free structs on error
10532     if (status != ERROR_CODE_SUCCESS){
10533         hci_iso_stream_finalize_by_type_and_group_id(HCI_ISO_TYPE_BIS, big_handle);
10534     }
10535 
10536     return status;
10537 }
10538 
10539 uint8_t gap_big_create(le_audio_big_t * storage, le_audio_big_params_t * big_params){
10540     uint8_t status = gap_big_setup_iso_streams(big_params->num_bis, big_params->big_handle);
10541     if (status != ERROR_CODE_SUCCESS){
10542         return status;
10543     }
10544 
10545     le_audio_big_t * big = storage;
10546     big->big_handle = big_params->big_handle;
10547     big->params = big_params;
10548     big->state = LE_AUDIO_BIG_STATE_CREATE;
10549     big->num_bis = big_params->num_bis;
10550     btstack_linked_list_add(&hci_stack->le_audio_bigs, (btstack_linked_item_t *) big);
10551 
10552     hci_run();
10553 
10554     return ERROR_CODE_SUCCESS;
10555 }
10556 
10557 uint8_t gap_big_sync_create(le_audio_big_sync_t * storage, le_audio_big_sync_params_t * big_sync_params){
10558     uint8_t status = gap_big_setup_iso_streams(big_sync_params->num_bis, big_sync_params->big_handle);
10559     if (status != ERROR_CODE_SUCCESS){
10560         return status;
10561     }
10562 
10563     le_audio_big_sync_t * big_sync = storage;
10564     big_sync->big_handle = big_sync_params->big_handle;
10565     big_sync->params = big_sync_params;
10566     big_sync->state = LE_AUDIO_BIG_STATE_CREATE;
10567     big_sync->num_bis = big_sync_params->num_bis;
10568     btstack_linked_list_add(&hci_stack->le_audio_big_syncs, (btstack_linked_item_t *) big_sync);
10569 
10570     hci_run();
10571 
10572     return ERROR_CODE_SUCCESS;
10573 }
10574 
10575 uint8_t gap_big_terminate(uint8_t big_handle){
10576     le_audio_big_t * big = hci_big_for_handle(big_handle);
10577     if (big == NULL){
10578         return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
10579     }
10580     switch (big->state){
10581         case LE_AUDIO_BIG_STATE_CREATE:
10582             btstack_linked_list_remove(&hci_stack->le_audio_bigs, (btstack_linked_item_t *) big);
10583             hci_emit_big_terminated(big);
10584             break;
10585         case LE_AUDIO_BIG_STATE_W4_SETUP_ISO_PATH:
10586             big->state = LE_AUDIO_BIG_STATE_W4_SETUP_ISO_PATH_THEN_TERMINATE;
10587             break;
10588         case LE_AUDIO_BIG_STATE_W4_ESTABLISHED:
10589         case LE_AUDIO_BIG_STATE_SETUP_ISO_PATH:
10590         case LE_AUDIO_BIG_STATE_ACTIVE:
10591             big->state = LE_AUDIO_BIG_STATE_TERMINATE;
10592             hci_run();
10593             break;
10594         default:
10595             return ERROR_CODE_COMMAND_DISALLOWED;
10596     }
10597     return ERROR_CODE_SUCCESS;
10598 }
10599 
10600 uint8_t gap_big_sync_terminate(uint8_t big_handle){
10601     le_audio_big_sync_t * big_sync = hci_big_sync_for_handle(big_handle);
10602     if (big_sync == NULL){
10603         return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
10604     }
10605     switch (big_sync->state){
10606         case LE_AUDIO_BIG_STATE_CREATE:
10607             btstack_linked_list_remove(&hci_stack->le_audio_big_syncs, (btstack_linked_item_t *) big_sync);
10608             hci_emit_big_sync_stopped(big_handle);
10609             break;
10610         case LE_AUDIO_BIG_STATE_W4_SETUP_ISO_PATH:
10611             big_sync->state = LE_AUDIO_BIG_STATE_W4_SETUP_ISO_PATH_THEN_TERMINATE;
10612             break;
10613         case LE_AUDIO_BIG_STATE_W4_ESTABLISHED:
10614         case LE_AUDIO_BIG_STATE_SETUP_ISO_PATH:
10615         case LE_AUDIO_BIG_STATE_ACTIVE:
10616             big_sync->state = LE_AUDIO_BIG_STATE_TERMINATE;
10617             hci_run();
10618             break;
10619         default:
10620             return ERROR_CODE_COMMAND_DISALLOWED;
10621     }
10622     return ERROR_CODE_SUCCESS;
10623 }
10624 
10625 uint8_t hci_request_bis_can_send_now_events(uint8_t big_handle){
10626     le_audio_big_t * big = hci_big_for_handle(big_handle);
10627     if (big == NULL){
10628         return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
10629     }
10630     if (big->state != LE_AUDIO_BIG_STATE_ACTIVE){
10631         return ERROR_CODE_COMMAND_DISALLOWED;
10632     }
10633     big->can_send_now_requested = true;
10634     hci_iso_notify_can_send_now();
10635     return ERROR_CODE_SUCCESS;
10636 }
10637 
10638 uint8_t hci_request_cis_can_send_now_events(hci_con_handle_t cis_con_handle){
10639     hci_iso_stream_t * iso_stream = hci_iso_stream_for_con_handle(cis_con_handle);
10640     if (iso_stream == NULL){
10641         return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
10642     }
10643     if ((iso_stream->iso_type != HCI_ISO_TYPE_CIS) && (iso_stream->state != HCI_ISO_STREAM_STATE_ESTABLISHED)) {
10644         return ERROR_CODE_COMMAND_DISALLOWED;
10645     }
10646     iso_stream->can_send_now_requested = true;
10647     hci_iso_notify_can_send_now();
10648     return ERROR_CODE_SUCCESS;
10649 }
10650 
10651 uint8_t gap_cig_create(le_audio_cig_t * storage, le_audio_cig_params_t * cig_params){
10652     if (hci_cig_for_id(cig_params->cig_id) != NULL){
10653         return ERROR_CODE_ACL_CONNECTION_ALREADY_EXISTS;
10654     }
10655     if (cig_params->num_cis == 0){
10656         return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS;
10657     }
10658     if (cig_params->num_cis > MAX_NR_CIS){
10659         return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS;
10660     }
10661 
10662     // reserve ISO Streams
10663     uint8_t i;
10664     uint8_t status = ERROR_CODE_SUCCESS;
10665     for (i=0;i<cig_params->num_cis;i++){
10666         hci_iso_stream_t * iso_stream = hci_iso_stream_create(HCI_ISO_TYPE_CIS,HCI_ISO_STREAM_STATE_REQUESTED, cig_params->cig_id, i);
10667         if (iso_stream == NULL) {
10668             status = ERROR_CODE_MEMORY_CAPACITY_EXCEEDED;
10669             break;
10670         }
10671     }
10672 
10673     // free structs on error
10674     if (status != ERROR_CODE_SUCCESS){
10675         hci_iso_stream_finalize_by_type_and_group_id(HCI_ISO_TYPE_CIS, cig_params->cig_id);
10676         return status;
10677     }
10678 
10679     le_audio_cig_t * cig = storage;
10680     cig->cig_id = cig_params->cig_id;
10681     cig->num_cis = cig_params->num_cis;
10682     cig->params = cig_params;
10683     cig->state = LE_AUDIO_CIG_STATE_CREATE;
10684     for (i=0;i<cig->num_cis;i++){
10685         cig->cis_con_handles[i] = HCI_CON_HANDLE_INVALID;
10686         cig->acl_con_handles[i] = HCI_CON_HANDLE_INVALID;
10687         cig->cis_setup_active[i] = false;
10688         cig->cis_established[i] = false;
10689     }
10690     btstack_linked_list_add(&hci_stack->le_audio_cigs, (btstack_linked_item_t *) cig);
10691 
10692     hci_run();
10693 
10694     return ERROR_CODE_SUCCESS;
10695 }
10696 
10697 uint8_t gap_cig_remove(uint8_t cig_id){
10698     le_audio_cig_t * cig = hci_cig_for_id(cig_id);
10699     if (cig == NULL){
10700         return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
10701     }
10702 
10703     // close active CIS
10704     uint8_t i;
10705     for (i=0;i<cig->num_cis;i++){
10706         hci_iso_stream_t * stream = hci_iso_stream_for_con_handle(cig->cis_con_handles[i]);
10707         if (stream != NULL){
10708             stream->state = HCI_ISO_STREAM_STATE_W2_CLOSE;
10709         }
10710     }
10711     cig->state = LE_AUDIO_CIG_STATE_REMOVE;
10712 
10713     hci_run();
10714 
10715     return ERROR_CODE_SUCCESS;
10716 }
10717 
10718 uint8_t gap_cis_create(uint8_t cig_id, hci_con_handle_t cis_con_handles [], hci_con_handle_t acl_con_handles []){
10719     le_audio_cig_t * cig = hci_cig_for_id(cig_id);
10720     if (cig == NULL){
10721         return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
10722     }
10723 
10724     if (cig->state != LE_AUDIO_CIG_STATE_W4_CIS_REQUEST){
10725         return ERROR_CODE_COMMAND_DISALLOWED;
10726     }
10727 
10728     // store ACL Connection Handles
10729     uint8_t i;
10730     for (i=0;i<cig->num_cis;i++){
10731         // check that all con handles exist and store
10732         hci_con_handle_t cis_handle = cis_con_handles[i];
10733         if (cis_handle == HCI_CON_HANDLE_INVALID){
10734             return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
10735         }
10736         uint8_t j;
10737         bool found = false;
10738         for (j=0;j<cig->num_cis;j++){
10739             if (cig->cis_con_handles[j] == cis_handle){
10740                 cig->acl_con_handles[j] = acl_con_handles[j];
10741                 hci_iso_stream_t * iso_stream = hci_iso_stream_for_con_handle(cis_handle);
10742                 btstack_assert(iso_stream != NULL);
10743                 iso_stream->acl_handle = acl_con_handles[j];
10744                 found = true;
10745                 break;
10746             }
10747         }
10748         if (!found){
10749             return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
10750         }
10751     }
10752 
10753     cig->state = LE_AUDIO_CIG_STATE_CREATE_CIS;
10754     hci_run();
10755 
10756     return ERROR_CODE_SUCCESS;
10757 }
10758 
10759 static uint8_t hci_cis_accept_or_reject(hci_con_handle_t cis_handle, hci_iso_stream_state_t state){
10760     hci_iso_stream_t * iso_stream = hci_iso_stream_for_con_handle(cis_handle);
10761     if (iso_stream == NULL){
10762         // if we got a CIS Request but fail to allocate a hci_iso_stream_t object, we won't find it here
10763         return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED;
10764     }
10765 
10766     // set next state and continue
10767     iso_stream->state = state;
10768     hci_run();
10769     return ERROR_CODE_SUCCESS;
10770 }
10771 
10772 uint8_t gap_cis_accept(hci_con_handle_t cis_con_handle){
10773     return hci_cis_accept_or_reject(cis_con_handle, HCI_ISO_STREAM_W2_ACCEPT);
10774 }
10775 
10776 uint8_t gap_cis_reject(hci_con_handle_t cis_con_handle){
10777     return hci_cis_accept_or_reject(cis_con_handle, HCI_ISO_STREAM_W2_REJECT);
10778 }
10779 
10780 #endif /* ENABLE_LE_ISOCHRONOUS_STREAMS */
10781 
10782 // GAP Privacy - notify clients before random address update
10783 
10784 static bool gap_privacy_client_all_ready(void){
10785     // check if all ready
10786     btstack_linked_list_iterator_t it;
10787     btstack_linked_list_iterator_init(&it, &hci_stack->gap_privacy_clients);
10788     while (btstack_linked_list_iterator_has_next(&it)) {
10789         gap_privacy_client_t *client = (gap_privacy_client_t *) btstack_linked_list_iterator_next(&it);
10790         if (client->state != GAP_PRIVACY_CLIENT_STATE_READY){
10791             return false;
10792         }
10793     }
10794     return true;
10795 }
10796 
10797 static void gap_privacy_clients_handle_ready(void){
10798     // clear 'ready'
10799     btstack_linked_list_iterator_t it;
10800     btstack_linked_list_iterator_init(&it, &hci_stack->gap_privacy_clients);
10801     while (btstack_linked_list_iterator_has_next(&it)) {
10802         gap_privacy_client_t *client = (gap_privacy_client_t *) btstack_linked_list_iterator_next(&it);
10803         client->state = GAP_PRIVACY_CLIENT_STATE_IDLE;
10804     }
10805     hci_stack->le_advertisements_state &= ~LE_ADVERTISEMENT_STATE_PRIVACY_PENDING;
10806     hci_run();
10807 }
10808 
10809 static void gap_privacy_clients_notify(bd_addr_t new_random_address){
10810     btstack_linked_list_iterator_t it;
10811     btstack_linked_list_iterator_init(&it, &hci_stack->gap_privacy_clients);
10812     while (btstack_linked_list_iterator_has_next(&it)) {
10813         gap_privacy_client_t *client = (gap_privacy_client_t *) btstack_linked_list_iterator_next(&it);
10814         if (client->state == GAP_PRIVACY_CLIENT_STATE_IDLE){
10815             client->state = GAP_PRIVACY_CLIENT_STATE_PENDING;
10816             (*client->callback)(client, new_random_address);
10817         }
10818     }
10819     if (gap_privacy_client_all_ready()){
10820         gap_privacy_clients_handle_ready();
10821     }
10822 }
10823 
10824 void gap_privacy_client_register(gap_privacy_client_t * client){
10825     client->state = GAP_PRIVACY_CLIENT_STATE_IDLE;
10826     btstack_linked_list_add(&hci_stack->gap_privacy_clients, (btstack_linked_item_t *) client);
10827 }
10828 
10829 void gap_privacy_client_ready(gap_privacy_client_t * client){
10830     client->state = GAP_PRIVACY_CLIENT_STATE_READY;
10831     if (gap_privacy_client_all_ready()){
10832         gap_privacy_clients_handle_ready();
10833     }
10834 }
10835 
10836 void gap_privacy_client_unregister(gap_privacy_client_t * client){
10837     btstack_linked_list_remove(&hci_stack->gap_privacy_clients, (btstack_linked_item_t *) client);
10838 }
10839 
10840 #endif /* ENABLE_BLE */
10841 
10842 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
10843 void hci_setup_test_connections_fuzz(void){
10844     hci_connection_t * conn;
10845 
10846     // default address: 66:55:44:33:00:01
10847     bd_addr_t addr = { 0x66, 0x55, 0x44, 0x33, 0x00, 0x00};
10848 
10849     // setup Controller info
10850     hci_stack->num_cmd_packets = 255;
10851     hci_stack->acl_packets_total_num = 255;
10852 
10853     // setup incoming Classic ACL connection with con handle 0x0001, 66:55:44:33:22:01
10854     addr[5] = 0x01;
10855     conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL, HCI_ROLE_SLAVE);
10856     conn->con_handle = addr[5];
10857     conn->state = RECEIVED_CONNECTION_REQUEST;
10858     conn->sm_connection.sm_role = HCI_ROLE_SLAVE;
10859 
10860     // setup incoming Classic SCO connection with con handle 0x0002
10861     addr[5] = 0x02;
10862     conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_SCO, HCI_ROLE_SLAVE);
10863     conn->con_handle = addr[5];
10864     conn->state = RECEIVED_CONNECTION_REQUEST;
10865     conn->sm_connection.sm_role = HCI_ROLE_SLAVE;
10866 
10867     // setup ready Classic ACL connection with con handle 0x0003
10868     addr[5] = 0x03;
10869     conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL, HCI_ROLE_SLAVE);
10870     conn->con_handle = addr[5];
10871     conn->state = OPEN;
10872     conn->sm_connection.sm_role = HCI_ROLE_SLAVE;
10873 
10874     // setup ready Classic SCO connection with con handle 0x0004
10875     addr[5] = 0x04;
10876     conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_SCO, HCI_ROLE_SLAVE);
10877     conn->con_handle = addr[5];
10878     conn->state = OPEN;
10879     conn->sm_connection.sm_role = HCI_ROLE_SLAVE;
10880 
10881     // setup ready LE ACL connection with con handle 0x005 and public address
10882     addr[5] = 0x05;
10883     conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_LE_PUBLIC, HCI_ROLE_SLAVE);
10884     conn->con_handle = addr[5];
10885     conn->state = OPEN;
10886     conn->sm_connection.sm_role = HCI_ROLE_SLAVE;
10887     conn->sm_connection.sm_connection_encrypted = 1;
10888 }
10889 
10890 void hci_free_connections_fuzz(void){
10891     btstack_linked_list_iterator_t it;
10892     btstack_linked_list_iterator_init(&it, &hci_stack->connections);
10893     while (btstack_linked_list_iterator_has_next(&it)){
10894         hci_connection_t * con = (hci_connection_t*) btstack_linked_list_iterator_next(&it);
10895         btstack_linked_list_iterator_remove(&it);
10896         btstack_memory_hci_connection_free(con);
10897     }
10898 }
10899 void hci_simulate_working_fuzz(void){
10900     hci_stack->le_scanning_param_update = false;
10901     hci_init_done();
10902     hci_stack->num_cmd_packets = 255;
10903 }
10904 #endif
10905