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 MATTHIAS 24 * RINGWALD 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__ "gatt_client.c" 39 40 #include <stdint.h> 41 #include <string.h> 42 43 #include "btstack_config.h" 44 45 #include "att_dispatch.h" 46 #include "ad_parser.h" 47 #include "ble/att_db.h" 48 #include "ble/core.h" 49 #include "ble/gatt_client.h" 50 #include "ble/le_device_db.h" 51 #include "ble/sm.h" 52 #include "btstack_debug.h" 53 #include "btstack_event.h" 54 #include "btstack_memory.h" 55 #include "btstack_run_loop.h" 56 #include "btstack_util.h" 57 #include "classic/sdp_util.h" 58 #include "hci.h" 59 #include "hci_cmd.h" 60 #include "hci_dump.h" 61 #include "l2cap.h" 62 63 static btstack_linked_list_t gatt_client_connections; 64 static btstack_linked_list_t gatt_client_value_listeners; 65 static btstack_packet_callback_registration_t hci_event_callback_registration; 66 67 #if defined(ENABLE_GATT_CLIENT_PAIRING) || defined (ENABLE_LE_SIGNED_WRITE) || defined (ENABLE_LE_PROACTIVE_AUTHENTICATION) 68 static btstack_packet_callback_registration_t sm_event_callback_registration; 69 #endif 70 71 static uint8_t mtu_exchange_enabled; 72 73 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size); 74 static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 75 static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code); 76 77 #ifdef ENABLE_LE_SIGNED_WRITE 78 static void att_signed_write_handle_cmac_result(uint8_t hash[8]); 79 #endif 80 81 void gatt_client_init(void){ 82 gatt_client_connections = NULL; 83 mtu_exchange_enabled = 1; 84 85 // regsister for HCI Events 86 hci_event_callback_registration.callback = &gatt_client_event_packet_handler; 87 hci_add_event_handler(&hci_event_callback_registration); 88 89 #if defined(ENABLE_GATT_CLIENT_PAIRING) || defined (ENABLE_LE_SIGNED_WRITE) || defined (ENABLE_LE_PROACTIVE_AUTHENTICATION) 90 // register for SM Events 91 sm_event_callback_registration.callback = &gatt_client_event_packet_handler; 92 sm_add_event_handler(&sm_event_callback_registration); 93 #endif 94 95 // and ATT Client PDUs 96 att_dispatch_register_client(gatt_client_att_packet_handler); 97 } 98 99 static gatt_client_t * gatt_client_for_timer(btstack_timer_source_t * ts){ 100 btstack_linked_list_iterator_t it; 101 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 102 while (btstack_linked_list_iterator_has_next(&it)){ 103 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 104 if (&gatt_client->gc_timeout == ts) { 105 return gatt_client; 106 } 107 } 108 return NULL; 109 } 110 111 static void gatt_client_timeout_handler(btstack_timer_source_t * timer){ 112 gatt_client_t * gatt_client = gatt_client_for_timer(timer); 113 if (gatt_client == NULL) return; 114 log_info("GATT client timeout handle, handle 0x%02x", gatt_client->con_handle); 115 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_TIMEOUT); 116 } 117 118 static void gatt_client_timeout_start(gatt_client_t * gatt_client){ 119 log_info("GATT client timeout start, handle 0x%02x", gatt_client->con_handle); 120 btstack_run_loop_remove_timer(&gatt_client->gc_timeout); 121 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_timeout_handler); 122 btstack_run_loop_set_timer(&gatt_client->gc_timeout, 30000); // 30 seconds sm timeout 123 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 124 } 125 126 static void gatt_client_timeout_stop(gatt_client_t * gatt_client){ 127 log_info("GATT client timeout stop, handle 0x%02x", gatt_client->con_handle); 128 btstack_run_loop_remove_timer(&gatt_client->gc_timeout); 129 } 130 131 static gatt_client_t * gatt_client_get_context_for_handle(uint16_t handle){ 132 btstack_linked_item_t *it; 133 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 134 gatt_client_t * gatt_client = (gatt_client_t *) it; 135 if (gatt_client->con_handle == handle){ 136 return gatt_client; 137 } 138 } 139 return NULL; 140 } 141 142 143 // @returns gatt_client context 144 // returns existing one, or tries to setup new one 145 static gatt_client_t * gatt_client_provide_context_for_handle(hci_con_handle_t con_handle){ 146 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 147 if (gatt_client) return gatt_client; 148 149 // bail if no such hci connection 150 if (!hci_connection_for_handle(con_handle)){ 151 log_error("No connection for handle 0x%04x", con_handle); 152 return NULL; 153 } 154 gatt_client = btstack_memory_gatt_client_get(); 155 if (!gatt_client) return NULL; 156 // init state 157 gatt_client->con_handle = con_handle; 158 gatt_client->mtu = ATT_DEFAULT_MTU; 159 if (mtu_exchange_enabled){ 160 gatt_client->mtu_state = SEND_MTU_EXCHANGE; 161 } else { 162 gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 163 } 164 gatt_client->gatt_client_state = P_READY; 165 btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); 166 return gatt_client; 167 } 168 169 static gatt_client_t * gatt_client_provide_context_for_handle_and_start_timer(hci_con_handle_t con_handle){ 170 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle(con_handle); 171 if (gatt_client == NULL) return NULL; 172 gatt_client_timeout_start(gatt_client); 173 return gatt_client; 174 } 175 176 static int is_ready(gatt_client_t * gatt_client){ 177 return gatt_client->gatt_client_state == P_READY; 178 } 179 180 int gatt_client_is_ready(hci_con_handle_t con_handle){ 181 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle(con_handle); 182 if (gatt_client == NULL) return 0; 183 return is_ready(gatt_client); 184 } 185 186 void gatt_client_mtu_enable_auto_negotiation(uint8_t enabled){ 187 mtu_exchange_enabled = enabled; 188 } 189 190 uint8_t gatt_client_get_mtu(hci_con_handle_t con_handle, uint16_t * mtu){ 191 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle(con_handle); 192 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 193 194 if ((gatt_client->mtu_state == MTU_EXCHANGED) || (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED)){ 195 *mtu = gatt_client->mtu; 196 return ERROR_CODE_SUCCESS; 197 } 198 *mtu = ATT_DEFAULT_MTU; 199 return GATT_CLIENT_IN_WRONG_STATE; 200 } 201 202 // precondition: can_send_packet_now == TRUE 203 static uint8_t att_confirmation(uint16_t con_handle){ 204 l2cap_reserve_packet_buffer(); 205 uint8_t * request = l2cap_get_outgoing_buffer(); 206 request[0] = ATT_HANDLE_VALUE_CONFIRMATION; 207 208 return l2cap_send_prepared_connectionless(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 1); 209 } 210 211 // precondition: can_send_packet_now == TRUE 212 static uint8_t att_find_information_request(uint16_t request_type, uint16_t con_handle, uint16_t start_handle, uint16_t end_handle){ 213 l2cap_reserve_packet_buffer(); 214 uint8_t * request = l2cap_get_outgoing_buffer(); 215 request[0] = request_type; 216 little_endian_store_16(request, 1, start_handle); 217 little_endian_store_16(request, 3, end_handle); 218 219 return l2cap_send_prepared_connectionless(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 5); 220 } 221 222 // precondition: can_send_packet_now == TRUE 223 static uint8_t att_find_by_type_value_request(uint16_t request_type, uint16_t attribute_group_type, uint16_t con_handle, uint16_t start_handle, uint16_t end_handle, uint8_t * value, uint16_t value_size){ 224 l2cap_reserve_packet_buffer(); 225 uint8_t * request = l2cap_get_outgoing_buffer(); 226 227 request[0] = request_type; 228 little_endian_store_16(request, 1, start_handle); 229 little_endian_store_16(request, 3, end_handle); 230 little_endian_store_16(request, 5, attribute_group_type); 231 (void)memcpy(&request[7], value, value_size); 232 233 return l2cap_send_prepared_connectionless(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 7u + value_size); 234 } 235 236 // precondition: can_send_packet_now == TRUE 237 static uint8_t att_read_by_type_or_group_request_for_uuid16(uint16_t request_type, uint16_t uuid16, uint16_t con_handle, uint16_t start_handle, uint16_t end_handle){ 238 l2cap_reserve_packet_buffer(); 239 uint8_t * request = l2cap_get_outgoing_buffer(); 240 request[0] = request_type; 241 little_endian_store_16(request, 1, start_handle); 242 little_endian_store_16(request, 3, end_handle); 243 little_endian_store_16(request, 5, uuid16); 244 245 return l2cap_send_prepared_connectionless(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 7); 246 } 247 248 // precondition: can_send_packet_now == TRUE 249 static uint8_t att_read_by_type_or_group_request_for_uuid128(uint16_t request_type, uint8_t * uuid128, uint16_t con_handle, uint16_t start_handle, uint16_t end_handle){ 250 l2cap_reserve_packet_buffer(); 251 uint8_t * request = l2cap_get_outgoing_buffer(); 252 request[0] = request_type; 253 little_endian_store_16(request, 1, start_handle); 254 little_endian_store_16(request, 3, end_handle); 255 reverse_128(uuid128, &request[5]); 256 257 return l2cap_send_prepared_connectionless(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 21); 258 } 259 260 // precondition: can_send_packet_now == TRUE 261 static uint8_t att_read_request(uint16_t request_type, uint16_t con_handle, uint16_t attribute_handle){ 262 l2cap_reserve_packet_buffer(); 263 uint8_t * request = l2cap_get_outgoing_buffer(); 264 request[0] = request_type; 265 little_endian_store_16(request, 1, attribute_handle); 266 267 return l2cap_send_prepared_connectionless(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 3); 268 } 269 270 // precondition: can_send_packet_now == TRUE 271 static uint8_t att_read_blob_request(uint16_t request_type, uint16_t con_handle, uint16_t attribute_handle, uint16_t value_offset){ 272 l2cap_reserve_packet_buffer(); 273 uint8_t * request = l2cap_get_outgoing_buffer(); 274 request[0] = request_type; 275 little_endian_store_16(request, 1, attribute_handle); 276 little_endian_store_16(request, 3, value_offset); 277 278 return l2cap_send_prepared_connectionless(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 5); 279 } 280 281 static uint8_t att_read_multiple_request(uint16_t con_handle, uint16_t num_value_handles, uint16_t * value_handles){ 282 l2cap_reserve_packet_buffer(); 283 uint8_t * request = l2cap_get_outgoing_buffer(); 284 request[0] = ATT_READ_MULTIPLE_REQUEST; 285 int i; 286 int offset = 1; 287 for (i=0;i<num_value_handles;i++){ 288 little_endian_store_16(request, offset, value_handles[i]); 289 offset += 2; 290 } 291 292 return l2cap_send_prepared_connectionless(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, offset); 293 } 294 295 #ifdef ENABLE_LE_SIGNED_WRITE 296 // precondition: can_send_packet_now == TRUE 297 static uint8_t att_signed_write_request(uint16_t request_type, uint16_t con_handle, uint16_t attribute_handle, uint16_t value_length, uint8_t * value, uint32_t sign_counter, uint8_t sgn[8]){ 298 l2cap_reserve_packet_buffer(); 299 uint8_t * request = l2cap_get_outgoing_buffer(); 300 request[0] = request_type; 301 little_endian_store_16(request, 1, attribute_handle); 302 (void)memcpy(&request[3], value, value_length); 303 little_endian_store_32(request, 3 + value_length, sign_counter); 304 reverse_64(sgn, &request[3 + value_length + 4]); 305 306 return l2cap_send_prepared_connectionless(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 3 + value_length + 12); 307 } 308 #endif 309 310 // precondition: can_send_packet_now == TRUE 311 static uint8_t att_write_request(uint16_t request_type, uint16_t con_handle, uint16_t attribute_handle, uint16_t value_length, uint8_t * value){ 312 l2cap_reserve_packet_buffer(); 313 uint8_t * request = l2cap_get_outgoing_buffer(); 314 request[0] = request_type; 315 little_endian_store_16(request, 1, attribute_handle); 316 (void)memcpy(&request[3], value, value_length); 317 318 return l2cap_send_prepared_connectionless(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 3u + value_length); 319 } 320 321 // precondition: can_send_packet_now == TRUE 322 static uint8_t att_execute_write_request(uint16_t request_type, uint16_t con_handle, uint8_t execute_write){ 323 l2cap_reserve_packet_buffer(); 324 uint8_t * request = l2cap_get_outgoing_buffer(); 325 request[0] = request_type; 326 request[1] = execute_write; 327 328 return l2cap_send_prepared_connectionless(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 2); 329 } 330 331 // precondition: can_send_packet_now == TRUE 332 static uint8_t att_prepare_write_request(uint16_t request_type, uint16_t con_handle, uint16_t attribute_handle, uint16_t value_offset, uint16_t blob_length, uint8_t * value){ 333 l2cap_reserve_packet_buffer(); 334 uint8_t * request = l2cap_get_outgoing_buffer(); 335 request[0] = request_type; 336 little_endian_store_16(request, 1, attribute_handle); 337 little_endian_store_16(request, 3, value_offset); 338 (void)memcpy(&request[5], &value[value_offset], blob_length); 339 340 return l2cap_send_prepared_connectionless(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 5u + blob_length); 341 } 342 343 static uint8_t att_exchange_mtu_request(uint16_t con_handle){ 344 uint16_t mtu = l2cap_max_le_mtu(); 345 l2cap_reserve_packet_buffer(); 346 uint8_t * request = l2cap_get_outgoing_buffer(); 347 request[0] = ATT_EXCHANGE_MTU_REQUEST; 348 little_endian_store_16(request, 1, mtu); 349 350 return l2cap_send_prepared_connectionless(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 3); 351 } 352 353 static uint16_t write_blob_length(gatt_client_t * gatt_client){ 354 uint16_t max_blob_length = gatt_client->mtu - 5u; 355 if (gatt_client->attribute_offset >= gatt_client->attribute_length) { 356 return 0; 357 } 358 uint16_t rest_length = gatt_client->attribute_length - gatt_client->attribute_offset; 359 if (max_blob_length > rest_length){ 360 return rest_length; 361 } 362 return max_blob_length; 363 } 364 365 static void send_gatt_services_request(gatt_client_t *gatt_client){ 366 att_read_by_type_or_group_request_for_uuid16(ATT_READ_BY_GROUP_TYPE_REQUEST, GATT_PRIMARY_SERVICE_UUID, gatt_client->con_handle, gatt_client->start_group_handle, gatt_client->end_group_handle); 367 } 368 369 static void send_gatt_by_uuid_request(gatt_client_t *gatt_client, uint16_t attribute_group_type){ 370 if (gatt_client->uuid16){ 371 uint8_t uuid16[2]; 372 little_endian_store_16(uuid16, 0, gatt_client->uuid16); 373 att_find_by_type_value_request(ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, gatt_client->con_handle, gatt_client->start_group_handle, gatt_client->end_group_handle, uuid16, 2); 374 return; 375 } 376 uint8_t uuid128[16]; 377 reverse_128(gatt_client->uuid128, uuid128); 378 att_find_by_type_value_request(ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, gatt_client->con_handle, gatt_client->start_group_handle, gatt_client->end_group_handle, uuid128, 16); 379 } 380 381 static void send_gatt_services_by_uuid_request(gatt_client_t *gatt_client){ 382 send_gatt_by_uuid_request(gatt_client, GATT_PRIMARY_SERVICE_UUID); 383 } 384 385 static void send_gatt_included_service_uuid_request(gatt_client_t *gatt_client){ 386 att_read_request(ATT_READ_REQUEST, gatt_client->con_handle, gatt_client->query_start_handle); 387 } 388 389 static void send_gatt_included_service_request(gatt_client_t *gatt_client){ 390 att_read_by_type_or_group_request_for_uuid16(ATT_READ_BY_TYPE_REQUEST, GATT_INCLUDE_SERVICE_UUID, gatt_client->con_handle, gatt_client->start_group_handle, gatt_client->end_group_handle); 391 } 392 393 static void send_gatt_characteristic_request(gatt_client_t *gatt_client){ 394 att_read_by_type_or_group_request_for_uuid16(ATT_READ_BY_TYPE_REQUEST, GATT_CHARACTERISTICS_UUID, gatt_client->con_handle, gatt_client->start_group_handle, gatt_client->end_group_handle); 395 } 396 397 static void send_gatt_characteristic_descriptor_request(gatt_client_t *gatt_client){ 398 att_find_information_request(ATT_FIND_INFORMATION_REQUEST, gatt_client->con_handle, gatt_client->start_group_handle, gatt_client->end_group_handle); 399 } 400 401 static void send_gatt_read_characteristic_value_request(gatt_client_t *gatt_client){ 402 att_read_request(ATT_READ_REQUEST, gatt_client->con_handle, gatt_client->attribute_handle); 403 } 404 405 static void send_gatt_read_by_type_request(gatt_client_t * gatt_client){ 406 if (gatt_client->uuid16){ 407 att_read_by_type_or_group_request_for_uuid16(ATT_READ_BY_TYPE_REQUEST, gatt_client->uuid16, gatt_client->con_handle, gatt_client->start_group_handle, gatt_client->end_group_handle); 408 } else { 409 att_read_by_type_or_group_request_for_uuid128(ATT_READ_BY_TYPE_REQUEST, gatt_client->uuid128, gatt_client->con_handle, gatt_client->start_group_handle, gatt_client->end_group_handle); 410 } 411 } 412 413 static void send_gatt_read_blob_request(gatt_client_t *gatt_client){ 414 att_read_blob_request(ATT_READ_BLOB_REQUEST, gatt_client->con_handle, gatt_client->attribute_handle, gatt_client->attribute_offset); 415 } 416 417 static void send_gatt_read_multiple_request(gatt_client_t * gatt_client){ 418 att_read_multiple_request(gatt_client->con_handle, gatt_client->read_multiple_handle_count, gatt_client->read_multiple_handles); 419 } 420 421 static void send_gatt_write_attribute_value_request(gatt_client_t * gatt_client){ 422 att_write_request(ATT_WRITE_REQUEST, gatt_client->con_handle, gatt_client->attribute_handle, gatt_client->attribute_length, gatt_client->attribute_value); 423 } 424 425 static void send_gatt_write_client_characteristic_configuration_request(gatt_client_t * gatt_client){ 426 att_write_request(ATT_WRITE_REQUEST, gatt_client->con_handle, gatt_client->client_characteristic_configuration_handle, 2, gatt_client->client_characteristic_configuration_value); 427 } 428 429 static void send_gatt_prepare_write_request(gatt_client_t * gatt_client){ 430 att_prepare_write_request(ATT_PREPARE_WRITE_REQUEST, gatt_client->con_handle, gatt_client->attribute_handle, gatt_client->attribute_offset, write_blob_length(gatt_client), gatt_client->attribute_value); 431 } 432 433 static void send_gatt_execute_write_request(gatt_client_t * gatt_client){ 434 att_execute_write_request(ATT_EXECUTE_WRITE_REQUEST, gatt_client->con_handle, 1); 435 } 436 437 static void send_gatt_cancel_prepared_write_request(gatt_client_t * gatt_client){ 438 att_execute_write_request(ATT_EXECUTE_WRITE_REQUEST, gatt_client->con_handle, 0); 439 } 440 441 #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 442 static void send_gatt_read_client_characteristic_configuration_request(gatt_client_t * gatt_client){ 443 att_read_by_type_or_group_request_for_uuid16(ATT_READ_BY_TYPE_REQUEST, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION, gatt_client->con_handle, gatt_client->start_group_handle, gatt_client->end_group_handle); 444 } 445 #endif 446 447 static void send_gatt_read_characteristic_descriptor_request(gatt_client_t * gatt_client){ 448 att_read_request(ATT_READ_REQUEST, gatt_client->con_handle, gatt_client->attribute_handle); 449 } 450 451 #ifdef ENABLE_LE_SIGNED_WRITE 452 static void send_gatt_signed_write_request(gatt_client_t * gatt_client, uint32_t sign_counter){ 453 att_signed_write_request(ATT_SIGNED_WRITE_COMMAND, gatt_client->con_handle, gatt_client->attribute_handle, gatt_client->attribute_length, gatt_client->attribute_value, sign_counter, gatt_client->cmac); 454 } 455 #endif 456 457 static uint16_t get_last_result_handle_from_service_list(uint8_t * packet, uint16_t size){ 458 uint8_t attr_length = packet[1]; 459 return little_endian_read_16(packet, size - attr_length + 2u); 460 } 461 462 static uint16_t get_last_result_handle_from_characteristics_list(uint8_t * packet, uint16_t size){ 463 uint8_t attr_length = packet[1]; 464 return little_endian_read_16(packet, size - attr_length + 3u); 465 } 466 467 static uint16_t get_last_result_handle_from_included_services_list(uint8_t * packet, uint16_t size){ 468 uint8_t attr_length = packet[1]; 469 return little_endian_read_16(packet, size - attr_length); 470 } 471 472 static void gatt_client_handle_transaction_complete(gatt_client_t * gatt_client){ 473 gatt_client->gatt_client_state = P_READY; 474 gatt_client_timeout_stop(gatt_client); 475 } 476 477 static void emit_event_new(btstack_packet_handler_t callback, uint8_t * packet, uint16_t size){ 478 if (!callback) return; 479 hci_dump_packet(HCI_EVENT_PACKET, 0, packet, size); 480 (*callback)(HCI_EVENT_PACKET, 0, packet, size); 481 } 482 483 void gatt_client_listen_for_characteristic_value_updates(gatt_client_notification_t * notification, btstack_packet_handler_t packet_handler, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 484 notification->callback = packet_handler; 485 notification->con_handle = con_handle; 486 if (characteristic == NULL){ 487 notification->attribute_handle = GATT_CLIENT_ANY_VALUE_HANDLE; 488 } else { 489 notification->attribute_handle = characteristic->value_handle; 490 } 491 btstack_linked_list_add(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 492 } 493 494 void gatt_client_stop_listening_for_characteristic_value_updates(gatt_client_notification_t * notification){ 495 btstack_linked_list_remove(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 496 } 497 498 static void emit_event_to_registered_listeners(hci_con_handle_t con_handle, uint16_t attribute_handle, uint8_t * packet, uint16_t size){ 499 btstack_linked_list_iterator_t it; 500 btstack_linked_list_iterator_init(&it, &gatt_client_value_listeners); 501 while (btstack_linked_list_iterator_has_next(&it)){ 502 gatt_client_notification_t * notification = (gatt_client_notification_t*) btstack_linked_list_iterator_next(&it); 503 if ((notification->con_handle != GATT_CLIENT_ANY_CONNECTION) && (notification->con_handle != con_handle)) continue; 504 if ((notification->attribute_handle != GATT_CLIENT_ANY_VALUE_HANDLE) && (notification->attribute_handle != attribute_handle)) continue; 505 (*notification->callback)(HCI_EVENT_PACKET, 0, packet, size); 506 } 507 } 508 509 static void emit_gatt_complete_event(gatt_client_t * gatt_client, uint8_t att_status){ 510 // @format H1 511 uint8_t packet[5]; 512 packet[0] = GATT_EVENT_QUERY_COMPLETE; 513 packet[1] = 3; 514 little_endian_store_16(packet, 2, gatt_client->con_handle); 515 packet[4] = att_status; 516 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 517 } 518 519 static void emit_gatt_service_query_result_event(gatt_client_t * gatt_client, uint16_t start_group_handle, uint16_t end_group_handle, uint8_t * uuid128){ 520 // @format HX 521 uint8_t packet[24]; 522 packet[0] = GATT_EVENT_SERVICE_QUERY_RESULT; 523 packet[1] = sizeof(packet) - 2u; 524 little_endian_store_16(packet, 2, gatt_client->con_handle); 525 /// 526 little_endian_store_16(packet, 4, start_group_handle); 527 little_endian_store_16(packet, 6, end_group_handle); 528 reverse_128(uuid128, &packet[8]); 529 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 530 } 531 532 static void emit_gatt_included_service_query_result_event(gatt_client_t * gatt_client, uint16_t include_handle, uint16_t start_group_handle, uint16_t end_group_handle, uint8_t * uuid128){ 533 // @format HX 534 uint8_t packet[26]; 535 packet[0] = GATT_EVENT_INCLUDED_SERVICE_QUERY_RESULT; 536 packet[1] = sizeof(packet) - 2u; 537 little_endian_store_16(packet, 2, gatt_client->con_handle); 538 /// 539 little_endian_store_16(packet, 4, include_handle); 540 // 541 little_endian_store_16(packet, 6, start_group_handle); 542 little_endian_store_16(packet, 8, end_group_handle); 543 reverse_128(uuid128, &packet[10]); 544 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 545 } 546 547 static void emit_gatt_characteristic_query_result_event(gatt_client_t * gatt_client, uint16_t start_handle, uint16_t value_handle, uint16_t end_handle, 548 uint16_t properties, uint8_t * uuid128){ 549 // @format HY 550 uint8_t packet[28]; 551 packet[0] = GATT_EVENT_CHARACTERISTIC_QUERY_RESULT; 552 packet[1] = sizeof(packet) - 2u; 553 little_endian_store_16(packet, 2, gatt_client->con_handle); 554 /// 555 little_endian_store_16(packet, 4, start_handle); 556 little_endian_store_16(packet, 6, value_handle); 557 little_endian_store_16(packet, 8, end_handle); 558 little_endian_store_16(packet, 10, properties); 559 reverse_128(uuid128, &packet[12]); 560 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 561 } 562 563 static void emit_gatt_all_characteristic_descriptors_result_event( 564 gatt_client_t * gatt_client, uint16_t descriptor_handle, uint8_t * uuid128){ 565 // @format HZ 566 uint8_t packet[22]; 567 packet[0] = GATT_EVENT_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT; 568 packet[1] = sizeof(packet) - 2u; 569 little_endian_store_16(packet, 2, gatt_client->con_handle); 570 /// 571 little_endian_store_16(packet, 4, descriptor_handle); 572 reverse_128(uuid128, &packet[6]); 573 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 574 } 575 576 static void emit_gatt_mtu_exchanged_result_event(gatt_client_t * gatt_client, uint16_t new_mtu){ 577 // @format H2 578 uint8_t packet[6]; 579 packet[0] = GATT_EVENT_MTU; 580 packet[1] = sizeof(packet) - 2u; 581 little_endian_store_16(packet, 2, gatt_client->con_handle); 582 little_endian_store_16(packet, 4, new_mtu); 583 att_dispatch_client_mtu_exchanged(gatt_client->con_handle, new_mtu); 584 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 585 } 586 /// 587 static void report_gatt_services(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 588 uint8_t attr_length = packet[1]; 589 uint8_t uuid_length = attr_length - 4u; 590 591 int i; 592 for (i = 2; i < size; i += attr_length){ 593 uint16_t start_group_handle = little_endian_read_16(packet,i); 594 uint16_t end_group_handle = little_endian_read_16(packet,i+2); 595 uint8_t uuid128[16]; 596 uint16_t uuid16 = 0; 597 598 if (uuid_length == 2u){ 599 uuid16 = little_endian_read_16(packet, i+4); 600 uuid_add_bluetooth_prefix((uint8_t*) &uuid128, uuid16); 601 } else { 602 reverse_128(&packet[i+4], uuid128); 603 } 604 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, uuid128); 605 } 606 } 607 608 // helper 609 static void characteristic_start_found(gatt_client_t * gatt_client, uint16_t start_handle, uint8_t properties, uint16_t value_handle, uint8_t * uuid, uint16_t uuid_length){ 610 uint8_t uuid128[16]; 611 uint16_t uuid16 = 0; 612 if (uuid_length == 2u){ 613 uuid16 = little_endian_read_16(uuid, 0); 614 uuid_add_bluetooth_prefix((uint8_t*) uuid128, uuid16); 615 } else if (uuid_length == 16u){ 616 reverse_128(uuid, uuid128); 617 } else { 618 return; 619 } 620 621 if (gatt_client->filter_with_uuid && (memcmp(gatt_client->uuid128, uuid128, 16) != 0)) return; 622 623 gatt_client->characteristic_properties = properties; 624 gatt_client->characteristic_start_handle = start_handle; 625 gatt_client->attribute_handle = value_handle; 626 627 if (gatt_client->filter_with_uuid) return; 628 629 gatt_client->uuid16 = uuid16; 630 (void)memcpy(gatt_client->uuid128, uuid128, 16); 631 } 632 633 static void characteristic_end_found(gatt_client_t * gatt_client, uint16_t end_handle){ 634 // TODO: stop searching if filter and uuid found 635 636 if (!gatt_client->characteristic_start_handle) return; 637 638 emit_gatt_characteristic_query_result_event(gatt_client, gatt_client->characteristic_start_handle, gatt_client->attribute_handle, 639 end_handle, gatt_client->characteristic_properties, gatt_client->uuid128); 640 641 gatt_client->characteristic_start_handle = 0; 642 } 643 644 static void report_gatt_characteristics(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 645 if (size < 2u) return; 646 uint8_t attr_length = packet[1]; 647 if ((attr_length != 7u) && (attr_length != 21u)) return; 648 uint8_t uuid_length = attr_length - 5u; 649 int i; 650 for (i = 2u; (i + attr_length) <= size; i += attr_length){ 651 uint16_t start_handle = little_endian_read_16(packet, i); 652 uint8_t properties = packet[i+2]; 653 uint16_t value_handle = little_endian_read_16(packet, i+3); 654 characteristic_end_found(gatt_client, start_handle - 1u); 655 characteristic_start_found(gatt_client, start_handle, properties, value_handle, &packet[i + 5], uuid_length); 656 } 657 } 658 659 static void report_gatt_included_service_uuid16(gatt_client_t * gatt_client, uint16_t include_handle, uint16_t uuid16){ 660 uint8_t normalized_uuid128[16]; 661 uuid_add_bluetooth_prefix(normalized_uuid128, uuid16); 662 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 663 gatt_client->query_end_handle, normalized_uuid128); 664 } 665 666 static void report_gatt_included_service_uuid128(gatt_client_t * gatt_client, uint16_t include_handle, uint8_t *uuid128){ 667 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 668 gatt_client->query_end_handle, uuid128); 669 } 670 671 // @returns packet pointer 672 // @note assume that value is part of an l2cap buffer - overwrite HCI + L2CAP packet headers 673 static const int characteristic_value_event_header_size = 8; 674 static uint8_t * setup_characteristic_value_packet(uint8_t type, hci_con_handle_t con_handle, uint16_t attribute_handle, uint8_t * value, uint16_t length){ 675 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 676 // avoid using pre ATT headers. 677 return NULL; 678 #endif 679 // before the value inside the ATT PDU 680 uint8_t * packet = value - characteristic_value_event_header_size; 681 packet[0] = type; 682 packet[1] = characteristic_value_event_header_size - 2 + length; 683 little_endian_store_16(packet, 2, con_handle); 684 little_endian_store_16(packet, 4, attribute_handle); 685 little_endian_store_16(packet, 6, length); 686 return packet; 687 } 688 689 // @returns packet pointer 690 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 691 static const int long_characteristic_value_event_header_size = 10; 692 static uint8_t * setup_long_characteristic_value_packet(uint8_t type, hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint8_t * value, uint16_t length){ 693 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 694 // avoid using pre ATT headers. 695 return NULL; 696 #endif 697 #if defined(HCI_INCOMING_PRE_BUFFER_SIZE) && (HCI_INCOMING_PRE_BUFFER_SIZE >= 10 - 8) // L2CAP Header (4) - ACL Header (4) 698 // before the value inside the ATT PDU 699 uint8_t * packet = value - long_characteristic_value_event_header_size; 700 packet[0] = type; 701 packet[1] = long_characteristic_value_event_header_size - 2 + length; 702 little_endian_store_16(packet, 2, con_handle); 703 little_endian_store_16(packet, 4, attribute_handle); 704 little_endian_store_16(packet, 6, offset); 705 little_endian_store_16(packet, 8, length); 706 return packet; 707 #else 708 log_error("HCI_INCOMING_PRE_BUFFER_SIZE >= 2 required for long characteristic reads"); 709 return NULL; 710 #endif 711 } 712 713 // test if notification/indication should be delivered to application (BLESA) 714 static bool gatt_client_accept_server_message(hci_con_handle_t con_handle){ 715 #ifdef ENABLE_LE_PROACTIVE_AUTHENTICATION 716 // ignore messages until re-encryption is complete 717 if (gap_reconnect_security_setup_active(con_handle)) return false; 718 719 // after that ignore if bonded but not encrypted 720 return !gap_bonded(con_handle) || (gap_encryption_key_size(con_handle) > 0); 721 #else 722 return true; 723 #endif 724 } 725 726 727 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 728 static void report_gatt_notification(hci_con_handle_t con_handle, uint16_t value_handle, uint8_t * value, int length){ 729 if (!gatt_client_accept_server_message(con_handle)) return; 730 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_NOTIFICATION, con_handle, value_handle, value, length); 731 emit_event_to_registered_listeners(con_handle, value_handle, packet, characteristic_value_event_header_size + length); 732 } 733 734 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 735 static void report_gatt_indication(hci_con_handle_t con_handle, uint16_t value_handle, uint8_t * value, int length){ 736 if (!gatt_client_accept_server_message(con_handle)) return; 737 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_INDICATION, con_handle, value_handle, value, length); 738 emit_event_to_registered_listeners(con_handle, value_handle, packet, characteristic_value_event_header_size + length); 739 } 740 741 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 742 static void report_gatt_characteristic_value(gatt_client_t * gatt_client, uint16_t attribute_handle, uint8_t * value, uint16_t length){ 743 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT, gatt_client->con_handle, attribute_handle, value, length); 744 emit_event_new(gatt_client->callback, packet, characteristic_value_event_header_size + length); 745 } 746 747 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 748 static void report_gatt_long_characteristic_value_blob(gatt_client_t * gatt_client, uint16_t attribute_handle, uint8_t * blob, uint16_t blob_length, int value_offset){ 749 uint8_t * packet = setup_long_characteristic_value_packet(GATT_EVENT_LONG_CHARACTERISTIC_VALUE_QUERY_RESULT, gatt_client->con_handle, attribute_handle, value_offset, blob, blob_length); 750 if (!packet) return; 751 emit_event_new(gatt_client->callback, packet, blob_length + long_characteristic_value_event_header_size); 752 } 753 754 static void report_gatt_characteristic_descriptor(gatt_client_t * gatt_client, uint16_t descriptor_handle, uint8_t *value, uint16_t value_length, uint16_t value_offset){ 755 UNUSED(value_offset); 756 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, gatt_client->con_handle, descriptor_handle, value, value_length); 757 emit_event_new(gatt_client->callback, packet, value_length + 8u); 758 } 759 760 static void report_gatt_long_characteristic_descriptor(gatt_client_t * gatt_client, uint16_t descriptor_handle, uint8_t *blob, uint16_t blob_length, uint16_t value_offset){ 761 uint8_t * packet = setup_long_characteristic_value_packet(GATT_EVENT_LONG_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, gatt_client->con_handle, descriptor_handle, value_offset, blob, blob_length); 762 if (!packet) return; 763 emit_event_new(gatt_client->callback, packet, blob_length + long_characteristic_value_event_header_size); 764 } 765 766 static void report_gatt_all_characteristic_descriptors(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size, uint16_t pair_size){ 767 int i; 768 for (i = 0u; (i + pair_size) <= size; i += pair_size){ 769 uint16_t descriptor_handle = little_endian_read_16(packet,i); 770 uint8_t uuid128[16]; 771 uint16_t uuid16 = 0; 772 if (pair_size == 4u){ 773 uuid16 = little_endian_read_16(packet,i+2); 774 uuid_add_bluetooth_prefix(uuid128, uuid16); 775 } else { 776 reverse_128(&packet[i+2], uuid128); 777 } 778 emit_gatt_all_characteristic_descriptors_result_event(gatt_client, descriptor_handle, uuid128); 779 } 780 781 } 782 783 static int is_query_done(gatt_client_t * gatt_client, uint16_t last_result_handle){ 784 return last_result_handle >= gatt_client->end_group_handle; 785 } 786 787 static void trigger_next_query(gatt_client_t * gatt_client, uint16_t last_result_handle, gatt_client_state_t next_query_state){ 788 if (is_query_done(gatt_client, last_result_handle)){ 789 gatt_client_handle_transaction_complete(gatt_client); 790 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 791 return; 792 } 793 // next 794 gatt_client->start_group_handle = last_result_handle + 1u; 795 gatt_client->gatt_client_state = next_query_state; 796 } 797 798 static void trigger_next_included_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 799 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_INCLUDED_SERVICE_QUERY); 800 } 801 802 static void trigger_next_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 803 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_QUERY); 804 } 805 806 static void trigger_next_service_by_uuid_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 807 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_WITH_UUID_QUERY); 808 } 809 810 static void trigger_next_characteristic_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 811 if (is_query_done(gatt_client, last_result_handle)){ 812 // report last characteristic 813 characteristic_end_found(gatt_client, gatt_client->end_group_handle); 814 } 815 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY); 816 } 817 818 static void trigger_next_characteristic_descriptor_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 819 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY); 820 } 821 822 static void trigger_next_read_by_type_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 823 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_READ_BY_TYPE_REQUEST); 824 } 825 826 static void trigger_next_prepare_write_query(gatt_client_t * gatt_client, gatt_client_state_t next_query_state, gatt_client_state_t done_state){ 827 gatt_client->attribute_offset += write_blob_length(gatt_client); 828 uint16_t next_blob_length = write_blob_length(gatt_client); 829 830 if (next_blob_length == 0u){ 831 gatt_client->gatt_client_state = done_state; 832 return; 833 } 834 gatt_client->gatt_client_state = next_query_state; 835 } 836 837 static void trigger_next_blob_query(gatt_client_t * gatt_client, gatt_client_state_t next_query_state, uint16_t received_blob_length){ 838 839 uint16_t max_blob_length = gatt_client->mtu - 1u; 840 if (received_blob_length < max_blob_length){ 841 gatt_client_handle_transaction_complete(gatt_client); 842 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 843 return; 844 } 845 846 gatt_client->attribute_offset += received_blob_length; 847 gatt_client->gatt_client_state = next_query_state; 848 } 849 850 851 static int is_value_valid(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size){ 852 uint16_t attribute_handle = little_endian_read_16(packet, 1); 853 uint16_t value_offset = little_endian_read_16(packet, 3); 854 855 if (gatt_client->attribute_handle != attribute_handle) return 0; 856 if (gatt_client->attribute_offset != value_offset) return 0; 857 return memcmp(&gatt_client->attribute_value[gatt_client->attribute_offset], &packet[5], size - 5u) == 0u; 858 } 859 860 // returns 1 if packet was sent 861 static int gatt_client_run_for_gatt_client(gatt_client_t * gatt_client){ 862 863 // wait until re-encryption as central is complete 864 if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return 0; 865 866 #ifdef ENABLE_LE_PROACTIVE_AUTHENTICATION 867 // wait until re-encryption complete 868 if (gatt_client->reencryption_active) return 0; 869 #endif 870 871 #ifdef ENABLE_GATT_CLIENT_PAIRING 872 // wait until pairing complete 873 if (gatt_client->wait_for_pairing_complete) return 0; 874 #endif 875 876 switch (gatt_client->mtu_state) { 877 case SEND_MTU_EXCHANGE: 878 gatt_client->mtu_state = SENT_MTU_EXCHANGE; 879 att_exchange_mtu_request(gatt_client->con_handle); 880 return 1; 881 case SENT_MTU_EXCHANGE: 882 return 0; 883 default: 884 break; 885 } 886 887 if (gatt_client->send_confirmation){ 888 gatt_client->send_confirmation = 0; 889 att_confirmation(gatt_client->con_handle); 890 return 1; 891 } 892 893 // check MTU for writes 894 switch (gatt_client->gatt_client_state){ 895 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 896 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 897 if (gatt_client->attribute_length <= (gatt_client->mtu - 3u)) break; 898 log_error("gatt_client_run: value len %u > MTU %u - 3\n", gatt_client->attribute_length,gatt_client->mtu); 899 gatt_client_handle_transaction_complete(gatt_client); 900 emit_gatt_complete_event(gatt_client, ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH); 901 return 0; 902 default: 903 break; 904 } 905 906 switch (gatt_client->gatt_client_state){ 907 case P_W2_SEND_SERVICE_QUERY: 908 gatt_client->gatt_client_state = P_W4_SERVICE_QUERY_RESULT; 909 send_gatt_services_request(gatt_client); 910 return 1; 911 912 case P_W2_SEND_SERVICE_WITH_UUID_QUERY: 913 gatt_client->gatt_client_state = P_W4_SERVICE_WITH_UUID_RESULT; 914 send_gatt_services_by_uuid_request(gatt_client); 915 return 1; 916 917 case P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY: 918 gatt_client->gatt_client_state = P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT; 919 send_gatt_characteristic_request(gatt_client); 920 return 1; 921 922 case P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY: 923 gatt_client->gatt_client_state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 924 send_gatt_characteristic_request(gatt_client); 925 return 1; 926 927 case P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY: 928 gatt_client->gatt_client_state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 929 send_gatt_characteristic_descriptor_request(gatt_client); 930 return 1; 931 932 case P_W2_SEND_INCLUDED_SERVICE_QUERY: 933 gatt_client->gatt_client_state = P_W4_INCLUDED_SERVICE_QUERY_RESULT; 934 send_gatt_included_service_request(gatt_client); 935 return 1; 936 937 case P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY: 938 gatt_client->gatt_client_state = P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT; 939 send_gatt_included_service_uuid_request(gatt_client); 940 return 1; 941 942 case P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY: 943 gatt_client->gatt_client_state = P_W4_READ_CHARACTERISTIC_VALUE_RESULT; 944 send_gatt_read_characteristic_value_request(gatt_client); 945 return 1; 946 947 case P_W2_SEND_READ_BLOB_QUERY: 948 gatt_client->gatt_client_state = P_W4_READ_BLOB_RESULT; 949 send_gatt_read_blob_request(gatt_client); 950 return 1; 951 952 case P_W2_SEND_READ_BY_TYPE_REQUEST: 953 gatt_client->gatt_client_state = P_W4_READ_BY_TYPE_RESPONSE; 954 send_gatt_read_by_type_request(gatt_client); 955 return 1; 956 957 case P_W2_SEND_READ_MULTIPLE_REQUEST: 958 gatt_client->gatt_client_state = P_W4_READ_MULTIPLE_RESPONSE; 959 send_gatt_read_multiple_request(gatt_client); 960 return 1; 961 962 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 963 gatt_client->gatt_client_state = P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT; 964 send_gatt_write_attribute_value_request(gatt_client); 965 return 1; 966 967 case P_W2_PREPARE_WRITE: 968 gatt_client->gatt_client_state = P_W4_PREPARE_WRITE_RESULT; 969 send_gatt_prepare_write_request(gatt_client); 970 return 1; 971 972 case P_W2_PREPARE_WRITE_SINGLE: 973 gatt_client->gatt_client_state = P_W4_PREPARE_WRITE_SINGLE_RESULT; 974 send_gatt_prepare_write_request(gatt_client); 975 return 1; 976 977 case P_W2_PREPARE_RELIABLE_WRITE: 978 gatt_client->gatt_client_state = P_W4_PREPARE_RELIABLE_WRITE_RESULT; 979 send_gatt_prepare_write_request(gatt_client); 980 return 1; 981 982 case P_W2_EXECUTE_PREPARED_WRITE: 983 gatt_client->gatt_client_state = P_W4_EXECUTE_PREPARED_WRITE_RESULT; 984 send_gatt_execute_write_request(gatt_client); 985 return 1; 986 987 case P_W2_CANCEL_PREPARED_WRITE: 988 gatt_client->gatt_client_state = P_W4_CANCEL_PREPARED_WRITE_RESULT; 989 send_gatt_cancel_prepared_write_request(gatt_client); 990 return 1; 991 992 case P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH: 993 gatt_client->gatt_client_state = P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT; 994 send_gatt_cancel_prepared_write_request(gatt_client); 995 return 1; 996 997 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 998 case P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 999 // use Find Information 1000 gatt_client->gatt_client_state = P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1001 send_gatt_characteristic_descriptor_request(gatt_client); 1002 #else 1003 case P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 1004 // Use Read By Type 1005 gatt_client->gatt_client_state = P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1006 send_gatt_read_client_characteristic_configuration_request(gatt_client); 1007 #endif 1008 return 1; 1009 1010 case P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY: 1011 gatt_client->gatt_client_state = P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT; 1012 send_gatt_read_characteristic_descriptor_request(gatt_client); 1013 return 1; 1014 1015 case P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY: 1016 gatt_client->gatt_client_state = P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT; 1017 send_gatt_read_blob_request(gatt_client); 1018 return 1; 1019 1020 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 1021 gatt_client->gatt_client_state = P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1022 send_gatt_write_attribute_value_request(gatt_client); 1023 return 1; 1024 1025 case P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION: 1026 gatt_client->gatt_client_state = P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT; 1027 send_gatt_write_client_characteristic_configuration_request(gatt_client); 1028 return 1; 1029 1030 case P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR: 1031 gatt_client->gatt_client_state = P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1032 send_gatt_prepare_write_request(gatt_client); 1033 return 1; 1034 1035 case P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR: 1036 gatt_client->gatt_client_state = P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1037 send_gatt_execute_write_request(gatt_client); 1038 return 1; 1039 1040 #ifdef ENABLE_LE_SIGNED_WRITE 1041 case P_W4_IDENTITY_RESOLVING: 1042 log_info("P_W4_IDENTITY_RESOLVING - state %x", sm_identity_resolving_state(gatt_client->con_handle)); 1043 switch (sm_identity_resolving_state(gatt_client->con_handle)){ 1044 case IRK_LOOKUP_SUCCEEDED: 1045 gatt_client->le_device_index = sm_le_device_index(gatt_client->con_handle); 1046 gatt_client->gatt_client_state = P_W4_CMAC_READY; 1047 break; 1048 case IRK_LOOKUP_FAILED: 1049 gatt_client_handle_transaction_complete(gatt_client); 1050 emit_gatt_complete_event(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1051 return 0; 1052 default: 1053 return 0; 1054 } 1055 1056 /* Fall through */ 1057 1058 case P_W4_CMAC_READY: 1059 if (sm_cmac_ready()){ 1060 sm_key_t csrk; 1061 le_device_db_local_csrk_get(gatt_client->le_device_index, csrk); 1062 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 1063 gatt_client->gatt_client_state = P_W4_CMAC_RESULT; 1064 sm_cmac_signed_write_start(csrk, ATT_SIGNED_WRITE_COMMAND, gatt_client->attribute_handle, gatt_client->attribute_length, gatt_client->attribute_value, sign_counter, att_signed_write_handle_cmac_result); 1065 } 1066 return 0; 1067 1068 case P_W2_SEND_SIGNED_WRITE: { 1069 gatt_client->gatt_client_state = P_W4_SEND_SINGED_WRITE_DONE; 1070 // bump local signing counter 1071 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 1072 le_device_db_local_counter_set(gatt_client->le_device_index, sign_counter + 1); 1073 // send signed write command 1074 send_gatt_signed_write_request(gatt_client, sign_counter); 1075 // finally, notifiy client that write is complete 1076 gatt_client_handle_transaction_complete(gatt_client); 1077 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1078 return 1; 1079 } 1080 #endif 1081 default: 1082 break; 1083 } 1084 1085 // requested can send snow? 1086 if (gatt_client->write_without_response_callback){ 1087 btstack_packet_handler_t packet_handler = gatt_client->write_without_response_callback; 1088 gatt_client->write_without_response_callback = NULL; 1089 uint8_t event[4]; 1090 event[0] = GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE; 1091 event[1] = sizeof(event) - 2u; 1092 little_endian_store_16(event, 2, gatt_client->con_handle); 1093 packet_handler(HCI_EVENT_PACKET, gatt_client->con_handle, event, sizeof(event)); 1094 return 1; // to trigger requeueing (even if higher layer didn't sent) 1095 } 1096 1097 return 0; 1098 } 1099 1100 static void gatt_client_run(void){ 1101 btstack_linked_item_t *it; 1102 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 1103 gatt_client_t * gatt_client = (gatt_client_t *) it; 1104 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) { 1105 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1106 return; 1107 } 1108 int packet_sent = gatt_client_run_for_gatt_client(gatt_client); 1109 if (packet_sent){ 1110 // request new permission 1111 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1112 // requeue client for fairness and exit 1113 // note: iterator has become invalid 1114 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1115 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1116 return; 1117 } 1118 } 1119 } 1120 1121 static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code) { 1122 if (is_ready(gatt_client) == 1) return; 1123 gatt_client_handle_transaction_complete(gatt_client); 1124 emit_gatt_complete_event(gatt_client, att_error_code); 1125 } 1126 1127 static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1128 UNUSED(channel); // ok: handling own l2cap events 1129 UNUSED(size); // ok: there is no channel 1130 1131 if (packet_type != HCI_EVENT_PACKET) return; 1132 1133 hci_con_handle_t con_handle; 1134 gatt_client_t * gatt_client; 1135 switch (hci_event_packet_get_type(packet)) { 1136 case HCI_EVENT_DISCONNECTION_COMPLETE: 1137 log_info("GATT Client: HCI_EVENT_DISCONNECTION_COMPLETE"); 1138 con_handle = little_endian_read_16(packet,3); 1139 gatt_client = gatt_client_get_context_for_handle(con_handle); 1140 if (gatt_client == NULL) break; 1141 1142 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 1143 gatt_client_timeout_stop(gatt_client); 1144 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1145 btstack_memory_gatt_client_free(gatt_client); 1146 break; 1147 1148 #ifdef ENABLE_GATT_CLIENT_PAIRING 1149 // Pairing complete (with/without bonding=storing of pairing information) 1150 case SM_EVENT_PAIRING_COMPLETE: 1151 con_handle = sm_event_pairing_complete_get_handle(packet); 1152 gatt_client = gatt_client_get_context_for_handle(con_handle); 1153 if (gatt_client == NULL) break; 1154 1155 if (gatt_client->wait_for_pairing_complete){ 1156 gatt_client->wait_for_pairing_complete = 0; 1157 if (sm_event_pairing_complete_get_status(packet)){ 1158 log_info("pairing failed, report previous error 0x%x", gatt_client->pending_error_code); 1159 gatt_client_report_error_if_pending(gatt_client, gatt_client->pending_error_code); 1160 } else { 1161 log_info("pairing success, retry operation"); 1162 } 1163 } 1164 break; 1165 #endif 1166 #ifdef ENABLE_LE_SIGNED_WRITE 1167 // Identity Resolving completed (no code, gatt_client_run will continue) 1168 case SM_EVENT_IDENTITY_RESOLVING_SUCCEEDED: 1169 case SM_EVENT_IDENTITY_RESOLVING_FAILED: 1170 break; 1171 #endif 1172 #ifdef ENABLE_LE_PROACTIVE_AUTHENTICATION 1173 // re-encryption started 1174 case SM_EVENT_REENCRYPTION_STARTED: 1175 con_handle = sm_event_reencryption_complete_get_handle(packet); 1176 gatt_client = gatt_client_get_context_for_handle(con_handle); 1177 if (gatt_client == NULL) break; 1178 1179 gatt_client->reencryption_active = true; 1180 gatt_client->reencryption_result = ERROR_CODE_SUCCESS; 1181 break; 1182 1183 // re-encryption complete 1184 case SM_EVENT_REENCRYPTION_COMPLETE: 1185 con_handle = sm_event_reencryption_complete_get_handle(packet); 1186 gatt_client = gatt_client_get_context_for_handle(con_handle); 1187 if (gatt_client == NULL) break; 1188 1189 // report bonding information missing, if re-encryption failed 1190 gatt_client->reencryption_result = sm_event_reencryption_complete_get_status(packet); 1191 gatt_client->reencryption_active = false; 1192 if (gatt_client->reencryption_result != ERROR_CODE_SUCCESS){ 1193 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1194 } else { 1195 log_info("re-encryption success, retry operation"); 1196 } 1197 break; 1198 #endif 1199 default: 1200 break; 1201 } 1202 1203 gatt_client_run(); 1204 } 1205 1206 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 1207 gatt_client_t * gatt_client; 1208 if (size < 1u) return; 1209 1210 if (packet_type == HCI_EVENT_PACKET) { 1211 switch (packet[0]){ 1212 case L2CAP_EVENT_CAN_SEND_NOW: 1213 gatt_client_run(); 1214 break; 1215 // att_server has negotiated the mtu for this connection, cache if context exists 1216 case ATT_EVENT_MTU_EXCHANGE_COMPLETE: 1217 if (size < 6u) break; 1218 gatt_client = gatt_client_get_context_for_handle(handle); 1219 if (gatt_client == NULL) break; 1220 gatt_client->mtu = little_endian_read_16(packet, 4); 1221 break; 1222 default: 1223 break; 1224 } 1225 return; 1226 } 1227 1228 if (packet_type != ATT_DATA_PACKET) return; 1229 1230 // special cases: notifications don't need a context while indications motivate creating one 1231 switch (packet[0]){ 1232 case ATT_HANDLE_VALUE_NOTIFICATION: 1233 if (size < 3u) return; 1234 report_gatt_notification(handle, little_endian_read_16(packet,1u), &packet[3], size-3u); 1235 return; 1236 case ATT_HANDLE_VALUE_INDICATION: 1237 gatt_client = gatt_client_provide_context_for_handle(handle); 1238 break; 1239 default: 1240 gatt_client = gatt_client_get_context_for_handle(handle); 1241 break; 1242 } 1243 1244 if (gatt_client == NULL) return; 1245 1246 uint8_t error_code; 1247 switch (packet[0]){ 1248 case ATT_EXCHANGE_MTU_RESPONSE: 1249 { 1250 if (size < 3u) break; 1251 uint16_t remote_rx_mtu = little_endian_read_16(packet, 1); 1252 uint16_t local_rx_mtu = l2cap_max_le_mtu(); 1253 gatt_client->mtu = (remote_rx_mtu < local_rx_mtu) ? remote_rx_mtu : local_rx_mtu; 1254 gatt_client->mtu_state = MTU_EXCHANGED; 1255 emit_gatt_mtu_exchanged_result_event(gatt_client, gatt_client->mtu); 1256 break; 1257 } 1258 case ATT_READ_BY_GROUP_TYPE_RESPONSE: 1259 switch(gatt_client->gatt_client_state){ 1260 case P_W4_SERVICE_QUERY_RESULT: 1261 report_gatt_services(gatt_client, packet, size); 1262 trigger_next_service_query(gatt_client, get_last_result_handle_from_service_list(packet, size)); 1263 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1264 break; 1265 default: 1266 break; 1267 } 1268 break; 1269 case ATT_HANDLE_VALUE_INDICATION: 1270 if (size < 3u) break; 1271 report_gatt_indication(handle, little_endian_read_16(packet,1u), &packet[3], size-3u); 1272 gatt_client->send_confirmation = 1; 1273 break; 1274 1275 case ATT_READ_BY_TYPE_RESPONSE: 1276 switch (gatt_client->gatt_client_state){ 1277 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 1278 report_gatt_characteristics(gatt_client, packet, size); 1279 trigger_next_characteristic_query(gatt_client, get_last_result_handle_from_characteristics_list(packet, size)); 1280 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1281 break; 1282 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 1283 report_gatt_characteristics(gatt_client, packet, size); 1284 trigger_next_characteristic_query(gatt_client, get_last_result_handle_from_characteristics_list(packet, size)); 1285 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1286 break; 1287 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: 1288 { 1289 if (size < 2u) break; 1290 uint16_t uuid16 = 0; 1291 uint16_t pair_size = packet[1]; 1292 1293 if (pair_size == 6u){ 1294 if (size < 8u) break; 1295 // UUIDs not available, query first included service 1296 gatt_client->start_group_handle = little_endian_read_16(packet, 2); // ready for next query 1297 gatt_client->query_start_handle = little_endian_read_16(packet, 4); 1298 gatt_client->query_end_handle = little_endian_read_16(packet, 6); 1299 gatt_client->gatt_client_state = P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY; 1300 break; 1301 } 1302 1303 if (pair_size != 8u) break; 1304 1305 // UUIDs included, report all of them 1306 uint16_t offset; 1307 for (offset = 2u; (offset + 8u) <= size; offset += pair_size){ 1308 uint16_t include_handle = little_endian_read_16(packet, offset); 1309 gatt_client->query_start_handle = little_endian_read_16(packet, offset + 2u); 1310 gatt_client->query_end_handle = little_endian_read_16(packet, offset + 4u); 1311 uuid16 = little_endian_read_16(packet, offset+6u); 1312 report_gatt_included_service_uuid16(gatt_client, include_handle, uuid16); 1313 } 1314 1315 trigger_next_included_service_query(gatt_client, get_last_result_handle_from_included_services_list(packet, size)); 1316 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1317 break; 1318 } 1319 #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1320 case P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT: 1321 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, 2); 1322 gatt_client->gatt_client_state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 1323 break; 1324 #endif 1325 case P_W4_READ_BY_TYPE_RESPONSE: { 1326 uint16_t pair_size = packet[1]; 1327 uint16_t offset; 1328 uint16_t last_result_handle = 0; 1329 for (offset = 2; offset < size ; offset += pair_size){ 1330 uint16_t value_handle = little_endian_read_16(packet, offset); 1331 report_gatt_characteristic_value(gatt_client, value_handle, &packet[offset + 2u], pair_size - 2u); 1332 last_result_handle = value_handle; 1333 } 1334 trigger_next_read_by_type_query(gatt_client, last_result_handle); 1335 break; 1336 } 1337 default: 1338 break; 1339 } 1340 break; 1341 case ATT_READ_RESPONSE: 1342 switch (gatt_client->gatt_client_state){ 1343 case P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT: { 1344 uint8_t uuid128[16]; 1345 reverse_128(&packet[1], uuid128); 1346 report_gatt_included_service_uuid128(gatt_client, gatt_client->start_group_handle, uuid128); 1347 trigger_next_included_service_query(gatt_client, gatt_client->start_group_handle); 1348 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1349 break; 1350 } 1351 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 1352 gatt_client_handle_transaction_complete(gatt_client); 1353 report_gatt_characteristic_value(gatt_client, gatt_client->attribute_handle, &packet[1], size - 1u); 1354 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1355 break; 1356 1357 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT:{ 1358 gatt_client_handle_transaction_complete(gatt_client); 1359 report_gatt_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], size - 1u, 0u); 1360 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1361 break; 1362 } 1363 default: 1364 break; 1365 } 1366 break; 1367 1368 case ATT_FIND_BY_TYPE_VALUE_RESPONSE: 1369 { 1370 uint8_t pair_size = 4; 1371 int i; 1372 uint16_t start_group_handle; 1373 uint16_t end_group_handle= 0xffff; // asserts GATT_EVENT_QUERY_COMPLETE is emitted if no results 1374 for (i = 1u; (i + pair_size) <= size; i += pair_size){ 1375 start_group_handle = little_endian_read_16(packet,i); 1376 end_group_handle = little_endian_read_16(packet,i+2); 1377 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, gatt_client->uuid128); 1378 } 1379 trigger_next_service_by_uuid_query(gatt_client, end_group_handle); 1380 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1381 break; 1382 } 1383 case ATT_FIND_INFORMATION_REPLY: 1384 { 1385 if (size < 2u) break; 1386 1387 uint8_t pair_size = 4; 1388 if (packet[1u] == 2u){ 1389 pair_size = 18; 1390 } 1391 uint16_t offset = 2; 1392 1393 if (size < (pair_size + offset)) break; 1394 uint16_t last_descriptor_handle = little_endian_read_16(packet, size - pair_size); 1395 1396 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1397 log_info("ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY, state %x", gatt_client->gatt_client_state); 1398 if (gatt_client->gatt_client_state == P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT){ 1399 // iterate over descriptors looking for CCC 1400 if (pair_size == 4){ 1401 while ((offset + 4) <= size){ 1402 uint16_t uuid16 = little_endian_read_16(packet, offset + 2); 1403 if (uuid16 == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION){ 1404 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, offset); 1405 gatt_client->gatt_client_state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 1406 log_info("CCC found %x", gatt_client->client_characteristic_configuration_handle); 1407 break; 1408 } 1409 offset += pair_size; 1410 } 1411 } 1412 if (is_query_done(gatt_client, last_descriptor_handle)){ 1413 1414 } else { 1415 // next 1416 gatt_client->start_group_handle = last_descriptor_handle + 1; 1417 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 1418 } 1419 break; 1420 } 1421 #endif 1422 report_gatt_all_characteristic_descriptors(gatt_client, &packet[2], size - 2u, pair_size); 1423 trigger_next_characteristic_descriptor_query(gatt_client, last_descriptor_handle); 1424 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1425 break; 1426 } 1427 1428 case ATT_WRITE_RESPONSE: 1429 switch (gatt_client->gatt_client_state){ 1430 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 1431 gatt_client_handle_transaction_complete(gatt_client); 1432 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1433 break; 1434 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 1435 gatt_client_handle_transaction_complete(gatt_client); 1436 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1437 break; 1438 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1439 gatt_client_handle_transaction_complete(gatt_client); 1440 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1441 break; 1442 default: 1443 break; 1444 } 1445 break; 1446 1447 case ATT_READ_BLOB_RESPONSE:{ 1448 uint16_t received_blob_length = size-1u; 1449 switch(gatt_client->gatt_client_state){ 1450 case P_W4_READ_BLOB_RESULT: 1451 report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], received_blob_length, gatt_client->attribute_offset); 1452 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, received_blob_length); 1453 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1454 break; 1455 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 1456 report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, 1457 &packet[1], received_blob_length, 1458 gatt_client->attribute_offset); 1459 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, received_blob_length); 1460 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1461 break; 1462 default: 1463 break; 1464 } 1465 break; 1466 } 1467 case ATT_PREPARE_WRITE_RESPONSE: 1468 switch (gatt_client->gatt_client_state){ 1469 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 1470 gatt_client_handle_transaction_complete(gatt_client); 1471 if (is_value_valid(gatt_client, packet, size)){ 1472 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1473 } else { 1474 emit_gatt_complete_event(gatt_client, ATT_ERROR_DATA_MISMATCH); 1475 } 1476 break; 1477 1478 case P_W4_PREPARE_WRITE_RESULT:{ 1479 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 1480 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE, P_W2_EXECUTE_PREPARED_WRITE); 1481 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1482 break; 1483 } 1484 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT:{ 1485 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 1486 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR, P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR); 1487 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1488 break; 1489 } 1490 case P_W4_PREPARE_RELIABLE_WRITE_RESULT:{ 1491 if (is_value_valid(gatt_client, packet, size)){ 1492 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 1493 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_RELIABLE_WRITE, P_W2_EXECUTE_PREPARED_WRITE); 1494 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1495 break; 1496 } 1497 gatt_client->gatt_client_state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 1498 break; 1499 } 1500 default: 1501 break; 1502 } 1503 break; 1504 1505 case ATT_EXECUTE_WRITE_RESPONSE: 1506 switch (gatt_client->gatt_client_state){ 1507 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 1508 gatt_client_handle_transaction_complete(gatt_client); 1509 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1510 break; 1511 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 1512 gatt_client_handle_transaction_complete(gatt_client); 1513 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1514 break; 1515 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 1516 gatt_client_handle_transaction_complete(gatt_client); 1517 emit_gatt_complete_event(gatt_client, ATT_ERROR_DATA_MISMATCH); 1518 break; 1519 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1520 gatt_client_handle_transaction_complete(gatt_client); 1521 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1522 break; 1523 default: 1524 break; 1525 1526 } 1527 break; 1528 1529 case ATT_READ_MULTIPLE_RESPONSE: 1530 switch(gatt_client->gatt_client_state){ 1531 case P_W4_READ_MULTIPLE_RESPONSE: 1532 report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); 1533 gatt_client_handle_transaction_complete(gatt_client); 1534 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1535 break; 1536 default: 1537 break; 1538 } 1539 break; 1540 1541 case ATT_ERROR_RESPONSE: 1542 if (size < 5u) return; 1543 error_code = packet[4]; 1544 switch (error_code){ 1545 case ATT_ERROR_ATTRIBUTE_NOT_FOUND: { 1546 switch(gatt_client->gatt_client_state){ 1547 case P_W4_SERVICE_QUERY_RESULT: 1548 case P_W4_SERVICE_WITH_UUID_RESULT: 1549 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: 1550 case P_W4_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT: 1551 gatt_client_handle_transaction_complete(gatt_client); 1552 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1553 break; 1554 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 1555 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 1556 characteristic_end_found(gatt_client, gatt_client->end_group_handle); 1557 gatt_client_handle_transaction_complete(gatt_client); 1558 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1559 break; 1560 case P_W4_READ_BY_TYPE_RESPONSE: 1561 gatt_client_handle_transaction_complete(gatt_client); 1562 if (gatt_client->start_group_handle == gatt_client->query_start_handle){ 1563 emit_gatt_complete_event(gatt_client, ATT_ERROR_ATTRIBUTE_NOT_FOUND); 1564 } else { 1565 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1566 } 1567 break; 1568 default: 1569 gatt_client_report_error_if_pending(gatt_client, error_code); 1570 break; 1571 } 1572 break; 1573 } 1574 1575 #ifdef ENABLE_GATT_CLIENT_PAIRING 1576 1577 case ATT_ERROR_INSUFFICIENT_AUTHENTICATION: 1578 case ATT_ERROR_INSUFFICIENT_ENCRYPTION_KEY_SIZE: 1579 case ATT_ERROR_INSUFFICIENT_ENCRYPTION: { 1580 1581 // security too low 1582 if (gatt_client->security_counter > 0) { 1583 gatt_client_report_error_if_pending(gatt_client, error_code); 1584 break; 1585 } 1586 // start security 1587 gatt_client->security_counter++; 1588 1589 // setup action 1590 int retry = 1; 1591 switch (gatt_client->gatt_client_state){ 1592 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 1593 gatt_client->gatt_client_state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY ; 1594 break; 1595 case P_W4_READ_BLOB_RESULT: 1596 gatt_client->gatt_client_state = P_W2_SEND_READ_BLOB_QUERY; 1597 break; 1598 case P_W4_READ_BY_TYPE_RESPONSE: 1599 gatt_client->gatt_client_state = P_W2_SEND_READ_BY_TYPE_REQUEST; 1600 break; 1601 case P_W4_READ_MULTIPLE_RESPONSE: 1602 gatt_client->gatt_client_state = P_W2_SEND_READ_MULTIPLE_REQUEST; 1603 break; 1604 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 1605 gatt_client->gatt_client_state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 1606 break; 1607 case P_W4_PREPARE_WRITE_RESULT: 1608 gatt_client->gatt_client_state = P_W2_PREPARE_WRITE; 1609 break; 1610 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 1611 gatt_client->gatt_client_state = P_W2_PREPARE_WRITE_SINGLE; 1612 break; 1613 case P_W4_PREPARE_RELIABLE_WRITE_RESULT: 1614 gatt_client->gatt_client_state = P_W2_PREPARE_RELIABLE_WRITE; 1615 break; 1616 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 1617 gatt_client->gatt_client_state = P_W2_EXECUTE_PREPARED_WRITE; 1618 break; 1619 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 1620 gatt_client->gatt_client_state = P_W2_CANCEL_PREPARED_WRITE; 1621 break; 1622 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 1623 gatt_client->gatt_client_state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 1624 break; 1625 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: 1626 gatt_client->gatt_client_state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 1627 break; 1628 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 1629 gatt_client->gatt_client_state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 1630 break; 1631 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1632 gatt_client->gatt_client_state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 1633 break; 1634 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 1635 gatt_client->gatt_client_state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 1636 break; 1637 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1638 gatt_client->gatt_client_state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 1639 break; 1640 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1641 gatt_client->gatt_client_state = P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR; 1642 break; 1643 #ifdef ENABLE_LE_SIGNED_WRITE 1644 case P_W4_SEND_SINGED_WRITE_DONE: 1645 gatt_client->gatt_client_state = P_W2_SEND_SIGNED_WRITE; 1646 break; 1647 #endif 1648 default: 1649 log_info("retry not supported for state %x", gatt_client->gatt_client_state); 1650 retry = 0; 1651 break; 1652 } 1653 1654 if (!retry) { 1655 gatt_client_report_error_if_pending(gatt_client, error_code); 1656 break; 1657 } 1658 1659 log_info("security error, start pairing"); 1660 1661 // start pairing for higher security level 1662 gatt_client->wait_for_pairing_complete = 1; 1663 gatt_client->pending_error_code = error_code; 1664 sm_request_pairing(gatt_client->con_handle); 1665 break; 1666 } 1667 #endif 1668 1669 // nothing we can do about that 1670 case ATT_ERROR_INSUFFICIENT_AUTHORIZATION: 1671 default: 1672 gatt_client_report_error_if_pending(gatt_client, error_code); 1673 break; 1674 } 1675 break; 1676 1677 default: 1678 log_info("ATT Handler, unhandled response type 0x%02x", packet[0]); 1679 break; 1680 } 1681 gatt_client_run(); 1682 } 1683 1684 #ifdef ENABLE_LE_SIGNED_WRITE 1685 static void att_signed_write_handle_cmac_result(uint8_t hash[8]){ 1686 btstack_linked_list_iterator_t it; 1687 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 1688 while (btstack_linked_list_iterator_has_next(&it)){ 1689 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 1690 if (gatt_client->gatt_client_state == P_W4_CMAC_RESULT){ 1691 // store result 1692 (void)memcpy(gatt_client->cmac, hash, 8); 1693 // reverse_64(hash, gatt_client->cmac); 1694 gatt_client->gatt_client_state = P_W2_SEND_SIGNED_WRITE; 1695 gatt_client_run(); 1696 return; 1697 } 1698 } 1699 } 1700 1701 uint8_t gatt_client_signed_write_without_response(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t handle, uint16_t message_len, uint8_t * message){ 1702 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle(con_handle); 1703 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1704 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1705 1706 gatt_client->callback = callback; 1707 gatt_client->attribute_handle = handle; 1708 gatt_client->attribute_length = message_len; 1709 gatt_client->attribute_value = message; 1710 gatt_client->gatt_client_state = P_W4_IDENTITY_RESOLVING; 1711 gatt_client_run(); 1712 return ERROR_CODE_SUCCESS; 1713 } 1714 #endif 1715 1716 uint8_t gatt_client_discover_primary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 1717 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1718 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1719 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1720 1721 gatt_client->callback = callback; 1722 gatt_client->start_group_handle = 0x0001; 1723 gatt_client->end_group_handle = 0xffff; 1724 gatt_client->gatt_client_state = P_W2_SEND_SERVICE_QUERY; 1725 gatt_client->uuid16 = 0; 1726 gatt_client_run(); 1727 return ERROR_CODE_SUCCESS; 1728 } 1729 1730 1731 uint8_t gatt_client_discover_primary_services_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t uuid16){ 1732 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1733 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1734 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1735 1736 gatt_client->callback = callback; 1737 gatt_client->start_group_handle = 0x0001; 1738 gatt_client->end_group_handle = 0xffff; 1739 gatt_client->gatt_client_state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 1740 gatt_client->uuid16 = uuid16; 1741 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), gatt_client->uuid16); 1742 gatt_client_run(); 1743 return ERROR_CODE_SUCCESS; 1744 } 1745 1746 uint8_t gatt_client_discover_primary_services_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, const uint8_t * uuid128){ 1747 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1748 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1749 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1750 1751 gatt_client->callback = callback; 1752 gatt_client->start_group_handle = 0x0001; 1753 gatt_client->end_group_handle = 0xffff; 1754 gatt_client->uuid16 = 0; 1755 (void)memcpy(gatt_client->uuid128, uuid128, 16); 1756 gatt_client->gatt_client_state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 1757 gatt_client_run(); 1758 return ERROR_CODE_SUCCESS; 1759 } 1760 1761 uint8_t gatt_client_discover_characteristics_for_service(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t *service){ 1762 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1763 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1764 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1765 1766 gatt_client->callback = callback; 1767 gatt_client->start_group_handle = service->start_group_handle; 1768 gatt_client->end_group_handle = service->end_group_handle; 1769 gatt_client->filter_with_uuid = 0; 1770 gatt_client->characteristic_start_handle = 0; 1771 gatt_client->gatt_client_state = P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY; 1772 gatt_client_run(); 1773 return ERROR_CODE_SUCCESS; 1774 } 1775 1776 uint8_t gatt_client_find_included_services_for_service(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t *service){ 1777 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1778 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1779 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1780 gatt_client->callback = callback; 1781 gatt_client->start_group_handle = service->start_group_handle; 1782 gatt_client->end_group_handle = service->end_group_handle; 1783 gatt_client->gatt_client_state = P_W2_SEND_INCLUDED_SERVICE_QUERY; 1784 1785 gatt_client_run(); 1786 return ERROR_CODE_SUCCESS; 1787 } 1788 1789 uint8_t gatt_client_discover_characteristics_for_handle_range_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t start_handle, uint16_t end_handle, uint16_t uuid16){ 1790 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1791 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1792 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1793 1794 gatt_client->callback = callback; 1795 gatt_client->start_group_handle = start_handle; 1796 gatt_client->end_group_handle = end_handle; 1797 gatt_client->filter_with_uuid = 1; 1798 gatt_client->uuid16 = uuid16; 1799 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 1800 gatt_client->characteristic_start_handle = 0; 1801 gatt_client->gatt_client_state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 1802 gatt_client_run(); 1803 return ERROR_CODE_SUCCESS; 1804 } 1805 1806 uint8_t gatt_client_discover_characteristics_for_handle_range_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t start_handle, uint16_t end_handle, uint8_t * uuid128){ 1807 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1808 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1809 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1810 1811 gatt_client->callback = callback; 1812 gatt_client->start_group_handle = start_handle; 1813 gatt_client->end_group_handle = end_handle; 1814 gatt_client->filter_with_uuid = 1; 1815 gatt_client->uuid16 = 0; 1816 (void)memcpy(gatt_client->uuid128, uuid128, 16); 1817 gatt_client->characteristic_start_handle = 0; 1818 gatt_client->gatt_client_state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 1819 gatt_client_run(); 1820 return ERROR_CODE_SUCCESS; 1821 } 1822 1823 1824 uint8_t gatt_client_discover_characteristics_for_service_by_uuid16(btstack_packet_handler_t callback, uint16_t handle, gatt_client_service_t *service, uint16_t uuid16){ 1825 return gatt_client_discover_characteristics_for_handle_range_by_uuid16(callback, handle, service->start_group_handle, service->end_group_handle, uuid16); 1826 } 1827 1828 uint8_t gatt_client_discover_characteristics_for_service_by_uuid128(btstack_packet_handler_t callback, uint16_t handle, gatt_client_service_t *service, uint8_t * uuid128){ 1829 return gatt_client_discover_characteristics_for_handle_range_by_uuid128(callback, handle, service->start_group_handle, service->end_group_handle, uuid128); 1830 } 1831 1832 uint8_t gatt_client_discover_characteristic_descriptors(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t *characteristic){ 1833 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1834 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1835 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1836 1837 if (characteristic->value_handle == characteristic->end_handle){ 1838 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1839 return ERROR_CODE_SUCCESS; 1840 } 1841 gatt_client->callback = callback; 1842 gatt_client->start_group_handle = characteristic->value_handle + 1u; 1843 gatt_client->end_group_handle = characteristic->end_handle; 1844 gatt_client->gatt_client_state = P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY; 1845 gatt_client_run(); 1846 return ERROR_CODE_SUCCESS; 1847 } 1848 1849 uint8_t gatt_client_read_value_of_characteristic_using_value_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle){ 1850 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1851 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1852 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1853 1854 gatt_client->callback = callback; 1855 gatt_client->attribute_handle = value_handle; 1856 gatt_client->attribute_offset = 0; 1857 gatt_client->gatt_client_state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY; 1858 gatt_client_run(); 1859 return ERROR_CODE_SUCCESS; 1860 } 1861 1862 uint8_t gatt_client_read_value_of_characteristics_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t start_handle, uint16_t end_handle, uint16_t uuid16){ 1863 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1864 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1865 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1866 1867 gatt_client->callback = callback; 1868 gatt_client->start_group_handle = start_handle; 1869 gatt_client->end_group_handle = end_handle; 1870 gatt_client->query_start_handle = start_handle; 1871 gatt_client->query_end_handle = end_handle; 1872 gatt_client->uuid16 = uuid16; 1873 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 1874 gatt_client->gatt_client_state = P_W2_SEND_READ_BY_TYPE_REQUEST; 1875 gatt_client_run(); 1876 return ERROR_CODE_SUCCESS; 1877 } 1878 1879 uint8_t gatt_client_read_value_of_characteristics_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t start_handle, uint16_t end_handle, uint8_t * uuid128){ 1880 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1881 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1882 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1883 1884 gatt_client->callback = callback; 1885 gatt_client->start_group_handle = start_handle; 1886 gatt_client->end_group_handle = end_handle; 1887 gatt_client->query_start_handle = start_handle; 1888 gatt_client->query_end_handle = end_handle; 1889 gatt_client->uuid16 = 0; 1890 (void)memcpy(gatt_client->uuid128, uuid128, 16); 1891 gatt_client->gatt_client_state = P_W2_SEND_READ_BY_TYPE_REQUEST; 1892 gatt_client_run(); 1893 return ERROR_CODE_SUCCESS; 1894 } 1895 1896 1897 uint8_t gatt_client_read_value_of_characteristic(btstack_packet_handler_t callback, uint16_t handle, gatt_client_characteristic_t *characteristic){ 1898 return gatt_client_read_value_of_characteristic_using_value_handle(callback, handle, characteristic->value_handle); 1899 } 1900 1901 uint8_t gatt_client_read_long_value_of_characteristic_using_value_handle_with_offset(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t characteristic_value_handle, uint16_t offset){ 1902 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1903 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1904 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1905 1906 gatt_client->callback = callback; 1907 gatt_client->attribute_handle = characteristic_value_handle; 1908 gatt_client->attribute_offset = offset; 1909 gatt_client->gatt_client_state = P_W2_SEND_READ_BLOB_QUERY; 1910 gatt_client_run(); 1911 return ERROR_CODE_SUCCESS; 1912 } 1913 1914 uint8_t gatt_client_read_long_value_of_characteristic_using_value_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t characteristic_value_handle){ 1915 return gatt_client_read_long_value_of_characteristic_using_value_handle_with_offset(callback, con_handle, characteristic_value_handle, 0); 1916 } 1917 1918 uint8_t gatt_client_read_long_value_of_characteristic(btstack_packet_handler_t callback, uint16_t handle, gatt_client_characteristic_t *characteristic){ 1919 return gatt_client_read_long_value_of_characteristic_using_value_handle(callback, handle, characteristic->value_handle); 1920 } 1921 1922 uint8_t gatt_client_read_multiple_characteristic_values(btstack_packet_handler_t callback, hci_con_handle_t con_handle, int num_value_handles, uint16_t * value_handles){ 1923 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1924 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1925 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1926 1927 gatt_client->callback = callback; 1928 gatt_client->read_multiple_handle_count = num_value_handles; 1929 gatt_client->read_multiple_handles = value_handles; 1930 gatt_client->gatt_client_state = P_W2_SEND_READ_MULTIPLE_REQUEST; 1931 gatt_client_run(); 1932 return ERROR_CODE_SUCCESS; 1933 } 1934 1935 uint8_t gatt_client_write_value_of_characteristic_without_response(hci_con_handle_t con_handle, uint16_t value_handle, uint16_t value_length, uint8_t * value){ 1936 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle(con_handle); 1937 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1938 1939 if (value_length > (gatt_client->mtu - 3u)) return GATT_CLIENT_VALUE_TOO_LONG; 1940 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) return GATT_CLIENT_BUSY; 1941 1942 return att_write_request(ATT_WRITE_COMMAND, gatt_client->con_handle, value_handle, value_length, value); 1943 } 1944 1945 uint8_t gatt_client_write_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t value_length, uint8_t * data){ 1946 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1947 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1948 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1949 1950 gatt_client->callback = callback; 1951 gatt_client->attribute_handle = value_handle; 1952 gatt_client->attribute_length = value_length; 1953 gatt_client->attribute_value = data; 1954 gatt_client->gatt_client_state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 1955 gatt_client_run(); 1956 return ERROR_CODE_SUCCESS; 1957 } 1958 1959 uint8_t gatt_client_write_long_value_of_characteristic_with_offset(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t offset, uint16_t value_length, uint8_t * data){ 1960 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1961 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1962 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1963 1964 gatt_client->callback = callback; 1965 gatt_client->attribute_handle = value_handle; 1966 gatt_client->attribute_length = value_length; 1967 gatt_client->attribute_offset = offset; 1968 gatt_client->attribute_value = data; 1969 gatt_client->gatt_client_state = P_W2_PREPARE_WRITE; 1970 gatt_client_run(); 1971 return ERROR_CODE_SUCCESS; 1972 } 1973 1974 uint8_t gatt_client_write_long_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t value_length, uint8_t * value){ 1975 return gatt_client_write_long_value_of_characteristic_with_offset(callback, con_handle, value_handle, 0, value_length, value); 1976 } 1977 1978 uint8_t gatt_client_reliable_write_long_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t value_length, uint8_t * value){ 1979 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1980 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1981 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1982 1983 gatt_client->callback = callback; 1984 gatt_client->attribute_handle = value_handle; 1985 gatt_client->attribute_length = value_length; 1986 gatt_client->attribute_offset = 0; 1987 gatt_client->attribute_value = value; 1988 gatt_client->gatt_client_state = P_W2_PREPARE_RELIABLE_WRITE; 1989 gatt_client_run(); 1990 return ERROR_CODE_SUCCESS; 1991 } 1992 1993 uint8_t gatt_client_write_client_characteristic_configuration(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic, uint16_t configuration){ 1994 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 1995 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 1996 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 1997 1998 if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION) && 1999 ((characteristic->properties & ATT_PROPERTY_NOTIFY) == 0u)) { 2000 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED"); 2001 return GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED; 2002 } else if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION) && 2003 ((characteristic->properties & ATT_PROPERTY_INDICATE) == 0u)){ 2004 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED"); 2005 return GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED; 2006 } 2007 2008 gatt_client->callback = callback; 2009 gatt_client->start_group_handle = characteristic->value_handle; 2010 gatt_client->end_group_handle = characteristic->end_handle; 2011 little_endian_store_16(gatt_client->client_characteristic_configuration_value, 0, configuration); 2012 2013 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 2014 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2015 #else 2016 gatt_client->gatt_client_state = P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2017 #endif 2018 gatt_client_run(); 2019 return ERROR_CODE_SUCCESS; 2020 } 2021 2022 uint8_t gatt_client_read_characteristic_descriptor_using_descriptor_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle){ 2023 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 2024 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 2025 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 2026 2027 gatt_client->callback = callback; 2028 gatt_client->attribute_handle = descriptor_handle; 2029 2030 gatt_client->gatt_client_state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 2031 gatt_client_run(); 2032 return ERROR_CODE_SUCCESS; 2033 } 2034 2035 uint8_t gatt_client_read_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor){ 2036 return gatt_client_read_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2037 } 2038 2039 uint8_t gatt_client_read_long_characteristic_descriptor_using_descriptor_handle_with_offset(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle, uint16_t offset){ 2040 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 2041 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 2042 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 2043 2044 gatt_client->callback = callback; 2045 gatt_client->attribute_handle = descriptor_handle; 2046 gatt_client->attribute_offset = offset; 2047 gatt_client->gatt_client_state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 2048 gatt_client_run(); 2049 return ERROR_CODE_SUCCESS; 2050 } 2051 2052 uint8_t gatt_client_read_long_characteristic_descriptor_using_descriptor_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle){ 2053 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0); 2054 } 2055 2056 uint8_t gatt_client_read_long_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor){ 2057 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2058 } 2059 2060 uint8_t gatt_client_write_characteristic_descriptor_using_descriptor_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle, uint16_t length, uint8_t * data){ 2061 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 2062 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 2063 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 2064 2065 gatt_client->callback = callback; 2066 gatt_client->attribute_handle = descriptor_handle; 2067 gatt_client->attribute_length = length; 2068 gatt_client->attribute_offset = 0; 2069 gatt_client->attribute_value = data; 2070 gatt_client->gatt_client_state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 2071 gatt_client_run(); 2072 return ERROR_CODE_SUCCESS; 2073 } 2074 2075 uint8_t gatt_client_write_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor, uint16_t length, uint8_t * value){ 2076 return gatt_client_write_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, length, value); 2077 } 2078 2079 uint8_t gatt_client_write_long_characteristic_descriptor_using_descriptor_handle_with_offset(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle, uint16_t offset, uint16_t length, uint8_t * data){ 2080 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 2081 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 2082 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 2083 2084 gatt_client->callback = callback; 2085 gatt_client->attribute_handle = descriptor_handle; 2086 gatt_client->attribute_length = length; 2087 gatt_client->attribute_offset = offset; 2088 gatt_client->attribute_value = data; 2089 gatt_client->gatt_client_state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 2090 gatt_client_run(); 2091 return ERROR_CODE_SUCCESS; 2092 } 2093 2094 uint8_t gatt_client_write_long_characteristic_descriptor_using_descriptor_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle, uint16_t length, uint8_t * data){ 2095 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0, length, data ); 2096 } 2097 2098 uint8_t gatt_client_write_long_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor, uint16_t length, uint8_t * value){ 2099 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, length, value); 2100 } 2101 2102 /** 2103 * @brief -> gatt complete event 2104 */ 2105 uint8_t gatt_client_prepare_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint16_t length, uint8_t * data){ 2106 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 2107 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 2108 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 2109 2110 gatt_client->callback = callback; 2111 gatt_client->attribute_handle = attribute_handle; 2112 gatt_client->attribute_length = length; 2113 gatt_client->attribute_offset = offset; 2114 gatt_client->attribute_value = data; 2115 gatt_client->gatt_client_state = P_W2_PREPARE_WRITE_SINGLE; 2116 gatt_client_run(); 2117 return ERROR_CODE_SUCCESS; 2118 } 2119 2120 /** 2121 * @brief -> gatt complete event 2122 */ 2123 uint8_t gatt_client_execute_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2124 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 2125 2126 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 2127 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 2128 2129 gatt_client->callback = callback; 2130 gatt_client->gatt_client_state = P_W2_EXECUTE_PREPARED_WRITE; 2131 gatt_client_run(); 2132 return ERROR_CODE_SUCCESS; 2133 } 2134 2135 /** 2136 * @brief -> gatt complete event 2137 */ 2138 uint8_t gatt_client_cancel_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2139 gatt_client_t * gatt_client = gatt_client_provide_context_for_handle_and_start_timer(con_handle); 2140 if (gatt_client == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 2141 if (is_ready(gatt_client) == 0) return GATT_CLIENT_IN_WRONG_STATE; 2142 2143 gatt_client->callback = callback; 2144 gatt_client->gatt_client_state = P_W2_CANCEL_PREPARED_WRITE; 2145 gatt_client_run(); 2146 return ERROR_CODE_SUCCESS; 2147 } 2148 2149 void gatt_client_deserialize_service(const uint8_t *packet, int offset, gatt_client_service_t *service){ 2150 service->start_group_handle = little_endian_read_16(packet, offset); 2151 service->end_group_handle = little_endian_read_16(packet, offset + 2); 2152 reverse_128(&packet[offset + 4], service->uuid128); 2153 if (uuid_has_bluetooth_prefix(service->uuid128)){ 2154 service->uuid16 = big_endian_read_32(service->uuid128, 0); 2155 } else { 2156 service->uuid16 = 0; 2157 } 2158 } 2159 2160 void gatt_client_deserialize_characteristic(const uint8_t * packet, int offset, gatt_client_characteristic_t * characteristic){ 2161 characteristic->start_handle = little_endian_read_16(packet, offset); 2162 characteristic->value_handle = little_endian_read_16(packet, offset + 2); 2163 characteristic->end_handle = little_endian_read_16(packet, offset + 4); 2164 characteristic->properties = little_endian_read_16(packet, offset + 6); 2165 reverse_128(&packet[offset+8], characteristic->uuid128); 2166 if (uuid_has_bluetooth_prefix(characteristic->uuid128)){ 2167 characteristic->uuid16 = big_endian_read_32(characteristic->uuid128, 0); 2168 } else { 2169 characteristic->uuid16 = 0; 2170 } 2171 } 2172 2173 void gatt_client_deserialize_characteristic_descriptor(const uint8_t * packet, int offset, gatt_client_characteristic_descriptor_t * descriptor){ 2174 descriptor->handle = little_endian_read_16(packet, offset); 2175 reverse_128(&packet[offset+2], descriptor->uuid128); 2176 if (uuid_has_bluetooth_prefix(descriptor->uuid128)){ 2177 descriptor->uuid16 = big_endian_read_32(descriptor->uuid128, 0); 2178 } else { 2179 descriptor->uuid16 = 0; 2180 } 2181 } 2182 2183 void gatt_client_send_mtu_negotiation(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2184 gatt_client_t * context = gatt_client_provide_context_for_handle(con_handle); 2185 if (context == NULL) return; 2186 if (context->mtu_state == MTU_AUTO_EXCHANGE_DISABLED){ 2187 context->callback = callback; 2188 context->mtu_state = SEND_MTU_EXCHANGE; 2189 gatt_client_run(); 2190 } 2191 } 2192 2193 uint8_t gatt_client_request_can_write_without_response_event(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2194 gatt_client_t * context = gatt_client_provide_context_for_handle(con_handle); 2195 if (context == NULL) return BTSTACK_MEMORY_ALLOC_FAILED; 2196 if (context->write_without_response_callback != NULL) return GATT_CLIENT_IN_WRONG_STATE; 2197 context->write_without_response_callback = callback; 2198 att_dispatch_client_request_can_send_now_event(context->con_handle); 2199 return ERROR_CODE_SUCCESS; 2200 } 2201 2202 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 2203 void gatt_client_att_packet_handler_fuzz(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 2204 gatt_client_att_packet_handler(packet_type, handle, packet, size); 2205 } 2206 #endif 2207