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 "btstack_debug.h" 52 #include "btstack_event.h" 53 #include "btstack_memory.h" 54 #include "btstack_run_loop.h" 55 #include "btstack_util.h" 56 #include "hci.h" 57 #include "hci_dump.h" 58 #include "l2cap.h" 59 #include "classic/sdp_client.h" 60 #include "bluetooth_gatt.h" 61 #include "bluetooth_sdp.h" 62 #include "classic/sdp_util.h" 63 64 static btstack_linked_list_t gatt_client_connections; 65 static btstack_linked_list_t gatt_client_value_listeners; 66 static btstack_packet_callback_registration_t hci_event_callback_registration; 67 static btstack_packet_callback_registration_t sm_event_callback_registration; 68 69 // GATT Client Configuration 70 static bool gatt_client_mtu_exchange_enabled; 71 static gap_security_level_t gatt_client_required_security_level; 72 73 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size); 74 static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 75 static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code); 76 77 #ifdef ENABLE_LE_SIGNED_WRITE 78 static void att_signed_write_handle_cmac_result(uint8_t hash[8]); 79 #endif 80 81 void gatt_client_init(void){ 82 gatt_client_connections = NULL; 83 84 // default configuration 85 gatt_client_mtu_exchange_enabled = true; 86 gatt_client_required_security_level = LEVEL_0; 87 88 // register for HCI Events 89 hci_event_callback_registration.callback = &gatt_client_event_packet_handler; 90 hci_add_event_handler(&hci_event_callback_registration); 91 92 // register for SM Events 93 sm_event_callback_registration.callback = &gatt_client_event_packet_handler; 94 sm_add_event_handler(&sm_event_callback_registration); 95 96 // and ATT Client PDUs 97 att_dispatch_register_client(gatt_client_att_packet_handler); 98 } 99 100 void gatt_client_set_required_security_level(gap_security_level_t level){ 101 gatt_client_required_security_level = level; 102 } 103 104 static gatt_client_t * gatt_client_for_timer(btstack_timer_source_t * ts){ 105 btstack_linked_list_iterator_t it; 106 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 107 while (btstack_linked_list_iterator_has_next(&it)){ 108 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 109 if (&gatt_client->gc_timeout == ts) { 110 return gatt_client; 111 } 112 } 113 return NULL; 114 } 115 116 static void gatt_client_timeout_handler(btstack_timer_source_t * timer){ 117 gatt_client_t * gatt_client = gatt_client_for_timer(timer); 118 if (gatt_client == NULL) return; 119 log_info("GATT client timeout handle, handle 0x%02x", gatt_client->con_handle); 120 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_TIMEOUT); 121 } 122 123 static void gatt_client_timeout_start(gatt_client_t * gatt_client){ 124 log_info("GATT client timeout start, handle 0x%02x", gatt_client->con_handle); 125 btstack_run_loop_remove_timer(&gatt_client->gc_timeout); 126 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_timeout_handler); 127 btstack_run_loop_set_timer(&gatt_client->gc_timeout, 30000); // 30 seconds sm timeout 128 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 129 } 130 131 static void gatt_client_timeout_stop(gatt_client_t * gatt_client){ 132 log_info("GATT client timeout stop, handle 0x%02x", gatt_client->con_handle); 133 btstack_run_loop_remove_timer(&gatt_client->gc_timeout); 134 } 135 136 static gap_security_level_t gatt_client_le_security_level_for_connection(hci_con_handle_t con_handle){ 137 uint8_t encryption_key_size = gap_encryption_key_size(con_handle); 138 if (encryption_key_size == 0) return LEVEL_0; 139 140 bool authenticated = gap_authenticated(con_handle); 141 if (!authenticated) return LEVEL_2; 142 143 return encryption_key_size == 16 ? LEVEL_4 : LEVEL_3; 144 } 145 146 static gatt_client_t * gatt_client_get_context_for_handle(uint16_t handle){ 147 btstack_linked_item_t *it; 148 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 149 gatt_client_t * gatt_client = (gatt_client_t *) it; 150 if (gatt_client->con_handle == handle){ 151 return gatt_client; 152 } 153 } 154 return NULL; 155 } 156 157 158 // @return gatt_client context 159 // returns existing one, or tries to setup new one 160 static uint8_t gatt_client_provide_context_for_handle(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 161 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 162 163 if (gatt_client != NULL){ 164 *out_gatt_client = gatt_client; 165 return ERROR_CODE_SUCCESS; 166 } 167 168 // bail if no such hci connection 169 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 170 if (hci_connection == NULL){ 171 log_error("No connection for handle 0x%04x", con_handle); 172 *out_gatt_client = NULL; 173 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 174 } 175 176 gatt_client = btstack_memory_gatt_client_get(); 177 if (gatt_client == NULL){ 178 *out_gatt_client = NULL; 179 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 180 } 181 // init state 182 gatt_client->con_handle = con_handle; 183 gatt_client->mtu = ATT_DEFAULT_MTU; 184 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 185 if (gatt_client_mtu_exchange_enabled){ 186 gatt_client->mtu_state = SEND_MTU_EXCHANGE; 187 } else { 188 gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 189 } 190 gatt_client->gatt_client_state = P_READY; 191 btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); 192 193 // get unenhanced att bearer state 194 if (hci_connection->att_connection.mtu_exchanged){ 195 gatt_client->mtu = hci_connection->att_connection.mtu; 196 gatt_client->mtu_state = MTU_EXCHANGED; 197 } 198 *out_gatt_client = gatt_client; 199 return ERROR_CODE_SUCCESS; 200 } 201 202 static uint8_t gatt_client_provide_context_for_handle_and_start_timer(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 203 uint8_t status = gatt_client_provide_context_for_handle(con_handle, out_gatt_client); 204 if (status != ERROR_CODE_SUCCESS){ 205 return status; 206 } 207 gatt_client_timeout_start(*out_gatt_client); 208 return status; 209 } 210 211 static bool is_ready(gatt_client_t * gatt_client){ 212 return gatt_client->gatt_client_state == P_READY; 213 } 214 215 int gatt_client_is_ready(hci_con_handle_t con_handle){ 216 gatt_client_t * gatt_client; 217 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 218 if (status != ERROR_CODE_SUCCESS){ 219 return 0; 220 } 221 return is_ready(gatt_client) ? 1 : 0; 222 } 223 224 void gatt_client_mtu_enable_auto_negotiation(uint8_t enabled){ 225 gatt_client_mtu_exchange_enabled = enabled != 0; 226 } 227 228 uint8_t gatt_client_get_mtu(hci_con_handle_t con_handle, uint16_t * mtu){ 229 gatt_client_t * gatt_client; 230 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 231 if (status != ERROR_CODE_SUCCESS){ 232 return status; 233 } 234 235 if ((gatt_client->mtu_state == MTU_EXCHANGED) || (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED)){ 236 *mtu = gatt_client->mtu; 237 return ERROR_CODE_SUCCESS; 238 } 239 *mtu = ATT_DEFAULT_MTU; 240 return GATT_CLIENT_IN_WRONG_STATE; 241 } 242 243 // precondition: can_send_packet_now == TRUE 244 static uint8_t gatt_client_send(gatt_client_t * gatt_client, uint16_t len){ 245 #ifdef ENABLE_GATT_OVER_CLASSIC 246 if (gatt_client->l2cap_psm){ 247 return l2cap_send_prepared(gatt_client->l2cap_cid, len); 248 } 249 #endif 250 return l2cap_send_prepared_connectionless(gatt_client->con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, len); 251 } 252 253 // precondition: can_send_packet_now == TRUE 254 static uint8_t att_confirmation(gatt_client_t * gatt_client) { 255 l2cap_reserve_packet_buffer(); 256 257 uint8_t * request = l2cap_get_outgoing_buffer(); 258 request[0] = ATT_HANDLE_VALUE_CONFIRMATION; 259 260 return gatt_client_send(gatt_client, 1); 261 } 262 263 // precondition: can_send_packet_now == TRUE 264 static uint8_t att_find_information_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t start_handle, 265 uint16_t end_handle) { 266 l2cap_reserve_packet_buffer(); 267 uint8_t * request = l2cap_get_outgoing_buffer(); 268 269 request[0] = request_type; 270 little_endian_store_16(request, 1, start_handle); 271 little_endian_store_16(request, 3, end_handle); 272 273 return gatt_client_send(gatt_client, 5); 274 } 275 276 // precondition: can_send_packet_now == TRUE 277 static uint8_t 278 att_find_by_type_value_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_group_type, 279 uint16_t start_handle, uint16_t end_handle, uint8_t *value, uint16_t value_size) { 280 l2cap_reserve_packet_buffer(); 281 uint8_t * request = l2cap_get_outgoing_buffer(); 282 283 request[0] = request_type; 284 little_endian_store_16(request, 1, start_handle); 285 little_endian_store_16(request, 3, end_handle); 286 little_endian_store_16(request, 5, attribute_group_type); 287 (void)memcpy(&request[7], value, value_size); 288 289 return gatt_client_send(gatt_client, 7u + value_size); 290 } 291 292 // precondition: can_send_packet_now == TRUE 293 static uint8_t 294 att_read_by_type_or_group_request_for_uuid16(gatt_client_t *gatt_client, uint8_t request_type, uint16_t uuid16, 295 uint16_t start_handle, uint16_t end_handle) { 296 l2cap_reserve_packet_buffer(); 297 uint8_t * request = l2cap_get_outgoing_buffer(); 298 299 request[0] = request_type; 300 little_endian_store_16(request, 1, start_handle); 301 little_endian_store_16(request, 3, end_handle); 302 little_endian_store_16(request, 5, uuid16); 303 304 return gatt_client_send(gatt_client, 7); 305 } 306 307 // precondition: can_send_packet_now == TRUE 308 static uint8_t 309 att_read_by_type_or_group_request_for_uuid128(gatt_client_t *gatt_client, uint8_t request_type, const uint8_t *uuid128, 310 uint16_t start_handle, uint16_t end_handle) { 311 l2cap_reserve_packet_buffer(); 312 uint8_t * request = l2cap_get_outgoing_buffer(); 313 314 request[0] = request_type; 315 little_endian_store_16(request, 1, start_handle); 316 little_endian_store_16(request, 3, end_handle); 317 reverse_128(uuid128, &request[5]); 318 319 return gatt_client_send(gatt_client, 21); 320 } 321 322 // precondition: can_send_packet_now == TRUE 323 static uint8_t att_read_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle) { 324 l2cap_reserve_packet_buffer(); 325 uint8_t * request = l2cap_get_outgoing_buffer(); 326 327 request[0] = request_type; 328 little_endian_store_16(request, 1, attribute_handle); 329 330 return gatt_client_send(gatt_client, 3); 331 } 332 333 // precondition: can_send_packet_now == TRUE 334 static uint8_t att_read_blob_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, 335 uint16_t value_offset) { 336 l2cap_reserve_packet_buffer(); 337 uint8_t * request = l2cap_get_outgoing_buffer(); 338 request[0] = request_type; 339 little_endian_store_16(request, 1, attribute_handle); 340 little_endian_store_16(request, 3, value_offset); 341 342 return gatt_client_send(gatt_client, 5); 343 } 344 345 static uint8_t 346 att_read_multiple_request(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles) { 347 l2cap_reserve_packet_buffer(); 348 uint8_t * request = l2cap_get_outgoing_buffer(); 349 request[0] = ATT_READ_MULTIPLE_REQUEST; 350 int i; 351 int offset = 1; 352 for (i=0;i<num_value_handles;i++){ 353 little_endian_store_16(request, offset, value_handles[i]); 354 offset += 2; 355 } 356 357 return gatt_client_send(gatt_client, offset); 358 } 359 360 #ifdef ENABLE_LE_SIGNED_WRITE 361 // precondition: can_send_packet_now == TRUE 362 static uint8_t att_signed_write_request(gatt_client_t *gatt_client, uint16_t request_type, uint16_t attribute_handle, 363 uint16_t value_length, uint8_t *value, uint32_t sign_counter, uint8_t sgn[8]) { 364 l2cap_reserve_packet_buffer(); 365 uint8_t * request = l2cap_get_outgoing_buffer(); 366 request[0] = request_type; 367 little_endian_store_16(request, 1, attribute_handle); 368 (void)memcpy(&request[3], value, value_length); 369 little_endian_store_32(request, 3 + value_length, sign_counter); 370 reverse_64(sgn, &request[3 + value_length + 4]); 371 372 return gatt_client_send(gatt_client, 3 + value_length + 12); 373 } 374 #endif 375 376 // precondition: can_send_packet_now == TRUE 377 static uint8_t 378 att_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, uint16_t value_length, 379 uint8_t *value) { 380 l2cap_reserve_packet_buffer(); 381 uint8_t * request = l2cap_get_outgoing_buffer(); 382 request[0] = request_type; 383 little_endian_store_16(request, 1, attribute_handle); 384 (void)memcpy(&request[3], value, value_length); 385 386 return gatt_client_send(gatt_client, 3u + value_length); 387 } 388 389 // precondition: can_send_packet_now == TRUE 390 static uint8_t att_execute_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint8_t execute_write) { 391 l2cap_reserve_packet_buffer(); 392 uint8_t * request = l2cap_get_outgoing_buffer(); 393 request[0] = request_type; 394 request[1] = execute_write; 395 396 return gatt_client_send(gatt_client, 2); 397 } 398 399 // precondition: can_send_packet_now == TRUE 400 static uint8_t att_prepare_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, 401 uint16_t value_offset, uint16_t blob_length, uint8_t *value) { 402 l2cap_reserve_packet_buffer(); 403 uint8_t * request = l2cap_get_outgoing_buffer(); 404 request[0] = request_type; 405 little_endian_store_16(request, 1, attribute_handle); 406 little_endian_store_16(request, 3, value_offset); 407 (void)memcpy(&request[5], &value[value_offset], blob_length); 408 409 return gatt_client_send(gatt_client, 5u + blob_length); 410 } 411 412 static uint8_t att_exchange_mtu_request(gatt_client_t *gatt_client) { 413 uint16_t mtu = l2cap_max_le_mtu(); 414 l2cap_reserve_packet_buffer(); 415 uint8_t * request = l2cap_get_outgoing_buffer(); 416 request[0] = ATT_EXCHANGE_MTU_REQUEST; 417 little_endian_store_16(request, 1, mtu); 418 419 return gatt_client_send(gatt_client, 3); 420 } 421 422 static uint16_t write_blob_length(gatt_client_t * gatt_client){ 423 uint16_t max_blob_length = gatt_client->mtu - 5u; 424 if (gatt_client->attribute_offset >= gatt_client->attribute_length) { 425 return 0; 426 } 427 uint16_t rest_length = gatt_client->attribute_length - gatt_client->attribute_offset; 428 if (max_blob_length > rest_length){ 429 return rest_length; 430 } 431 return max_blob_length; 432 } 433 434 static void send_gatt_services_request(gatt_client_t *gatt_client){ 435 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_GROUP_TYPE_REQUEST, 436 gatt_client->uuid16, gatt_client->start_group_handle, 437 gatt_client->end_group_handle); 438 } 439 440 static void send_gatt_by_uuid_request(gatt_client_t *gatt_client, uint16_t attribute_group_type){ 441 if (gatt_client->uuid16){ 442 uint8_t uuid16[2]; 443 little_endian_store_16(uuid16, 0, gatt_client->uuid16); 444 att_find_by_type_value_request(gatt_client, ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, 445 gatt_client->start_group_handle, gatt_client->end_group_handle, uuid16, 2); 446 return; 447 } 448 uint8_t uuid128[16]; 449 reverse_128(gatt_client->uuid128, uuid128); 450 att_find_by_type_value_request(gatt_client, ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, 451 gatt_client->start_group_handle, gatt_client->end_group_handle, uuid128, 16); 452 } 453 454 static void send_gatt_services_by_uuid_request(gatt_client_t *gatt_client){ 455 send_gatt_by_uuid_request(gatt_client, GATT_PRIMARY_SERVICE_UUID); 456 } 457 458 static void send_gatt_included_service_uuid_request(gatt_client_t *gatt_client){ 459 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->query_start_handle); 460 } 461 462 static void send_gatt_included_service_request(gatt_client_t *gatt_client){ 463 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 464 GATT_INCLUDE_SERVICE_UUID, gatt_client->start_group_handle, 465 gatt_client->end_group_handle); 466 } 467 468 static void send_gatt_characteristic_request(gatt_client_t *gatt_client){ 469 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 470 GATT_CHARACTERISTICS_UUID, gatt_client->start_group_handle, 471 gatt_client->end_group_handle); 472 } 473 474 static void send_gatt_characteristic_descriptor_request(gatt_client_t *gatt_client){ 475 att_find_information_request(gatt_client, ATT_FIND_INFORMATION_REQUEST, gatt_client->start_group_handle, 476 gatt_client->end_group_handle); 477 } 478 479 static void send_gatt_read_characteristic_value_request(gatt_client_t *gatt_client){ 480 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 481 } 482 483 static void send_gatt_read_by_type_request(gatt_client_t * gatt_client){ 484 if (gatt_client->uuid16){ 485 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 486 gatt_client->uuid16, gatt_client->start_group_handle, 487 gatt_client->end_group_handle); 488 } else { 489 att_read_by_type_or_group_request_for_uuid128(gatt_client, ATT_READ_BY_TYPE_REQUEST, 490 gatt_client->uuid128, gatt_client->start_group_handle, 491 gatt_client->end_group_handle); 492 } 493 } 494 495 static void send_gatt_read_blob_request(gatt_client_t *gatt_client){ 496 if (gatt_client->attribute_offset == 0){ 497 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 498 } else { 499 att_read_blob_request(gatt_client, ATT_READ_BLOB_REQUEST, gatt_client->attribute_handle, 500 gatt_client->attribute_offset); 501 } 502 } 503 504 static void send_gatt_read_multiple_request(gatt_client_t * gatt_client){ 505 att_read_multiple_request(gatt_client, gatt_client->read_multiple_handle_count, gatt_client->read_multiple_handles); 506 } 507 508 static void send_gatt_write_attribute_value_request(gatt_client_t * gatt_client){ 509 att_write_request(gatt_client, ATT_WRITE_REQUEST, gatt_client->attribute_handle, gatt_client->attribute_length, 510 gatt_client->attribute_value); 511 } 512 513 static void send_gatt_write_client_characteristic_configuration_request(gatt_client_t * gatt_client){ 514 att_write_request(gatt_client, ATT_WRITE_REQUEST, gatt_client->client_characteristic_configuration_handle, 2, 515 gatt_client->client_characteristic_configuration_value); 516 } 517 518 static void send_gatt_prepare_write_request(gatt_client_t * gatt_client){ 519 att_prepare_write_request(gatt_client, ATT_PREPARE_WRITE_REQUEST, gatt_client->attribute_handle, 520 gatt_client->attribute_offset, write_blob_length(gatt_client), 521 gatt_client->attribute_value); 522 } 523 524 static void send_gatt_execute_write_request(gatt_client_t * gatt_client){ 525 att_execute_write_request(gatt_client, ATT_EXECUTE_WRITE_REQUEST, 1); 526 } 527 528 static void send_gatt_cancel_prepared_write_request(gatt_client_t * gatt_client){ 529 att_execute_write_request(gatt_client, ATT_EXECUTE_WRITE_REQUEST, 0); 530 } 531 532 #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 533 static void send_gatt_read_client_characteristic_configuration_request(gatt_client_t * gatt_client){ 534 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 535 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION, 536 gatt_client->start_group_handle, gatt_client->end_group_handle); 537 } 538 #endif 539 540 static void send_gatt_read_characteristic_descriptor_request(gatt_client_t * gatt_client){ 541 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 542 } 543 544 #ifdef ENABLE_LE_SIGNED_WRITE 545 static void send_gatt_signed_write_request(gatt_client_t * gatt_client, uint32_t sign_counter){ 546 att_signed_write_request(gatt_client, ATT_SIGNED_WRITE_COMMAND, gatt_client->attribute_handle, 547 gatt_client->attribute_length, gatt_client->attribute_value, sign_counter, 548 gatt_client->cmac); 549 } 550 #endif 551 552 static uint16_t get_last_result_handle_from_service_list(uint8_t * packet, uint16_t size){ 553 if (size < 2) return 0xffff; 554 uint8_t attr_length = packet[1]; 555 if ((2 + attr_length) > size) return 0xffff; 556 return little_endian_read_16(packet, size - attr_length + 2u); 557 } 558 559 static uint16_t get_last_result_handle_from_characteristics_list(uint8_t * packet, uint16_t size){ 560 if (size < 2) return 0xffff; 561 uint8_t attr_length = packet[1]; 562 if ((2 + attr_length) > size) return 0xffff; 563 return little_endian_read_16(packet, size - attr_length + 3u); 564 } 565 566 static uint16_t get_last_result_handle_from_included_services_list(uint8_t * packet, uint16_t size){ 567 if (size < 2) return 0xffff; 568 uint8_t attr_length = packet[1]; 569 if ((2 + attr_length) > size) return 0xffff; 570 return little_endian_read_16(packet, size - attr_length); 571 } 572 573 static void gatt_client_notify_can_send_query(gatt_client_t * gatt_client){ 574 while (gatt_client->gatt_client_state == P_READY){ 575 btstack_context_callback_registration_t * callback = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->query_requests); 576 if (callback == NULL) { 577 return; 578 } 579 (*callback->callback)(callback->context); 580 } 581 } 582 583 static void gatt_client_handle_transaction_complete(gatt_client_t * gatt_client){ 584 gatt_client->gatt_client_state = P_READY; 585 gatt_client_timeout_stop(gatt_client); 586 gatt_client_notify_can_send_query(gatt_client); 587 } 588 589 static void emit_event_new(btstack_packet_handler_t callback, uint8_t * packet, uint16_t size){ 590 if (!callback) return; 591 hci_dump_packet(HCI_EVENT_PACKET, 1, packet, size); 592 (*callback)(HCI_EVENT_PACKET, 0, packet, size); 593 } 594 595 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){ 596 notification->callback = callback; 597 notification->con_handle = con_handle; 598 if (characteristic == NULL){ 599 notification->attribute_handle = GATT_CLIENT_ANY_VALUE_HANDLE; 600 } else { 601 notification->attribute_handle = characteristic->value_handle; 602 } 603 btstack_linked_list_add(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 604 } 605 606 void gatt_client_stop_listening_for_characteristic_value_updates(gatt_client_notification_t * notification){ 607 btstack_linked_list_remove(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 608 } 609 610 static void emit_event_to_registered_listeners(hci_con_handle_t con_handle, uint16_t attribute_handle, uint8_t * packet, uint16_t size){ 611 btstack_linked_list_iterator_t it; 612 btstack_linked_list_iterator_init(&it, &gatt_client_value_listeners); 613 while (btstack_linked_list_iterator_has_next(&it)){ 614 gatt_client_notification_t * notification = (gatt_client_notification_t*) btstack_linked_list_iterator_next(&it); 615 if ((notification->con_handle != GATT_CLIENT_ANY_CONNECTION) && (notification->con_handle != con_handle)) continue; 616 if ((notification->attribute_handle != GATT_CLIENT_ANY_VALUE_HANDLE) && (notification->attribute_handle != attribute_handle)) continue; 617 (*notification->callback)(HCI_EVENT_PACKET, 0, packet, size); 618 } 619 } 620 621 static void emit_gatt_complete_event(gatt_client_t * gatt_client, uint8_t att_status){ 622 // @format H1 623 uint8_t packet[5]; 624 packet[0] = GATT_EVENT_QUERY_COMPLETE; 625 packet[1] = 3; 626 little_endian_store_16(packet, 2, gatt_client->con_handle); 627 packet[4] = att_status; 628 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 629 } 630 631 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){ 632 // @format HX 633 uint8_t packet[24]; 634 packet[0] = GATT_EVENT_SERVICE_QUERY_RESULT; 635 packet[1] = sizeof(packet) - 2u; 636 little_endian_store_16(packet, 2, gatt_client->con_handle); 637 /// 638 little_endian_store_16(packet, 4, start_group_handle); 639 little_endian_store_16(packet, 6, end_group_handle); 640 reverse_128(uuid128, &packet[8]); 641 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 642 } 643 644 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){ 645 // @format HX 646 uint8_t packet[26]; 647 packet[0] = GATT_EVENT_INCLUDED_SERVICE_QUERY_RESULT; 648 packet[1] = sizeof(packet) - 2u; 649 little_endian_store_16(packet, 2, gatt_client->con_handle); 650 /// 651 little_endian_store_16(packet, 4, include_handle); 652 // 653 little_endian_store_16(packet, 6, start_group_handle); 654 little_endian_store_16(packet, 8, end_group_handle); 655 reverse_128(uuid128, &packet[10]); 656 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 657 } 658 659 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, 660 uint16_t properties, const uint8_t * uuid128){ 661 // @format HY 662 uint8_t packet[28]; 663 packet[0] = GATT_EVENT_CHARACTERISTIC_QUERY_RESULT; 664 packet[1] = sizeof(packet) - 2u; 665 little_endian_store_16(packet, 2, gatt_client->con_handle); 666 /// 667 little_endian_store_16(packet, 4, start_handle); 668 little_endian_store_16(packet, 6, value_handle); 669 little_endian_store_16(packet, 8, end_handle); 670 little_endian_store_16(packet, 10, properties); 671 reverse_128(uuid128, &packet[12]); 672 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 673 } 674 675 static void emit_gatt_all_characteristic_descriptors_result_event( 676 gatt_client_t * gatt_client, uint16_t descriptor_handle, const uint8_t * uuid128){ 677 // @format HZ 678 uint8_t packet[22]; 679 packet[0] = GATT_EVENT_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT; 680 packet[1] = sizeof(packet) - 2u; 681 little_endian_store_16(packet, 2, gatt_client->con_handle); 682 /// 683 little_endian_store_16(packet, 4, descriptor_handle); 684 reverse_128(uuid128, &packet[6]); 685 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 686 } 687 688 static void emit_gatt_mtu_exchanged_result_event(gatt_client_t * gatt_client, uint16_t new_mtu){ 689 // @format H2 690 uint8_t packet[6]; 691 packet[0] = GATT_EVENT_MTU; 692 packet[1] = sizeof(packet) - 2u; 693 little_endian_store_16(packet, 2, gatt_client->con_handle); 694 little_endian_store_16(packet, 4, new_mtu); 695 att_dispatch_client_mtu_exchanged(gatt_client->con_handle, new_mtu); 696 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 697 } 698 /// 699 static void report_gatt_services(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 700 if (size < 2) return; 701 uint8_t attr_length = packet[1]; 702 uint8_t uuid_length = attr_length - 4u; 703 704 int i; 705 for (i = 2; (i+attr_length) <= size; i += attr_length){ 706 uint16_t start_group_handle = little_endian_read_16(packet,i); 707 uint16_t end_group_handle = little_endian_read_16(packet,i+2); 708 uint8_t uuid128[16]; 709 uint16_t uuid16 = 0; 710 711 if (uuid_length == 2u){ 712 uuid16 = little_endian_read_16(packet, i+4); 713 uuid_add_bluetooth_prefix((uint8_t*) &uuid128, uuid16); 714 } else if (uuid_length == 16u) { 715 reverse_128(&packet[i+4], uuid128); 716 } else { 717 return; 718 } 719 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, uuid128); 720 } 721 } 722 723 // helper 724 static void characteristic_start_found(gatt_client_t * gatt_client, uint16_t start_handle, uint8_t properties, uint16_t value_handle, uint8_t * uuid, uint16_t uuid_length){ 725 uint8_t uuid128[16]; 726 uint16_t uuid16 = 0; 727 if (uuid_length == 2u){ 728 uuid16 = little_endian_read_16(uuid, 0); 729 uuid_add_bluetooth_prefix((uint8_t*) uuid128, uuid16); 730 } else if (uuid_length == 16u){ 731 reverse_128(uuid, uuid128); 732 } else { 733 return; 734 } 735 736 if (gatt_client->filter_with_uuid && (memcmp(gatt_client->uuid128, uuid128, 16) != 0)) return; 737 738 gatt_client->characteristic_properties = properties; 739 gatt_client->characteristic_start_handle = start_handle; 740 gatt_client->attribute_handle = value_handle; 741 742 if (gatt_client->filter_with_uuid) return; 743 744 gatt_client->uuid16 = uuid16; 745 (void)memcpy(gatt_client->uuid128, uuid128, 16); 746 } 747 748 static void characteristic_end_found(gatt_client_t * gatt_client, uint16_t end_handle){ 749 // TODO: stop searching if filter and uuid found 750 751 if (!gatt_client->characteristic_start_handle) return; 752 753 emit_gatt_characteristic_query_result_event(gatt_client, gatt_client->characteristic_start_handle, gatt_client->attribute_handle, 754 end_handle, gatt_client->characteristic_properties, gatt_client->uuid128); 755 756 gatt_client->characteristic_start_handle = 0; 757 } 758 759 static void report_gatt_characteristics(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 760 if (size < 2u) return; 761 uint8_t attr_length = packet[1]; 762 if ((attr_length != 7u) && (attr_length != 21u)) return; 763 uint8_t uuid_length = attr_length - 5u; 764 int i; 765 for (i = 2u; (i + attr_length) <= size; i += attr_length){ 766 uint16_t start_handle = little_endian_read_16(packet, i); 767 uint8_t properties = packet[i+2]; 768 uint16_t value_handle = little_endian_read_16(packet, i+3); 769 characteristic_end_found(gatt_client, start_handle - 1u); 770 characteristic_start_found(gatt_client, start_handle, properties, value_handle, &packet[i + 5], uuid_length); 771 } 772 } 773 774 static void report_gatt_included_service_uuid16(gatt_client_t * gatt_client, uint16_t include_handle, uint16_t uuid16){ 775 uint8_t normalized_uuid128[16]; 776 uuid_add_bluetooth_prefix(normalized_uuid128, uuid16); 777 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 778 gatt_client->query_end_handle, normalized_uuid128); 779 } 780 781 static void report_gatt_included_service_uuid128(gatt_client_t * gatt_client, uint16_t include_handle, const uint8_t * uuid128){ 782 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 783 gatt_client->query_end_handle, uuid128); 784 } 785 786 // @return packet pointer 787 // @note assume that value is part of an l2cap buffer - overwrite HCI + L2CAP packet headers 788 static const int characteristic_value_event_header_size = 8; 789 static uint8_t * setup_characteristic_value_packet(uint8_t type, hci_con_handle_t con_handle, uint16_t attribute_handle, uint8_t * value, uint16_t length){ 790 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 791 // copy value into test packet for testing 792 static uint8_t packet[1000]; 793 memcpy(&packet[8], value, length); 794 #else 795 // before the value inside the ATT PDU 796 uint8_t * packet = value - characteristic_value_event_header_size; 797 #endif 798 packet[0] = type; 799 packet[1] = characteristic_value_event_header_size - 2 + length; 800 little_endian_store_16(packet, 2, con_handle); 801 little_endian_store_16(packet, 4, attribute_handle); 802 little_endian_store_16(packet, 6, length); 803 return packet; 804 } 805 806 // @return packet pointer 807 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 808 static const int long_characteristic_value_event_header_size = 10; 809 static uint8_t * setup_long_characteristic_value_packet(uint8_t type, hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint8_t * value, uint16_t length){ 810 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 811 // avoid using pre ATT headers. 812 return NULL; 813 #endif 814 #if defined(HCI_INCOMING_PRE_BUFFER_SIZE) && (HCI_INCOMING_PRE_BUFFER_SIZE >= 10 - 8) // L2CAP Header (4) - ACL Header (4) 815 // before the value inside the ATT PDU 816 uint8_t * packet = value - long_characteristic_value_event_header_size; 817 packet[0] = type; 818 packet[1] = long_characteristic_value_event_header_size - 2 + length; 819 little_endian_store_16(packet, 2, con_handle); 820 little_endian_store_16(packet, 4, attribute_handle); 821 little_endian_store_16(packet, 6, offset); 822 little_endian_store_16(packet, 8, length); 823 return packet; 824 #else 825 log_error("HCI_INCOMING_PRE_BUFFER_SIZE >= 2 required for long characteristic reads"); 826 return NULL; 827 #endif 828 } 829 830 // test if notification/indication should be delivered to application (BLESA) 831 static bool gatt_client_accept_server_message(gatt_client_t *gatt_client) { 832 #ifdef ENABLE_LE_PROACTIVE_AUTHENTICATION 833 // ignore messages until re-encryption is complete 834 if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return false; 835 836 // after that ignore if bonded but not encrypted 837 return !gap_bonded(gatt_client->con_handle) || (gap_encryption_key_size(gatt_client->con_handle) > 0); 838 #else 839 UNUSED(gatt_client); 840 return true; 841 #endif 842 } 843 844 845 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 846 static void report_gatt_notification(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { 847 if (!gatt_client_accept_server_message(gatt_client)) return; 848 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_NOTIFICATION, gatt_client->con_handle, value_handle, value, length); 849 emit_event_to_registered_listeners(gatt_client->con_handle, value_handle, packet, characteristic_value_event_header_size + length); 850 } 851 852 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 853 static void report_gatt_indication(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { 854 if (!gatt_client_accept_server_message(gatt_client)) return; 855 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_INDICATION, gatt_client->con_handle, value_handle, value, length); 856 emit_event_to_registered_listeners(gatt_client->con_handle, value_handle, packet, characteristic_value_event_header_size + length); 857 } 858 859 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 860 static void report_gatt_characteristic_value(gatt_client_t * gatt_client, uint16_t attribute_handle, uint8_t * value, uint16_t length){ 861 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT, gatt_client->con_handle, attribute_handle, value, length); 862 emit_event_new(gatt_client->callback, packet, characteristic_value_event_header_size + length); 863 } 864 865 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 866 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){ 867 uint8_t * packet = setup_long_characteristic_value_packet(GATT_EVENT_LONG_CHARACTERISTIC_VALUE_QUERY_RESULT, gatt_client->con_handle, attribute_handle, value_offset, blob, blob_length); 868 if (!packet) return; 869 emit_event_new(gatt_client->callback, packet, blob_length + long_characteristic_value_event_header_size); 870 } 871 872 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){ 873 UNUSED(value_offset); 874 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, gatt_client->con_handle, descriptor_handle, value, value_length); 875 emit_event_new(gatt_client->callback, packet, value_length + 8u); 876 } 877 878 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){ 879 uint8_t * packet = setup_long_characteristic_value_packet(GATT_EVENT_LONG_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, gatt_client->con_handle, descriptor_handle, value_offset, blob, blob_length); 880 if (!packet) return; 881 emit_event_new(gatt_client->callback, packet, blob_length + long_characteristic_value_event_header_size); 882 } 883 884 static void report_gatt_all_characteristic_descriptors(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size, uint16_t pair_size){ 885 int i; 886 for (i = 0u; (i + pair_size) <= size; i += pair_size){ 887 uint16_t descriptor_handle = little_endian_read_16(packet,i); 888 uint8_t uuid128[16]; 889 uint16_t uuid16 = 0; 890 if (pair_size == 4u){ 891 uuid16 = little_endian_read_16(packet,i+2); 892 uuid_add_bluetooth_prefix(uuid128, uuid16); 893 } else { 894 reverse_128(&packet[i+2], uuid128); 895 } 896 emit_gatt_all_characteristic_descriptors_result_event(gatt_client, descriptor_handle, uuid128); 897 } 898 899 } 900 901 static int is_query_done(gatt_client_t * gatt_client, uint16_t last_result_handle){ 902 return last_result_handle >= gatt_client->end_group_handle; 903 } 904 905 static void trigger_next_query(gatt_client_t * gatt_client, uint16_t last_result_handle, gatt_client_state_t next_query_state){ 906 if (is_query_done(gatt_client, last_result_handle)){ 907 gatt_client_handle_transaction_complete(gatt_client); 908 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 909 return; 910 } 911 // next 912 gatt_client->start_group_handle = last_result_handle + 1u; 913 gatt_client->gatt_client_state = next_query_state; 914 } 915 916 static void trigger_next_included_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 917 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_INCLUDED_SERVICE_QUERY); 918 } 919 920 static void trigger_next_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 921 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_QUERY); 922 } 923 924 static void trigger_next_service_by_uuid_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 925 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_WITH_UUID_QUERY); 926 } 927 928 static void trigger_next_characteristic_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 929 if (is_query_done(gatt_client, last_result_handle)){ 930 // report last characteristic 931 characteristic_end_found(gatt_client, gatt_client->end_group_handle); 932 } 933 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY); 934 } 935 936 static void trigger_next_characteristic_descriptor_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 937 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY); 938 } 939 940 static void trigger_next_read_by_type_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 941 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_READ_BY_TYPE_REQUEST); 942 } 943 944 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){ 945 gatt_client->attribute_offset += write_blob_length(gatt_client); 946 uint16_t next_blob_length = write_blob_length(gatt_client); 947 948 if (next_blob_length == 0u){ 949 gatt_client->gatt_client_state = done_state; 950 return; 951 } 952 gatt_client->gatt_client_state = next_query_state; 953 } 954 955 static void trigger_next_blob_query(gatt_client_t * gatt_client, gatt_client_state_t next_query_state, uint16_t received_blob_length){ 956 957 uint16_t max_blob_length = gatt_client->mtu - 1u; 958 if (received_blob_length < max_blob_length){ 959 gatt_client_handle_transaction_complete(gatt_client); 960 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 961 return; 962 } 963 964 gatt_client->attribute_offset += received_blob_length; 965 gatt_client->gatt_client_state = next_query_state; 966 } 967 968 969 static int is_value_valid(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size){ 970 uint16_t attribute_handle = little_endian_read_16(packet, 1); 971 uint16_t value_offset = little_endian_read_16(packet, 3); 972 973 if (gatt_client->attribute_handle != attribute_handle) return 0; 974 if (gatt_client->attribute_offset != value_offset) return 0; 975 return memcmp(&gatt_client->attribute_value[gatt_client->attribute_offset], &packet[5], size - 5u) == 0u; 976 } 977 978 static void gatt_client_run_for_client_start_signed_write(gatt_client_t *gatt_client) { 979 sm_key_t csrk; 980 le_device_db_local_csrk_get(gatt_client->le_device_index, csrk); 981 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 982 gatt_client->gatt_client_state = P_W4_CMAC_RESULT; 983 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); 984 } 985 986 // returns true if packet was sent 987 static bool gatt_client_run_for_gatt_client(gatt_client_t * gatt_client){ 988 989 // wait until re-encryption is complete 990 if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return false; 991 992 // wait until re-encryption is complete 993 if (gatt_client->reencryption_active) return false; 994 995 // wait until pairing complete (either reactive authentication or due to required security level) 996 if (gatt_client->wait_for_authentication_complete) return false; 997 998 bool client_request_pending = gatt_client->gatt_client_state != P_READY; 999 1000 // verify security level for Mandatory Authentication over LE 1001 bool check_security = true; 1002 #ifdef ENABLE_GATT_OVER_CLASSIC 1003 if (gatt_client->l2cap_psm != 0){ 1004 check_security = false; 1005 } 1006 #endif 1007 if (client_request_pending && (gatt_client_required_security_level > gatt_client->security_level) && check_security){ 1008 log_info("Trigger pairing, current security level %u, required %u\n", gatt_client->security_level, gatt_client_required_security_level); 1009 gatt_client->wait_for_authentication_complete = 1; 1010 // set att error code for pairing failure based on required level 1011 switch (gatt_client_required_security_level){ 1012 case LEVEL_4: 1013 case LEVEL_3: 1014 gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_AUTHENTICATION; 1015 break; 1016 default: 1017 gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_ENCRYPTION; 1018 break; 1019 } 1020 sm_request_pairing(gatt_client->con_handle); 1021 // sm probably just sent a pdu 1022 return true; 1023 } 1024 1025 switch (gatt_client->mtu_state) { 1026 case SEND_MTU_EXCHANGE: 1027 gatt_client->mtu_state = SENT_MTU_EXCHANGE; 1028 att_exchange_mtu_request(gatt_client); 1029 return true; 1030 case SENT_MTU_EXCHANGE: 1031 return false; 1032 default: 1033 break; 1034 } 1035 1036 if (gatt_client->send_confirmation){ 1037 gatt_client->send_confirmation = 0; 1038 att_confirmation(gatt_client); 1039 return true; 1040 } 1041 1042 // check MTU for writes 1043 switch (gatt_client->gatt_client_state){ 1044 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 1045 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 1046 if (gatt_client->attribute_length <= (gatt_client->mtu - 3u)) break; 1047 log_error("gatt_client_run: value len %u > MTU %u - 3\n", gatt_client->attribute_length,gatt_client->mtu); 1048 gatt_client_handle_transaction_complete(gatt_client); 1049 emit_gatt_complete_event(gatt_client, ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH); 1050 return false; 1051 default: 1052 break; 1053 } 1054 1055 switch (gatt_client->gatt_client_state){ 1056 case P_W2_SEND_SERVICE_QUERY: 1057 gatt_client->gatt_client_state = P_W4_SERVICE_QUERY_RESULT; 1058 send_gatt_services_request(gatt_client); 1059 return true; 1060 1061 case P_W2_SEND_SERVICE_WITH_UUID_QUERY: 1062 gatt_client->gatt_client_state = P_W4_SERVICE_WITH_UUID_RESULT; 1063 send_gatt_services_by_uuid_request(gatt_client); 1064 return true; 1065 1066 case P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY: 1067 gatt_client->gatt_client_state = P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT; 1068 send_gatt_characteristic_request(gatt_client); 1069 return true; 1070 1071 case P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY: 1072 gatt_client->gatt_client_state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 1073 send_gatt_characteristic_request(gatt_client); 1074 return true; 1075 1076 case P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY: 1077 gatt_client->gatt_client_state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 1078 send_gatt_characteristic_descriptor_request(gatt_client); 1079 return true; 1080 1081 case P_W2_SEND_INCLUDED_SERVICE_QUERY: 1082 gatt_client->gatt_client_state = P_W4_INCLUDED_SERVICE_QUERY_RESULT; 1083 send_gatt_included_service_request(gatt_client); 1084 return true; 1085 1086 case P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY: 1087 gatt_client->gatt_client_state = P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT; 1088 send_gatt_included_service_uuid_request(gatt_client); 1089 return true; 1090 1091 case P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY: 1092 gatt_client->gatt_client_state = P_W4_READ_CHARACTERISTIC_VALUE_RESULT; 1093 send_gatt_read_characteristic_value_request(gatt_client); 1094 return true; 1095 1096 case P_W2_SEND_READ_BLOB_QUERY: 1097 gatt_client->gatt_client_state = P_W4_READ_BLOB_RESULT; 1098 send_gatt_read_blob_request(gatt_client); 1099 return true; 1100 1101 case P_W2_SEND_READ_BY_TYPE_REQUEST: 1102 gatt_client->gatt_client_state = P_W4_READ_BY_TYPE_RESPONSE; 1103 send_gatt_read_by_type_request(gatt_client); 1104 return true; 1105 1106 case P_W2_SEND_READ_MULTIPLE_REQUEST: 1107 gatt_client->gatt_client_state = P_W4_READ_MULTIPLE_RESPONSE; 1108 send_gatt_read_multiple_request(gatt_client); 1109 return true; 1110 1111 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 1112 gatt_client->gatt_client_state = P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT; 1113 send_gatt_write_attribute_value_request(gatt_client); 1114 return true; 1115 1116 case P_W2_PREPARE_WRITE: 1117 gatt_client->gatt_client_state = P_W4_PREPARE_WRITE_RESULT; 1118 send_gatt_prepare_write_request(gatt_client); 1119 return true; 1120 1121 case P_W2_PREPARE_WRITE_SINGLE: 1122 gatt_client->gatt_client_state = P_W4_PREPARE_WRITE_SINGLE_RESULT; 1123 send_gatt_prepare_write_request(gatt_client); 1124 return true; 1125 1126 case P_W2_PREPARE_RELIABLE_WRITE: 1127 gatt_client->gatt_client_state = P_W4_PREPARE_RELIABLE_WRITE_RESULT; 1128 send_gatt_prepare_write_request(gatt_client); 1129 return true; 1130 1131 case P_W2_EXECUTE_PREPARED_WRITE: 1132 gatt_client->gatt_client_state = P_W4_EXECUTE_PREPARED_WRITE_RESULT; 1133 send_gatt_execute_write_request(gatt_client); 1134 return true; 1135 1136 case P_W2_CANCEL_PREPARED_WRITE: 1137 gatt_client->gatt_client_state = P_W4_CANCEL_PREPARED_WRITE_RESULT; 1138 send_gatt_cancel_prepared_write_request(gatt_client); 1139 return true; 1140 1141 case P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH: 1142 gatt_client->gatt_client_state = P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT; 1143 send_gatt_cancel_prepared_write_request(gatt_client); 1144 return true; 1145 1146 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1147 case P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 1148 // use Find Information 1149 gatt_client->gatt_client_state = P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1150 send_gatt_characteristic_descriptor_request(gatt_client); 1151 #else 1152 case P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 1153 // Use Read By Type 1154 gatt_client->gatt_client_state = P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1155 send_gatt_read_client_characteristic_configuration_request(gatt_client); 1156 #endif 1157 return true; 1158 1159 case P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY: 1160 gatt_client->gatt_client_state = P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT; 1161 send_gatt_read_characteristic_descriptor_request(gatt_client); 1162 return true; 1163 1164 case P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY: 1165 gatt_client->gatt_client_state = P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT; 1166 send_gatt_read_blob_request(gatt_client); 1167 return true; 1168 1169 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 1170 gatt_client->gatt_client_state = P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1171 send_gatt_write_attribute_value_request(gatt_client); 1172 return true; 1173 1174 case P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION: 1175 gatt_client->gatt_client_state = P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT; 1176 send_gatt_write_client_characteristic_configuration_request(gatt_client); 1177 return true; 1178 1179 case P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR: 1180 gatt_client->gatt_client_state = P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1181 send_gatt_prepare_write_request(gatt_client); 1182 return true; 1183 1184 case P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR: 1185 gatt_client->gatt_client_state = P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1186 send_gatt_execute_write_request(gatt_client); 1187 return true; 1188 1189 #ifdef ENABLE_LE_SIGNED_WRITE 1190 case P_W4_IDENTITY_RESOLVING: 1191 log_info("P_W4_IDENTITY_RESOLVING - state %x", sm_identity_resolving_state(gatt_client->con_handle)); 1192 switch (sm_identity_resolving_state(gatt_client->con_handle)){ 1193 case IRK_LOOKUP_SUCCEEDED: 1194 gatt_client->le_device_index = sm_le_device_index(gatt_client->con_handle); 1195 gatt_client->gatt_client_state = P_W4_CMAC_READY; 1196 if (sm_cmac_ready()){ 1197 gatt_client_run_for_client_start_signed_write(gatt_client); 1198 } 1199 break; 1200 case IRK_LOOKUP_FAILED: 1201 gatt_client_handle_transaction_complete(gatt_client); 1202 emit_gatt_complete_event(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1203 break; 1204 default: 1205 break; 1206 } 1207 return false; 1208 1209 case P_W4_CMAC_READY: 1210 if (sm_cmac_ready()){ 1211 gatt_client_run_for_client_start_signed_write(gatt_client); 1212 } 1213 return false; 1214 1215 case P_W2_SEND_SIGNED_WRITE: { 1216 gatt_client->gatt_client_state = P_W4_SEND_SINGED_WRITE_DONE; 1217 // bump local signing counter 1218 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 1219 le_device_db_local_counter_set(gatt_client->le_device_index, sign_counter + 1); 1220 // send signed write command 1221 send_gatt_signed_write_request(gatt_client, sign_counter); 1222 // finally, notifiy client that write is complete 1223 gatt_client_handle_transaction_complete(gatt_client); 1224 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1225 return true; 1226 } 1227 #endif 1228 default: 1229 break; 1230 } 1231 1232 // write without response callback 1233 btstack_context_callback_registration_t * callback = 1234 (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->write_without_response_requests); 1235 if (callback != NULL){ 1236 (*callback->callback)(callback->context); 1237 return true; 1238 } 1239 1240 // requested can send now old 1241 if (gatt_client->write_without_response_callback){ 1242 btstack_packet_handler_t packet_handler = gatt_client->write_without_response_callback; 1243 gatt_client->write_without_response_callback = NULL; 1244 uint8_t event[4]; 1245 event[0] = GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE; 1246 event[1] = sizeof(event) - 2u; 1247 little_endian_store_16(event, 2, gatt_client->con_handle); 1248 packet_handler(HCI_EVENT_PACKET, gatt_client->con_handle, event, sizeof(event)); 1249 return true; // to trigger requeueing (even if higher layer didn't sent) 1250 } 1251 1252 return false; 1253 } 1254 1255 static void gatt_client_run(void){ 1256 btstack_linked_item_t *it; 1257 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 1258 gatt_client_t * gatt_client = (gatt_client_t *) it; 1259 #ifdef ENABLE_GATT_OVER_CLASSIC 1260 if (gatt_client->con_handle == HCI_CON_HANDLE_INVALID) { 1261 continue; 1262 } 1263 1264 // handle GATT over BR/EDR 1265 if (gatt_client->l2cap_psm != 0){ 1266 if (l2cap_can_send_packet_now(gatt_client->l2cap_cid) == false){ 1267 l2cap_request_can_send_now_event(gatt_client->l2cap_cid); 1268 return; 1269 } 1270 bool packet_sent = gatt_client_run_for_gatt_client(gatt_client); 1271 if (packet_sent){ 1272 // request new permission 1273 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1274 // requeue client for fairness and exit 1275 // note: iterator has become invalid 1276 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1277 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1278 return; 1279 } 1280 } 1281 continue; 1282 #endif 1283 // handle GATT over LE 1284 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) { 1285 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1286 return; 1287 } 1288 bool packet_sent = gatt_client_run_for_gatt_client(gatt_client); 1289 if (packet_sent){ 1290 // request new permission 1291 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1292 // requeue client for fairness and exit 1293 // note: iterator has become invalid 1294 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1295 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1296 return; 1297 } 1298 } 1299 } 1300 1301 static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code) { 1302 if (is_ready(gatt_client) == 1) return; 1303 gatt_client_handle_transaction_complete(gatt_client); 1304 emit_gatt_complete_event(gatt_client, att_error_code); 1305 } 1306 1307 static void gatt_client_handle_reencryption_complete(const uint8_t * packet){ 1308 hci_con_handle_t con_handle = sm_event_reencryption_complete_get_handle(packet); 1309 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 1310 if (gatt_client == NULL) return; 1311 1312 // update security level 1313 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 1314 1315 gatt_client->reencryption_result = sm_event_reencryption_complete_get_status(packet); 1316 gatt_client->reencryption_active = false; 1317 gatt_client->wait_for_authentication_complete = 0; 1318 1319 if (gatt_client->gatt_client_state == P_READY) return; 1320 1321 switch (sm_event_reencryption_complete_get_status(packet)){ 1322 case ERROR_CODE_SUCCESS: 1323 log_info("re-encryption success, retry operation"); 1324 break; 1325 case ERROR_CODE_AUTHENTICATION_FAILURE: 1326 case ERROR_CODE_PIN_OR_KEY_MISSING: 1327 #if defined(ENABLE_GATT_CLIENT_PAIRING) && !defined(ENABLE_LE_PROACTIVE_AUTHENTICATION) 1328 if (gatt_client_required_security_level == LEVEL_0) { 1329 // re-encryption failed for reactive authentication with pairing and we have a pending client request 1330 // => try to resolve it by deleting bonding information if we started pairing before 1331 // delete bonding information 1332 int le_device_db_index = sm_le_device_index(gatt_client->con_handle); 1333 btstack_assert(le_device_db_index >= 0); 1334 log_info("reactive auth with pairing: delete bonding and start pairing"); 1335 #ifdef ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION 1336 hci_remove_le_device_db_entry_from_resolving_list((uint16_t) le_device_db_index); 1337 #endif 1338 le_device_db_remove(le_device_db_index); 1339 // trigger pairing again 1340 sm_request_pairing(gatt_client->con_handle); 1341 break; 1342 } 1343 #endif 1344 // report bonding information missing 1345 gatt_client_handle_transaction_complete(gatt_client); 1346 emit_gatt_complete_event(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1347 break; 1348 default: 1349 // report bonding information missing 1350 gatt_client_handle_transaction_complete(gatt_client); 1351 emit_gatt_complete_event(gatt_client, gatt_client->pending_error_code); 1352 break; 1353 } 1354 } 1355 1356 static void gatt_client_handle_disconnection_complete(const uint8_t * packet){ 1357 log_info("GATT Client: HCI_EVENT_DISCONNECTION_COMPLETE"); 1358 hci_con_handle_t con_handle = little_endian_read_16(packet,3); 1359 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 1360 if (gatt_client == NULL) return; 1361 1362 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 1363 gatt_client_timeout_stop(gatt_client); 1364 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1365 btstack_memory_gatt_client_free(gatt_client); 1366 } 1367 1368 static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1369 UNUSED(channel); // ok: handling own l2cap events 1370 UNUSED(size); // ok: there is no channel 1371 1372 if (packet_type != HCI_EVENT_PACKET) return; 1373 1374 hci_con_handle_t con_handle; 1375 gatt_client_t * gatt_client; 1376 switch (hci_event_packet_get_type(packet)) { 1377 case HCI_EVENT_DISCONNECTION_COMPLETE: 1378 gatt_client_handle_disconnection_complete(packet); 1379 break; 1380 1381 // Pairing complete (with/without bonding=storing of pairing information) 1382 case SM_EVENT_PAIRING_COMPLETE: 1383 con_handle = sm_event_pairing_complete_get_handle(packet); 1384 gatt_client = gatt_client_get_context_for_handle(con_handle); 1385 if (gatt_client == NULL) break; 1386 1387 // update security level 1388 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 1389 1390 if (gatt_client->wait_for_authentication_complete){ 1391 gatt_client->wait_for_authentication_complete = 0; 1392 if (sm_event_pairing_complete_get_status(packet)){ 1393 log_info("pairing failed, report previous error 0x%x", gatt_client->pending_error_code); 1394 gatt_client_report_error_if_pending(gatt_client, gatt_client->pending_error_code); 1395 } else { 1396 log_info("pairing success, retry operation"); 1397 } 1398 } 1399 break; 1400 1401 #ifdef ENABLE_LE_SIGNED_WRITE 1402 // Identity Resolving completed (no code, gatt_client_run will continue) 1403 case SM_EVENT_IDENTITY_RESOLVING_SUCCEEDED: 1404 case SM_EVENT_IDENTITY_RESOLVING_FAILED: 1405 break; 1406 #endif 1407 1408 // re-encryption started 1409 case SM_EVENT_REENCRYPTION_STARTED: 1410 con_handle = sm_event_reencryption_complete_get_handle(packet); 1411 gatt_client = gatt_client_get_context_for_handle(con_handle); 1412 if (gatt_client == NULL) break; 1413 1414 gatt_client->reencryption_active = true; 1415 gatt_client->reencryption_result = ERROR_CODE_SUCCESS; 1416 break; 1417 1418 // re-encryption complete 1419 case SM_EVENT_REENCRYPTION_COMPLETE: 1420 gatt_client_handle_reencryption_complete(packet); 1421 break; 1422 default: 1423 break; 1424 } 1425 1426 gatt_client_run(); 1427 } 1428 1429 static void gatt_client_handle_att_read_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { 1430 switch (gatt_client->gatt_client_state) { 1431 case P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT: 1432 if (size >= 17) { 1433 uint8_t uuid128[16]; 1434 reverse_128(&packet[1], uuid128); 1435 report_gatt_included_service_uuid128(gatt_client, gatt_client->start_group_handle, uuid128); 1436 } 1437 trigger_next_included_service_query(gatt_client, gatt_client->start_group_handle); 1438 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1439 break; 1440 1441 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 1442 gatt_client_handle_transaction_complete(gatt_client); 1443 report_gatt_characteristic_value(gatt_client, gatt_client->attribute_handle, &packet[1], size - 1u); 1444 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1445 break; 1446 1447 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: 1448 gatt_client_handle_transaction_complete(gatt_client); 1449 report_gatt_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], 1450 size - 1u, 0u); 1451 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1452 break; 1453 1454 // Use ATT_READ_REQUEST for first blob of Read Long Characteristic 1455 case P_W4_READ_BLOB_RESULT: 1456 report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], 1457 size - 1u, gatt_client->attribute_offset); 1458 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, size - 1u); 1459 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1460 break; 1461 1462 // Use ATT_READ_REQUEST for first blob of Read Long Characteristic Descriptor 1463 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 1464 report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], 1465 size - 1u, gatt_client->attribute_offset); 1466 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, 1467 size - 1u); 1468 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1469 break; 1470 1471 default: 1472 break; 1473 } 1474 } 1475 1476 static void gatt_client_handle_att_read_by_type_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { 1477 switch (gatt_client->gatt_client_state) { 1478 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 1479 report_gatt_characteristics(gatt_client, packet, size); 1480 trigger_next_characteristic_query(gatt_client, 1481 get_last_result_handle_from_characteristics_list(packet, size)); 1482 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1483 break; 1484 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 1485 report_gatt_characteristics(gatt_client, packet, size); 1486 trigger_next_characteristic_query(gatt_client, 1487 get_last_result_handle_from_characteristics_list(packet, size)); 1488 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1489 break; 1490 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: { 1491 if (size < 2u) break; 1492 uint16_t uuid16 = 0; 1493 uint16_t pair_size = packet[1]; 1494 1495 if (pair_size == 6u) { 1496 if (size < 8u) break; 1497 // UUIDs not available, query first included service 1498 gatt_client->start_group_handle = little_endian_read_16(packet, 2); // ready for next query 1499 gatt_client->query_start_handle = little_endian_read_16(packet, 4); 1500 gatt_client->query_end_handle = little_endian_read_16(packet, 6); 1501 gatt_client->gatt_client_state = P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY; 1502 break; 1503 } 1504 1505 if (pair_size != 8u) break; 1506 1507 // UUIDs included, report all of them 1508 uint16_t offset; 1509 for (offset = 2u; (offset + 8u) <= size; offset += pair_size) { 1510 uint16_t include_handle = little_endian_read_16(packet, offset); 1511 gatt_client->query_start_handle = little_endian_read_16(packet, offset + 2u); 1512 gatt_client->query_end_handle = little_endian_read_16(packet, offset + 4u); 1513 uuid16 = little_endian_read_16(packet, offset + 6u); 1514 report_gatt_included_service_uuid16(gatt_client, include_handle, uuid16); 1515 } 1516 1517 trigger_next_included_service_query(gatt_client, 1518 get_last_result_handle_from_included_services_list(packet, 1519 size)); 1520 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1521 break; 1522 } 1523 #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1524 case P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT: 1525 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, 2); 1526 gatt_client->gatt_client_state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 1527 break; 1528 #endif 1529 case P_W4_READ_BY_TYPE_RESPONSE: { 1530 uint16_t pair_size = packet[1]; 1531 // set last result handle to last valid handle, only used if pair_size invalid 1532 uint16_t last_result_handle = 0xffff; 1533 if (pair_size > 2) { 1534 uint16_t offset; 1535 for (offset = 2; offset < size; offset += pair_size) { 1536 uint16_t value_handle = little_endian_read_16(packet, offset); 1537 report_gatt_characteristic_value(gatt_client, value_handle, &packet[offset + 2u], 1538 pair_size - 2u); 1539 last_result_handle = value_handle; 1540 } 1541 } 1542 trigger_next_read_by_type_query(gatt_client, last_result_handle); 1543 break; 1544 } 1545 default: 1546 break; 1547 } 1548 } 1549 1550 static void gatt_client_handle_att_write_response(gatt_client_t *gatt_client) { 1551 switch (gatt_client->gatt_client_state) { 1552 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 1553 gatt_client_handle_transaction_complete(gatt_client); 1554 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1555 break; 1556 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 1557 gatt_client_handle_transaction_complete(gatt_client); 1558 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1559 break; 1560 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1561 gatt_client_handle_transaction_complete(gatt_client); 1562 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1563 break; 1564 default: 1565 break; 1566 } 1567 } 1568 1569 static void gatt_client_handle_att_response(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size) { 1570 uint8_t error_code; 1571 switch (packet[0]) { 1572 case ATT_EXCHANGE_MTU_RESPONSE: { 1573 if (size < 3u) break; 1574 bool update_att_mtu = true; 1575 uint16_t remote_rx_mtu = little_endian_read_16(packet, 1); 1576 uint16_t local_rx_mtu = l2cap_max_le_mtu(); 1577 #ifdef ENABLE_GATT_OVER_CLASSIC 1578 if (gatt_client->l2cap_psm != 0){ 1579 local_rx_mtu = gatt_client->mtu; 1580 } else { 1581 update_att_mtu = false; 1582 } 1583 #endif 1584 uint16_t mtu = (remote_rx_mtu < local_rx_mtu) ? remote_rx_mtu : local_rx_mtu; 1585 1586 // set gatt client mtu 1587 gatt_client->mtu = mtu; 1588 gatt_client->mtu_state = MTU_EXCHANGED; 1589 1590 if (update_att_mtu){ 1591 // set per connection mtu state - for fixed channel 1592 hci_connection_t *hci_connection = hci_connection_for_handle(gatt_client->con_handle); 1593 hci_connection->att_connection.mtu = gatt_client->mtu; 1594 hci_connection->att_connection.mtu_exchanged = true; 1595 } 1596 emit_gatt_mtu_exchanged_result_event(gatt_client, gatt_client->mtu); 1597 break; 1598 } 1599 case ATT_READ_BY_GROUP_TYPE_RESPONSE: 1600 switch (gatt_client->gatt_client_state) { 1601 case P_W4_SERVICE_QUERY_RESULT: 1602 report_gatt_services(gatt_client, packet, size); 1603 trigger_next_service_query(gatt_client, get_last_result_handle_from_service_list(packet, size)); 1604 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1605 break; 1606 default: 1607 break; 1608 } 1609 break; 1610 case ATT_HANDLE_VALUE_NOTIFICATION: 1611 if (size < 3u) return; 1612 report_gatt_notification(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); 1613 return; 1614 case ATT_HANDLE_VALUE_INDICATION: 1615 if (size < 3u) break; 1616 report_gatt_indication(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); 1617 gatt_client->send_confirmation = 1; 1618 break; 1619 case ATT_READ_BY_TYPE_RESPONSE: 1620 gatt_client_handle_att_read_by_type_response(gatt_client, packet, size); 1621 break; 1622 case ATT_READ_RESPONSE: 1623 gatt_client_handle_att_read_response(gatt_client, packet, size); 1624 break; 1625 case ATT_FIND_BY_TYPE_VALUE_RESPONSE: { 1626 uint8_t pair_size = 4; 1627 int i; 1628 uint16_t start_group_handle; 1629 uint16_t end_group_handle = 0xffff; // asserts GATT_EVENT_QUERY_COMPLETE is emitted if no results 1630 for (i = 1u; (i + pair_size) <= size; i += pair_size) { 1631 start_group_handle = little_endian_read_16(packet, i); 1632 end_group_handle = little_endian_read_16(packet, i + 2); 1633 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, 1634 gatt_client->uuid128); 1635 } 1636 trigger_next_service_by_uuid_query(gatt_client, end_group_handle); 1637 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1638 break; 1639 } 1640 case ATT_FIND_INFORMATION_REPLY: { 1641 if (size < 2u) break; 1642 1643 uint8_t pair_size = 4; 1644 if (packet[1u] == 2u) { 1645 pair_size = 18; 1646 } 1647 uint16_t offset = 2; 1648 1649 if (size < (pair_size + offset)) break; 1650 uint16_t last_descriptor_handle = little_endian_read_16(packet, size - pair_size); 1651 1652 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1653 log_info("ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY, state %x", gatt_client->gatt_client_state); 1654 if (gatt_client->gatt_client_state == P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT){ 1655 // iterate over descriptors looking for CCC 1656 if (pair_size == 4){ 1657 while ((offset + 4) <= size){ 1658 uint16_t uuid16 = little_endian_read_16(packet, offset + 2); 1659 if (uuid16 == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION){ 1660 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, offset); 1661 gatt_client->gatt_client_state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 1662 log_info("CCC found %x", gatt_client->client_characteristic_configuration_handle); 1663 break; 1664 } 1665 offset += pair_size; 1666 } 1667 } 1668 if (is_query_done(gatt_client, last_descriptor_handle)){ 1669 1670 } else { 1671 // next 1672 gatt_client->start_group_handle = last_descriptor_handle + 1; 1673 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 1674 } 1675 break; 1676 } 1677 #endif 1678 report_gatt_all_characteristic_descriptors(gatt_client, &packet[2], size - 2u, pair_size); 1679 trigger_next_characteristic_descriptor_query(gatt_client, last_descriptor_handle); 1680 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1681 break; 1682 } 1683 1684 case ATT_WRITE_RESPONSE: 1685 gatt_client_handle_att_write_response(gatt_client); 1686 break; 1687 1688 case ATT_READ_BLOB_RESPONSE: { 1689 uint16_t received_blob_length = size - 1u; 1690 switch (gatt_client->gatt_client_state) { 1691 case P_W4_READ_BLOB_RESULT: 1692 report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], 1693 received_blob_length, gatt_client->attribute_offset); 1694 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, received_blob_length); 1695 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1696 break; 1697 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 1698 report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, 1699 &packet[1], received_blob_length, 1700 gatt_client->attribute_offset); 1701 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, 1702 received_blob_length); 1703 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1704 break; 1705 default: 1706 break; 1707 } 1708 break; 1709 } 1710 case ATT_PREPARE_WRITE_RESPONSE: 1711 switch (gatt_client->gatt_client_state) { 1712 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 1713 gatt_client_handle_transaction_complete(gatt_client); 1714 if (is_value_valid(gatt_client, packet, size)) { 1715 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1716 } else { 1717 emit_gatt_complete_event(gatt_client, ATT_ERROR_DATA_MISMATCH); 1718 } 1719 break; 1720 1721 case P_W4_PREPARE_WRITE_RESULT: { 1722 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 1723 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE, P_W2_EXECUTE_PREPARED_WRITE); 1724 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1725 break; 1726 } 1727 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: { 1728 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 1729 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR, 1730 P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR); 1731 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1732 break; 1733 } 1734 case P_W4_PREPARE_RELIABLE_WRITE_RESULT: { 1735 if (is_value_valid(gatt_client, packet, size)) { 1736 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 1737 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_RELIABLE_WRITE, 1738 P_W2_EXECUTE_PREPARED_WRITE); 1739 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1740 break; 1741 } 1742 gatt_client->gatt_client_state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 1743 break; 1744 } 1745 default: 1746 break; 1747 } 1748 break; 1749 1750 case ATT_EXECUTE_WRITE_RESPONSE: 1751 switch (gatt_client->gatt_client_state) { 1752 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 1753 gatt_client_handle_transaction_complete(gatt_client); 1754 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1755 break; 1756 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 1757 gatt_client_handle_transaction_complete(gatt_client); 1758 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1759 break; 1760 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 1761 gatt_client_handle_transaction_complete(gatt_client); 1762 emit_gatt_complete_event(gatt_client, ATT_ERROR_DATA_MISMATCH); 1763 break; 1764 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1765 gatt_client_handle_transaction_complete(gatt_client); 1766 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1767 break; 1768 default: 1769 break; 1770 1771 } 1772 break; 1773 1774 case ATT_READ_MULTIPLE_RESPONSE: 1775 switch (gatt_client->gatt_client_state) { 1776 case P_W4_READ_MULTIPLE_RESPONSE: 1777 report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); 1778 gatt_client_handle_transaction_complete(gatt_client); 1779 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1780 break; 1781 default: 1782 break; 1783 } 1784 break; 1785 1786 case ATT_ERROR_RESPONSE: 1787 if (size < 5u) return; 1788 error_code = packet[4]; 1789 switch (error_code) { 1790 case ATT_ERROR_ATTRIBUTE_NOT_FOUND: { 1791 switch (gatt_client->gatt_client_state) { 1792 case P_W4_SERVICE_QUERY_RESULT: 1793 case P_W4_SERVICE_WITH_UUID_RESULT: 1794 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: 1795 case P_W4_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT: 1796 gatt_client_handle_transaction_complete(gatt_client); 1797 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1798 break; 1799 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 1800 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 1801 characteristic_end_found(gatt_client, gatt_client->end_group_handle); 1802 gatt_client_handle_transaction_complete(gatt_client); 1803 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1804 break; 1805 case P_W4_READ_BY_TYPE_RESPONSE: 1806 gatt_client_handle_transaction_complete(gatt_client); 1807 if (gatt_client->start_group_handle == gatt_client->query_start_handle) { 1808 emit_gatt_complete_event(gatt_client, ATT_ERROR_ATTRIBUTE_NOT_FOUND); 1809 } else { 1810 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1811 } 1812 break; 1813 default: 1814 gatt_client_report_error_if_pending(gatt_client, error_code); 1815 break; 1816 } 1817 break; 1818 } 1819 1820 #ifdef ENABLE_GATT_CLIENT_PAIRING 1821 1822 case ATT_ERROR_INSUFFICIENT_AUTHENTICATION: 1823 case ATT_ERROR_INSUFFICIENT_ENCRYPTION_KEY_SIZE: 1824 case ATT_ERROR_INSUFFICIENT_ENCRYPTION: { 1825 1826 // security too low 1827 if (gatt_client->security_counter > 0) { 1828 gatt_client_report_error_if_pending(gatt_client, error_code); 1829 break; 1830 } 1831 // start security 1832 gatt_client->security_counter++; 1833 1834 // setup action 1835 int retry = 1; 1836 switch (gatt_client->gatt_client_state){ 1837 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 1838 gatt_client->gatt_client_state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY ; 1839 break; 1840 case P_W4_READ_BLOB_RESULT: 1841 gatt_client->gatt_client_state = P_W2_SEND_READ_BLOB_QUERY; 1842 break; 1843 case P_W4_READ_BY_TYPE_RESPONSE: 1844 gatt_client->gatt_client_state = P_W2_SEND_READ_BY_TYPE_REQUEST; 1845 break; 1846 case P_W4_READ_MULTIPLE_RESPONSE: 1847 gatt_client->gatt_client_state = P_W2_SEND_READ_MULTIPLE_REQUEST; 1848 break; 1849 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 1850 gatt_client->gatt_client_state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 1851 break; 1852 case P_W4_PREPARE_WRITE_RESULT: 1853 gatt_client->gatt_client_state = P_W2_PREPARE_WRITE; 1854 break; 1855 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 1856 gatt_client->gatt_client_state = P_W2_PREPARE_WRITE_SINGLE; 1857 break; 1858 case P_W4_PREPARE_RELIABLE_WRITE_RESULT: 1859 gatt_client->gatt_client_state = P_W2_PREPARE_RELIABLE_WRITE; 1860 break; 1861 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 1862 gatt_client->gatt_client_state = P_W2_EXECUTE_PREPARED_WRITE; 1863 break; 1864 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 1865 gatt_client->gatt_client_state = P_W2_CANCEL_PREPARED_WRITE; 1866 break; 1867 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 1868 gatt_client->gatt_client_state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 1869 break; 1870 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: 1871 gatt_client->gatt_client_state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 1872 break; 1873 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 1874 gatt_client->gatt_client_state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 1875 break; 1876 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1877 gatt_client->gatt_client_state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 1878 break; 1879 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 1880 gatt_client->gatt_client_state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 1881 break; 1882 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1883 gatt_client->gatt_client_state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 1884 break; 1885 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1886 gatt_client->gatt_client_state = P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR; 1887 break; 1888 #ifdef ENABLE_LE_SIGNED_WRITE 1889 case P_W4_SEND_SINGED_WRITE_DONE: 1890 gatt_client->gatt_client_state = P_W2_SEND_SIGNED_WRITE; 1891 break; 1892 #endif 1893 default: 1894 log_info("retry not supported for state %x", gatt_client->gatt_client_state); 1895 retry = 0; 1896 break; 1897 } 1898 1899 if (!retry) { 1900 gatt_client_report_error_if_pending(gatt_client, error_code); 1901 break; 1902 } 1903 1904 log_info("security error, start pairing"); 1905 1906 // start pairing for higher security level 1907 gatt_client->wait_for_authentication_complete = 1; 1908 gatt_client->pending_error_code = error_code; 1909 sm_request_pairing(gatt_client->con_handle); 1910 break; 1911 } 1912 #endif 1913 1914 // nothing we can do about that 1915 case ATT_ERROR_INSUFFICIENT_AUTHORIZATION: 1916 default: 1917 gatt_client_report_error_if_pending(gatt_client, error_code); 1918 break; 1919 } 1920 break; 1921 1922 default: 1923 log_info("ATT Handler, unhandled response type 0x%02x", packet[0]); 1924 break; 1925 } 1926 } 1927 1928 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size) { 1929 gatt_client_t *gatt_client; 1930 if (size < 1u) return; 1931 1932 if (packet_type == HCI_EVENT_PACKET) { 1933 switch (packet[0]) { 1934 case L2CAP_EVENT_CAN_SEND_NOW: 1935 gatt_client_run(); 1936 break; 1937 // att_server has negotiated the mtu for this connection, cache if context exists 1938 case ATT_EVENT_MTU_EXCHANGE_COMPLETE: 1939 if (size < 6u) break; 1940 gatt_client = gatt_client_get_context_for_handle(handle); 1941 if (gatt_client == NULL) break; 1942 gatt_client->mtu = little_endian_read_16(packet, 4); 1943 break; 1944 default: 1945 break; 1946 } 1947 return; 1948 } 1949 1950 if (packet_type != ATT_DATA_PACKET) return; 1951 1952 // special cases: notifications & indications motivate creating context 1953 switch (packet[0]) { 1954 case ATT_HANDLE_VALUE_NOTIFICATION: 1955 case ATT_HANDLE_VALUE_INDICATION: 1956 gatt_client_provide_context_for_handle(handle, &gatt_client); 1957 break; 1958 default: 1959 gatt_client = gatt_client_get_context_for_handle(handle); 1960 break; 1961 } 1962 1963 if (gatt_client != NULL) { 1964 gatt_client_handle_att_response(gatt_client, packet, size); 1965 gatt_client_run(); 1966 } 1967 } 1968 1969 #ifdef ENABLE_LE_SIGNED_WRITE 1970 static void att_signed_write_handle_cmac_result(uint8_t hash[8]){ 1971 btstack_linked_list_iterator_t it; 1972 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 1973 while (btstack_linked_list_iterator_has_next(&it)){ 1974 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 1975 if (gatt_client->gatt_client_state == P_W4_CMAC_RESULT){ 1976 // store result 1977 (void)memcpy(gatt_client->cmac, hash, 8); 1978 // reverse_64(hash, gatt_client->cmac); 1979 gatt_client->gatt_client_state = P_W2_SEND_SIGNED_WRITE; 1980 gatt_client_run(); 1981 return; 1982 } 1983 } 1984 } 1985 1986 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){ 1987 gatt_client_t * gatt_client; 1988 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 1989 if (status != ERROR_CODE_SUCCESS){ 1990 return status; 1991 } 1992 if (is_ready(gatt_client) == 0){ 1993 return GATT_CLIENT_IN_WRONG_STATE; 1994 } 1995 1996 gatt_client->callback = callback; 1997 gatt_client->attribute_handle = value_handle; 1998 gatt_client->attribute_length = message_len; 1999 gatt_client->attribute_value = message; 2000 gatt_client->gatt_client_state = P_W4_IDENTITY_RESOLVING; 2001 gatt_client_run(); 2002 return ERROR_CODE_SUCCESS; 2003 } 2004 #endif 2005 2006 uint8_t gatt_client_discover_primary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2007 gatt_client_t * gatt_client; 2008 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2009 if (status != ERROR_CODE_SUCCESS){ 2010 return status; 2011 } 2012 if (is_ready(gatt_client) == 0){ 2013 return GATT_CLIENT_IN_WRONG_STATE; 2014 } 2015 2016 gatt_client->callback = callback; 2017 gatt_client->start_group_handle = 0x0001; 2018 gatt_client->end_group_handle = 0xffff; 2019 gatt_client->gatt_client_state = P_W2_SEND_SERVICE_QUERY; 2020 gatt_client->uuid16 = GATT_PRIMARY_SERVICE_UUID; 2021 gatt_client_run(); 2022 return ERROR_CODE_SUCCESS; 2023 } 2024 2025 uint8_t gatt_client_discover_secondary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2026 gatt_client_t * gatt_client; 2027 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2028 if (status != ERROR_CODE_SUCCESS){ 2029 return status; 2030 } 2031 if (is_ready(gatt_client) == 0){ 2032 return GATT_CLIENT_IN_WRONG_STATE; 2033 } 2034 2035 gatt_client->callback = callback; 2036 gatt_client->start_group_handle = 0x0001; 2037 gatt_client->end_group_handle = 0xffff; 2038 gatt_client->gatt_client_state = P_W2_SEND_SERVICE_QUERY; 2039 gatt_client->uuid16 = GATT_SECONDARY_SERVICE_UUID; 2040 gatt_client_run(); 2041 return ERROR_CODE_SUCCESS; 2042 } 2043 2044 uint8_t gatt_client_discover_primary_services_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t uuid16){ 2045 gatt_client_t * gatt_client; 2046 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2047 if (status != ERROR_CODE_SUCCESS){ 2048 return status; 2049 } 2050 if (is_ready(gatt_client) == 0){ 2051 return GATT_CLIENT_IN_WRONG_STATE; 2052 } 2053 2054 gatt_client->callback = callback; 2055 gatt_client->start_group_handle = 0x0001; 2056 gatt_client->end_group_handle = 0xffff; 2057 gatt_client->gatt_client_state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 2058 gatt_client->uuid16 = uuid16; 2059 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), gatt_client->uuid16); 2060 gatt_client_run(); 2061 return ERROR_CODE_SUCCESS; 2062 } 2063 2064 uint8_t gatt_client_discover_primary_services_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, const uint8_t * uuid128){ 2065 gatt_client_t * gatt_client; 2066 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2067 if (status != ERROR_CODE_SUCCESS){ 2068 return status; 2069 } 2070 if (is_ready(gatt_client) == 0){ 2071 return GATT_CLIENT_IN_WRONG_STATE; 2072 } 2073 2074 gatt_client->callback = callback; 2075 gatt_client->start_group_handle = 0x0001; 2076 gatt_client->end_group_handle = 0xffff; 2077 gatt_client->uuid16 = 0; 2078 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2079 gatt_client->gatt_client_state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 2080 gatt_client_run(); 2081 return ERROR_CODE_SUCCESS; 2082 } 2083 2084 uint8_t gatt_client_discover_characteristics_for_service(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service){ 2085 gatt_client_t * gatt_client; 2086 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2087 if (status != ERROR_CODE_SUCCESS){ 2088 return status; 2089 } 2090 if (is_ready(gatt_client) == 0){ 2091 return GATT_CLIENT_IN_WRONG_STATE; 2092 } 2093 2094 gatt_client->callback = callback; 2095 gatt_client->start_group_handle = service->start_group_handle; 2096 gatt_client->end_group_handle = service->end_group_handle; 2097 gatt_client->filter_with_uuid = 0; 2098 gatt_client->characteristic_start_handle = 0; 2099 gatt_client->gatt_client_state = P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY; 2100 gatt_client_run(); 2101 return ERROR_CODE_SUCCESS; 2102 } 2103 2104 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){ 2105 gatt_client_t * gatt_client; 2106 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2107 if (status != ERROR_CODE_SUCCESS){ 2108 return status; 2109 } 2110 if (is_ready(gatt_client) == 0){ 2111 return GATT_CLIENT_IN_WRONG_STATE; 2112 } 2113 gatt_client->callback = callback; 2114 gatt_client->start_group_handle = service->start_group_handle; 2115 gatt_client->end_group_handle = service->end_group_handle; 2116 gatt_client->gatt_client_state = P_W2_SEND_INCLUDED_SERVICE_QUERY; 2117 2118 gatt_client_run(); 2119 return ERROR_CODE_SUCCESS; 2120 } 2121 2122 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){ 2123 gatt_client_t * gatt_client; 2124 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2125 if (status != ERROR_CODE_SUCCESS){ 2126 return status; 2127 } 2128 if (is_ready(gatt_client) == 0){ 2129 return GATT_CLIENT_IN_WRONG_STATE; 2130 } 2131 2132 gatt_client->callback = callback; 2133 gatt_client->start_group_handle = start_handle; 2134 gatt_client->end_group_handle = end_handle; 2135 gatt_client->filter_with_uuid = 1; 2136 gatt_client->uuid16 = uuid16; 2137 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 2138 gatt_client->characteristic_start_handle = 0; 2139 gatt_client->gatt_client_state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 2140 gatt_client_run(); 2141 return ERROR_CODE_SUCCESS; 2142 } 2143 2144 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){ 2145 gatt_client_t * gatt_client; 2146 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2147 if (status != ERROR_CODE_SUCCESS){ 2148 return status; 2149 } 2150 if (is_ready(gatt_client) == 0){ 2151 return GATT_CLIENT_IN_WRONG_STATE; 2152 } 2153 2154 gatt_client->callback = callback; 2155 gatt_client->start_group_handle = start_handle; 2156 gatt_client->end_group_handle = end_handle; 2157 gatt_client->filter_with_uuid = 1; 2158 gatt_client->uuid16 = 0; 2159 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2160 gatt_client->characteristic_start_handle = 0; 2161 gatt_client->gatt_client_state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 2162 gatt_client_run(); 2163 return ERROR_CODE_SUCCESS; 2164 } 2165 2166 2167 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){ 2168 return gatt_client_discover_characteristics_for_handle_range_by_uuid16(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid16); 2169 } 2170 2171 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){ 2172 return gatt_client_discover_characteristics_for_handle_range_by_uuid128(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid128); 2173 } 2174 2175 uint8_t gatt_client_discover_characteristic_descriptors(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 2176 gatt_client_t * gatt_client; 2177 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2178 if (status != ERROR_CODE_SUCCESS){ 2179 return status; 2180 } 2181 if (is_ready(gatt_client) == 0){ 2182 return GATT_CLIENT_IN_WRONG_STATE; 2183 } 2184 2185 if (characteristic->value_handle == characteristic->end_handle){ 2186 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 2187 return ERROR_CODE_SUCCESS; 2188 } 2189 gatt_client->callback = callback; 2190 gatt_client->start_group_handle = characteristic->value_handle + 1u; 2191 gatt_client->end_group_handle = characteristic->end_handle; 2192 gatt_client->gatt_client_state = P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY; 2193 gatt_client_run(); 2194 return ERROR_CODE_SUCCESS; 2195 } 2196 2197 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){ 2198 gatt_client_t * gatt_client; 2199 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2200 if (status != ERROR_CODE_SUCCESS){ 2201 return status; 2202 } 2203 if (is_ready(gatt_client) == 0){ 2204 return GATT_CLIENT_IN_WRONG_STATE; 2205 } 2206 2207 gatt_client->callback = callback; 2208 gatt_client->attribute_handle = value_handle; 2209 gatt_client->attribute_offset = 0; 2210 gatt_client->gatt_client_state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY; 2211 gatt_client_run(); 2212 return ERROR_CODE_SUCCESS; 2213 } 2214 2215 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){ 2216 gatt_client_t * gatt_client; 2217 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2218 if (status != ERROR_CODE_SUCCESS){ 2219 return status; 2220 } 2221 if (is_ready(gatt_client) == 0){ 2222 return GATT_CLIENT_IN_WRONG_STATE; 2223 } 2224 2225 gatt_client->callback = callback; 2226 gatt_client->start_group_handle = start_handle; 2227 gatt_client->end_group_handle = end_handle; 2228 gatt_client->query_start_handle = start_handle; 2229 gatt_client->query_end_handle = end_handle; 2230 gatt_client->uuid16 = uuid16; 2231 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 2232 gatt_client->gatt_client_state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2233 gatt_client_run(); 2234 return ERROR_CODE_SUCCESS; 2235 } 2236 2237 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){ 2238 gatt_client_t * gatt_client; 2239 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2240 if (status != ERROR_CODE_SUCCESS){ 2241 return status; 2242 } 2243 if (is_ready(gatt_client) == 0){ 2244 return GATT_CLIENT_IN_WRONG_STATE; 2245 } 2246 2247 gatt_client->callback = callback; 2248 gatt_client->start_group_handle = start_handle; 2249 gatt_client->end_group_handle = end_handle; 2250 gatt_client->query_start_handle = start_handle; 2251 gatt_client->query_end_handle = end_handle; 2252 gatt_client->uuid16 = 0; 2253 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2254 gatt_client->gatt_client_state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2255 gatt_client_run(); 2256 return ERROR_CODE_SUCCESS; 2257 } 2258 2259 2260 uint8_t gatt_client_read_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 2261 return gatt_client_read_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); 2262 } 2263 2264 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){ 2265 gatt_client_t * gatt_client; 2266 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2267 if (status != ERROR_CODE_SUCCESS){ 2268 return status; 2269 } 2270 if (is_ready(gatt_client) == 0){ 2271 return GATT_CLIENT_IN_WRONG_STATE; 2272 } 2273 2274 gatt_client->callback = callback; 2275 gatt_client->attribute_handle = value_handle; 2276 gatt_client->attribute_offset = offset; 2277 gatt_client->gatt_client_state = P_W2_SEND_READ_BLOB_QUERY; 2278 gatt_client_run(); 2279 return ERROR_CODE_SUCCESS; 2280 } 2281 2282 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){ 2283 return gatt_client_read_long_value_of_characteristic_using_value_handle_with_offset(callback, con_handle, value_handle, 0); 2284 } 2285 2286 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){ 2287 return gatt_client_read_long_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); 2288 } 2289 2290 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){ 2291 gatt_client_t * gatt_client; 2292 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2293 if (status != ERROR_CODE_SUCCESS){ 2294 return status; 2295 } 2296 if (is_ready(gatt_client) == 0){ 2297 return GATT_CLIENT_IN_WRONG_STATE; 2298 } 2299 2300 gatt_client->callback = callback; 2301 gatt_client->read_multiple_handle_count = num_value_handles; 2302 gatt_client->read_multiple_handles = value_handles; 2303 gatt_client->gatt_client_state = P_W2_SEND_READ_MULTIPLE_REQUEST; 2304 gatt_client_run(); 2305 return ERROR_CODE_SUCCESS; 2306 } 2307 2308 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){ 2309 gatt_client_t * gatt_client; 2310 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2311 if (status != ERROR_CODE_SUCCESS){ 2312 return status; 2313 } 2314 2315 if (value_length > (gatt_client->mtu - 3u)) return GATT_CLIENT_VALUE_TOO_LONG; 2316 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) return GATT_CLIENT_BUSY; 2317 2318 return att_write_request(gatt_client, ATT_WRITE_COMMAND, value_handle, value_length, value); 2319 } 2320 2321 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){ 2322 gatt_client_t * gatt_client; 2323 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2324 if (status != ERROR_CODE_SUCCESS){ 2325 return status; 2326 } 2327 if (is_ready(gatt_client) == 0){ 2328 return GATT_CLIENT_IN_WRONG_STATE; 2329 } 2330 2331 gatt_client->callback = callback; 2332 gatt_client->attribute_handle = value_handle; 2333 gatt_client->attribute_length = value_length; 2334 gatt_client->attribute_value = value; 2335 gatt_client->gatt_client_state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 2336 gatt_client_run(); 2337 return ERROR_CODE_SUCCESS; 2338 } 2339 2340 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){ 2341 gatt_client_t * gatt_client; 2342 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2343 if (status != ERROR_CODE_SUCCESS){ 2344 return status; 2345 } 2346 if (is_ready(gatt_client) == 0){ 2347 return GATT_CLIENT_IN_WRONG_STATE; 2348 } 2349 2350 gatt_client->callback = callback; 2351 gatt_client->attribute_handle = value_handle; 2352 gatt_client->attribute_length = value_length; 2353 gatt_client->attribute_offset = offset; 2354 gatt_client->attribute_value = value; 2355 gatt_client->gatt_client_state = P_W2_PREPARE_WRITE; 2356 gatt_client_run(); 2357 return ERROR_CODE_SUCCESS; 2358 } 2359 2360 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){ 2361 return gatt_client_write_long_value_of_characteristic_with_offset(callback, con_handle, value_handle, 0, value_length, value); 2362 } 2363 2364 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){ 2365 gatt_client_t * gatt_client; 2366 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2367 if (status != ERROR_CODE_SUCCESS){ 2368 return status; 2369 } 2370 if (is_ready(gatt_client) == 0){ 2371 return GATT_CLIENT_IN_WRONG_STATE; 2372 } 2373 2374 gatt_client->callback = callback; 2375 gatt_client->attribute_handle = value_handle; 2376 gatt_client->attribute_length = value_length; 2377 gatt_client->attribute_offset = 0; 2378 gatt_client->attribute_value = value; 2379 gatt_client->gatt_client_state = P_W2_PREPARE_RELIABLE_WRITE; 2380 gatt_client_run(); 2381 return ERROR_CODE_SUCCESS; 2382 } 2383 2384 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){ 2385 gatt_client_t * gatt_client; 2386 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2387 if (status != ERROR_CODE_SUCCESS){ 2388 return status; 2389 } 2390 if (is_ready(gatt_client) == 0){ 2391 return GATT_CLIENT_IN_WRONG_STATE; 2392 } 2393 2394 if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION) && 2395 ((characteristic->properties & ATT_PROPERTY_NOTIFY) == 0u)) { 2396 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED"); 2397 return GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED; 2398 } else if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION) && 2399 ((characteristic->properties & ATT_PROPERTY_INDICATE) == 0u)){ 2400 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED"); 2401 return GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED; 2402 } 2403 2404 gatt_client->callback = callback; 2405 gatt_client->start_group_handle = characteristic->value_handle; 2406 gatt_client->end_group_handle = characteristic->end_handle; 2407 little_endian_store_16(gatt_client->client_characteristic_configuration_value, 0, configuration); 2408 2409 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 2410 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2411 #else 2412 gatt_client->gatt_client_state = P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2413 #endif 2414 gatt_client_run(); 2415 return ERROR_CODE_SUCCESS; 2416 } 2417 2418 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){ 2419 gatt_client_t * gatt_client; 2420 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2421 if (status != ERROR_CODE_SUCCESS){ 2422 return status; 2423 } 2424 if (is_ready(gatt_client) == 0){ 2425 return GATT_CLIENT_IN_WRONG_STATE; 2426 } 2427 2428 gatt_client->callback = callback; 2429 gatt_client->attribute_handle = descriptor_handle; 2430 2431 gatt_client->gatt_client_state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 2432 gatt_client_run(); 2433 return ERROR_CODE_SUCCESS; 2434 } 2435 2436 uint8_t gatt_client_read_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor){ 2437 return gatt_client_read_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2438 } 2439 2440 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){ 2441 gatt_client_t * gatt_client; 2442 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2443 if (status != ERROR_CODE_SUCCESS){ 2444 return status; 2445 } 2446 if (is_ready(gatt_client) == 0){ 2447 return GATT_CLIENT_IN_WRONG_STATE; 2448 } 2449 2450 gatt_client->callback = callback; 2451 gatt_client->attribute_handle = descriptor_handle; 2452 gatt_client->attribute_offset = offset; 2453 gatt_client->gatt_client_state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 2454 gatt_client_run(); 2455 return ERROR_CODE_SUCCESS; 2456 } 2457 2458 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){ 2459 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0); 2460 } 2461 2462 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){ 2463 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2464 } 2465 2466 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){ 2467 gatt_client_t * gatt_client; 2468 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2469 if (status != ERROR_CODE_SUCCESS){ 2470 return status; 2471 } 2472 if (is_ready(gatt_client) == 0){ 2473 return GATT_CLIENT_IN_WRONG_STATE; 2474 } 2475 2476 gatt_client->callback = callback; 2477 gatt_client->attribute_handle = descriptor_handle; 2478 gatt_client->attribute_length = value_length; 2479 gatt_client->attribute_offset = 0; 2480 gatt_client->attribute_value = value; 2481 gatt_client->gatt_client_state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 2482 gatt_client_run(); 2483 return ERROR_CODE_SUCCESS; 2484 } 2485 2486 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){ 2487 return gatt_client_write_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); 2488 } 2489 2490 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){ 2491 gatt_client_t * gatt_client; 2492 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2493 if (status != ERROR_CODE_SUCCESS){ 2494 return status; 2495 } 2496 if (is_ready(gatt_client) == 0){ 2497 return GATT_CLIENT_IN_WRONG_STATE; 2498 } 2499 2500 gatt_client->callback = callback; 2501 gatt_client->attribute_handle = descriptor_handle; 2502 gatt_client->attribute_length = value_length; 2503 gatt_client->attribute_offset = offset; 2504 gatt_client->attribute_value = value; 2505 gatt_client->gatt_client_state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 2506 gatt_client_run(); 2507 return ERROR_CODE_SUCCESS; 2508 } 2509 2510 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){ 2511 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0, value_length, value); 2512 } 2513 2514 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){ 2515 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); 2516 } 2517 2518 /** 2519 * @brief -> gatt complete event 2520 */ 2521 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){ 2522 gatt_client_t * gatt_client; 2523 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2524 if (status != ERROR_CODE_SUCCESS){ 2525 return status; 2526 } 2527 if (is_ready(gatt_client) == 0){ 2528 return GATT_CLIENT_IN_WRONG_STATE; 2529 } 2530 2531 gatt_client->callback = callback; 2532 gatt_client->attribute_handle = attribute_handle; 2533 gatt_client->attribute_length = value_length; 2534 gatt_client->attribute_offset = offset; 2535 gatt_client->attribute_value = value; 2536 gatt_client->gatt_client_state = P_W2_PREPARE_WRITE_SINGLE; 2537 gatt_client_run(); 2538 return ERROR_CODE_SUCCESS; 2539 } 2540 2541 /** 2542 * @brief -> gatt complete event 2543 */ 2544 uint8_t gatt_client_execute_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2545 gatt_client_t * gatt_client; 2546 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2547 if (status != ERROR_CODE_SUCCESS){ 2548 return status; 2549 } 2550 if (is_ready(gatt_client) == 0){ 2551 return GATT_CLIENT_IN_WRONG_STATE; 2552 } 2553 2554 gatt_client->callback = callback; 2555 gatt_client->gatt_client_state = P_W2_EXECUTE_PREPARED_WRITE; 2556 gatt_client_run(); 2557 return ERROR_CODE_SUCCESS; 2558 } 2559 2560 /** 2561 * @brief -> gatt complete event 2562 */ 2563 uint8_t gatt_client_cancel_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2564 gatt_client_t * gatt_client; 2565 uint8_t status = gatt_client_provide_context_for_handle_and_start_timer(con_handle, &gatt_client); 2566 if (status != ERROR_CODE_SUCCESS){ 2567 return status; 2568 } 2569 if (is_ready(gatt_client) == 0){ 2570 return GATT_CLIENT_IN_WRONG_STATE; 2571 } 2572 2573 gatt_client->callback = callback; 2574 gatt_client->gatt_client_state = P_W2_CANCEL_PREPARED_WRITE; 2575 gatt_client_run(); 2576 return ERROR_CODE_SUCCESS; 2577 } 2578 2579 void gatt_client_deserialize_service(const uint8_t *packet, int offset, gatt_client_service_t * service){ 2580 service->start_group_handle = little_endian_read_16(packet, offset); 2581 service->end_group_handle = little_endian_read_16(packet, offset + 2); 2582 reverse_128(&packet[offset + 4], service->uuid128); 2583 if (uuid_has_bluetooth_prefix(service->uuid128)){ 2584 service->uuid16 = big_endian_read_32(service->uuid128, 0); 2585 } else { 2586 service->uuid16 = 0; 2587 } 2588 } 2589 2590 void gatt_client_deserialize_characteristic(const uint8_t * packet, int offset, gatt_client_characteristic_t * characteristic){ 2591 characteristic->start_handle = little_endian_read_16(packet, offset); 2592 characteristic->value_handle = little_endian_read_16(packet, offset + 2); 2593 characteristic->end_handle = little_endian_read_16(packet, offset + 4); 2594 characteristic->properties = little_endian_read_16(packet, offset + 6); 2595 reverse_128(&packet[offset+8], characteristic->uuid128); 2596 if (uuid_has_bluetooth_prefix(characteristic->uuid128)){ 2597 characteristic->uuid16 = big_endian_read_32(characteristic->uuid128, 0); 2598 } else { 2599 characteristic->uuid16 = 0; 2600 } 2601 } 2602 2603 void gatt_client_deserialize_characteristic_descriptor(const uint8_t * packet, int offset, gatt_client_characteristic_descriptor_t * descriptor){ 2604 descriptor->handle = little_endian_read_16(packet, offset); 2605 reverse_128(&packet[offset+2], descriptor->uuid128); 2606 if (uuid_has_bluetooth_prefix(descriptor->uuid128)){ 2607 descriptor->uuid16 = big_endian_read_32(descriptor->uuid128, 0); 2608 } else { 2609 descriptor->uuid16 = 0; 2610 } 2611 } 2612 2613 void gatt_client_send_mtu_negotiation(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2614 gatt_client_t * gatt_client; 2615 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2616 if (status != ERROR_CODE_SUCCESS){ 2617 return; 2618 } 2619 if (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED){ 2620 gatt_client->callback = callback; 2621 gatt_client->mtu_state = SEND_MTU_EXCHANGE; 2622 gatt_client_run(); 2623 } 2624 } 2625 2626 uint8_t gatt_client_request_to_write_without_response(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 2627 gatt_client_t * gatt_client; 2628 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2629 if (status != ERROR_CODE_SUCCESS){ 2630 return status; 2631 } 2632 bool added = btstack_linked_list_add_tail(&gatt_client->write_without_response_requests, (btstack_linked_item_t*) callback_registration); 2633 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 2634 if (added){ 2635 return ERROR_CODE_SUCCESS; 2636 } else { 2637 return ERROR_CODE_COMMAND_DISALLOWED; 2638 } 2639 } 2640 2641 uint8_t gatt_client_request_to_send_gatt_query(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 2642 gatt_client_t * gatt_client; 2643 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2644 if (status != ERROR_CODE_SUCCESS){ 2645 return status; 2646 } 2647 bool added = btstack_linked_list_add_tail(&gatt_client->query_requests, (btstack_linked_item_t*) callback_registration); 2648 gatt_client_notify_can_send_query(gatt_client); 2649 if (added){ 2650 return ERROR_CODE_SUCCESS; 2651 } else { 2652 return ERROR_CODE_COMMAND_DISALLOWED; 2653 } 2654 } 2655 2656 uint8_t gatt_client_request_can_write_without_response_event(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2657 gatt_client_t * gatt_client; 2658 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2659 if (status != ERROR_CODE_SUCCESS){ 2660 return status; 2661 } 2662 if (gatt_client->write_without_response_callback != NULL){ 2663 return GATT_CLIENT_IN_WRONG_STATE; 2664 } 2665 gatt_client->write_without_response_callback = callback; 2666 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 2667 return ERROR_CODE_SUCCESS; 2668 } 2669 2670 #ifdef ENABLE_GATT_OVER_CLASSIC 2671 2672 #include "hci_event.h" 2673 2674 // single active SDP query 2675 static gatt_client_t * gatt_client_classic_active_sdp_query; 2676 2677 // macos protocol descriptor list requires 16 bytes 2678 static uint8_t gatt_client_classic_sdp_buffer[32]; 2679 2680 static const hci_event_t gatt_client_connected = { 2681 GATT_EVENT_CONNECTED, 0, "1BH" 2682 }; 2683 2684 static const hci_event_t gatt_client_disconnected = { 2685 GATT_EVENT_DISCONNECTED, 0, "H" 2686 }; 2687 2688 static gatt_client_t * gatt_client_get_context_for_classic_addr(bd_addr_t addr){ 2689 btstack_linked_item_t *it; 2690 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 2691 gatt_client_t * gatt_client = (gatt_client_t *) it; 2692 if (memcmp(gatt_client->addr, addr, 6) == 0){ 2693 return gatt_client; 2694 } 2695 } 2696 return NULL; 2697 } 2698 2699 static gatt_client_t * gatt_client_get_context_for_l2cap_cid(uint16_t l2cap_cid){ 2700 btstack_linked_item_t *it; 2701 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 2702 gatt_client_t * gatt_client = (gatt_client_t *) it; 2703 if (gatt_client->l2cap_cid == l2cap_cid){ 2704 return gatt_client; 2705 } 2706 } 2707 return NULL; 2708 } 2709 2710 static void gatt_client_classic_handle_connected(gatt_client_t * gatt_client, uint8_t status){ 2711 bd_addr_t addr; 2712 memcpy(addr, gatt_client->addr, 6); 2713 hci_con_handle_t con_handle = gatt_client->con_handle; 2714 btstack_packet_handler_t callback = gatt_client->callback; 2715 if (status != ERROR_CODE_SUCCESS){ 2716 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 2717 btstack_memory_gatt_client_free(gatt_client); 2718 } 2719 uint8_t buffer[20]; 2720 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_connected, status, addr, 2721 con_handle); 2722 (*callback)(HCI_EVENT_PACKET, 0, buffer, len); 2723 } 2724 2725 static void gatt_client_classic_handle_disconnected(gatt_client_t * gatt_client){ 2726 2727 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 2728 gatt_client_timeout_stop(gatt_client); 2729 2730 hci_con_handle_t con_handle = gatt_client->con_handle; 2731 btstack_packet_handler_t callback = gatt_client->callback; 2732 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 2733 btstack_memory_gatt_client_free(gatt_client); 2734 2735 uint8_t buffer[20]; 2736 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_disconnected, con_handle); 2737 (*callback)(HCI_EVENT_PACKET, 0, buffer, len); 2738 } 2739 2740 static void gatt_client_l2cap_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 2741 gatt_client_t * gatt_client = NULL; 2742 uint8_t status; 2743 switch (packet_type){ 2744 case HCI_EVENT_PACKET: 2745 switch (hci_event_packet_get_type(packet)) { 2746 case L2CAP_EVENT_CHANNEL_OPENED: 2747 status = l2cap_event_channel_opened_get_status(packet); 2748 gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_opened_get_local_cid(packet)); 2749 btstack_assert(gatt_client != NULL); 2750 // if status != 0, gatt_client will be discarded 2751 gatt_client->gatt_client_state = P_READY; 2752 gatt_client->con_handle = l2cap_event_channel_opened_get_handle(packet); 2753 gatt_client->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); 2754 gatt_client_classic_handle_connected(gatt_client, status); 2755 break; 2756 case L2CAP_EVENT_CHANNEL_CLOSED: 2757 gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_closed_get_local_cid(packet)); 2758 gatt_client_classic_handle_disconnected(gatt_client); 2759 break; 2760 default: 2761 break; 2762 } 2763 break; 2764 case L2CAP_DATA_PACKET: 2765 gatt_client = gatt_client_get_context_for_l2cap_cid(channel); 2766 btstack_assert(gatt_client != NULL); 2767 gatt_client_handle_att_response(gatt_client, packet, size); 2768 gatt_client_run(); 2769 break; 2770 } 2771 } 2772 2773 static void gatt_client_handle_sdp_client_query_attribute_value(gatt_client_t * connection, uint8_t *packet){ 2774 des_iterator_t des_list_it; 2775 des_iterator_t prot_it; 2776 2777 if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= sizeof(gatt_client_classic_sdp_buffer)) { 2778 gatt_client_classic_sdp_buffer[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); 2779 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)) { 2780 switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) { 2781 case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST: 2782 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)) { 2783 uint8_t *des_element; 2784 uint8_t *element; 2785 uint32_t uuid; 2786 2787 if (des_iterator_get_type(&des_list_it) != DE_DES) continue; 2788 2789 des_element = des_iterator_get_element(&des_list_it); 2790 des_iterator_init(&prot_it, des_element); 2791 element = des_iterator_get_element(&prot_it); 2792 2793 if (de_get_element_type(element) != DE_UUID) continue; 2794 2795 uuid = de_get_uuid32(element); 2796 des_iterator_next(&prot_it); 2797 // we assume that the even if there are both roles supported, remote device uses the same psm and avdtp version for both 2798 switch (uuid){ 2799 case BLUETOOTH_PROTOCOL_L2CAP: 2800 if (!des_iterator_has_more(&prot_it)) continue; 2801 de_element_get_uint16(des_iterator_get_element(&prot_it), &connection->l2cap_psm); 2802 break; 2803 default: 2804 break; 2805 } 2806 } 2807 break; 2808 2809 default: 2810 break; 2811 } 2812 } 2813 } 2814 } 2815 2816 static void gatt_client_classic_sdp_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 2817 gatt_client_t * gatt_client = gatt_client_classic_active_sdp_query; 2818 btstack_assert(gatt_client != NULL); 2819 uint8_t status; 2820 2821 // TODO: handle sdp events, get l2cap psm 2822 switch (hci_event_packet_get_type(packet)){ 2823 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: 2824 gatt_client_handle_sdp_client_query_attribute_value(gatt_client, packet); 2825 // TODO: 2826 return; 2827 case SDP_EVENT_QUERY_COMPLETE: 2828 status = sdp_event_query_complete_get_status(packet); 2829 gatt_client_classic_active_sdp_query = NULL; 2830 log_info("l2cap psm: %0x, status %02x", gatt_client->l2cap_psm, status); 2831 if (status != ERROR_CODE_SUCCESS) break; 2832 if (gatt_client->l2cap_psm == 0) { 2833 status = SDP_SERVICE_NOT_FOUND; 2834 break; 2835 } 2836 break; 2837 default: 2838 btstack_assert(false); 2839 return; 2840 } 2841 2842 // done 2843 if (status == ERROR_CODE_SUCCESS){ 2844 gatt_client->gatt_client_state = P_W4_L2CAP_CONNECTION; 2845 status = l2cap_create_channel(gatt_client_l2cap_handler, gatt_client->addr, gatt_client->l2cap_psm, 0xffff, 2846 &gatt_client->l2cap_cid); 2847 } 2848 if (status != ERROR_CODE_SUCCESS) { 2849 gatt_client_classic_handle_connected(gatt_client, status); 2850 } 2851 } 2852 2853 static void gatt_client_classic_sdp_start(void * context){ 2854 gatt_client_classic_active_sdp_query = (gatt_client_t *) context; 2855 gatt_client_classic_active_sdp_query->gatt_client_state = P_W4_SDP_QUERY; 2856 sdp_client_query_uuid16(gatt_client_classic_sdp_handler, gatt_client_classic_active_sdp_query->addr, ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 2857 } 2858 2859 uint8_t gatt_client_classic_connect(btstack_packet_handler_t callback, bd_addr_t addr){ 2860 gatt_client_t * gatt_client = gatt_client_get_context_for_classic_addr(addr); 2861 if (gatt_client != NULL){ 2862 return ERROR_CODE_ACL_CONNECTION_ALREADY_EXISTS; 2863 } 2864 gatt_client = btstack_memory_gatt_client_get(); 2865 if (gatt_client == NULL){ 2866 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 2867 } 2868 // init state 2869 gatt_client->con_handle = HCI_CON_HANDLE_INVALID; 2870 memcpy(gatt_client->addr, addr, 6); 2871 gatt_client->mtu = ATT_DEFAULT_MTU; 2872 gatt_client->security_level = LEVEL_0; 2873 gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 2874 gatt_client->gatt_client_state = P_W2_SDP_QUERY; 2875 gatt_client->sdp_query_request.callback = &gatt_client_classic_sdp_start; 2876 gatt_client->sdp_query_request.context = gatt_client; 2877 gatt_client->callback = callback; 2878 btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); 2879 sdp_client_register_query_callback(&gatt_client->sdp_query_request); 2880 return ERROR_CODE_COMMAND_DISALLOWED; 2881 } 2882 2883 uint8_t gatt_client_classic_disconnect(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2884 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 2885 if (gatt_client == NULL){ 2886 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2887 } 2888 gatt_client->callback = callback; 2889 return l2cap_disconnect(gatt_client->l2cap_cid); 2890 } 2891 #endif 2892 2893 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 2894 void gatt_client_att_packet_handler_fuzz(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 2895 gatt_client_att_packet_handler(packet_type, handle, packet, size); 2896 } 2897 2898 uint8_t gatt_client_get_client(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 2899 uint8_t status = gatt_client_provide_context_for_handle(con_handle, out_gatt_client); 2900 return status; 2901 } 2902 #endif 2903