1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN 24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "gatt_client.c" 39 40 #include <stdint.h> 41 #include <string.h> 42 #include <stddef.h> 43 44 #include "btstack_config.h" 45 46 #include "ble/att_dispatch.h" 47 #include "ble/att_db.h" 48 #include "ble/gatt_client.h" 49 #include "ble/le_device_db.h" 50 #include "ble/sm.h" 51 #include "bluetooth_psm.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 "hci.h" 58 #include "hci_dump.h" 59 #include "hci_event_builder.h" 60 #include "l2cap.h" 61 #include "classic/sdp_client.h" 62 #include "bluetooth_gatt.h" 63 #include "bluetooth_sdp.h" 64 #include "classic/sdp_util.h" 65 66 #if defined(ENABLE_GATT_OVER_EATT) && !defined(ENABLE_L2CAP_ENHANCED_CREDIT_BASED_FLOW_CONTROL_MODE) 67 #error "GATT Over EATT requires support for L2CAP Enhanced CoC. Please enable ENABLE_L2CAP_ENHANCED_CREDIT_BASED_FLOW_CONTROL_MODE" 68 #endif 69 70 // L2CAP Test Spec p35 defines a minimum of 100 ms, but PTS might indicate an error if we sent after 100 ms 71 #define GATT_CLIENT_COLLISION_BACKOFF_MS 150 72 73 static btstack_linked_list_t gatt_client_connections; 74 static btstack_linked_list_t gatt_client_value_listeners; 75 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 76 static btstack_linked_list_t gatt_client_service_changed_handler; 77 #endif 78 static btstack_packet_callback_registration_t hci_event_callback_registration; 79 static btstack_packet_callback_registration_t sm_event_callback_registration; 80 static btstack_context_callback_registration_t gatt_client_deferred_event_emit; 81 82 // GATT Client Configuration 83 static bool gatt_client_mtu_exchange_enabled; 84 static gap_security_level_t gatt_client_required_security_level; 85 86 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size); 87 static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 88 static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code); 89 90 #ifdef ENABLE_LE_SIGNED_WRITE 91 static void att_signed_write_handle_cmac_result(uint8_t hash[8]); 92 #endif 93 94 #ifdef ENABLE_GATT_OVER_CLASSIC 95 static gatt_client_t * gatt_client_get_context_for_l2cap_cid(uint16_t l2cap_cid); 96 static void gatt_client_classic_handle_connected(gatt_client_t * gatt_client, uint8_t status); 97 static void gatt_client_classic_handle_disconnected(gatt_client_t * gatt_client); 98 static void gatt_client_classic_retry(btstack_timer_source_t * ts); 99 #endif 100 101 #ifdef ENABLE_GATT_OVER_EATT 102 static bool gatt_client_le_enhanced_handle_can_send_query(gatt_client_t * gatt_client); 103 static void gatt_client_le_enhanced_retry(btstack_timer_source_t * ts); 104 #endif 105 106 void gatt_client_init(void){ 107 gatt_client_connections = NULL; 108 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 109 gatt_client_service_changed_handler = NULL; 110 #endif 111 // default configuration 112 gatt_client_mtu_exchange_enabled = true; 113 gatt_client_required_security_level = LEVEL_0; 114 115 // register for HCI Events 116 hci_event_callback_registration.callback = &gatt_client_event_packet_handler; 117 hci_add_event_handler(&hci_event_callback_registration); 118 119 // register for SM Events 120 sm_event_callback_registration.callback = &gatt_client_event_packet_handler; 121 sm_add_event_handler(&sm_event_callback_registration); 122 123 // and ATT Client PDUs 124 att_dispatch_register_client(gatt_client_att_packet_handler); 125 } 126 127 void gatt_client_set_required_security_level(gap_security_level_t level){ 128 gatt_client_required_security_level = level; 129 } 130 131 static gatt_client_t * gatt_client_for_timer(btstack_timer_source_t * ts){ 132 btstack_linked_list_iterator_t it; 133 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 134 while (btstack_linked_list_iterator_has_next(&it)){ 135 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 136 if (&gatt_client->gc_timeout == ts) { 137 return gatt_client; 138 } 139 } 140 return NULL; 141 } 142 143 static void gatt_client_timeout_handler(btstack_timer_source_t * timer){ 144 gatt_client_t * gatt_client = gatt_client_for_timer(timer); 145 if (gatt_client == NULL) return; 146 log_info("GATT client timeout handle, handle 0x%02x", gatt_client->con_handle); 147 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_TIMEOUT); 148 } 149 150 static void gatt_client_timeout_start(gatt_client_t * gatt_client){ 151 log_debug("GATT client timeout start, handle 0x%02x", gatt_client->con_handle); 152 btstack_run_loop_remove_timer(&gatt_client->gc_timeout); 153 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_timeout_handler); 154 btstack_run_loop_set_timer(&gatt_client->gc_timeout, 30000); // 30 seconds sm timeout 155 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 156 } 157 158 static void gatt_client_timeout_stop(gatt_client_t * gatt_client){ 159 log_debug("GATT client timeout stop, handle 0x%02x", gatt_client->con_handle); 160 btstack_run_loop_remove_timer(&gatt_client->gc_timeout); 161 } 162 163 static gap_security_level_t gatt_client_le_security_level_for_connection(hci_con_handle_t con_handle){ 164 uint8_t encryption_key_size = gap_encryption_key_size(con_handle); 165 if (encryption_key_size == 0) return LEVEL_0; 166 167 bool authenticated = gap_authenticated(con_handle); 168 if (!authenticated) return LEVEL_2; 169 170 return encryption_key_size == 16 ? LEVEL_4 : LEVEL_3; 171 } 172 173 static gatt_client_t * gatt_client_get_context_for_handle(uint16_t handle){ 174 btstack_linked_item_t *it; 175 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 176 gatt_client_t * gatt_client = (gatt_client_t *) it; 177 if (gatt_client->con_handle == handle){ 178 return gatt_client; 179 } 180 } 181 return NULL; 182 } 183 184 185 // @return gatt_client context 186 // returns existing one, or tries to setup new one 187 static uint8_t gatt_client_provide_context_for_handle(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 188 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 189 190 if (gatt_client != NULL){ 191 *out_gatt_client = gatt_client; 192 return ERROR_CODE_SUCCESS; 193 } 194 195 // bail if no such hci connection 196 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 197 if (hci_connection == NULL){ 198 log_error("No connection for handle 0x%04x", con_handle); 199 *out_gatt_client = NULL; 200 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 201 } 202 203 gatt_client = btstack_memory_gatt_client_get(); 204 if (gatt_client == NULL){ 205 *out_gatt_client = NULL; 206 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 207 } 208 // init state 209 gatt_client->bearer_type = ATT_BEARER_UNENHANCED_LE; 210 gatt_client->con_handle = con_handle; 211 gatt_client->mtu = ATT_DEFAULT_MTU; 212 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 213 if (gatt_client_mtu_exchange_enabled){ 214 gatt_client->mtu_state = SEND_MTU_EXCHANGE; 215 } else { 216 gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 217 } 218 gatt_client->state = P_READY; 219 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_W2_SEND; 220 #ifdef ENABLE_GATT_OVER_EATT 221 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 222 #endif 223 btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); 224 225 // get unenhanced att bearer state 226 if (hci_connection->att_connection.mtu_exchanged){ 227 gatt_client->mtu = hci_connection->att_connection.mtu; 228 gatt_client->mtu_state = MTU_EXCHANGED; 229 } 230 *out_gatt_client = gatt_client; 231 return ERROR_CODE_SUCCESS; 232 } 233 234 static bool is_ready(gatt_client_t * gatt_client){ 235 return gatt_client->state == P_READY; 236 } 237 238 static uint8_t gatt_client_provide_context_for_request(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 239 gatt_client_t * gatt_client = NULL; 240 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 241 if (status != ERROR_CODE_SUCCESS){ 242 return status; 243 } 244 245 #ifdef ENABLE_GATT_OVER_EATT 246 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY){ 247 btstack_linked_list_iterator_t it; 248 gatt_client_t * eatt_client = NULL; 249 // find free eatt client 250 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 251 while (btstack_linked_list_iterator_has_next(&it)){ 252 gatt_client_t * client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 253 if (client->state == P_READY){ 254 eatt_client = client; 255 break; 256 } 257 } 258 if (eatt_client == NULL){ 259 return ERROR_CODE_COMMAND_DISALLOWED; 260 } 261 gatt_client = eatt_client; 262 } 263 #endif 264 265 if (is_ready(gatt_client) == false){ 266 return GATT_CLIENT_IN_WRONG_STATE; 267 } 268 269 gatt_client_timeout_start(gatt_client); 270 271 *out_gatt_client = gatt_client; 272 273 return status; 274 } 275 276 int gatt_client_is_ready(hci_con_handle_t con_handle){ 277 gatt_client_t * gatt_client; 278 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 279 if (status != ERROR_CODE_SUCCESS){ 280 return 0; 281 } 282 return is_ready(gatt_client) ? 1 : 0; 283 } 284 285 void gatt_client_mtu_enable_auto_negotiation(uint8_t enabled){ 286 gatt_client_mtu_exchange_enabled = enabled != 0; 287 } 288 289 uint8_t gatt_client_get_mtu(hci_con_handle_t con_handle, uint16_t * mtu){ 290 gatt_client_t * gatt_client; 291 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 292 if (status != ERROR_CODE_SUCCESS){ 293 return status; 294 } 295 296 if ((gatt_client->mtu_state == MTU_EXCHANGED) || (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED)){ 297 *mtu = gatt_client->mtu; 298 return ERROR_CODE_SUCCESS; 299 } 300 *mtu = ATT_DEFAULT_MTU; 301 return GATT_CLIENT_IN_WRONG_STATE; 302 } 303 304 static uint8_t *gatt_client_reserve_request_buffer(gatt_client_t *gatt_client) { 305 switch (gatt_client->bearer_type){ 306 #ifdef ENABLE_GATT_OVER_CLASSIC 307 case ATT_BEARER_UNENHANCED_CLASSIC: 308 #endif 309 case ATT_BEARER_UNENHANCED_LE: 310 l2cap_reserve_packet_buffer(); 311 return l2cap_get_outgoing_buffer(); 312 #ifdef ENABLE_GATT_OVER_EATT 313 case ATT_BEARER_ENHANCED_LE: 314 return gatt_client->eatt_storage_buffer; 315 #endif 316 default: 317 btstack_unreachable(); 318 break; 319 } 320 return NULL; 321 } 322 323 // precondition: can_send_packet_now == TRUE 324 static uint8_t gatt_client_send(gatt_client_t * gatt_client, uint16_t len){ 325 switch (gatt_client->bearer_type){ 326 case ATT_BEARER_UNENHANCED_LE: 327 return l2cap_send_prepared_connectionless(gatt_client->con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, len); 328 #ifdef ENABLE_GATT_OVER_CLASSIC 329 case ATT_BEARER_UNENHANCED_CLASSIC: 330 return l2cap_send_prepared(gatt_client->l2cap_cid, len); 331 #endif 332 #ifdef ENABLE_GATT_OVER_EATT 333 case ATT_BEARER_ENHANCED_LE: 334 return l2cap_send(gatt_client->l2cap_cid, gatt_client->eatt_storage_buffer, len); 335 #endif 336 default: 337 btstack_unreachable(); 338 return ERROR_CODE_HARDWARE_FAILURE; 339 } 340 } 341 342 // precondition: can_send_packet_now == TRUE 343 static uint8_t att_confirmation(gatt_client_t * gatt_client) { 344 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 345 346 request[0] = ATT_HANDLE_VALUE_CONFIRMATION; 347 348 return gatt_client_send(gatt_client, 1); 349 } 350 351 // precondition: can_send_packet_now == TRUE 352 static uint8_t att_find_information_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t start_handle, 353 uint16_t end_handle) { 354 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 355 356 request[0] = request_type; 357 little_endian_store_16(request, 1, start_handle); 358 little_endian_store_16(request, 3, end_handle); 359 360 return gatt_client_send(gatt_client, 5); 361 } 362 363 // precondition: can_send_packet_now == TRUE 364 static uint8_t 365 att_find_by_type_value_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_group_type, 366 uint16_t start_handle, uint16_t end_handle, uint8_t *value, uint16_t value_size) { 367 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 368 request[0] = request_type; 369 370 little_endian_store_16(request, 1, start_handle); 371 little_endian_store_16(request, 3, end_handle); 372 little_endian_store_16(request, 5, attribute_group_type); 373 (void)memcpy(&request[7], value, value_size); 374 375 return gatt_client_send(gatt_client, 7u + value_size); 376 } 377 378 // precondition: can_send_packet_now == TRUE 379 static uint8_t 380 att_read_by_type_or_group_request_for_uuid16(gatt_client_t *gatt_client, uint8_t request_type, uint16_t uuid16, 381 uint16_t start_handle, uint16_t end_handle) { 382 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 383 384 request[0] = request_type; 385 little_endian_store_16(request, 1, start_handle); 386 little_endian_store_16(request, 3, end_handle); 387 little_endian_store_16(request, 5, uuid16); 388 389 return gatt_client_send(gatt_client, 7); 390 } 391 392 // precondition: can_send_packet_now == TRUE 393 static uint8_t 394 att_read_by_type_or_group_request_for_uuid128(gatt_client_t *gatt_client, uint8_t request_type, const uint8_t *uuid128, 395 uint16_t start_handle, uint16_t end_handle) { 396 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 397 398 request[0] = request_type; 399 little_endian_store_16(request, 1, start_handle); 400 little_endian_store_16(request, 3, end_handle); 401 reverse_128(uuid128, &request[5]); 402 403 return gatt_client_send(gatt_client, 21); 404 } 405 406 // precondition: can_send_packet_now == TRUE 407 static uint8_t att_read_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle) { 408 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 409 410 request[0] = request_type; 411 little_endian_store_16(request, 1, attribute_handle); 412 413 return gatt_client_send(gatt_client, 3); 414 } 415 416 // precondition: can_send_packet_now == TRUE 417 static uint8_t att_read_blob_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, 418 uint16_t value_offset) { 419 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 420 421 request[0] = request_type; 422 little_endian_store_16(request, 1, attribute_handle); 423 little_endian_store_16(request, 3, value_offset); 424 425 return gatt_client_send(gatt_client, 5); 426 } 427 428 static uint8_t 429 att_read_multiple_request_with_opcode(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles, uint8_t opcode) { 430 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 431 432 request[0] = opcode; 433 uint16_t i; 434 uint16_t offset = 1; 435 for (i=0;i<num_value_handles;i++){ 436 little_endian_store_16(request, offset, value_handles[i]); 437 offset += 2; 438 } 439 440 return gatt_client_send(gatt_client, offset); 441 } 442 443 static uint8_t 444 att_read_multiple_request(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles) { 445 return att_read_multiple_request_with_opcode(gatt_client, num_value_handles, value_handles, ATT_READ_MULTIPLE_REQUEST); 446 } 447 448 #ifdef ENABLE_GATT_OVER_EATT 449 static uint8_t 450 att_read_multiple_variable_request(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles) { 451 return att_read_multiple_request_with_opcode(gatt_client, num_value_handles, value_handles, ATT_READ_MULTIPLE_VARIABLE_REQ); 452 } 453 #endif 454 455 #ifdef ENABLE_LE_SIGNED_WRITE 456 // precondition: can_send_packet_now == TRUE 457 static uint8_t att_signed_write_request(gatt_client_t *gatt_client, uint16_t request_type, uint16_t attribute_handle, 458 uint16_t value_length, uint8_t *value, uint32_t sign_counter, uint8_t sgn[8]) { 459 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 460 461 request[0] = request_type; 462 little_endian_store_16(request, 1, attribute_handle); 463 (void)memcpy(&request[3], value, value_length); 464 little_endian_store_32(request, 3 + value_length, sign_counter); 465 reverse_64(sgn, &request[3 + value_length + 4]); 466 467 return gatt_client_send(gatt_client, 3 + value_length + 12); 468 } 469 #endif 470 471 // precondition: can_send_packet_now == TRUE 472 static uint8_t 473 att_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, uint16_t value_length, 474 uint8_t *value) { 475 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 476 477 request[0] = request_type; 478 little_endian_store_16(request, 1, attribute_handle); 479 (void)memcpy(&request[3], value, value_length); 480 481 return gatt_client_send(gatt_client, 3u + value_length); 482 } 483 484 // precondition: can_send_packet_now == TRUE 485 static uint8_t att_execute_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint8_t execute_write) { 486 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 487 488 request[0] = request_type; 489 request[1] = execute_write; 490 491 return gatt_client_send(gatt_client, 2); 492 } 493 494 // precondition: can_send_packet_now == TRUE 495 static uint8_t att_prepare_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, 496 uint16_t value_offset, uint16_t blob_length, uint8_t *value) { 497 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 498 499 request[0] = request_type; 500 little_endian_store_16(request, 1, attribute_handle); 501 little_endian_store_16(request, 3, value_offset); 502 (void)memcpy(&request[5], &value[value_offset], blob_length); 503 504 return gatt_client_send(gatt_client, 5u + blob_length); 505 } 506 507 static uint8_t att_exchange_mtu_request(gatt_client_t *gatt_client) { 508 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 509 510 request[0] = ATT_EXCHANGE_MTU_REQUEST; 511 uint16_t mtu = l2cap_max_le_mtu(); 512 little_endian_store_16(request, 1, mtu); 513 514 return gatt_client_send(gatt_client, 3); 515 } 516 517 static uint16_t write_blob_length(gatt_client_t * gatt_client){ 518 uint16_t max_blob_length = gatt_client->mtu - 5u; 519 if (gatt_client->attribute_offset >= gatt_client->attribute_length) { 520 return 0; 521 } 522 uint16_t rest_length = gatt_client->attribute_length - gatt_client->attribute_offset; 523 if (max_blob_length > rest_length){ 524 return rest_length; 525 } 526 return max_blob_length; 527 } 528 529 static void send_gatt_services_request(gatt_client_t *gatt_client){ 530 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_GROUP_TYPE_REQUEST, 531 gatt_client->uuid16, gatt_client->start_group_handle, 532 gatt_client->end_group_handle); 533 } 534 535 static void send_gatt_by_uuid_request(gatt_client_t *gatt_client, uint16_t attribute_group_type){ 536 if (gatt_client->uuid16 != 0u){ 537 uint8_t uuid16[2]; 538 little_endian_store_16(uuid16, 0, gatt_client->uuid16); 539 att_find_by_type_value_request(gatt_client, ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, 540 gatt_client->start_group_handle, gatt_client->end_group_handle, uuid16, 2); 541 return; 542 } 543 uint8_t uuid128[16]; 544 reverse_128(gatt_client->uuid128, uuid128); 545 att_find_by_type_value_request(gatt_client, ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, 546 gatt_client->start_group_handle, gatt_client->end_group_handle, uuid128, 16); 547 } 548 549 static void send_gatt_services_by_uuid_request(gatt_client_t *gatt_client){ 550 send_gatt_by_uuid_request(gatt_client, GATT_PRIMARY_SERVICE_UUID); 551 } 552 553 static void send_gatt_included_service_uuid_request(gatt_client_t *gatt_client){ 554 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->query_start_handle); 555 } 556 557 static void send_gatt_included_service_request(gatt_client_t *gatt_client){ 558 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 559 GATT_INCLUDE_SERVICE_UUID, gatt_client->start_group_handle, 560 gatt_client->end_group_handle); 561 } 562 563 static void send_gatt_characteristic_request(gatt_client_t *gatt_client){ 564 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 565 GATT_CHARACTERISTICS_UUID, gatt_client->start_group_handle, 566 gatt_client->end_group_handle); 567 } 568 569 static void send_gatt_characteristic_descriptor_request(gatt_client_t *gatt_client){ 570 att_find_information_request(gatt_client, ATT_FIND_INFORMATION_REQUEST, gatt_client->start_group_handle, 571 gatt_client->end_group_handle); 572 } 573 574 static void send_gatt_read_characteristic_value_request(gatt_client_t *gatt_client){ 575 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 576 } 577 578 static void send_gatt_read_by_type_request(gatt_client_t * gatt_client){ 579 if (gatt_client->uuid16 != 0u){ 580 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 581 gatt_client->uuid16, gatt_client->start_group_handle, 582 gatt_client->end_group_handle); 583 } else { 584 att_read_by_type_or_group_request_for_uuid128(gatt_client, ATT_READ_BY_TYPE_REQUEST, 585 gatt_client->uuid128, gatt_client->start_group_handle, 586 gatt_client->end_group_handle); 587 } 588 } 589 590 static void send_gatt_read_blob_request(gatt_client_t *gatt_client){ 591 if (gatt_client->attribute_offset == 0){ 592 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 593 } else { 594 att_read_blob_request(gatt_client, ATT_READ_BLOB_REQUEST, gatt_client->attribute_handle, 595 gatt_client->attribute_offset); 596 } 597 } 598 599 static void send_gatt_read_multiple_request(gatt_client_t * gatt_client){ 600 att_read_multiple_request(gatt_client, gatt_client->read_multiple_handle_count, gatt_client->read_multiple_handles); 601 } 602 603 #ifdef ENABLE_GATT_OVER_EATT 604 static void send_gatt_read_multiple_variable_request(gatt_client_t * gatt_client){ 605 att_read_multiple_variable_request(gatt_client, gatt_client->read_multiple_handle_count, gatt_client->read_multiple_handles); 606 } 607 #endif 608 609 static void send_gatt_write_attribute_value_request(gatt_client_t * gatt_client){ 610 att_write_request(gatt_client, ATT_WRITE_REQUEST, gatt_client->attribute_handle, gatt_client->attribute_length, 611 gatt_client->attribute_value); 612 } 613 614 static void send_gatt_write_client_characteristic_configuration_request(gatt_client_t * gatt_client){ 615 att_write_request(gatt_client, ATT_WRITE_REQUEST, gatt_client->client_characteristic_configuration_handle, 2, 616 gatt_client->client_characteristic_configuration_value); 617 } 618 619 static void send_gatt_prepare_write_request(gatt_client_t * gatt_client){ 620 att_prepare_write_request(gatt_client, ATT_PREPARE_WRITE_REQUEST, gatt_client->attribute_handle, 621 gatt_client->attribute_offset, write_blob_length(gatt_client), 622 gatt_client->attribute_value); 623 } 624 625 static void send_gatt_execute_write_request(gatt_client_t * gatt_client){ 626 att_execute_write_request(gatt_client, ATT_EXECUTE_WRITE_REQUEST, 1); 627 } 628 629 static void send_gatt_cancel_prepared_write_request(gatt_client_t * gatt_client){ 630 att_execute_write_request(gatt_client, ATT_EXECUTE_WRITE_REQUEST, 0); 631 } 632 633 #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 634 static void send_gatt_read_client_characteristic_configuration_request(gatt_client_t * gatt_client){ 635 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 636 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION, 637 gatt_client->start_group_handle, gatt_client->end_group_handle); 638 } 639 #endif 640 641 static void send_gatt_read_characteristic_descriptor_request(gatt_client_t * gatt_client){ 642 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 643 } 644 645 #ifdef ENABLE_LE_SIGNED_WRITE 646 static void send_gatt_signed_write_request(gatt_client_t * gatt_client, uint32_t sign_counter){ 647 att_signed_write_request(gatt_client, ATT_SIGNED_WRITE_COMMAND, gatt_client->attribute_handle, 648 gatt_client->attribute_length, gatt_client->attribute_value, sign_counter, 649 gatt_client->cmac); 650 } 651 #endif 652 653 static uint16_t get_last_result_handle_from_service_list(uint8_t * packet, uint16_t size){ 654 if (size < 2) return 0xffff; 655 uint8_t attr_length = packet[1]; 656 if ((2 + attr_length) > size) return 0xffff; 657 return little_endian_read_16(packet, size - attr_length + 2u); 658 } 659 660 static uint16_t get_last_result_handle_from_characteristics_list(uint8_t * packet, uint16_t size){ 661 if (size < 2) return 0xffff; 662 uint8_t attr_length = packet[1]; 663 if ((2 + attr_length) > size) return 0xffff; 664 return little_endian_read_16(packet, size - attr_length + 3u); 665 } 666 667 static uint16_t get_last_result_handle_from_included_services_list(uint8_t * packet, uint16_t size){ 668 if (size < 2) return 0xffff; 669 uint8_t attr_length = packet[1]; 670 if ((2 + attr_length) > size) return 0xffff; 671 return little_endian_read_16(packet, size - attr_length); 672 } 673 674 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 675 static void gatt_client_service_emit_event(gatt_client_t * gatt_client, uint8_t * event, uint16_t size){ 676 btstack_linked_list_iterator_t it; 677 btstack_linked_list_iterator_init(&it, &gatt_client_service_changed_handler); 678 while (btstack_linked_list_iterator_has_next(&it)) { 679 btstack_packet_callback_registration_t *callback = (btstack_packet_callback_registration_t *) btstack_linked_list_iterator_next(&it); 680 (*callback->callback)(HCI_EVENT_PACKET, (uint16_t) gatt_client->con_handle, event, size); 681 } 682 } 683 684 static void 685 gatt_client_service_emit_database_hash(gatt_client_t *gatt_client, const uint8_t *value, uint16_t value_len) { 686 if (value_len == 16){ 687 uint8_t event[21]; 688 hci_event_builder_context_t context; 689 hci_event_builder_init(&context, event, sizeof(event), HCI_EVENT_GATTSERVICE_META, GATTSERVICE_SUBEVENT_GATT_DATABASE_HASH); 690 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 691 hci_event_builder_add_bytes(&context, value, 16); 692 gatt_client_service_emit_event(gatt_client, event, hci_event_builder_get_length(&context)); 693 } 694 } 695 696 static void 697 gatt_client_service_emit_service_changed(gatt_client_t *gatt_client, const uint8_t *value, uint16_t value_len) { 698 if (value_len == 4){ 699 uint8_t event[9]; 700 hci_event_builder_context_t context; 701 hci_event_builder_init(&context, event, sizeof(event), HCI_EVENT_GATTSERVICE_META, GATTSERVICE_SUBEVENT_GATT_SERVICE_CHANGED); 702 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 703 hci_event_builder_add_bytes(&context, value, 4); 704 gatt_client_service_emit_event(gatt_client, event, hci_event_builder_get_length(&context)); 705 } 706 } 707 708 static void gatt_client_service_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 709 UNUSED(channel); // ok: handling own l2cap events 710 UNUSED(size); // ok: there is no channel 711 712 hci_con_handle_t con_handle; 713 gatt_client_t *gatt_client; 714 gatt_client_service_t service; 715 gatt_client_characteristic_t characteristic; 716 switch (packet_type) { 717 case HCI_EVENT_PACKET: 718 switch (hci_event_packet_get_type(packet)) { 719 case GATT_EVENT_SERVICE_QUERY_RESULT: 720 con_handle = gatt_event_service_query_result_get_handle(packet); 721 gatt_client = gatt_client_get_context_for_handle(con_handle); 722 btstack_assert(gatt_client != NULL); 723 btstack_assert(gatt_client->gatt_service_state == GATT_CLIENT_SERVICE_DISCOVER_W4_DONE); 724 gatt_event_service_query_result_get_service(packet, &service); 725 gatt_client->gatt_service_start_group_handle = service.start_group_handle; 726 gatt_client->gatt_service_end_group_handle = service.end_group_handle; 727 break; 728 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 729 con_handle = gatt_event_characteristic_query_result_get_handle(packet); 730 gatt_client = gatt_client_get_context_for_handle(con_handle); 731 btstack_assert(gatt_client != NULL); 732 btstack_assert(gatt_client->gatt_service_state == GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W4_DONE); 733 gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic); 734 switch (characteristic.uuid16){ 735 case ORG_BLUETOOTH_CHARACTERISTIC_GATT_SERVICE_CHANGED: 736 gatt_client->gatt_service_changed_value_handle = characteristic.value_handle; 737 gatt_client->gatt_service_changed_end_handle = characteristic.end_handle; 738 break; 739 case ORG_BLUETOOTH_CHARACTERISTIC_DATABASE_HASH: 740 gatt_client->gatt_service_database_hash_value_handle = characteristic.value_handle; 741 gatt_client->gatt_service_database_hash_end_handle = characteristic.end_handle; 742 break; 743 default: 744 break; 745 } 746 break; 747 case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: 748 con_handle = gatt_event_characteristic_value_query_result_get_handle(packet); 749 gatt_client = gatt_client_get_context_for_handle(con_handle); 750 btstack_assert(gatt_client != NULL); 751 btstack_assert(gatt_client->gatt_service_state == GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W4_DONE); 752 gatt_client_service_emit_database_hash(gatt_client, 753 gatt_event_characteristic_value_query_result_get_value(packet), 754 gatt_event_characteristic_value_query_result_get_value_length(packet)); 755 break; 756 case GATT_EVENT_QUERY_COMPLETE: 757 con_handle = gatt_event_query_complete_get_handle(packet); 758 gatt_client = gatt_client_get_context_for_handle(con_handle); 759 btstack_assert(gatt_client != NULL); 760 switch (gatt_client->gatt_service_state) { 761 case GATT_CLIENT_SERVICE_DISCOVER_W4_DONE: 762 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W2_SEND; 763 break; 764 case GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W4_DONE: 765 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W2_SEND; 766 break; 767 case GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W4_DONE: 768 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W2_SEND; 769 break; 770 case GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W4_DONE: 771 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W2_SEND; 772 break; 773 case GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W4_DONE: 774 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DONE; 775 break; 776 default: 777 btstack_unreachable(); 778 break; 779 } 780 break; 781 default: 782 break; 783 } 784 break; 785 default: 786 break; 787 } 788 } 789 #endif 790 791 static void gatt_client_notify_can_send_query(gatt_client_t * gatt_client){ 792 793 #ifdef ENABLE_GATT_OVER_EATT 794 // if eatt is ready, notify all clients that can send a query 795 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY){ 796 btstack_linked_list_iterator_t it; 797 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 798 while (btstack_linked_list_iterator_has_next(&it)){ 799 gatt_client_t * client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 800 if (client->state == P_READY){ 801 // call callback 802 btstack_context_callback_registration_t * callback = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->query_requests); 803 if (callback == NULL) { 804 return; 805 } 806 (*callback->callback)(callback->context); 807 } 808 } 809 return; 810 } 811 #endif 812 813 while (gatt_client->state == P_READY){ 814 bool query_sent = false; 815 UNUSED(query_sent); 816 817 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 818 uint8_t status = ERROR_CODE_SUCCESS; 819 gatt_client_service_t gatt_service; 820 gatt_client_characteristic_t characteristic; 821 switch (gatt_client->gatt_service_state){ 822 case GATT_CLIENT_SERVICE_DISCOVER_W2_SEND: 823 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_W4_DONE; 824 status = gatt_client_discover_primary_services_by_uuid16(&gatt_client_service_packet_handler, 825 gatt_client->con_handle, 826 ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 827 query_sent = true; 828 break; 829 case GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W2_SEND: 830 if (gatt_client->gatt_service_start_group_handle != 0){ 831 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W4_DONE; 832 gatt_service.start_group_handle = gatt_client->gatt_service_start_group_handle; 833 gatt_service.end_group_handle = gatt_client->gatt_service_end_group_handle; 834 status = gatt_client_discover_characteristics_for_service(&gatt_client_service_packet_handler, gatt_client->con_handle, &gatt_service); 835 query_sent = true; 836 break; 837 } 838 839 /* fall through */ 840 841 case GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W2_SEND: 842 if (gatt_client->gatt_service_changed_value_handle != 0){ 843 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W4_DONE; 844 characteristic.value_handle = gatt_client->gatt_service_changed_value_handle; 845 characteristic.end_handle = gatt_client->gatt_service_changed_end_handle; 846 // we assume good case. We cannot do much otherwise 847 characteristic.properties = ATT_PROPERTY_INDICATE; 848 status = gatt_client_write_client_characteristic_configuration(&gatt_client_service_packet_handler, 849 gatt_client->con_handle, &characteristic, 850 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION); 851 query_sent = true; 852 break; 853 } 854 855 /* fall through */ 856 857 case GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W2_SEND: 858 if (gatt_client->gatt_service_database_hash_value_handle != 0){ 859 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W4_DONE; 860 status = gatt_client_read_value_of_characteristics_by_uuid16(&gatt_client_service_packet_handler, 861 gatt_client->con_handle, 862 0x0001, 0xffff, ORG_BLUETOOTH_CHARACTERISTIC_DATABASE_HASH); 863 query_sent = true; 864 break; 865 } 866 867 /* fall through */ 868 869 case GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W2_SEND: 870 if (gatt_client->gatt_service_database_hash_value_handle != 0) { 871 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W4_DONE; 872 characteristic.value_handle = gatt_client->gatt_service_database_hash_value_handle; 873 characteristic.end_handle = gatt_client->gatt_service_database_hash_end_handle; 874 // we assume good case. We cannot do much otherwise 875 characteristic.properties = ATT_PROPERTY_INDICATE; 876 status = gatt_client_write_client_characteristic_configuration(&gatt_client_service_packet_handler, 877 gatt_client->con_handle, 878 &characteristic, 879 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION); 880 query_sent = true; 881 break; 882 } 883 884 // DONE 885 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DONE; 886 break; 887 default: 888 break; 889 } 890 btstack_assert(status == ERROR_CODE_SUCCESS); 891 UNUSED(status); 892 if (query_sent){ 893 continue; 894 } 895 #endif 896 897 #ifdef ENABLE_GATT_OVER_EATT 898 query_sent = gatt_client_le_enhanced_handle_can_send_query(gatt_client); 899 if (query_sent){ 900 continue; 901 } 902 #endif 903 btstack_context_callback_registration_t * callback = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->query_requests); 904 if (callback == NULL) { 905 return; 906 } 907 (*callback->callback)(callback->context); 908 } 909 } 910 911 // test if notification/indication should be delivered to application (BLESA) 912 static bool gatt_client_accept_server_message(gatt_client_t *gatt_client) { 913 // ignore messages until re-encryption is complete 914 if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return false; 915 916 // after that ignore if bonded but not encrypted 917 return !gap_bonded(gatt_client->con_handle) || (gap_encryption_key_size(gatt_client->con_handle) > 0); 918 } 919 920 static void emit_event_new(btstack_packet_handler_t callback, uint8_t * packet, uint16_t size){ 921 if (!callback) return; 922 hci_dump_btstack_event(packet, size); 923 (*callback)(HCI_EVENT_PACKET, 0, packet, size); 924 } 925 926 static void emit_event_to_registered_listeners(hci_con_handle_t con_handle, uint16_t attribute_handle, uint8_t * packet, uint16_t size){ 927 btstack_linked_list_iterator_t it; 928 btstack_linked_list_iterator_init(&it, &gatt_client_value_listeners); 929 while (btstack_linked_list_iterator_has_next(&it)){ 930 gatt_client_notification_t * notification = (gatt_client_notification_t*) btstack_linked_list_iterator_next(&it); 931 if ((notification->con_handle != GATT_CLIENT_ANY_CONNECTION) && (notification->con_handle != con_handle)) continue; 932 if ((notification->attribute_handle != GATT_CLIENT_ANY_VALUE_HANDLE) && (notification->attribute_handle != attribute_handle)) continue; 933 (*notification->callback)(HCI_EVENT_PACKET, 0, packet, size); 934 } 935 } 936 937 static void emit_gatt_complete_event(gatt_client_t * gatt_client, uint8_t att_status){ 938 // @format H122 939 uint8_t packet[9]; 940 hci_event_builder_context_t context; 941 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_QUERY_COMPLETE, 0); 942 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 943 hci_event_builder_add_16(&context, gatt_client->service_id); 944 hci_event_builder_add_16(&context, gatt_client->connection_id); 945 hci_event_builder_add_08(&context, att_status); 946 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 947 } 948 949 static void emit_gatt_service_query_result_event(gatt_client_t * gatt_client, uint16_t start_group_handle, uint16_t end_group_handle, const uint8_t * uuid128){ 950 // @format H22X 951 uint8_t packet[28]; 952 hci_event_builder_context_t context; 953 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_SERVICE_QUERY_RESULT, 0); 954 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 955 hci_event_builder_add_16(&context, gatt_client->service_id); 956 hci_event_builder_add_16(&context, gatt_client->connection_id); 957 hci_event_builder_add_16(&context, start_group_handle); 958 hci_event_builder_add_16(&context, end_group_handle); 959 hci_event_builder_add_128(&context, uuid128); 960 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 961 } 962 963 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, const uint8_t * uuid128){ 964 // @format H22X 965 uint8_t packet[30]; 966 hci_event_builder_context_t context; 967 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_INCLUDED_SERVICE_QUERY_RESULT, 0); 968 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 969 hci_event_builder_add_16(&context, gatt_client->service_id); 970 hci_event_builder_add_16(&context, gatt_client->connection_id); 971 hci_event_builder_add_16(&context, include_handle); 972 hci_event_builder_add_16(&context, start_group_handle); 973 hci_event_builder_add_16(&context, end_group_handle); 974 hci_event_builder_add_128(&context, uuid128); 975 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 976 } 977 978 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, 979 uint16_t properties, const uint8_t * uuid128){ 980 // @format H22Y 981 uint8_t packet[32]; 982 hci_event_builder_context_t context; 983 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_CHARACTERISTIC_QUERY_RESULT, 0); 984 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 985 hci_event_builder_add_16(&context, gatt_client->service_id); 986 hci_event_builder_add_16(&context, gatt_client->connection_id); 987 hci_event_builder_add_16(&context, start_handle); 988 hci_event_builder_add_16(&context, value_handle); 989 hci_event_builder_add_16(&context, end_handle); 990 hci_event_builder_add_16(&context, properties); 991 hci_event_builder_add_128(&context, uuid128); 992 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 993 } 994 995 static void emit_gatt_all_characteristic_descriptors_result_event( 996 gatt_client_t * gatt_client, uint16_t descriptor_handle, const uint8_t * uuid128){ 997 // @format H22Z 998 uint8_t packet[26]; 999 hci_event_builder_context_t context; 1000 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT, 0); 1001 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 1002 hci_event_builder_add_16(&context, gatt_client->service_id); 1003 hci_event_builder_add_16(&context, gatt_client->connection_id); 1004 hci_event_builder_add_16(&context, descriptor_handle); 1005 hci_event_builder_add_128(&context, uuid128); 1006 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 1007 } 1008 1009 static void emit_gatt_mtu_exchanged_result_event(gatt_client_t * gatt_client, uint16_t new_mtu){ 1010 // @format H2 1011 uint8_t packet[6]; 1012 packet[0] = GATT_EVENT_MTU; 1013 packet[1] = sizeof(packet) - 2u; 1014 little_endian_store_16(packet, 2, gatt_client->con_handle); 1015 little_endian_store_16(packet, 4, new_mtu); 1016 att_dispatch_client_mtu_exchanged(gatt_client->con_handle, new_mtu); 1017 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 1018 } 1019 1020 // helper 1021 static void gatt_client_handle_transaction_complete(gatt_client_t *gatt_client, uint8_t att_status) { 1022 gatt_client->state = P_READY; 1023 gatt_client_timeout_stop(gatt_client); 1024 emit_gatt_complete_event(gatt_client, att_status); 1025 gatt_client_notify_can_send_query(gatt_client); 1026 } 1027 1028 // @return packet pointer 1029 // @note assume that value is part of an l2cap buffer - overwrite HCI + L2CAP packet headers 1030 #define CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 8 1031 static uint8_t * 1032 setup_characteristic_value_packet(const gatt_client_t *gatt_client, uint8_t type, uint16_t attribute_handle, 1033 uint8_t *value, uint16_t length) { 1034 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 1035 // copy value into test packet for testing 1036 static uint8_t packet[1000]; 1037 memcpy(&packet[CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE], value, length); 1038 #else 1039 // before the value inside the ATT PDU 1040 uint8_t * packet = value - CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE; 1041 #endif 1042 packet[0] = type; 1043 packet[1] = CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 2 + length; 1044 little_endian_store_16(packet, 2, gatt_client->con_handle); 1045 little_endian_store_16(packet, 4, attribute_handle); 1046 little_endian_store_16(packet, 6, length); 1047 return packet; 1048 } 1049 1050 // @return packet pointer 1051 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1052 #define LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 10 1053 1054 // L2CAP Header (4) + ACL Header (4) => 8 bytes 1055 #if !defined(HCI_INCOMING_PRE_BUFFER_SIZE) || ((HCI_INCOMING_PRE_BUFFER_SIZE < LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 8)) 1056 #error "Long Characteristic reads requires HCI_INCOMING_PRE_BUFFER_SIZE >= 2" 1057 #endif 1058 1059 static uint8_t * 1060 setup_long_characteristic_value_packet(const gatt_client_t *gatt_client, uint8_t type, uint16_t attribute_handle, 1061 uint16_t offset, uint8_t *value, uint16_t length) { 1062 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 1063 // avoid using pre ATT headers. 1064 // copy value into test packet for testing 1065 static uint8_t packet[1000]; 1066 memcpy(&packet[LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE], value, length); 1067 #else 1068 // before the value inside the ATT PDU 1069 uint8_t * packet = value - LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE; 1070 #endif 1071 packet[0] = type; 1072 packet[1] = LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 2 + length; 1073 little_endian_store_16(packet, 2, gatt_client->con_handle); 1074 little_endian_store_16(packet, 4, attribute_handle); 1075 little_endian_store_16(packet, 6, offset); 1076 little_endian_store_16(packet, 8, length); 1077 return packet; 1078 } 1079 1080 #if (LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE > CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE) 1081 #define REPORT_PREBUFFER_HEADER LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 1082 #else 1083 #define REPORT_PREBUFFER_HEADER CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 1084 #endif 1085 1086 /// 1087 static void report_gatt_services(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 1088 if (size < 2) return; 1089 uint8_t attr_length = packet[1]; 1090 uint8_t uuid_length = attr_length - 4u; 1091 1092 int i; 1093 for (i = 2; (i+attr_length) <= size; i += attr_length){ 1094 uint16_t start_group_handle = little_endian_read_16(packet,i); 1095 uint16_t end_group_handle = little_endian_read_16(packet,i+2); 1096 uint8_t uuid128[16]; 1097 uint16_t uuid16 = 0; 1098 1099 if (uuid_length == 2u){ 1100 uuid16 = little_endian_read_16(packet, i+4); 1101 uuid_add_bluetooth_prefix((uint8_t*) &uuid128, uuid16); 1102 } else if (uuid_length == 16u) { 1103 reverse_128(&packet[i+4], uuid128); 1104 } else { 1105 return; 1106 } 1107 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, uuid128); 1108 } 1109 } 1110 1111 static void report_gatt_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){ 1112 uint8_t uuid128[16]; 1113 uint16_t uuid16 = 0; 1114 if (uuid_length == 2u){ 1115 uuid16 = little_endian_read_16(uuid, 0); 1116 uuid_add_bluetooth_prefix((uint8_t*) uuid128, uuid16); 1117 } else if (uuid_length == 16u){ 1118 reverse_128(uuid, uuid128); 1119 } else { 1120 return; 1121 } 1122 1123 if (gatt_client->filter_with_uuid && (memcmp(gatt_client->uuid128, uuid128, 16) != 0)) return; 1124 1125 gatt_client->characteristic_properties = properties; 1126 gatt_client->characteristic_start_handle = start_handle; 1127 gatt_client->attribute_handle = value_handle; 1128 1129 if (gatt_client->filter_with_uuid) return; 1130 1131 gatt_client->uuid16 = uuid16; 1132 (void)memcpy(gatt_client->uuid128, uuid128, 16); 1133 } 1134 1135 static void report_gatt_characteristic_end_found(gatt_client_t * gatt_client, uint16_t end_handle){ 1136 // TODO: stop searching if filter and uuid found 1137 1138 if (!gatt_client->characteristic_start_handle) return; 1139 1140 emit_gatt_characteristic_query_result_event(gatt_client, gatt_client->characteristic_start_handle, gatt_client->attribute_handle, 1141 end_handle, gatt_client->characteristic_properties, gatt_client->uuid128); 1142 1143 gatt_client->characteristic_start_handle = 0; 1144 } 1145 1146 1147 static void report_gatt_characteristics(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 1148 if (size < 2u) return; 1149 uint8_t attr_length = packet[1]; 1150 if ((attr_length != 7u) && (attr_length != 21u)) return; 1151 uint8_t uuid_length = attr_length - 5u; 1152 int i; 1153 for (i = 2u; (i + attr_length) <= size; i += attr_length){ 1154 uint16_t start_handle = little_endian_read_16(packet, i); 1155 uint8_t properties = packet[i+2]; 1156 uint16_t value_handle = little_endian_read_16(packet, i+3); 1157 report_gatt_characteristic_end_found(gatt_client, start_handle - 1u); 1158 report_gatt_characteristic_start_found(gatt_client, start_handle, properties, value_handle, &packet[i + 5], 1159 uuid_length); 1160 } 1161 } 1162 1163 static void report_gatt_included_service_uuid16(gatt_client_t * gatt_client, uint16_t include_handle, uint16_t uuid16){ 1164 uint8_t normalized_uuid128[16]; 1165 uuid_add_bluetooth_prefix(normalized_uuid128, uuid16); 1166 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 1167 gatt_client->query_end_handle, normalized_uuid128); 1168 } 1169 1170 static void report_gatt_included_service_uuid128(gatt_client_t * gatt_client, uint16_t include_handle, const uint8_t * uuid128){ 1171 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 1172 gatt_client->query_end_handle, uuid128); 1173 } 1174 1175 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1176 static void report_gatt_notification(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { 1177 if (!gatt_client_accept_server_message(gatt_client)) return; 1178 uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_NOTIFICATION, value_handle, 1179 value, length); 1180 emit_event_to_registered_listeners(gatt_client->con_handle, value_handle, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 1181 } 1182 1183 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1184 static void report_gatt_indication(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { 1185 if (!gatt_client_accept_server_message(gatt_client)) return; 1186 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 1187 // Directly Handle GATT Service Changed and Database Hash indications 1188 if (value_handle == gatt_client->gatt_service_database_hash_value_handle){ 1189 gatt_client_service_emit_database_hash(gatt_client, value, length); 1190 } 1191 if (value_handle == gatt_client->gatt_service_changed_value_handle){ 1192 gatt_client_service_emit_service_changed(gatt_client, value, length); 1193 } 1194 #endif 1195 uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_INDICATION, value_handle, 1196 value, length); 1197 emit_event_to_registered_listeners(gatt_client->con_handle, value_handle, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 1198 } 1199 1200 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1201 static void report_gatt_characteristic_value(gatt_client_t * gatt_client, uint16_t attribute_handle, uint8_t * value, uint16_t length){ 1202 uint8_t * packet = setup_characteristic_value_packet( 1203 gatt_client, GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT, attribute_handle, value, length); 1204 emit_event_new(gatt_client->callback, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 1205 } 1206 1207 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1208 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){ 1209 uint8_t * packet = setup_long_characteristic_value_packet(gatt_client, 1210 GATT_EVENT_LONG_CHARACTERISTIC_VALUE_QUERY_RESULT, 1211 attribute_handle, value_offset, 1212 blob, blob_length); 1213 emit_event_new(gatt_client->callback, packet, blob_length + LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE); 1214 } 1215 1216 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){ 1217 UNUSED(value_offset); 1218 uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, 1219 descriptor_handle, value, 1220 value_length); 1221 emit_event_new(gatt_client->callback, packet, value_length + 8u); 1222 } 1223 1224 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){ 1225 uint8_t * packet = setup_long_characteristic_value_packet(gatt_client, 1226 GATT_EVENT_LONG_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, 1227 descriptor_handle, value_offset, 1228 blob, blob_length); 1229 emit_event_new(gatt_client->callback, packet, blob_length + LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE); 1230 } 1231 1232 static void report_gatt_all_characteristic_descriptors(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size, uint16_t pair_size){ 1233 int i; 1234 for (i = 0u; (i + pair_size) <= size; i += pair_size){ 1235 uint16_t descriptor_handle = little_endian_read_16(packet,i); 1236 uint8_t uuid128[16]; 1237 uint16_t uuid16 = 0; 1238 if (pair_size == 4u){ 1239 uuid16 = little_endian_read_16(packet,i+2); 1240 uuid_add_bluetooth_prefix(uuid128, uuid16); 1241 } else { 1242 reverse_128(&packet[i+2], uuid128); 1243 } 1244 emit_gatt_all_characteristic_descriptors_result_event(gatt_client, descriptor_handle, uuid128); 1245 } 1246 1247 } 1248 1249 static bool is_query_done(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1250 return last_result_handle >= gatt_client->end_group_handle; 1251 } 1252 1253 static void trigger_next_query(gatt_client_t * gatt_client, uint16_t last_result_handle, gatt_client_state_t next_query_state){ 1254 if (is_query_done(gatt_client, last_result_handle)){ 1255 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1256 return; 1257 } 1258 // next 1259 gatt_client->start_group_handle = last_result_handle + 1u; 1260 gatt_client->state = next_query_state; 1261 } 1262 1263 static void trigger_next_included_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1264 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_INCLUDED_SERVICE_QUERY); 1265 } 1266 1267 static void trigger_next_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1268 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_QUERY); 1269 } 1270 1271 static void trigger_next_service_by_uuid_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1272 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_WITH_UUID_QUERY); 1273 } 1274 1275 static void trigger_next_characteristic_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1276 if (is_query_done(gatt_client, last_result_handle)){ 1277 // report last characteristic 1278 report_gatt_characteristic_end_found(gatt_client, gatt_client->end_group_handle); 1279 } 1280 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY); 1281 } 1282 1283 static void trigger_next_characteristic_descriptor_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1284 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY); 1285 } 1286 1287 static void trigger_next_read_by_type_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1288 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_READ_BY_TYPE_REQUEST); 1289 } 1290 1291 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){ 1292 gatt_client->attribute_offset += write_blob_length(gatt_client); 1293 uint16_t next_blob_length = write_blob_length(gatt_client); 1294 1295 if (next_blob_length == 0u){ 1296 gatt_client->state = done_state; 1297 return; 1298 } 1299 gatt_client->state = next_query_state; 1300 } 1301 1302 static void trigger_next_blob_query(gatt_client_t * gatt_client, gatt_client_state_t next_query_state, uint16_t received_blob_length){ 1303 1304 uint16_t max_blob_length = gatt_client->mtu - 1u; 1305 if (received_blob_length < max_blob_length){ 1306 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1307 return; 1308 } 1309 1310 gatt_client->attribute_offset += received_blob_length; 1311 gatt_client->state = next_query_state; 1312 } 1313 1314 void gatt_client_listen_for_characteristic_value_updates(gatt_client_notification_t * notification, btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 1315 notification->callback = callback; 1316 notification->con_handle = con_handle; 1317 if (characteristic == NULL){ 1318 notification->attribute_handle = GATT_CLIENT_ANY_VALUE_HANDLE; 1319 } else { 1320 notification->attribute_handle = characteristic->value_handle; 1321 } 1322 btstack_linked_list_add(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 1323 } 1324 1325 void gatt_client_stop_listening_for_characteristic_value_updates(gatt_client_notification_t * notification){ 1326 btstack_linked_list_remove(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 1327 } 1328 1329 static bool is_value_valid(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size){ 1330 uint16_t attribute_handle = little_endian_read_16(packet, 1); 1331 uint16_t value_offset = little_endian_read_16(packet, 3); 1332 1333 if (gatt_client->attribute_handle != attribute_handle) return false; 1334 if (gatt_client->attribute_offset != value_offset) return false; 1335 return memcmp(&gatt_client->attribute_value[gatt_client->attribute_offset], &packet[5], size - 5u) == 0u; 1336 } 1337 1338 #ifdef ENABLE_LE_SIGNED_WRITE 1339 static void gatt_client_run_for_client_start_signed_write(gatt_client_t *gatt_client) { 1340 sm_key_t csrk; 1341 le_device_db_local_csrk_get(gatt_client->le_device_index, csrk); 1342 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 1343 gatt_client->state = P_W4_CMAC_RESULT; 1344 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); 1345 } 1346 #endif 1347 1348 // returns true if packet was sent 1349 static bool gatt_client_run_for_gatt_client(gatt_client_t * gatt_client){ 1350 1351 // wait until re-encryption is complete 1352 if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return false; 1353 1354 // wait until re-encryption is complete 1355 if (gatt_client->reencryption_active) return false; 1356 1357 // wait until pairing complete (either reactive authentication or due to required security level) 1358 if (gatt_client->wait_for_authentication_complete) return false; 1359 1360 bool client_request_pending = gatt_client->state != P_READY; 1361 1362 // verify security level for Mandatory Authentication over LE 1363 bool check_security; 1364 switch (gatt_client->bearer_type){ 1365 case ATT_BEARER_UNENHANCED_LE: 1366 check_security = true; 1367 break; 1368 default: 1369 check_security = false; 1370 break; 1371 } 1372 if (client_request_pending && (gatt_client_required_security_level > gatt_client->security_level) && check_security){ 1373 log_info("Trigger pairing, current security level %u, required %u\n", gatt_client->security_level, gatt_client_required_security_level); 1374 gatt_client->wait_for_authentication_complete = true; 1375 // set att error code for pairing failure based on required level 1376 switch (gatt_client_required_security_level){ 1377 case LEVEL_4: 1378 case LEVEL_3: 1379 gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_AUTHENTICATION; 1380 break; 1381 default: 1382 gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_ENCRYPTION; 1383 break; 1384 } 1385 sm_request_pairing(gatt_client->con_handle); 1386 // sm probably just sent a pdu 1387 return true; 1388 } 1389 1390 switch (gatt_client->mtu_state) { 1391 case SEND_MTU_EXCHANGE: 1392 gatt_client->mtu_state = SENT_MTU_EXCHANGE; 1393 att_exchange_mtu_request(gatt_client); 1394 return true; 1395 case SENT_MTU_EXCHANGE: 1396 return false; 1397 default: 1398 break; 1399 } 1400 1401 if (gatt_client->send_confirmation){ 1402 gatt_client->send_confirmation = false; 1403 att_confirmation(gatt_client); 1404 return true; 1405 } 1406 1407 // check MTU for writes 1408 switch (gatt_client->state){ 1409 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 1410 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 1411 if (gatt_client->attribute_length <= (gatt_client->mtu - 3u)) break; 1412 log_error("gatt_client_run: value len %u > MTU %u - 3\n", gatt_client->attribute_length,gatt_client->mtu); 1413 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH); 1414 return false; 1415 default: 1416 break; 1417 } 1418 1419 bool packet_sent = true; 1420 bool done = true; 1421 switch (gatt_client->state){ 1422 case P_W2_SEND_SERVICE_QUERY: 1423 gatt_client->state = P_W4_SERVICE_QUERY_RESULT; 1424 send_gatt_services_request(gatt_client); 1425 break; 1426 1427 case P_W2_SEND_SERVICE_WITH_UUID_QUERY: 1428 gatt_client->state = P_W4_SERVICE_WITH_UUID_RESULT; 1429 send_gatt_services_by_uuid_request(gatt_client); 1430 break; 1431 1432 case P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY: 1433 gatt_client->state = P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT; 1434 send_gatt_characteristic_request(gatt_client); 1435 break; 1436 1437 case P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY: 1438 gatt_client->state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 1439 send_gatt_characteristic_request(gatt_client); 1440 break; 1441 1442 case P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY: 1443 gatt_client->state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 1444 send_gatt_characteristic_descriptor_request(gatt_client); 1445 break; 1446 1447 case P_W2_SEND_INCLUDED_SERVICE_QUERY: 1448 gatt_client->state = P_W4_INCLUDED_SERVICE_QUERY_RESULT; 1449 send_gatt_included_service_request(gatt_client); 1450 break; 1451 1452 case P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY: 1453 gatt_client->state = P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT; 1454 send_gatt_included_service_uuid_request(gatt_client); 1455 break; 1456 1457 case P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY: 1458 gatt_client->state = P_W4_READ_CHARACTERISTIC_VALUE_RESULT; 1459 send_gatt_read_characteristic_value_request(gatt_client); 1460 break; 1461 1462 case P_W2_SEND_READ_BLOB_QUERY: 1463 gatt_client->state = P_W4_READ_BLOB_RESULT; 1464 send_gatt_read_blob_request(gatt_client); 1465 break; 1466 1467 case P_W2_SEND_READ_BY_TYPE_REQUEST: 1468 gatt_client->state = P_W4_READ_BY_TYPE_RESPONSE; 1469 send_gatt_read_by_type_request(gatt_client); 1470 break; 1471 1472 case P_W2_SEND_READ_MULTIPLE_REQUEST: 1473 gatt_client->state = P_W4_READ_MULTIPLE_RESPONSE; 1474 send_gatt_read_multiple_request(gatt_client); 1475 break; 1476 1477 #ifdef ENABLE_GATT_OVER_EATT 1478 case P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST: 1479 gatt_client->state = P_W4_READ_MULTIPLE_VARIABLE_RESPONSE; 1480 send_gatt_read_multiple_variable_request(gatt_client); 1481 break; 1482 #endif 1483 1484 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 1485 gatt_client->state = P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT; 1486 send_gatt_write_attribute_value_request(gatt_client); 1487 break; 1488 1489 case P_W2_PREPARE_WRITE: 1490 gatt_client->state = P_W4_PREPARE_WRITE_RESULT; 1491 send_gatt_prepare_write_request(gatt_client); 1492 break; 1493 1494 case P_W2_PREPARE_WRITE_SINGLE: 1495 gatt_client->state = P_W4_PREPARE_WRITE_SINGLE_RESULT; 1496 send_gatt_prepare_write_request(gatt_client); 1497 break; 1498 1499 case P_W2_PREPARE_RELIABLE_WRITE: 1500 gatt_client->state = P_W4_PREPARE_RELIABLE_WRITE_RESULT; 1501 send_gatt_prepare_write_request(gatt_client); 1502 break; 1503 1504 case P_W2_EXECUTE_PREPARED_WRITE: 1505 gatt_client->state = P_W4_EXECUTE_PREPARED_WRITE_RESULT; 1506 send_gatt_execute_write_request(gatt_client); 1507 break; 1508 1509 case P_W2_CANCEL_PREPARED_WRITE: 1510 gatt_client->state = P_W4_CANCEL_PREPARED_WRITE_RESULT; 1511 send_gatt_cancel_prepared_write_request(gatt_client); 1512 break; 1513 1514 case P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH: 1515 gatt_client->state = P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT; 1516 send_gatt_cancel_prepared_write_request(gatt_client); 1517 break; 1518 1519 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1520 case P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 1521 // use Find Information 1522 gatt_client->gatt_client_state = P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1523 send_gatt_characteristic_descriptor_request(gatt_client); 1524 #else 1525 case P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 1526 // Use Read By Type 1527 gatt_client->state = P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1528 send_gatt_read_client_characteristic_configuration_request(gatt_client); 1529 #endif 1530 break; 1531 1532 case P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY: 1533 gatt_client->state = P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT; 1534 send_gatt_read_characteristic_descriptor_request(gatt_client); 1535 break; 1536 1537 case P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY: 1538 gatt_client->state = P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT; 1539 send_gatt_read_blob_request(gatt_client); 1540 break; 1541 1542 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 1543 gatt_client->state = P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1544 send_gatt_write_attribute_value_request(gatt_client); 1545 break; 1546 1547 case P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION: 1548 gatt_client->state = P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT; 1549 send_gatt_write_client_characteristic_configuration_request(gatt_client); 1550 break; 1551 1552 case P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR: 1553 gatt_client->state = P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1554 send_gatt_prepare_write_request(gatt_client); 1555 break; 1556 1557 case P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR: 1558 gatt_client->state = P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1559 send_gatt_execute_write_request(gatt_client); 1560 break; 1561 1562 #ifdef ENABLE_LE_SIGNED_WRITE 1563 case P_W4_IDENTITY_RESOLVING: 1564 log_info("P_W4_IDENTITY_RESOLVING - state %x", sm_identity_resolving_state(gatt_client->con_handle)); 1565 switch (sm_identity_resolving_state(gatt_client->con_handle)){ 1566 case IRK_LOOKUP_SUCCEEDED: 1567 gatt_client->le_device_index = sm_le_device_index(gatt_client->con_handle); 1568 gatt_client->state = P_W4_CMAC_READY; 1569 if (sm_cmac_ready()){ 1570 gatt_client_run_for_client_start_signed_write(gatt_client); 1571 } 1572 break; 1573 case IRK_LOOKUP_FAILED: 1574 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1575 break; 1576 default: 1577 break; 1578 } 1579 packet_sent = false; 1580 break; 1581 1582 case P_W4_CMAC_READY: 1583 if (sm_cmac_ready()){ 1584 gatt_client_run_for_client_start_signed_write(gatt_client); 1585 } 1586 packet_sent = false; 1587 break; 1588 1589 case P_W2_SEND_SIGNED_WRITE: { 1590 gatt_client->state = P_W4_SEND_SIGNED_WRITE_DONE; 1591 // bump local signing counter 1592 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 1593 le_device_db_local_counter_set(gatt_client->le_device_index, sign_counter + 1); 1594 // send signed write command 1595 send_gatt_signed_write_request(gatt_client, sign_counter); 1596 // finally, notifiy client that write is complete 1597 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1598 break; 1599 } 1600 #endif 1601 default: 1602 done = false; 1603 break; 1604 } 1605 1606 if (done){ 1607 return packet_sent; 1608 } 1609 1610 // write without response callback 1611 btstack_context_callback_registration_t * callback = 1612 (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->write_without_response_requests); 1613 if (callback != NULL){ 1614 (*callback->callback)(callback->context); 1615 return true; 1616 } 1617 1618 // requested can send now old 1619 if (gatt_client->write_without_response_callback != NULL){ 1620 btstack_packet_handler_t packet_handler = gatt_client->write_without_response_callback; 1621 gatt_client->write_without_response_callback = NULL; 1622 uint8_t event[4]; 1623 event[0] = GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE; 1624 event[1] = sizeof(event) - 2u; 1625 little_endian_store_16(event, 2, gatt_client->con_handle); 1626 packet_handler(HCI_EVENT_PACKET, gatt_client->con_handle, event, sizeof(event)); 1627 return true; // to trigger requeueing (even if higher layer didn't sent) 1628 } 1629 1630 return false; 1631 } 1632 1633 static void gatt_client_run(void){ 1634 btstack_linked_item_t *it; 1635 bool packet_sent; 1636 #ifdef ENABLE_GATT_OVER_EATT 1637 btstack_linked_list_iterator_t it_eatt; 1638 #endif 1639 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 1640 gatt_client_t * gatt_client = (gatt_client_t *) it; 1641 switch (gatt_client->bearer_type){ 1642 case ATT_BEARER_UNENHANCED_LE: 1643 #ifdef ENABLE_GATT_OVER_EATT 1644 btstack_linked_list_iterator_init(&it_eatt, &gatt_client->eatt_clients); 1645 while (btstack_linked_list_iterator_has_next(&it_eatt)) { 1646 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it_eatt); 1647 if (eatt_client->state != P_READY){ 1648 if (att_dispatch_client_can_send_now(gatt_client->con_handle)){ 1649 gatt_client_run_for_gatt_client(eatt_client); 1650 } 1651 } 1652 } 1653 #endif 1654 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) { 1655 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1656 return; 1657 } 1658 packet_sent = gatt_client_run_for_gatt_client(gatt_client); 1659 if (packet_sent){ 1660 // request new permission 1661 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1662 // requeue client for fairness and exit 1663 // note: iterator has become invalid 1664 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1665 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1666 return; 1667 } 1668 break; 1669 #ifdef ENABLE_GATT_OVER_CLASSIC 1670 case ATT_BEARER_UNENHANCED_CLASSIC: 1671 if (gatt_client->con_handle == HCI_CON_HANDLE_INVALID) { 1672 continue; 1673 } 1674 1675 // handle GATT over BR/EDR 1676 if (att_dispatch_client_can_send_now(gatt_client->con_handle) == false) { 1677 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1678 return; 1679 } 1680 packet_sent = gatt_client_run_for_gatt_client(gatt_client); 1681 if (packet_sent){ 1682 // request new permission 1683 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1684 // requeue client for fairness and exit 1685 // note: iterator has become invalid 1686 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1687 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1688 return; 1689 } 1690 break; 1691 #endif 1692 default: 1693 btstack_unreachable(); 1694 break; 1695 } 1696 1697 1698 } 1699 } 1700 1701 // emit complete event, used to avoid emitting event from API call 1702 static void gatt_client_emit_events(void * context){ 1703 UNUSED(context); 1704 btstack_linked_item_t *it; 1705 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next) { 1706 gatt_client_t *gatt_client = (gatt_client_t *) it; 1707 if (gatt_client->state == P_W2_EMIT_QUERY_COMPLETE_EVENT){ 1708 gatt_client->state = P_READY; 1709 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1710 } 1711 } 1712 } 1713 1714 static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code) { 1715 if (is_ready(gatt_client)) return; 1716 gatt_client_handle_transaction_complete(gatt_client, att_error_code); 1717 } 1718 1719 static void gatt_client_handle_reencryption_complete(const uint8_t * packet){ 1720 hci_con_handle_t con_handle = sm_event_reencryption_complete_get_handle(packet); 1721 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 1722 if (gatt_client == NULL) return; 1723 1724 // update security level 1725 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 1726 1727 gatt_client->reencryption_result = sm_event_reencryption_complete_get_status(packet); 1728 gatt_client->reencryption_active = false; 1729 gatt_client->wait_for_authentication_complete = false; 1730 1731 if (gatt_client->state == P_READY) return; 1732 1733 switch (sm_event_reencryption_complete_get_status(packet)){ 1734 case ERROR_CODE_SUCCESS: 1735 log_info("re-encryption success, retry operation"); 1736 break; 1737 case ERROR_CODE_AUTHENTICATION_FAILURE: 1738 case ERROR_CODE_PIN_OR_KEY_MISSING: 1739 #if defined(ENABLE_GATT_CLIENT_PAIRING) && !defined(ENABLE_LE_PROACTIVE_AUTHENTICATION) 1740 if (gatt_client_required_security_level == LEVEL_0) { 1741 // re-encryption failed for reactive authentication with pairing and we have a pending client request 1742 // => try to resolve it by deleting bonding information if we started pairing before 1743 // delete bonding information 1744 int le_device_db_index = sm_le_device_index(gatt_client->con_handle); 1745 btstack_assert(le_device_db_index >= 0); 1746 log_info("reactive auth with pairing: delete bonding and start pairing"); 1747 #ifdef ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION 1748 hci_remove_le_device_db_entry_from_resolving_list((uint16_t) le_device_db_index); 1749 #endif 1750 le_device_db_remove(le_device_db_index); 1751 // trigger pairing again 1752 sm_request_pairing(gatt_client->con_handle); 1753 break; 1754 } 1755 #endif 1756 // report bonding information missing 1757 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1758 break; 1759 default: 1760 // report bonding information missing 1761 gatt_client_handle_transaction_complete(gatt_client, gatt_client->pending_error_code); 1762 break; 1763 } 1764 } 1765 1766 static void gatt_client_handle_disconnection_complete(const uint8_t * packet){ 1767 log_info("GATT Client: HCI_EVENT_DISCONNECTION_COMPLETE"); 1768 hci_con_handle_t con_handle = little_endian_read_16(packet,3); 1769 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 1770 if (gatt_client == NULL) return; 1771 1772 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 1773 gatt_client_timeout_stop(gatt_client); 1774 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1775 btstack_memory_gatt_client_free(gatt_client); 1776 } 1777 1778 static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1779 UNUSED(channel); // ok: handling own l2cap events 1780 UNUSED(size); // ok: there is no channel 1781 1782 if (packet_type != HCI_EVENT_PACKET) return; 1783 1784 hci_con_handle_t con_handle; 1785 gatt_client_t * gatt_client; 1786 switch (hci_event_packet_get_type(packet)) { 1787 case HCI_EVENT_DISCONNECTION_COMPLETE: 1788 gatt_client_handle_disconnection_complete(packet); 1789 break; 1790 1791 // Pairing complete (with/without bonding=storing of pairing information) 1792 case SM_EVENT_PAIRING_COMPLETE: 1793 con_handle = sm_event_pairing_complete_get_handle(packet); 1794 gatt_client = gatt_client_get_context_for_handle(con_handle); 1795 if (gatt_client == NULL) break; 1796 1797 // update security level 1798 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 1799 1800 if (gatt_client->wait_for_authentication_complete){ 1801 gatt_client->wait_for_authentication_complete = false; 1802 if (sm_event_pairing_complete_get_status(packet) != ERROR_CODE_SUCCESS){ 1803 log_info("pairing failed, report previous error 0x%x", gatt_client->pending_error_code); 1804 gatt_client_report_error_if_pending(gatt_client, gatt_client->pending_error_code); 1805 } else { 1806 log_info("pairing success, retry operation"); 1807 } 1808 } 1809 break; 1810 1811 #ifdef ENABLE_LE_SIGNED_WRITE 1812 // Identity Resolving completed (no code, gatt_client_run will continue) 1813 case SM_EVENT_IDENTITY_RESOLVING_SUCCEEDED: 1814 case SM_EVENT_IDENTITY_RESOLVING_FAILED: 1815 break; 1816 #endif 1817 1818 // re-encryption started 1819 case SM_EVENT_REENCRYPTION_STARTED: 1820 con_handle = sm_event_reencryption_complete_get_handle(packet); 1821 gatt_client = gatt_client_get_context_for_handle(con_handle); 1822 if (gatt_client == NULL) break; 1823 1824 gatt_client->reencryption_active = true; 1825 gatt_client->reencryption_result = ERROR_CODE_SUCCESS; 1826 break; 1827 1828 // re-encryption complete 1829 case SM_EVENT_REENCRYPTION_COMPLETE: 1830 gatt_client_handle_reencryption_complete(packet); 1831 break; 1832 default: 1833 break; 1834 } 1835 1836 gatt_client_run(); 1837 } 1838 1839 static void gatt_client_handle_att_read_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { 1840 switch (gatt_client->state) { 1841 case P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT: 1842 if (size >= 17) { 1843 uint8_t uuid128[16]; 1844 reverse_128(&packet[1], uuid128); 1845 report_gatt_included_service_uuid128(gatt_client, gatt_client->start_group_handle, uuid128); 1846 } 1847 trigger_next_included_service_query(gatt_client, gatt_client->start_group_handle); 1848 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1849 break; 1850 1851 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 1852 report_gatt_characteristic_value(gatt_client, gatt_client->attribute_handle, &packet[1], size - 1u); 1853 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1854 break; 1855 1856 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: 1857 report_gatt_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], 1858 size - 1u, 0u); 1859 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1860 break; 1861 1862 // Use ATT_READ_REQUEST for first blob of Read Long Characteristic 1863 case P_W4_READ_BLOB_RESULT: 1864 report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], 1865 size - 1u, gatt_client->attribute_offset); 1866 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, size - 1u); 1867 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1868 break; 1869 1870 // Use ATT_READ_REQUEST for first blob of Read Long Characteristic Descriptor 1871 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 1872 report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], 1873 size - 1u, gatt_client->attribute_offset); 1874 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, 1875 size - 1u); 1876 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1877 break; 1878 1879 default: 1880 break; 1881 } 1882 } 1883 1884 static void gatt_client_handle_att_read_by_type_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { 1885 switch (gatt_client->state) { 1886 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 1887 report_gatt_characteristics(gatt_client, packet, size); 1888 trigger_next_characteristic_query(gatt_client, 1889 get_last_result_handle_from_characteristics_list(packet, size)); 1890 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1891 break; 1892 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 1893 report_gatt_characteristics(gatt_client, packet, size); 1894 trigger_next_characteristic_query(gatt_client, 1895 get_last_result_handle_from_characteristics_list(packet, size)); 1896 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1897 break; 1898 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: { 1899 if (size < 2u) break; 1900 uint16_t uuid16 = 0; 1901 uint16_t pair_size = packet[1]; 1902 1903 if (pair_size == 6u) { 1904 if (size < 8u) break; 1905 // UUIDs not available, query first included service 1906 gatt_client->start_group_handle = little_endian_read_16(packet, 2); // ready for next query 1907 gatt_client->query_start_handle = little_endian_read_16(packet, 4); 1908 gatt_client->query_end_handle = little_endian_read_16(packet, 6); 1909 gatt_client->state = P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY; 1910 break; 1911 } 1912 1913 if (pair_size != 8u) break; 1914 1915 // UUIDs included, report all of them 1916 uint16_t offset; 1917 for (offset = 2u; (offset + 8u) <= size; offset += pair_size) { 1918 uint16_t include_handle = little_endian_read_16(packet, offset); 1919 gatt_client->query_start_handle = little_endian_read_16(packet, offset + 2u); 1920 gatt_client->query_end_handle = little_endian_read_16(packet, offset + 4u); 1921 uuid16 = little_endian_read_16(packet, offset + 6u); 1922 report_gatt_included_service_uuid16(gatt_client, include_handle, uuid16); 1923 } 1924 1925 trigger_next_included_service_query(gatt_client, 1926 get_last_result_handle_from_included_services_list(packet, 1927 size)); 1928 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1929 break; 1930 } 1931 #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1932 case P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT: 1933 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, 2); 1934 gatt_client->state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 1935 break; 1936 #endif 1937 case P_W4_READ_BY_TYPE_RESPONSE: { 1938 uint16_t pair_size = packet[1]; 1939 // set last result handle to last valid handle, only used if pair_size invalid 1940 uint16_t last_result_handle = 0xffff; 1941 if (pair_size > 2) { 1942 uint16_t offset; 1943 for (offset = 2; offset < size; offset += pair_size) { 1944 uint16_t value_handle = little_endian_read_16(packet, offset); 1945 report_gatt_characteristic_value(gatt_client, value_handle, &packet[offset + 2u], 1946 pair_size - 2u); 1947 last_result_handle = value_handle; 1948 } 1949 } 1950 trigger_next_read_by_type_query(gatt_client, last_result_handle); 1951 break; 1952 } 1953 default: 1954 break; 1955 } 1956 } 1957 1958 static void gatt_client_handle_att_write_response(gatt_client_t *gatt_client) { 1959 switch (gatt_client->state) { 1960 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 1961 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1962 break; 1963 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 1964 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1965 break; 1966 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1967 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1968 break; 1969 default: 1970 break; 1971 } 1972 } 1973 1974 static void gatt_client_handle_att_response(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size) { 1975 uint8_t att_status; 1976 switch (packet[0]) { 1977 case ATT_EXCHANGE_MTU_RESPONSE: { 1978 if (size < 3u) break; 1979 bool update_gatt_server_att_mtu = false; 1980 uint16_t remote_rx_mtu = little_endian_read_16(packet, 1); 1981 uint16_t local_rx_mtu = l2cap_max_le_mtu(); 1982 switch (gatt_client->bearer_type){ 1983 case ATT_BEARER_UNENHANCED_LE: 1984 update_gatt_server_att_mtu = true; 1985 break; 1986 #ifdef ENABLE_GATT_OVER_CLASSIC 1987 case ATT_BEARER_UNENHANCED_CLASSIC: 1988 local_rx_mtu = gatt_client->mtu; 1989 break; 1990 #endif 1991 default: 1992 btstack_unreachable(); 1993 break; 1994 } 1995 1996 uint16_t mtu = (remote_rx_mtu < local_rx_mtu) ? remote_rx_mtu : local_rx_mtu; 1997 1998 // set gatt client mtu 1999 gatt_client->mtu = mtu; 2000 gatt_client->mtu_state = MTU_EXCHANGED; 2001 2002 if (update_gatt_server_att_mtu){ 2003 // set per connection mtu state - for fixed channel 2004 hci_connection_t *hci_connection = hci_connection_for_handle(gatt_client->con_handle); 2005 hci_connection->att_connection.mtu = gatt_client->mtu; 2006 hci_connection->att_connection.mtu_exchanged = true; 2007 } 2008 emit_gatt_mtu_exchanged_result_event(gatt_client, gatt_client->mtu); 2009 break; 2010 } 2011 case ATT_READ_BY_GROUP_TYPE_RESPONSE: 2012 switch (gatt_client->state) { 2013 case P_W4_SERVICE_QUERY_RESULT: 2014 report_gatt_services(gatt_client, packet, size); 2015 trigger_next_service_query(gatt_client, get_last_result_handle_from_service_list(packet, size)); 2016 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2017 break; 2018 default: 2019 break; 2020 } 2021 break; 2022 case ATT_HANDLE_VALUE_NOTIFICATION: 2023 if (size < 3u) return; 2024 report_gatt_notification(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); 2025 return; 2026 #ifdef ENABLE_GATT_OVER_EATT 2027 case ATT_MULTIPLE_HANDLE_VALUE_NTF: 2028 if (size >= 5u) { 2029 uint16_t offset = 1; 2030 while (true){ 2031 uint16_t value_handle = little_endian_read_16(packet, offset); 2032 offset += 2; 2033 uint16_t value_length = little_endian_read_16(packet, offset); 2034 offset += 2; 2035 if ((offset + value_length) > size) break; 2036 report_gatt_notification(gatt_client, value_handle, &packet[offset], value_length); 2037 offset += value_length; 2038 } 2039 } 2040 return; 2041 #endif 2042 case ATT_HANDLE_VALUE_INDICATION: 2043 if (size < 3u) break; 2044 report_gatt_indication(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); 2045 gatt_client->send_confirmation = true; 2046 break; 2047 case ATT_READ_BY_TYPE_RESPONSE: 2048 gatt_client_handle_att_read_by_type_response(gatt_client, packet, size); 2049 break; 2050 case ATT_READ_RESPONSE: 2051 gatt_client_handle_att_read_response(gatt_client, packet, size); 2052 break; 2053 case ATT_FIND_BY_TYPE_VALUE_RESPONSE: { 2054 uint8_t pair_size = 4; 2055 int i; 2056 uint16_t start_group_handle; 2057 uint16_t end_group_handle = 0xffff; // asserts GATT_EVENT_QUERY_COMPLETE is emitted if no results 2058 for (i = 1u; (i + pair_size) <= size; i += pair_size) { 2059 start_group_handle = little_endian_read_16(packet, i); 2060 end_group_handle = little_endian_read_16(packet, i + 2); 2061 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, 2062 gatt_client->uuid128); 2063 } 2064 trigger_next_service_by_uuid_query(gatt_client, end_group_handle); 2065 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2066 break; 2067 } 2068 case ATT_FIND_INFORMATION_REPLY: { 2069 if (size < 2u) break; 2070 2071 uint8_t pair_size = 4; 2072 if (packet[1u] == 2u) { 2073 pair_size = 18; 2074 } 2075 uint16_t offset = 2; 2076 2077 if (size < (pair_size + offset)) break; 2078 uint16_t last_descriptor_handle = little_endian_read_16(packet, size - pair_size); 2079 2080 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 2081 log_info("ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY, state %x", gatt_client->gatt_client_state); 2082 if (gatt_client->gatt_client_state == P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT){ 2083 // iterate over descriptors looking for CCC 2084 if (pair_size == 4){ 2085 while ((offset + 4) <= size){ 2086 uint16_t uuid16 = little_endian_read_16(packet, offset + 2); 2087 if (uuid16 == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION){ 2088 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, offset); 2089 gatt_client->gatt_client_state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 2090 log_info("CCC found %x", gatt_client->client_characteristic_configuration_handle); 2091 break; 2092 } 2093 offset += pair_size; 2094 } 2095 } 2096 if (is_query_done(gatt_client, last_descriptor_handle)){ 2097 2098 } else { 2099 // next 2100 gatt_client->start_group_handle = last_descriptor_handle + 1; 2101 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2102 } 2103 break; 2104 } 2105 #endif 2106 report_gatt_all_characteristic_descriptors(gatt_client, &packet[2], size - 2u, pair_size); 2107 trigger_next_characteristic_descriptor_query(gatt_client, last_descriptor_handle); 2108 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2109 break; 2110 } 2111 2112 case ATT_WRITE_RESPONSE: 2113 gatt_client_handle_att_write_response(gatt_client); 2114 break; 2115 2116 case ATT_READ_BLOB_RESPONSE: { 2117 uint16_t received_blob_length = size - 1u; 2118 switch (gatt_client->state) { 2119 case P_W4_READ_BLOB_RESULT: 2120 report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], 2121 received_blob_length, gatt_client->attribute_offset); 2122 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, received_blob_length); 2123 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2124 break; 2125 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 2126 report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, 2127 &packet[1], received_blob_length, 2128 gatt_client->attribute_offset); 2129 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, 2130 received_blob_length); 2131 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2132 break; 2133 default: 2134 break; 2135 } 2136 break; 2137 } 2138 case ATT_PREPARE_WRITE_RESPONSE: 2139 switch (gatt_client->state) { 2140 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 2141 if (is_value_valid(gatt_client, packet, size)) { 2142 att_status = ATT_ERROR_SUCCESS; 2143 } else { 2144 att_status = ATT_ERROR_DATA_MISMATCH; 2145 } 2146 gatt_client_handle_transaction_complete(gatt_client, att_status); 2147 break; 2148 2149 case P_W4_PREPARE_WRITE_RESULT: { 2150 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 2151 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE, P_W2_EXECUTE_PREPARED_WRITE); 2152 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2153 break; 2154 } 2155 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: { 2156 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 2157 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR, 2158 P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR); 2159 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2160 break; 2161 } 2162 case P_W4_PREPARE_RELIABLE_WRITE_RESULT: { 2163 if (is_value_valid(gatt_client, packet, size)) { 2164 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 2165 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_RELIABLE_WRITE, 2166 P_W2_EXECUTE_PREPARED_WRITE); 2167 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2168 break; 2169 } 2170 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 2171 break; 2172 } 2173 default: 2174 break; 2175 } 2176 break; 2177 2178 case ATT_EXECUTE_WRITE_RESPONSE: 2179 switch (gatt_client->state) { 2180 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 2181 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2182 break; 2183 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 2184 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2185 break; 2186 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 2187 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_DATA_MISMATCH); 2188 break; 2189 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2190 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2191 break; 2192 default: 2193 break; 2194 2195 } 2196 break; 2197 2198 case ATT_READ_MULTIPLE_RESPONSE: 2199 switch (gatt_client->state) { 2200 case P_W4_READ_MULTIPLE_RESPONSE: 2201 report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); 2202 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2203 break; 2204 default: 2205 break; 2206 } 2207 break; 2208 2209 #ifdef ENABLE_GATT_OVER_EATT 2210 case ATT_READ_MULTIPLE_VARIABLE_RSP: 2211 switch (gatt_client->state) { 2212 case P_W4_READ_MULTIPLE_VARIABLE_RESPONSE: 2213 report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); 2214 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2215 break; 2216 default: 2217 break; 2218 } 2219 break; 2220 #endif 2221 2222 case ATT_ERROR_RESPONSE: 2223 if (size < 5u) return; 2224 att_status = packet[4]; 2225 switch (att_status) { 2226 case ATT_ERROR_ATTRIBUTE_NOT_FOUND: { 2227 switch (gatt_client->state) { 2228 case P_W4_SERVICE_QUERY_RESULT: 2229 case P_W4_SERVICE_WITH_UUID_RESULT: 2230 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: 2231 case P_W4_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT: 2232 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2233 break; 2234 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 2235 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 2236 report_gatt_characteristic_end_found(gatt_client, gatt_client->end_group_handle); 2237 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2238 break; 2239 case P_W4_READ_BY_TYPE_RESPONSE: 2240 if (gatt_client->start_group_handle == gatt_client->query_start_handle) { 2241 att_status = ATT_ERROR_ATTRIBUTE_NOT_FOUND; 2242 } else { 2243 att_status = ATT_ERROR_SUCCESS; 2244 } 2245 gatt_client_handle_transaction_complete(gatt_client, att_status); 2246 break; 2247 default: 2248 gatt_client_report_error_if_pending(gatt_client, att_status); 2249 break; 2250 } 2251 break; 2252 } 2253 2254 #ifdef ENABLE_GATT_CLIENT_PAIRING 2255 2256 case ATT_ERROR_INSUFFICIENT_AUTHENTICATION: 2257 case ATT_ERROR_INSUFFICIENT_ENCRYPTION_KEY_SIZE: 2258 case ATT_ERROR_INSUFFICIENT_ENCRYPTION: { 2259 2260 // security too low 2261 if (gatt_client->security_counter > 0) { 2262 gatt_client_report_error_if_pending(gatt_client, att_status); 2263 break; 2264 } 2265 // start security 2266 gatt_client->security_counter++; 2267 2268 // setup action 2269 int retry = 1; 2270 switch (gatt_client->state){ 2271 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 2272 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY ; 2273 break; 2274 case P_W4_READ_BLOB_RESULT: 2275 gatt_client->state = P_W2_SEND_READ_BLOB_QUERY; 2276 break; 2277 case P_W4_READ_BY_TYPE_RESPONSE: 2278 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2279 break; 2280 case P_W4_READ_MULTIPLE_RESPONSE: 2281 gatt_client->state = P_W2_SEND_READ_MULTIPLE_REQUEST; 2282 break; 2283 case P_W4_READ_MULTIPLE_VARIABLE_RESPONSE: 2284 gatt_client->state = P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST; 2285 break; 2286 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 2287 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 2288 break; 2289 case P_W4_PREPARE_WRITE_RESULT: 2290 gatt_client->state = P_W2_PREPARE_WRITE; 2291 break; 2292 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 2293 gatt_client->state = P_W2_PREPARE_WRITE_SINGLE; 2294 break; 2295 case P_W4_PREPARE_RELIABLE_WRITE_RESULT: 2296 gatt_client->state = P_W2_PREPARE_RELIABLE_WRITE; 2297 break; 2298 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 2299 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE; 2300 break; 2301 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 2302 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE; 2303 break; 2304 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 2305 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 2306 break; 2307 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: 2308 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 2309 break; 2310 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 2311 gatt_client->state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 2312 break; 2313 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2314 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 2315 break; 2316 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 2317 gatt_client->state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 2318 break; 2319 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2320 gatt_client->state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 2321 break; 2322 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2323 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR; 2324 break; 2325 #ifdef ENABLE_LE_SIGNED_WRITE 2326 case P_W4_SEND_SIGNED_WRITE_DONE: 2327 gatt_client->state = P_W2_SEND_SIGNED_WRITE; 2328 break; 2329 #endif 2330 default: 2331 log_info("retry not supported for state %x", gatt_client->state); 2332 retry = 0; 2333 break; 2334 } 2335 2336 if (!retry) { 2337 gatt_client_report_error_if_pending(gatt_client, att_status); 2338 break; 2339 } 2340 2341 log_info("security error, start pairing"); 2342 2343 // start pairing for higher security level 2344 gatt_client->wait_for_authentication_complete = true; 2345 gatt_client->pending_error_code = att_status; 2346 sm_request_pairing(gatt_client->con_handle); 2347 break; 2348 } 2349 #endif 2350 2351 // nothing we can do about that 2352 case ATT_ERROR_INSUFFICIENT_AUTHORIZATION: 2353 default: 2354 gatt_client_report_error_if_pending(gatt_client, att_status); 2355 break; 2356 } 2357 break; 2358 2359 default: 2360 log_info("ATT Handler, unhandled response type 0x%02x", packet[0]); 2361 break; 2362 } 2363 } 2364 2365 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size) { 2366 gatt_client_t *gatt_client; 2367 #ifdef ENABLE_GATT_OVER_CLASSIC 2368 uint8_t status; 2369 hci_connection_t * hci_connection; 2370 hci_con_handle_t con_handle; 2371 #endif 2372 2373 if (size < 1u) return; 2374 switch (packet_type){ 2375 case HCI_EVENT_PACKET: 2376 switch (hci_event_packet_get_type(packet)) { 2377 #ifdef ENABLE_GATT_OVER_CLASSIC 2378 case L2CAP_EVENT_CHANNEL_OPENED: 2379 status = l2cap_event_channel_opened_get_status(packet); 2380 gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_opened_get_local_cid(packet)); 2381 if (gatt_client != NULL){ 2382 con_handle = l2cap_event_channel_opened_get_handle(packet); 2383 hci_connection = hci_connection_for_handle(con_handle); 2384 if (status == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_RESOURCES){ 2385 if ((hci_connection != NULL) && hci_connection->att_server.incoming_connection_request) { 2386 log_info("Collision, retry in 100ms"); 2387 gatt_client->state = P_W2_L2CAP_CONNECT; 2388 // set timer for retry 2389 btstack_run_loop_set_timer(&gatt_client->gc_timeout, GATT_CLIENT_COLLISION_BACKOFF_MS); 2390 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_classic_retry); 2391 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 2392 break; 2393 } 2394 } 2395 // if status != 0, gatt_client will be discarded 2396 gatt_client->state = P_READY; 2397 gatt_client->con_handle = l2cap_event_channel_opened_get_handle(packet); 2398 gatt_client->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); 2399 gatt_client_classic_handle_connected(gatt_client, status); 2400 } 2401 break; 2402 case L2CAP_EVENT_CHANNEL_CLOSED: 2403 gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_closed_get_local_cid(packet)); 2404 if (gatt_client != NULL){ 2405 // discard gatt client object 2406 gatt_client_classic_handle_disconnected(gatt_client); 2407 } 2408 break; 2409 #endif 2410 case L2CAP_EVENT_CAN_SEND_NOW: 2411 gatt_client_run(); 2412 break; 2413 // att_server has negotiated the mtu for this connection, cache if context exists 2414 case ATT_EVENT_MTU_EXCHANGE_COMPLETE: 2415 if (size < 6u) break; 2416 gatt_client = gatt_client_get_context_for_handle(handle); 2417 if (gatt_client != NULL) { 2418 gatt_client->mtu = little_endian_read_16(packet, 4); 2419 } 2420 break; 2421 default: 2422 break; 2423 } 2424 break; 2425 2426 case ATT_DATA_PACKET: 2427 // special cases: notifications & indications motivate creating context 2428 switch (packet[0]) { 2429 case ATT_HANDLE_VALUE_NOTIFICATION: 2430 case ATT_HANDLE_VALUE_INDICATION: 2431 gatt_client_provide_context_for_handle(handle, &gatt_client); 2432 break; 2433 default: 2434 gatt_client = gatt_client_get_context_for_handle(handle); 2435 break; 2436 } 2437 2438 if (gatt_client != NULL) { 2439 gatt_client_handle_att_response(gatt_client, packet, size); 2440 gatt_client_run(); 2441 } 2442 break; 2443 2444 #ifdef ENABLE_GATT_OVER_CLASSIC 2445 case L2CAP_DATA_PACKET: 2446 gatt_client = gatt_client_get_context_for_l2cap_cid(handle); 2447 if (gatt_client != NULL){ 2448 gatt_client_handle_att_response(gatt_client, packet, size); 2449 gatt_client_run(); 2450 } 2451 break; 2452 #endif 2453 2454 default: 2455 break; 2456 } 2457 } 2458 2459 #ifdef ENABLE_LE_SIGNED_WRITE 2460 static void att_signed_write_handle_cmac_result(uint8_t hash[8]){ 2461 btstack_linked_list_iterator_t it; 2462 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 2463 while (btstack_linked_list_iterator_has_next(&it)){ 2464 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 2465 if (gatt_client->state == P_W4_CMAC_RESULT){ 2466 // store result 2467 (void)memcpy(gatt_client->cmac, hash, 8); 2468 // reverse_64(hash, gatt_client->cmac); 2469 gatt_client->state = P_W2_SEND_SIGNED_WRITE; 2470 gatt_client_run(); 2471 return; 2472 } 2473 } 2474 } 2475 2476 uint8_t gatt_client_signed_write_without_response(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t message_len, uint8_t * message){ 2477 gatt_client_t * gatt_client; 2478 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2479 if (status != ERROR_CODE_SUCCESS){ 2480 return status; 2481 } 2482 if (is_ready(gatt_client) == 0){ 2483 return GATT_CLIENT_IN_WRONG_STATE; 2484 } 2485 2486 gatt_client->callback = callback; 2487 gatt_client->attribute_handle = value_handle; 2488 gatt_client->attribute_length = message_len; 2489 gatt_client->attribute_value = message; 2490 gatt_client->state = P_W4_IDENTITY_RESOLVING; 2491 gatt_client_run(); 2492 return ERROR_CODE_SUCCESS; 2493 } 2494 #endif 2495 2496 uint8_t gatt_client_discover_primary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2497 gatt_client_t * gatt_client; 2498 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2499 if (status != ERROR_CODE_SUCCESS){ 2500 return status; 2501 } 2502 2503 gatt_client->callback = callback; 2504 gatt_client->start_group_handle = 0x0001; 2505 gatt_client->end_group_handle = 0xffff; 2506 gatt_client->state = P_W2_SEND_SERVICE_QUERY; 2507 gatt_client->uuid16 = GATT_PRIMARY_SERVICE_UUID; 2508 gatt_client_run(); 2509 return ERROR_CODE_SUCCESS; 2510 } 2511 2512 uint8_t gatt_client_discover_secondary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2513 gatt_client_t * gatt_client; 2514 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2515 if (status != ERROR_CODE_SUCCESS){ 2516 return status; 2517 } 2518 2519 gatt_client->callback = callback; 2520 gatt_client->start_group_handle = 0x0001; 2521 gatt_client->end_group_handle = 0xffff; 2522 gatt_client->state = P_W2_SEND_SERVICE_QUERY; 2523 gatt_client->uuid16 = GATT_SECONDARY_SERVICE_UUID; 2524 gatt_client_run(); 2525 return ERROR_CODE_SUCCESS; 2526 } 2527 2528 uint8_t gatt_client_discover_primary_services_by_uuid16_with_context(btstack_packet_handler_t callback, hci_con_handle_t con_handle, 2529 uint16_t uuid16, uint16_t service_id, uint16_t connection_id){ 2530 gatt_client_t * gatt_client; 2531 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2532 if (status != ERROR_CODE_SUCCESS){ 2533 return status; 2534 } 2535 2536 gatt_client->callback = callback; 2537 gatt_client->service_id = service_id; 2538 gatt_client->connection_id = connection_id; 2539 gatt_client->start_group_handle = 0x0001; 2540 gatt_client->end_group_handle = 0xffff; 2541 gatt_client->state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 2542 gatt_client->uuid16 = uuid16; 2543 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), gatt_client->uuid16); 2544 gatt_client_run(); 2545 return ERROR_CODE_SUCCESS; 2546 } 2547 2548 uint8_t gatt_client_discover_primary_services_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t uuid16){ 2549 return gatt_client_discover_primary_services_by_uuid16_with_context(callback, con_handle, uuid16, 0, 0); 2550 } 2551 2552 uint8_t gatt_client_discover_primary_services_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, const uint8_t * uuid128){ 2553 gatt_client_t * gatt_client; 2554 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2555 if (status != ERROR_CODE_SUCCESS){ 2556 return status; 2557 } 2558 2559 gatt_client->callback = callback; 2560 gatt_client->start_group_handle = 0x0001; 2561 gatt_client->end_group_handle = 0xffff; 2562 gatt_client->uuid16 = 0; 2563 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2564 gatt_client->state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 2565 gatt_client_run(); 2566 return ERROR_CODE_SUCCESS; 2567 } 2568 2569 uint8_t gatt_client_discover_characteristics_for_service_with_context(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service, 2570 uint16_t service_id, uint16_t connection_id){ 2571 gatt_client_t * gatt_client; 2572 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2573 if (status != ERROR_CODE_SUCCESS){ 2574 return status; 2575 } 2576 2577 gatt_client->callback = callback; 2578 gatt_client->service_id = service_id; 2579 gatt_client->connection_id = connection_id; 2580 gatt_client->start_group_handle = service->start_group_handle; 2581 gatt_client->end_group_handle = service->end_group_handle; 2582 gatt_client->filter_with_uuid = false; 2583 gatt_client->characteristic_start_handle = 0; 2584 gatt_client->state = P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY; 2585 gatt_client_run(); 2586 return ERROR_CODE_SUCCESS; 2587 } 2588 2589 uint8_t gatt_client_discover_characteristics_for_service(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service){ 2590 return gatt_client_discover_characteristics_for_service_with_context(callback, con_handle, service, 0, 0); 2591 } 2592 2593 uint8_t gatt_client_find_included_services_for_service_with_context(btstack_packet_handler_t callback, hci_con_handle_t con_handle, 2594 gatt_client_service_t * service, uint16_t service_id, uint16_t connection_id){ 2595 gatt_client_t * gatt_client; 2596 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2597 if (status != ERROR_CODE_SUCCESS){ 2598 return status; 2599 } 2600 2601 gatt_client->callback = callback; 2602 gatt_client->service_id = service_id; 2603 gatt_client->connection_id = connection_id; 2604 gatt_client->start_group_handle = service->start_group_handle; 2605 gatt_client->end_group_handle = service->end_group_handle; 2606 gatt_client->state = P_W2_SEND_INCLUDED_SERVICE_QUERY; 2607 2608 gatt_client_run(); 2609 return ERROR_CODE_SUCCESS; 2610 } 2611 2612 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) { 2613 return gatt_client_find_included_services_for_service_with_context(callback, con_handle, service, 0, 0); 2614 } 2615 2616 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){ 2617 gatt_client_t * gatt_client; 2618 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2619 if (status != ERROR_CODE_SUCCESS){ 2620 return status; 2621 } 2622 2623 gatt_client->callback = callback; 2624 gatt_client->start_group_handle = start_handle; 2625 gatt_client->end_group_handle = end_handle; 2626 gatt_client->filter_with_uuid = true; 2627 gatt_client->uuid16 = uuid16; 2628 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 2629 gatt_client->characteristic_start_handle = 0; 2630 gatt_client->state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 2631 gatt_client_run(); 2632 return ERROR_CODE_SUCCESS; 2633 } 2634 2635 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, const uint8_t * uuid128){ 2636 gatt_client_t * gatt_client; 2637 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2638 if (status != ERROR_CODE_SUCCESS){ 2639 return status; 2640 } 2641 2642 gatt_client->callback = callback; 2643 gatt_client->start_group_handle = start_handle; 2644 gatt_client->end_group_handle = end_handle; 2645 gatt_client->filter_with_uuid = true; 2646 gatt_client->uuid16 = 0; 2647 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2648 gatt_client->characteristic_start_handle = 0; 2649 gatt_client->state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 2650 gatt_client_run(); 2651 return ERROR_CODE_SUCCESS; 2652 } 2653 2654 2655 uint8_t gatt_client_discover_characteristics_for_service_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service, uint16_t uuid16){ 2656 return gatt_client_discover_characteristics_for_handle_range_by_uuid16(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid16); 2657 } 2658 2659 uint8_t gatt_client_discover_characteristics_for_service_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service, const uint8_t * uuid128){ 2660 return gatt_client_discover_characteristics_for_handle_range_by_uuid128(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid128); 2661 } 2662 2663 uint8_t gatt_client_discover_characteristic_descriptors_with_context(btstack_packet_handler_t callback, hci_con_handle_t con_handle, 2664 gatt_client_characteristic_t * characteristic, uint16_t service_id, uint16_t connection_id){ 2665 gatt_client_t * gatt_client; 2666 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2667 if (status != ERROR_CODE_SUCCESS){ 2668 return status; 2669 } 2670 2671 gatt_client->service_id = service_id; 2672 gatt_client->connection_id = connection_id; 2673 2674 // check if there is space for characteristics descriptors 2675 if (characteristic->end_handle > characteristic->value_handle){ 2676 gatt_client->callback = callback; 2677 gatt_client->start_group_handle = characteristic->value_handle + 1u; 2678 gatt_client->end_group_handle = characteristic->end_handle; 2679 gatt_client->state = P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY; 2680 gatt_client_run(); 2681 } else { 2682 // schedule gatt complete event on next run loop iteration otherwise 2683 gatt_client->state = P_W2_EMIT_QUERY_COMPLETE_EVENT; 2684 gatt_client_deferred_event_emit.callback = gatt_client_emit_events; 2685 btstack_run_loop_execute_on_main_thread(&gatt_client_deferred_event_emit); 2686 } 2687 return ERROR_CODE_SUCCESS; 2688 } 2689 2690 uint8_t gatt_client_discover_characteristic_descriptors(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 2691 return gatt_client_discover_characteristic_descriptors_with_context(callback, con_handle, characteristic, 0, 0); 2692 } 2693 2694 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){ 2695 gatt_client_t * gatt_client; 2696 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2697 if (status != ERROR_CODE_SUCCESS){ 2698 return status; 2699 } 2700 2701 gatt_client->callback = callback; 2702 gatt_client->attribute_handle = value_handle; 2703 gatt_client->attribute_offset = 0; 2704 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY; 2705 gatt_client_run(); 2706 return ERROR_CODE_SUCCESS; 2707 } 2708 2709 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){ 2710 gatt_client_t * gatt_client; 2711 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2712 if (status != ERROR_CODE_SUCCESS){ 2713 return status; 2714 } 2715 2716 gatt_client->callback = callback; 2717 gatt_client->start_group_handle = start_handle; 2718 gatt_client->end_group_handle = end_handle; 2719 gatt_client->query_start_handle = start_handle; 2720 gatt_client->query_end_handle = end_handle; 2721 gatt_client->uuid16 = uuid16; 2722 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 2723 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2724 gatt_client_run(); 2725 return ERROR_CODE_SUCCESS; 2726 } 2727 2728 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, const uint8_t * uuid128){ 2729 gatt_client_t * gatt_client; 2730 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2731 if (status != ERROR_CODE_SUCCESS){ 2732 return status; 2733 } 2734 2735 gatt_client->callback = callback; 2736 gatt_client->start_group_handle = start_handle; 2737 gatt_client->end_group_handle = end_handle; 2738 gatt_client->query_start_handle = start_handle; 2739 gatt_client->query_end_handle = end_handle; 2740 gatt_client->uuid16 = 0; 2741 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2742 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2743 gatt_client_run(); 2744 return ERROR_CODE_SUCCESS; 2745 } 2746 2747 2748 uint8_t gatt_client_read_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 2749 return gatt_client_read_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); 2750 } 2751 2752 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 value_handle, uint16_t offset){ 2753 gatt_client_t * gatt_client; 2754 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2755 if (status != ERROR_CODE_SUCCESS){ 2756 return status; 2757 } 2758 2759 gatt_client->callback = callback; 2760 gatt_client->attribute_handle = value_handle; 2761 gatt_client->attribute_offset = offset; 2762 gatt_client->state = P_W2_SEND_READ_BLOB_QUERY; 2763 gatt_client_run(); 2764 return ERROR_CODE_SUCCESS; 2765 } 2766 2767 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 value_handle){ 2768 return gatt_client_read_long_value_of_characteristic_using_value_handle_with_offset(callback, con_handle, value_handle, 0); 2769 } 2770 2771 uint8_t gatt_client_read_long_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 2772 return gatt_client_read_long_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); 2773 } 2774 2775 static uint8_t gatt_client_read_multiple_characteristic_values_with_state(btstack_packet_handler_t callback, hci_con_handle_t con_handle, int num_value_handles, uint16_t * value_handles, gatt_client_state_t state){ 2776 gatt_client_t * gatt_client; 2777 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2778 if (status != ERROR_CODE_SUCCESS){ 2779 return status; 2780 } 2781 2782 #ifdef ENABLE_GATT_OVER_EATT 2783 if (state == P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST){ 2784 if (gatt_client->bearer_type != ATT_BEARER_ENHANCED_LE){ 2785 return ERROR_CODE_COMMAND_DISALLOWED; 2786 } 2787 } 2788 #endif 2789 2790 gatt_client->callback = callback; 2791 gatt_client->read_multiple_handle_count = num_value_handles; 2792 gatt_client->read_multiple_handles = value_handles; 2793 gatt_client->state = state; 2794 gatt_client_run(); 2795 return ERROR_CODE_SUCCESS; 2796 } 2797 2798 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){ 2799 return gatt_client_read_multiple_characteristic_values_with_state(callback, con_handle, num_value_handles, value_handles, P_W2_SEND_READ_MULTIPLE_REQUEST); 2800 } 2801 2802 #ifdef ENABLE_GATT_OVER_EATT 2803 uint8_t gatt_client_read_multiple_variable_characteristic_values(btstack_packet_handler_t callback, hci_con_handle_t con_handle, int num_value_handles, uint16_t * value_handles){ 2804 return gatt_client_read_multiple_characteristic_values_with_state(callback, con_handle, num_value_handles, value_handles, P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST); 2805 } 2806 #endif 2807 2808 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){ 2809 gatt_client_t * gatt_client; 2810 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2811 if (status != ERROR_CODE_SUCCESS){ 2812 return status; 2813 } 2814 2815 if (value_length > (gatt_client->mtu - 3u)) return GATT_CLIENT_VALUE_TOO_LONG; 2816 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) return GATT_CLIENT_BUSY; 2817 2818 return att_write_request(gatt_client, ATT_WRITE_COMMAND, value_handle, value_length, value); 2819 } 2820 2821 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 * value){ 2822 gatt_client_t * gatt_client; 2823 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2824 if (status != ERROR_CODE_SUCCESS){ 2825 return status; 2826 } 2827 2828 gatt_client->callback = callback; 2829 gatt_client->attribute_handle = value_handle; 2830 gatt_client->attribute_length = value_length; 2831 gatt_client->attribute_value = value; 2832 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 2833 gatt_client_run(); 2834 return ERROR_CODE_SUCCESS; 2835 } 2836 2837 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 * value){ 2838 gatt_client_t * gatt_client; 2839 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2840 if (status != ERROR_CODE_SUCCESS){ 2841 return status; 2842 } 2843 2844 gatt_client->callback = callback; 2845 gatt_client->attribute_handle = value_handle; 2846 gatt_client->attribute_length = value_length; 2847 gatt_client->attribute_offset = offset; 2848 gatt_client->attribute_value = value; 2849 gatt_client->state = P_W2_PREPARE_WRITE; 2850 gatt_client_run(); 2851 return ERROR_CODE_SUCCESS; 2852 } 2853 2854 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){ 2855 return gatt_client_write_long_value_of_characteristic_with_offset(callback, con_handle, value_handle, 0, value_length, value); 2856 } 2857 2858 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){ 2859 gatt_client_t * gatt_client; 2860 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2861 if (status != ERROR_CODE_SUCCESS){ 2862 return status; 2863 } 2864 2865 gatt_client->callback = callback; 2866 gatt_client->attribute_handle = value_handle; 2867 gatt_client->attribute_length = value_length; 2868 gatt_client->attribute_offset = 0; 2869 gatt_client->attribute_value = value; 2870 gatt_client->state = P_W2_PREPARE_RELIABLE_WRITE; 2871 gatt_client_run(); 2872 return ERROR_CODE_SUCCESS; 2873 } 2874 2875 uint8_t gatt_client_write_client_characteristic_configuration_with_context(btstack_packet_handler_t callback, hci_con_handle_t con_handle, 2876 gatt_client_characteristic_t * characteristic, uint16_t configuration, uint16_t service_id, uint16_t connection_id){ 2877 gatt_client_t * gatt_client; 2878 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2879 if (status != ERROR_CODE_SUCCESS){ 2880 return status; 2881 } 2882 2883 if (configuration > 3){ 2884 return ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE; 2885 } 2886 2887 if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION) && 2888 ((characteristic->properties & ATT_PROPERTY_NOTIFY) == 0u)) { 2889 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED"); 2890 return GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED; 2891 } else if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION) && 2892 ((characteristic->properties & ATT_PROPERTY_INDICATE) == 0u)){ 2893 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED"); 2894 return GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED; 2895 } 2896 2897 gatt_client->callback = callback; 2898 gatt_client->service_id = service_id; 2899 gatt_client->connection_id = connection_id; 2900 gatt_client->start_group_handle = characteristic->value_handle; 2901 gatt_client->end_group_handle = characteristic->end_handle; 2902 little_endian_store_16(gatt_client->client_characteristic_configuration_value, 0, configuration); 2903 2904 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 2905 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2906 #else 2907 gatt_client->state = P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2908 #endif 2909 gatt_client_run(); 2910 return ERROR_CODE_SUCCESS; 2911 } 2912 2913 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){ 2914 return gatt_client_write_client_characteristic_configuration_with_context(callback, con_handle, characteristic, configuration, 0, 0); 2915 } 2916 2917 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){ 2918 gatt_client_t * gatt_client; 2919 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2920 if (status != ERROR_CODE_SUCCESS){ 2921 return status; 2922 } 2923 2924 gatt_client->callback = callback; 2925 gatt_client->attribute_handle = descriptor_handle; 2926 2927 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 2928 gatt_client_run(); 2929 return ERROR_CODE_SUCCESS; 2930 } 2931 2932 uint8_t gatt_client_read_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor){ 2933 return gatt_client_read_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2934 } 2935 2936 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){ 2937 gatt_client_t * gatt_client; 2938 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2939 if (status != ERROR_CODE_SUCCESS){ 2940 return status; 2941 } 2942 2943 gatt_client->callback = callback; 2944 gatt_client->attribute_handle = descriptor_handle; 2945 gatt_client->attribute_offset = offset; 2946 gatt_client->state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 2947 gatt_client_run(); 2948 return ERROR_CODE_SUCCESS; 2949 } 2950 2951 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){ 2952 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0); 2953 } 2954 2955 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){ 2956 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2957 } 2958 2959 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 value_length, uint8_t * value){ 2960 gatt_client_t * gatt_client; 2961 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2962 if (status != ERROR_CODE_SUCCESS){ 2963 return status; 2964 } 2965 2966 gatt_client->callback = callback; 2967 gatt_client->attribute_handle = descriptor_handle; 2968 gatt_client->attribute_length = value_length; 2969 gatt_client->attribute_offset = 0; 2970 gatt_client->attribute_value = value; 2971 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 2972 gatt_client_run(); 2973 return ERROR_CODE_SUCCESS; 2974 } 2975 2976 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 value_length, uint8_t * value){ 2977 return gatt_client_write_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); 2978 } 2979 2980 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 value_length, uint8_t * value){ 2981 gatt_client_t * gatt_client; 2982 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2983 if (status != ERROR_CODE_SUCCESS){ 2984 return status; 2985 } 2986 2987 gatt_client->callback = callback; 2988 gatt_client->attribute_handle = descriptor_handle; 2989 gatt_client->attribute_length = value_length; 2990 gatt_client->attribute_offset = offset; 2991 gatt_client->attribute_value = value; 2992 gatt_client->state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 2993 gatt_client_run(); 2994 return ERROR_CODE_SUCCESS; 2995 } 2996 2997 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 value_length, uint8_t * value){ 2998 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0, value_length, value); 2999 } 3000 3001 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 value_length, uint8_t * value){ 3002 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); 3003 } 3004 3005 /** 3006 * @brief -> gatt complete event 3007 */ 3008 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 value_length, uint8_t * value){ 3009 gatt_client_t * gatt_client; 3010 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 3011 if (status != ERROR_CODE_SUCCESS){ 3012 return status; 3013 } 3014 3015 gatt_client->callback = callback; 3016 gatt_client->attribute_handle = attribute_handle; 3017 gatt_client->attribute_length = value_length; 3018 gatt_client->attribute_offset = offset; 3019 gatt_client->attribute_value = value; 3020 gatt_client->state = P_W2_PREPARE_WRITE_SINGLE; 3021 gatt_client_run(); 3022 return ERROR_CODE_SUCCESS; 3023 } 3024 3025 /** 3026 * @brief -> gatt complete event 3027 */ 3028 uint8_t gatt_client_execute_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3029 gatt_client_t * gatt_client; 3030 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 3031 if (status != ERROR_CODE_SUCCESS){ 3032 return status; 3033 } 3034 3035 gatt_client->callback = callback; 3036 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE; 3037 gatt_client_run(); 3038 return ERROR_CODE_SUCCESS; 3039 } 3040 3041 /** 3042 * @brief -> gatt complete event 3043 */ 3044 uint8_t gatt_client_cancel_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3045 gatt_client_t * gatt_client; 3046 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 3047 if (status != ERROR_CODE_SUCCESS){ 3048 return status; 3049 } 3050 3051 gatt_client->callback = callback; 3052 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE; 3053 gatt_client_run(); 3054 return ERROR_CODE_SUCCESS; 3055 } 3056 3057 void gatt_client_deserialize_service(const uint8_t *packet, int offset, gatt_client_service_t * service){ 3058 service->start_group_handle = little_endian_read_16(packet, offset); 3059 service->end_group_handle = little_endian_read_16(packet, offset + 2); 3060 reverse_128(&packet[offset + 4], service->uuid128); 3061 if (uuid_has_bluetooth_prefix(service->uuid128)){ 3062 service->uuid16 = big_endian_read_32(service->uuid128, 0); 3063 } else { 3064 service->uuid16 = 0; 3065 } 3066 } 3067 3068 void gatt_client_deserialize_characteristic(const uint8_t * packet, int offset, gatt_client_characteristic_t * characteristic){ 3069 characteristic->start_handle = little_endian_read_16(packet, offset); 3070 characteristic->value_handle = little_endian_read_16(packet, offset + 2); 3071 characteristic->end_handle = little_endian_read_16(packet, offset + 4); 3072 characteristic->properties = little_endian_read_16(packet, offset + 6); 3073 reverse_128(&packet[offset+8], characteristic->uuid128); 3074 if (uuid_has_bluetooth_prefix(characteristic->uuid128)){ 3075 characteristic->uuid16 = big_endian_read_32(characteristic->uuid128, 0); 3076 } else { 3077 characteristic->uuid16 = 0; 3078 } 3079 } 3080 3081 void gatt_client_deserialize_characteristic_descriptor(const uint8_t * packet, int offset, gatt_client_characteristic_descriptor_t * descriptor){ 3082 descriptor->handle = little_endian_read_16(packet, offset); 3083 reverse_128(&packet[offset+2], descriptor->uuid128); 3084 if (uuid_has_bluetooth_prefix(descriptor->uuid128)){ 3085 descriptor->uuid16 = big_endian_read_32(descriptor->uuid128, 0); 3086 } else { 3087 descriptor->uuid16 = 0; 3088 } 3089 } 3090 3091 void gatt_client_send_mtu_negotiation(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3092 gatt_client_t * gatt_client; 3093 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3094 if (status != ERROR_CODE_SUCCESS){ 3095 return; 3096 } 3097 if (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED){ 3098 gatt_client->callback = callback; 3099 gatt_client->mtu_state = SEND_MTU_EXCHANGE; 3100 gatt_client_run(); 3101 } 3102 } 3103 3104 uint8_t gatt_client_request_to_write_without_response(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 3105 gatt_client_t * gatt_client; 3106 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3107 if (status != ERROR_CODE_SUCCESS){ 3108 return status; 3109 } 3110 bool added = btstack_linked_list_add_tail(&gatt_client->write_without_response_requests, (btstack_linked_item_t*) callback_registration); 3111 if (added == false){ 3112 return ERROR_CODE_COMMAND_DISALLOWED; 3113 } else { 3114 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 3115 return ERROR_CODE_SUCCESS; 3116 } 3117 } 3118 3119 uint8_t gatt_client_request_to_send_gatt_query(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 3120 gatt_client_t * gatt_client; 3121 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3122 if (status != ERROR_CODE_SUCCESS){ 3123 return status; 3124 } 3125 bool added = btstack_linked_list_add_tail(&gatt_client->query_requests, (btstack_linked_item_t*) callback_registration); 3126 if (added == false){ 3127 return ERROR_CODE_COMMAND_DISALLOWED; 3128 } else { 3129 gatt_client_notify_can_send_query(gatt_client); 3130 return ERROR_CODE_SUCCESS; 3131 } 3132 } 3133 3134 uint8_t gatt_client_remove_gatt_query(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 3135 gatt_client_t * gatt_client; 3136 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3137 if (status != ERROR_CODE_SUCCESS){ 3138 return status; 3139 } 3140 (void)btstack_linked_list_remove(&gatt_client->query_requests, (btstack_linked_item_t*) callback_registration); 3141 return ERROR_CODE_SUCCESS; 3142 } 3143 3144 uint8_t gatt_client_request_can_write_without_response_event(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3145 gatt_client_t * gatt_client; 3146 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3147 if (status != ERROR_CODE_SUCCESS){ 3148 return status; 3149 } 3150 if (gatt_client->write_without_response_callback != NULL){ 3151 return GATT_CLIENT_IN_WRONG_STATE; 3152 } 3153 gatt_client->write_without_response_callback = callback; 3154 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 3155 return ERROR_CODE_SUCCESS; 3156 } 3157 3158 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 3159 void gatt_client_add_service_changed_handler(btstack_packet_callback_registration_t * callback) { 3160 btstack_linked_list_add_tail(&gatt_client_service_changed_handler, (btstack_linked_item_t*) callback); 3161 } 3162 3163 void gatt_client_remove_service_changed_handler(btstack_packet_callback_registration_t * callback){ 3164 btstack_linked_list_remove(&gatt_client_service_changed_handler, (btstack_linked_item_t*) callback); 3165 } 3166 #endif 3167 3168 #if defined(ENABLE_GATT_OVER_CLASSIC) || defined(ENABLE_GATT_OVER_EATT) 3169 3170 #include "hci_event.h" 3171 3172 static const hci_event_t gatt_client_connected = { 3173 GATT_EVENT_CONNECTED, 0, "11BH" 3174 }; 3175 3176 static const hci_event_t gatt_client_disconnected = { 3177 GATT_EVENT_DISCONNECTED, 0, "H" 3178 }; 3179 3180 static void 3181 gatt_client_emit_connected(btstack_packet_handler_t callback, uint8_t status, bd_addr_type_t addr_type, bd_addr_t addr, 3182 hci_con_handle_t con_handle) { 3183 uint8_t buffer[20]; 3184 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_connected, status, addr, con_handle); 3185 (*callback)(HCI_EVENT_PACKET, 0, buffer, len); 3186 } 3187 3188 #endif 3189 3190 #ifdef ENABLE_GATT_OVER_CLASSIC 3191 3192 #include "bluetooth_psm.h" 3193 3194 // single active SDP query 3195 static gatt_client_t * gatt_client_classic_active_sdp_query; 3196 3197 // macos protocol descriptor list requires 16 bytes 3198 static uint8_t gatt_client_classic_sdp_buffer[32]; 3199 3200 3201 static gatt_client_t * gatt_client_get_context_for_classic_addr(bd_addr_t addr){ 3202 btstack_linked_item_t *it; 3203 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 3204 gatt_client_t * gatt_client = (gatt_client_t *) it; 3205 if (memcmp(gatt_client->addr, addr, 6) == 0){ 3206 return gatt_client; 3207 } 3208 } 3209 return NULL; 3210 } 3211 3212 static gatt_client_t * gatt_client_get_context_for_l2cap_cid(uint16_t l2cap_cid){ 3213 btstack_linked_item_t *it; 3214 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 3215 gatt_client_t * gatt_client = (gatt_client_t *) it; 3216 if (gatt_client->l2cap_cid == l2cap_cid){ 3217 return gatt_client; 3218 } 3219 } 3220 return NULL; 3221 } 3222 3223 static void gatt_client_classic_handle_connected(gatt_client_t * gatt_client, uint8_t status){ 3224 // cache peer information 3225 bd_addr_t addr; 3226 // cppcheck-suppress uninitvar ; addr is reported as uninitialized although it's the destination of the memcpy 3227 memcpy(addr, gatt_client->addr, 6); 3228 bd_addr_type_t addr_type = gatt_client->addr_type; 3229 gatt_client->addr_type = BD_ADDR_TYPE_ACL; 3230 hci_con_handle_t con_handle = gatt_client->con_handle; 3231 btstack_packet_handler_t callback = gatt_client->callback; 3232 3233 if (status != ERROR_CODE_SUCCESS){ 3234 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 3235 btstack_memory_gatt_client_free(gatt_client); 3236 } 3237 3238 gatt_client_emit_connected(callback, status, addr_type, addr, con_handle); 3239 } 3240 3241 static void gatt_client_classic_retry(btstack_timer_source_t * ts){ 3242 gatt_client_t * gatt_client = gatt_client_for_timer(ts); 3243 if (gatt_client != NULL){ 3244 gatt_client->state = P_W4_L2CAP_CONNECTION; 3245 att_dispatch_classic_connect(gatt_client->addr, gatt_client->l2cap_psm, &gatt_client->l2cap_cid); 3246 } 3247 } 3248 3249 static void gatt_client_classic_handle_disconnected(gatt_client_t * gatt_client){ 3250 3251 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 3252 gatt_client_timeout_stop(gatt_client); 3253 3254 hci_con_handle_t con_handle = gatt_client->con_handle; 3255 btstack_packet_handler_t callback = gatt_client->callback; 3256 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 3257 btstack_memory_gatt_client_free(gatt_client); 3258 3259 uint8_t buffer[20]; 3260 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_disconnected, con_handle); 3261 (*callback)(HCI_EVENT_PACKET, 0, buffer, len); 3262 } 3263 3264 static void gatt_client_handle_sdp_client_query_attribute_value(gatt_client_t * connection, uint8_t *packet){ 3265 des_iterator_t des_list_it; 3266 des_iterator_t prot_it; 3267 3268 if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= sizeof(gatt_client_classic_sdp_buffer)) { 3269 gatt_client_classic_sdp_buffer[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); 3270 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)) { 3271 switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) { 3272 case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST: 3273 for (des_iterator_init(&des_list_it, gatt_client_classic_sdp_buffer); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) { 3274 uint8_t *des_element; 3275 uint8_t *element; 3276 uint32_t uuid; 3277 3278 if (des_iterator_get_type(&des_list_it) != DE_DES) continue; 3279 3280 des_element = des_iterator_get_element(&des_list_it); 3281 des_iterator_init(&prot_it, des_element); 3282 element = des_iterator_get_element(&prot_it); 3283 3284 if (de_get_element_type(element) != DE_UUID) continue; 3285 3286 uuid = de_get_uuid32(element); 3287 des_iterator_next(&prot_it); 3288 // we assume that the even if there are both roles supported, remote device uses the same psm and avdtp version for both 3289 switch (uuid){ 3290 case BLUETOOTH_PROTOCOL_L2CAP: 3291 if (!des_iterator_has_more(&prot_it)) continue; 3292 de_element_get_uint16(des_iterator_get_element(&prot_it), &connection->l2cap_psm); 3293 break; 3294 default: 3295 break; 3296 } 3297 } 3298 break; 3299 3300 default: 3301 break; 3302 } 3303 } 3304 } 3305 } 3306 3307 static void gatt_client_classic_sdp_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 3308 gatt_client_t * gatt_client = gatt_client_classic_active_sdp_query; 3309 btstack_assert(gatt_client != NULL); 3310 uint8_t status; 3311 3312 // TODO: handle sdp events, get l2cap psm 3313 switch (hci_event_packet_get_type(packet)){ 3314 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: 3315 gatt_client_handle_sdp_client_query_attribute_value(gatt_client, packet); 3316 // TODO: 3317 return; 3318 case SDP_EVENT_QUERY_COMPLETE: 3319 status = sdp_event_query_complete_get_status(packet); 3320 gatt_client_classic_active_sdp_query = NULL; 3321 log_info("l2cap psm: %0x, status %02x", gatt_client->l2cap_psm, status); 3322 if (status != ERROR_CODE_SUCCESS) break; 3323 if (gatt_client->l2cap_psm == 0) { 3324 status = SDP_SERVICE_NOT_FOUND; 3325 break; 3326 } 3327 break; 3328 default: 3329 btstack_assert(false); 3330 return; 3331 } 3332 3333 // done 3334 if (status == ERROR_CODE_SUCCESS){ 3335 gatt_client->state = P_W4_L2CAP_CONNECTION; 3336 status = att_dispatch_classic_connect(gatt_client->addr, gatt_client->l2cap_psm, &gatt_client->l2cap_cid); 3337 } 3338 if (status != ERROR_CODE_SUCCESS) { 3339 gatt_client_classic_handle_connected(gatt_client, status); 3340 } 3341 } 3342 3343 static void gatt_client_classic_sdp_start(void * context){ 3344 gatt_client_classic_active_sdp_query = (gatt_client_t *) context; 3345 gatt_client_classic_active_sdp_query->state = P_W4_SDP_QUERY; 3346 sdp_client_query_uuid16(gatt_client_classic_sdp_handler, gatt_client_classic_active_sdp_query->addr, ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 3347 } 3348 3349 static void gatt_client_classic_emit_connected(void * context){ 3350 gatt_client_t * gatt_client = (gatt_client_t *) context; 3351 gatt_client->state = P_READY; 3352 gatt_client_emit_connected(gatt_client->callback, ERROR_CODE_SUCCESS, gatt_client->addr_type, gatt_client->addr, gatt_client->con_handle); 3353 } 3354 3355 uint8_t gatt_client_classic_connect(btstack_packet_handler_t callback, bd_addr_t addr){ 3356 gatt_client_t * gatt_client = gatt_client_get_context_for_classic_addr(addr); 3357 if (gatt_client != NULL){ 3358 return ERROR_CODE_ACL_CONNECTION_ALREADY_EXISTS; 3359 } 3360 gatt_client = btstack_memory_gatt_client_get(); 3361 if (gatt_client == NULL){ 3362 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 3363 } 3364 // init state 3365 gatt_client->bearer_type = ATT_BEARER_UNENHANCED_CLASSIC; 3366 gatt_client->con_handle = HCI_CON_HANDLE_INVALID; 3367 memcpy(gatt_client->addr, addr, 6); 3368 gatt_client->addr_type = BD_ADDR_TYPE_ACL; 3369 gatt_client->mtu = ATT_DEFAULT_MTU; 3370 gatt_client->security_level = LEVEL_0; 3371 gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 3372 gatt_client->callback = callback; 3373 #ifdef ENABLE_GATT_OVER_EATT 3374 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3375 #endif 3376 btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); 3377 3378 // schedule emitted event if already connected, otherwise 3379 bool already_connected = false; 3380 hci_connection_t * hci_connection = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL); 3381 if (hci_connection != NULL){ 3382 if (hci_connection->att_server.l2cap_cid != 0){ 3383 already_connected = true; 3384 } 3385 } 3386 gatt_client->callback_request.context = gatt_client; 3387 if (already_connected){ 3388 gatt_client->con_handle = hci_connection->con_handle; 3389 gatt_client->callback_request.callback = &gatt_client_classic_emit_connected; 3390 gatt_client->state = P_W2_EMIT_CONNECTED; 3391 btstack_run_loop_execute_on_main_thread(&gatt_client->callback_request); 3392 } else { 3393 gatt_client->callback_request.callback = &gatt_client_classic_sdp_start; 3394 gatt_client->state = P_W2_SDP_QUERY; 3395 sdp_client_register_query_callback(&gatt_client->callback_request); 3396 } 3397 return ERROR_CODE_SUCCESS; 3398 } 3399 3400 uint8_t gatt_client_classic_disconnect(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3401 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 3402 if (gatt_client == NULL){ 3403 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 3404 } 3405 gatt_client->callback = callback; 3406 return l2cap_disconnect(gatt_client->l2cap_cid); 3407 } 3408 #endif 3409 3410 #ifdef ENABLE_GATT_OVER_EATT 3411 3412 #define MAX_NR_EATT_CHANNELS 5 3413 3414 static void gatt_client_le_enhanced_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 3415 3416 static uint8_t gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client_t * gatt_client, gatt_client_state_t state){ 3417 uint8_t num_clients = 0; 3418 btstack_linked_list_iterator_t it; 3419 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 3420 while (btstack_linked_list_iterator_has_next(&it)){ 3421 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3422 if (eatt_client->state == state){ 3423 num_clients++; 3424 } 3425 } 3426 return num_clients; 3427 } 3428 3429 static void gatt_client_eatt_finalize(gatt_client_t * gatt_client) { 3430 // free eatt clients 3431 btstack_linked_list_iterator_t it; 3432 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3433 while (btstack_linked_list_iterator_has_next(&it)) { 3434 gatt_client_t *eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3435 btstack_linked_list_iterator_remove(&it); 3436 btstack_memory_gatt_client_free(eatt_client); 3437 } 3438 } 3439 3440 // all channels connected 3441 static void gatt_client_le_enhanced_handle_connected(gatt_client_t * gatt_client, uint8_t status) { 3442 if (status == ERROR_CODE_SUCCESS){ 3443 uint8_t num_ready = gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client, P_READY); 3444 if (num_ready > 0){ 3445 gatt_client->eatt_state = GATT_CLIENT_EATT_READY; 3446 // free unused channels 3447 btstack_linked_list_iterator_t it; 3448 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3449 while (btstack_linked_list_iterator_has_next(&it)) { 3450 gatt_client_t *eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3451 if (eatt_client->state == P_L2CAP_CLOSED){ 3452 btstack_linked_list_iterator_remove(&it); 3453 btstack_memory_gatt_client_free(eatt_client); 3454 } 3455 } 3456 } else { 3457 hci_connection_t * hci_connection = hci_connection_for_handle(gatt_client->con_handle); 3458 btstack_assert(hci_connection != NULL); 3459 if (hci_connection->att_server.incoming_connection_request){ 3460 hci_connection->att_server.incoming_connection_request = false; 3461 log_info("Collision, retry in 100ms"); 3462 gatt_client->state = P_W2_L2CAP_CONNECT; 3463 // set timer for retry 3464 btstack_run_loop_set_timer(&gatt_client->gc_timeout, GATT_CLIENT_COLLISION_BACKOFF_MS); 3465 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_le_enhanced_retry); 3466 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 3467 return; 3468 } else { 3469 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3470 status = ERROR_CODE_CONNECTION_REJECTED_DUE_TO_LIMITED_RESOURCES; 3471 } 3472 } 3473 } else { 3474 gatt_client_eatt_finalize(gatt_client); 3475 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3476 } 3477 3478 gatt_client_emit_connected(gatt_client->callback, status, gatt_client->addr_type, gatt_client->addr, gatt_client->con_handle); 3479 } 3480 3481 // single channel disconnected 3482 static void gatt_client_le_enhanced_handle_ecbm_disconnected(gatt_client_t * gatt_client, gatt_client_t * eatt_client) { 3483 3484 // report error 3485 gatt_client_report_error_if_pending(eatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 3486 3487 // free memory 3488 btstack_linked_list_remove(&gatt_client->eatt_clients, (btstack_linked_item_t *) eatt_client); 3489 btstack_memory_gatt_client_free(eatt_client); 3490 3491 // last channel 3492 if (btstack_linked_list_empty(&gatt_client->eatt_clients)){ 3493 hci_connection_t * hci_connection = hci_connection_for_handle(gatt_client->con_handle); 3494 hci_connection->att_server.eatt_outgoing_active = false; 3495 3496 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY) { 3497 // report disconnected if last channel closed 3498 uint8_t buffer[20]; 3499 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_disconnected, gatt_client->con_handle); 3500 (*gatt_client->callback)(HCI_EVENT_PACKET, 0, buffer, len); 3501 } 3502 } 3503 } 3504 3505 static gatt_client_t * gatt_client_le_enhanced_get_context_for_l2cap_cid(uint16_t l2cap_cid, gatt_client_t ** out_eatt_client){ 3506 btstack_linked_list_iterator_t it; 3507 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3508 while (btstack_linked_list_iterator_has_next(&it)) { 3509 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3510 btstack_linked_list_iterator_t it2; 3511 btstack_linked_list_iterator_init(&it2, &gatt_client->eatt_clients); 3512 while (btstack_linked_list_iterator_has_next(&it2)) { 3513 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it2); 3514 if (eatt_client->l2cap_cid == l2cap_cid){ 3515 *out_eatt_client = eatt_client; 3516 return gatt_client; 3517 } 3518 } 3519 } 3520 return NULL; 3521 } 3522 3523 static void gatt_client_le_enhanced_setup_l2cap_channel(gatt_client_t * gatt_client){ 3524 uint8_t num_channels = gatt_client->eatt_num_clients; 3525 3526 // setup channels 3527 uint16_t buffer_size_per_client = gatt_client->eatt_storage_size / num_channels; 3528 uint16_t max_mtu = (buffer_size_per_client - REPORT_PREBUFFER_HEADER) / 2; 3529 uint8_t * receive_buffers[MAX_NR_EATT_CHANNELS]; 3530 uint16_t new_cids[MAX_NR_EATT_CHANNELS]; 3531 memset(gatt_client->eatt_storage_buffer, 0, gatt_client->eatt_storage_size); 3532 uint8_t i; 3533 for (i=0;i<gatt_client->eatt_num_clients; i++){ 3534 receive_buffers[i] = &gatt_client->eatt_storage_buffer[REPORT_PREBUFFER_HEADER]; 3535 gatt_client->eatt_storage_buffer += REPORT_PREBUFFER_HEADER + max_mtu; 3536 } 3537 3538 log_info("%u EATT clients with receive buffer size %u", gatt_client->eatt_num_clients, buffer_size_per_client); 3539 3540 uint8_t status = l2cap_ecbm_create_channels(&gatt_client_le_enhanced_packet_handler, 3541 gatt_client->con_handle, 3542 gatt_client->security_level, 3543 BLUETOOTH_PSM_EATT, num_channels, 3544 L2CAP_LE_AUTOMATIC_CREDITS, 3545 buffer_size_per_client, 3546 receive_buffers, 3547 new_cids); 3548 3549 if (status == ERROR_CODE_SUCCESS){ 3550 i = 0; 3551 btstack_linked_list_iterator_t it; 3552 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 3553 while (btstack_linked_list_iterator_has_next(&it)) { 3554 gatt_client_t *new_eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3555 3556 // init state with new cid and transmit buffer 3557 new_eatt_client->bearer_type = ATT_BEARER_ENHANCED_LE; 3558 new_eatt_client->con_handle = gatt_client->con_handle; 3559 new_eatt_client->mtu = 64; 3560 new_eatt_client->security_level = LEVEL_0; 3561 new_eatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 3562 new_eatt_client->state = P_W4_L2CAP_CONNECTION; 3563 new_eatt_client->l2cap_cid = new_cids[i]; 3564 new_eatt_client->eatt_storage_buffer = gatt_client->eatt_storage_buffer; 3565 gatt_client->eatt_storage_buffer += max_mtu; 3566 i++; 3567 } 3568 gatt_client->eatt_state = GATT_CLIENT_EATT_L2CAP_SETUP; 3569 } else { 3570 gatt_client_le_enhanced_handle_connected(gatt_client, status); 3571 } 3572 } 3573 3574 static void gatt_client_le_enhanced_retry(btstack_timer_source_t * ts){ 3575 gatt_client_t * gatt_client = gatt_client_for_timer(ts); 3576 if (gatt_client != NULL){ 3577 gatt_client->state = P_W4_L2CAP_CONNECTION; 3578 gatt_client_le_enhanced_setup_l2cap_channel(gatt_client); 3579 } 3580 } 3581 3582 static void gatt_client_le_enhanced_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) { 3583 gatt_client_t *gatt_client; 3584 gatt_client_t *eatt_client; 3585 hci_con_handle_t con_handle; 3586 uint16_t l2cap_cid; 3587 uint8_t status; 3588 gatt_client_characteristic_t characteristic; 3589 gatt_client_service_t service; 3590 switch (packet_type) { 3591 case HCI_EVENT_PACKET: 3592 switch (hci_event_packet_get_type(packet)) { 3593 case GATT_EVENT_SERVICE_QUERY_RESULT: 3594 con_handle = gatt_event_service_query_result_get_handle(packet); 3595 gatt_client = gatt_client_get_context_for_handle(con_handle); 3596 btstack_assert(gatt_client != NULL); 3597 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE); 3598 gatt_event_service_query_result_get_service(packet, &service); 3599 gatt_client->gatt_service_start_group_handle = service.start_group_handle; 3600 gatt_client->gatt_service_end_group_handle = service.end_group_handle; 3601 break; 3602 case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: 3603 con_handle = gatt_event_characteristic_value_query_result_get_handle(packet); 3604 gatt_client = gatt_client_get_context_for_handle(con_handle); 3605 btstack_assert(gatt_client != NULL); 3606 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE); 3607 if (gatt_event_characteristic_value_query_result_get_value_length(packet) >= 1) { 3608 gatt_client->gatt_server_supported_features = gatt_event_characteristic_value_query_result_get_value(packet)[0]; 3609 } 3610 break; 3611 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 3612 con_handle = gatt_event_characteristic_query_result_get_handle(packet); 3613 gatt_client = gatt_client_get_context_for_handle(con_handle); 3614 btstack_assert(gatt_client != NULL); 3615 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE); 3616 gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic); 3617 gatt_client->gatt_client_supported_features_handle = characteristic.value_handle; 3618 break; 3619 case GATT_EVENT_QUERY_COMPLETE: 3620 con_handle = gatt_event_query_complete_get_handle(packet); 3621 gatt_client = gatt_client_get_context_for_handle(con_handle); 3622 btstack_assert(gatt_client != NULL); 3623 switch (gatt_client->eatt_state){ 3624 case GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE: 3625 if (gatt_client->gatt_service_start_group_handle == 0){ 3626 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3627 } else { 3628 gatt_client->eatt_state = GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W2_SEND; 3629 } 3630 break; 3631 case GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE: 3632 if ((gatt_client->gatt_server_supported_features & 1) == 0) { 3633 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3634 } else { 3635 gatt_client->eatt_state = GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W2_SEND; 3636 } 3637 break; 3638 case GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE: 3639 if (gatt_client->gatt_client_supported_features_handle == 0){ 3640 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3641 } else { 3642 gatt_client->eatt_state = GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W2_SEND; 3643 } 3644 break; 3645 case GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W4_DONE: 3646 gatt_client_le_enhanced_setup_l2cap_channel(gatt_client); 3647 break; 3648 default: 3649 break; 3650 } 3651 break; 3652 case L2CAP_EVENT_ECBM_CHANNEL_OPENED: 3653 l2cap_cid = l2cap_event_ecbm_channel_opened_get_local_cid(packet); 3654 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(l2cap_cid, &eatt_client); 3655 3656 btstack_assert(gatt_client != NULL); 3657 btstack_assert(eatt_client != NULL); 3658 btstack_assert(eatt_client->state == P_W4_L2CAP_CONNECTION); 3659 3660 status = l2cap_event_channel_opened_get_status(packet); 3661 if (status == ERROR_CODE_SUCCESS){ 3662 eatt_client->state = P_READY; 3663 eatt_client->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); 3664 } else { 3665 eatt_client->state = P_L2CAP_CLOSED; 3666 } 3667 // connected if opened event for all channels received 3668 if (gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client, P_W4_L2CAP_CONNECTION) == 0){ 3669 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_SUCCESS); 3670 } 3671 break; 3672 case L2CAP_EVENT_CHANNEL_CLOSED: 3673 l2cap_cid = l2cap_event_channel_closed_get_local_cid(packet); 3674 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(l2cap_cid, &eatt_client); 3675 btstack_assert(gatt_client != NULL); 3676 btstack_assert(eatt_client != NULL); 3677 gatt_client_le_enhanced_handle_ecbm_disconnected(gatt_client, eatt_client); 3678 break; 3679 default: 3680 break; 3681 } 3682 break; 3683 case L2CAP_DATA_PACKET: 3684 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(channel, &eatt_client); 3685 btstack_assert(gatt_client != NULL); 3686 btstack_assert(eatt_client != NULL); 3687 gatt_client_handle_att_response(eatt_client, packet, size); 3688 gatt_client_run(); 3689 break; 3690 default: 3691 break; 3692 } 3693 } 3694 3695 static bool gatt_client_le_enhanced_handle_can_send_query(gatt_client_t * gatt_client){ 3696 uint8_t status = ERROR_CODE_SUCCESS; 3697 uint8_t gatt_client_supported_features = 0x06; // eatt + multiple value notifications 3698 switch (gatt_client->eatt_state){ 3699 case GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W2_SEND: 3700 gatt_client->gatt_service_start_group_handle = 0; 3701 gatt_client->eatt_state = GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE; 3702 status = gatt_client_discover_primary_services_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3703 gatt_client->con_handle, 3704 ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 3705 break; 3706 case GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W2_SEND: 3707 gatt_client->gatt_server_supported_features = 0; 3708 gatt_client->eatt_state = GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE; 3709 status = gatt_client_read_value_of_characteristics_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3710 gatt_client->con_handle, 3711 gatt_client->gatt_service_start_group_handle, 3712 gatt_client->gatt_service_end_group_handle, 3713 ORG_BLUETOOTH_CHARACTERISTIC_SERVER_SUPPORTED_FEATURES); 3714 return true; 3715 case GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W2_SEND: 3716 gatt_client->gatt_client_supported_features_handle = 0; 3717 gatt_client->eatt_state = GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE; 3718 status = gatt_client_discover_characteristics_for_handle_range_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3719 gatt_client->con_handle, 3720 gatt_client->gatt_service_start_group_handle, 3721 gatt_client->gatt_service_end_group_handle, 3722 ORG_BLUETOOTH_CHARACTERISTIC_CLIENT_SUPPORTED_FEATURES); 3723 return true; 3724 case GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W2_SEND: 3725 gatt_client->eatt_state = GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W4_DONE; 3726 status = gatt_client_write_value_of_characteristic(&gatt_client_le_enhanced_packet_handler, gatt_client->con_handle, 3727 gatt_client->gatt_client_supported_features_handle, 1, 3728 &gatt_client_supported_features); 3729 return true; 3730 default: 3731 break; 3732 } 3733 btstack_assert(status == ERROR_CODE_SUCCESS); 3734 UNUSED(status); 3735 return false; 3736 } 3737 3738 uint8_t gatt_client_le_enhanced_connect(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint8_t num_channels, uint8_t * storage_buffer, uint16_t storage_size) { 3739 gatt_client_t * gatt_client; 3740 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3741 if (status != ERROR_CODE_SUCCESS){ 3742 return status; 3743 } 3744 3745 if (gatt_client->eatt_state != GATT_CLIENT_EATT_IDLE){ 3746 return ERROR_CODE_COMMAND_DISALLOWED; 3747 } 3748 3749 // need one buffer for sending and one for receiving. Receiving includes pre-buffer for reports 3750 uint16_t buffer_size_per_client = storage_size / num_channels; 3751 uint16_t max_mtu = (buffer_size_per_client - REPORT_PREBUFFER_HEADER) / 2; 3752 if (max_mtu < 64) { 3753 return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS; 3754 } 3755 3756 if ((num_channels == 0) || (num_channels > MAX_NR_EATT_CHANNELS)){ 3757 return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS; 3758 } 3759 3760 // create max num_channel eatt clients 3761 uint8_t i; 3762 btstack_linked_list_t eatt_clients = NULL; 3763 for (i=0;i<num_channels;i++) { 3764 gatt_client_t * new_gatt_client = btstack_memory_gatt_client_get(); 3765 if (new_gatt_client == NULL) { 3766 break; 3767 } 3768 btstack_linked_list_add(&eatt_clients, (btstack_linked_item_t*)new_gatt_client); 3769 } 3770 3771 if (i != num_channels){ 3772 while (true){ 3773 gatt_client = (gatt_client_t *) btstack_linked_list_pop(&eatt_clients); 3774 if (gatt_client == NULL) { 3775 break; 3776 } 3777 btstack_memory_gatt_client_free(gatt_client); 3778 } 3779 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 3780 } 3781 3782 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 3783 hci_connection->att_server.eatt_outgoing_active = true; 3784 3785 gatt_client->callback = callback; 3786 gatt_client->eatt_num_clients = num_channels; 3787 gatt_client->eatt_storage_buffer = storage_buffer; 3788 gatt_client->eatt_storage_size = storage_size; 3789 gatt_client->eatt_clients = eatt_clients; 3790 gatt_client->eatt_state = GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W2_SEND; 3791 gatt_client_notify_can_send_query(gatt_client); 3792 3793 return ERROR_CODE_SUCCESS; 3794 } 3795 3796 #endif 3797 3798 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 3799 void gatt_client_att_packet_handler_fuzz(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 3800 gatt_client_att_packet_handler(packet_type, handle, packet, size); 3801 } 3802 3803 uint8_t gatt_client_get_client(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 3804 uint8_t status = gatt_client_provide_context_for_handle(con_handle, out_gatt_client); 3805 return status; 3806 } 3807 #endif 3808