1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN 24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "gatt_client.c" 39 40 #include <stdint.h> 41 #include <string.h> 42 #include <stddef.h> 43 44 #include "btstack_config.h" 45 46 #include "ble/att_dispatch.h" 47 #include "ble/att_db.h" 48 #include "ble/gatt_client.h" 49 #include "ble/le_device_db.h" 50 #include "ble/sm.h" 51 #include "bluetooth_psm.h" 52 #include "btstack_debug.h" 53 #include "btstack_event.h" 54 #include "btstack_memory.h" 55 #include "btstack_run_loop.h" 56 #include "btstack_util.h" 57 #include "hci.h" 58 #include "hci_dump.h" 59 #include "hci_event_builder.h" 60 #include "l2cap.h" 61 #include "classic/sdp_client.h" 62 #include "bluetooth_gatt.h" 63 #include "bluetooth_sdp.h" 64 #include "classic/sdp_util.h" 65 66 #if defined(ENABLE_GATT_OVER_EATT) && !defined(ENABLE_L2CAP_ENHANCED_CREDIT_BASED_FLOW_CONTROL_MODE) 67 #error "GATT Over EATT requires support for L2CAP Enhanced CoC. Please enable ENABLE_L2CAP_ENHANCED_CREDIT_BASED_FLOW_CONTROL_MODE" 68 #endif 69 70 // L2CAP Test Spec p35 defines a minimum of 100 ms, but PTS might indicate an error if we sent after 100 ms 71 #define GATT_CLIENT_COLLISION_BACKOFF_MS 150 72 73 static btstack_linked_list_t gatt_client_connections; 74 static btstack_linked_list_t gatt_client_value_listeners; 75 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 76 static btstack_linked_list_t gatt_client_service_changed_handler; 77 #endif 78 static btstack_packet_callback_registration_t hci_event_callback_registration; 79 static btstack_packet_callback_registration_t sm_event_callback_registration; 80 static btstack_context_callback_registration_t gatt_client_deferred_event_emit; 81 82 // GATT Client Configuration 83 static bool gatt_client_mtu_exchange_enabled; 84 static gap_security_level_t gatt_client_required_security_level; 85 86 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size); 87 static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 88 static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code); 89 90 #ifdef ENABLE_LE_SIGNED_WRITE 91 static void att_signed_write_handle_cmac_result(uint8_t hash[8]); 92 #endif 93 94 #ifdef ENABLE_GATT_OVER_CLASSIC 95 static gatt_client_t * gatt_client_get_context_for_l2cap_cid(uint16_t l2cap_cid); 96 static void gatt_client_classic_handle_connected(gatt_client_t * gatt_client, uint8_t status); 97 static void gatt_client_classic_handle_disconnected(gatt_client_t * gatt_client); 98 static void gatt_client_classic_retry(btstack_timer_source_t * ts); 99 #endif 100 101 #ifdef ENABLE_GATT_OVER_EATT 102 static bool gatt_client_le_enhanced_handle_can_send_query(gatt_client_t * gatt_client); 103 static void gatt_client_le_enhanced_retry(btstack_timer_source_t * ts); 104 #endif 105 106 void gatt_client_init(void){ 107 gatt_client_connections = NULL; 108 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 109 gatt_client_service_changed_handler = NULL; 110 #endif 111 // default configuration 112 gatt_client_mtu_exchange_enabled = true; 113 gatt_client_required_security_level = LEVEL_0; 114 115 // register for HCI Events 116 hci_event_callback_registration.callback = &gatt_client_event_packet_handler; 117 hci_add_event_handler(&hci_event_callback_registration); 118 119 // register for SM Events 120 sm_event_callback_registration.callback = &gatt_client_event_packet_handler; 121 sm_add_event_handler(&sm_event_callback_registration); 122 123 // and ATT Client PDUs 124 att_dispatch_register_client(gatt_client_att_packet_handler); 125 } 126 127 void gatt_client_set_required_security_level(gap_security_level_t level){ 128 gatt_client_required_security_level = level; 129 } 130 131 static gatt_client_t * gatt_client_for_timer(btstack_timer_source_t * ts){ 132 btstack_linked_list_iterator_t it; 133 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 134 while (btstack_linked_list_iterator_has_next(&it)){ 135 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 136 if (&gatt_client->gc_timeout == ts) { 137 return gatt_client; 138 } 139 } 140 return NULL; 141 } 142 143 static void gatt_client_timeout_handler(btstack_timer_source_t * timer){ 144 gatt_client_t * gatt_client = gatt_client_for_timer(timer); 145 if (gatt_client == NULL) return; 146 log_info("GATT client timeout handle, handle 0x%02x", gatt_client->con_handle); 147 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_TIMEOUT); 148 } 149 150 static void gatt_client_timeout_start(gatt_client_t * gatt_client){ 151 log_debug("GATT client timeout start, handle 0x%02x", gatt_client->con_handle); 152 btstack_run_loop_remove_timer(&gatt_client->gc_timeout); 153 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_timeout_handler); 154 btstack_run_loop_set_timer(&gatt_client->gc_timeout, 30000); // 30 seconds sm timeout 155 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 156 } 157 158 static void gatt_client_timeout_stop(gatt_client_t * gatt_client){ 159 log_debug("GATT client timeout stop, handle 0x%02x", gatt_client->con_handle); 160 btstack_run_loop_remove_timer(&gatt_client->gc_timeout); 161 } 162 163 static gap_security_level_t gatt_client_le_security_level_for_connection(hci_con_handle_t con_handle){ 164 uint8_t encryption_key_size = gap_encryption_key_size(con_handle); 165 if (encryption_key_size == 0) return LEVEL_0; 166 167 bool authenticated = gap_authenticated(con_handle); 168 if (!authenticated) return LEVEL_2; 169 170 return encryption_key_size == 16 ? LEVEL_4 : LEVEL_3; 171 } 172 173 static gatt_client_t * gatt_client_get_context_for_handle(uint16_t handle){ 174 btstack_linked_item_t *it; 175 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 176 gatt_client_t * gatt_client = (gatt_client_t *) it; 177 if (gatt_client->con_handle == handle){ 178 return gatt_client; 179 } 180 } 181 return NULL; 182 } 183 184 185 // @return gatt_client context 186 // returns existing one, or tries to setup new one 187 static uint8_t gatt_client_provide_context_for_handle(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 188 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 189 190 if (gatt_client != NULL){ 191 *out_gatt_client = gatt_client; 192 return ERROR_CODE_SUCCESS; 193 } 194 195 // bail if no such hci connection 196 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 197 if (hci_connection == NULL){ 198 log_error("No connection for handle 0x%04x", con_handle); 199 *out_gatt_client = NULL; 200 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 201 } 202 203 gatt_client = btstack_memory_gatt_client_get(); 204 if (gatt_client == NULL){ 205 *out_gatt_client = NULL; 206 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 207 } 208 // init state 209 gatt_client->bearer_type = ATT_BEARER_UNENHANCED_LE; 210 gatt_client->con_handle = con_handle; 211 gatt_client->mtu = ATT_DEFAULT_MTU; 212 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 213 if (gatt_client_mtu_exchange_enabled){ 214 gatt_client->mtu_state = SEND_MTU_EXCHANGE; 215 } else { 216 gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 217 } 218 gatt_client->state = P_READY; 219 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_W2_SEND; 220 #ifdef ENABLE_GATT_OVER_EATT 221 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 222 #endif 223 btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); 224 225 // get unenhanced att bearer state 226 if (hci_connection->att_connection.mtu_exchanged){ 227 gatt_client->mtu = hci_connection->att_connection.mtu; 228 gatt_client->mtu_state = MTU_EXCHANGED; 229 } 230 *out_gatt_client = gatt_client; 231 return ERROR_CODE_SUCCESS; 232 } 233 234 static bool is_ready(gatt_client_t * gatt_client){ 235 return gatt_client->state == P_READY; 236 } 237 238 static uint8_t gatt_client_provide_context_for_request(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 239 gatt_client_t * gatt_client = NULL; 240 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 241 if (status != ERROR_CODE_SUCCESS){ 242 return status; 243 } 244 245 #ifdef ENABLE_GATT_OVER_EATT 246 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY){ 247 btstack_linked_list_iterator_t it; 248 gatt_client_t * eatt_client = NULL; 249 // find free eatt client 250 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 251 while (btstack_linked_list_iterator_has_next(&it)){ 252 gatt_client_t * client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 253 if (client->state == P_READY){ 254 eatt_client = client; 255 break; 256 } 257 } 258 if (eatt_client == NULL){ 259 return ERROR_CODE_COMMAND_DISALLOWED; 260 } 261 gatt_client = eatt_client; 262 } 263 #endif 264 265 if (is_ready(gatt_client) == false){ 266 return GATT_CLIENT_IN_WRONG_STATE; 267 } 268 269 gatt_client_timeout_start(gatt_client); 270 271 *out_gatt_client = gatt_client; 272 273 return status; 274 } 275 276 int gatt_client_is_ready(hci_con_handle_t con_handle){ 277 gatt_client_t * gatt_client; 278 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 279 if (status != ERROR_CODE_SUCCESS){ 280 return 0; 281 } 282 return is_ready(gatt_client) ? 1 : 0; 283 } 284 285 void gatt_client_mtu_enable_auto_negotiation(uint8_t enabled){ 286 gatt_client_mtu_exchange_enabled = enabled != 0; 287 } 288 289 uint8_t gatt_client_get_mtu(hci_con_handle_t con_handle, uint16_t * mtu){ 290 gatt_client_t * gatt_client; 291 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 292 if (status != ERROR_CODE_SUCCESS){ 293 return status; 294 } 295 296 if ((gatt_client->mtu_state == MTU_EXCHANGED) || (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED)){ 297 *mtu = gatt_client->mtu; 298 return ERROR_CODE_SUCCESS; 299 } 300 *mtu = ATT_DEFAULT_MTU; 301 return GATT_CLIENT_IN_WRONG_STATE; 302 } 303 304 static uint8_t *gatt_client_reserve_request_buffer(gatt_client_t *gatt_client) { 305 switch (gatt_client->bearer_type){ 306 #ifdef ENABLE_GATT_OVER_CLASSIC 307 case ATT_BEARER_UNENHANCED_CLASSIC: 308 #endif 309 case ATT_BEARER_UNENHANCED_LE: 310 l2cap_reserve_packet_buffer(); 311 return l2cap_get_outgoing_buffer(); 312 #ifdef ENABLE_GATT_OVER_EATT 313 case ATT_BEARER_ENHANCED_LE: 314 return gatt_client->eatt_storage_buffer; 315 #endif 316 default: 317 btstack_unreachable(); 318 break; 319 } 320 return NULL; 321 } 322 323 // precondition: can_send_packet_now == TRUE 324 static uint8_t gatt_client_send(gatt_client_t * gatt_client, uint16_t len){ 325 switch (gatt_client->bearer_type){ 326 case ATT_BEARER_UNENHANCED_LE: 327 return l2cap_send_prepared_connectionless(gatt_client->con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, len); 328 #ifdef ENABLE_GATT_OVER_CLASSIC 329 case ATT_BEARER_UNENHANCED_CLASSIC: 330 return l2cap_send_prepared(gatt_client->l2cap_cid, len); 331 #endif 332 #ifdef ENABLE_GATT_OVER_EATT 333 case ATT_BEARER_ENHANCED_LE: 334 return l2cap_send(gatt_client->l2cap_cid, gatt_client->eatt_storage_buffer, len); 335 #endif 336 default: 337 btstack_unreachable(); 338 return ERROR_CODE_HARDWARE_FAILURE; 339 } 340 } 341 342 // precondition: can_send_packet_now == TRUE 343 static uint8_t att_confirmation(gatt_client_t * gatt_client) { 344 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 345 346 request[0] = ATT_HANDLE_VALUE_CONFIRMATION; 347 348 return gatt_client_send(gatt_client, 1); 349 } 350 351 // precondition: can_send_packet_now == TRUE 352 static uint8_t att_find_information_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t start_handle, 353 uint16_t end_handle) { 354 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 355 356 request[0] = request_type; 357 little_endian_store_16(request, 1, start_handle); 358 little_endian_store_16(request, 3, end_handle); 359 360 return gatt_client_send(gatt_client, 5); 361 } 362 363 // precondition: can_send_packet_now == TRUE 364 static uint8_t 365 att_find_by_type_value_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_group_type, 366 uint16_t start_handle, uint16_t end_handle, uint8_t *value, uint16_t value_size) { 367 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 368 request[0] = request_type; 369 370 little_endian_store_16(request, 1, start_handle); 371 little_endian_store_16(request, 3, end_handle); 372 little_endian_store_16(request, 5, attribute_group_type); 373 (void)memcpy(&request[7], value, value_size); 374 375 return gatt_client_send(gatt_client, 7u + value_size); 376 } 377 378 // precondition: can_send_packet_now == TRUE 379 static uint8_t 380 att_read_by_type_or_group_request_for_uuid16(gatt_client_t *gatt_client, uint8_t request_type, uint16_t uuid16, 381 uint16_t start_handle, uint16_t end_handle) { 382 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 383 384 request[0] = request_type; 385 little_endian_store_16(request, 1, start_handle); 386 little_endian_store_16(request, 3, end_handle); 387 little_endian_store_16(request, 5, uuid16); 388 389 return gatt_client_send(gatt_client, 7); 390 } 391 392 // precondition: can_send_packet_now == TRUE 393 static uint8_t 394 att_read_by_type_or_group_request_for_uuid128(gatt_client_t *gatt_client, uint8_t request_type, const uint8_t *uuid128, 395 uint16_t start_handle, uint16_t end_handle) { 396 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 397 398 request[0] = request_type; 399 little_endian_store_16(request, 1, start_handle); 400 little_endian_store_16(request, 3, end_handle); 401 reverse_128(uuid128, &request[5]); 402 403 return gatt_client_send(gatt_client, 21); 404 } 405 406 // precondition: can_send_packet_now == TRUE 407 static uint8_t att_read_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle) { 408 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 409 410 request[0] = request_type; 411 little_endian_store_16(request, 1, attribute_handle); 412 413 return gatt_client_send(gatt_client, 3); 414 } 415 416 // precondition: can_send_packet_now == TRUE 417 static uint8_t att_read_blob_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, 418 uint16_t value_offset) { 419 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 420 421 request[0] = request_type; 422 little_endian_store_16(request, 1, attribute_handle); 423 little_endian_store_16(request, 3, value_offset); 424 425 return gatt_client_send(gatt_client, 5); 426 } 427 428 static uint8_t 429 att_read_multiple_request_with_opcode(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles, uint8_t opcode) { 430 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 431 432 request[0] = opcode; 433 uint16_t i; 434 uint16_t offset = 1; 435 for (i=0;i<num_value_handles;i++){ 436 little_endian_store_16(request, offset, value_handles[i]); 437 offset += 2; 438 } 439 440 return gatt_client_send(gatt_client, offset); 441 } 442 443 static uint8_t 444 att_read_multiple_request(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles) { 445 return att_read_multiple_request_with_opcode(gatt_client, num_value_handles, value_handles, ATT_READ_MULTIPLE_REQUEST); 446 } 447 448 #ifdef ENABLE_GATT_OVER_EATT 449 static uint8_t 450 att_read_multiple_variable_request(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles) { 451 return att_read_multiple_request_with_opcode(gatt_client, num_value_handles, value_handles, ATT_READ_MULTIPLE_VARIABLE_REQ); 452 } 453 #endif 454 455 #ifdef ENABLE_LE_SIGNED_WRITE 456 // precondition: can_send_packet_now == TRUE 457 static uint8_t att_signed_write_request(gatt_client_t *gatt_client, uint16_t request_type, uint16_t attribute_handle, 458 uint16_t value_length, uint8_t *value, uint32_t sign_counter, uint8_t sgn[8]) { 459 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 460 461 request[0] = request_type; 462 little_endian_store_16(request, 1, attribute_handle); 463 (void)memcpy(&request[3], value, value_length); 464 little_endian_store_32(request, 3 + value_length, sign_counter); 465 reverse_64(sgn, &request[3 + value_length + 4]); 466 467 return gatt_client_send(gatt_client, 3 + value_length + 12); 468 } 469 #endif 470 471 // precondition: can_send_packet_now == TRUE 472 static uint8_t 473 att_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, uint16_t value_length, 474 uint8_t *value) { 475 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 476 477 request[0] = request_type; 478 little_endian_store_16(request, 1, attribute_handle); 479 (void)memcpy(&request[3], value, value_length); 480 481 return gatt_client_send(gatt_client, 3u + value_length); 482 } 483 484 // precondition: can_send_packet_now == TRUE 485 static uint8_t att_execute_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint8_t execute_write) { 486 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 487 488 request[0] = request_type; 489 request[1] = execute_write; 490 491 return gatt_client_send(gatt_client, 2); 492 } 493 494 // precondition: can_send_packet_now == TRUE 495 static uint8_t att_prepare_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, 496 uint16_t value_offset, uint16_t blob_length, uint8_t *value) { 497 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 498 499 request[0] = request_type; 500 little_endian_store_16(request, 1, attribute_handle); 501 little_endian_store_16(request, 3, value_offset); 502 (void)memcpy(&request[5], &value[value_offset], blob_length); 503 504 return gatt_client_send(gatt_client, 5u + blob_length); 505 } 506 507 static uint8_t att_exchange_mtu_request(gatt_client_t *gatt_client) { 508 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 509 510 request[0] = ATT_EXCHANGE_MTU_REQUEST; 511 uint16_t mtu = l2cap_max_le_mtu(); 512 little_endian_store_16(request, 1, mtu); 513 514 return gatt_client_send(gatt_client, 3); 515 } 516 517 static uint16_t write_blob_length(gatt_client_t * gatt_client){ 518 uint16_t max_blob_length = gatt_client->mtu - 5u; 519 if (gatt_client->attribute_offset >= gatt_client->attribute_length) { 520 return 0; 521 } 522 uint16_t rest_length = gatt_client->attribute_length - gatt_client->attribute_offset; 523 if (max_blob_length > rest_length){ 524 return rest_length; 525 } 526 return max_blob_length; 527 } 528 529 static void send_gatt_services_request(gatt_client_t *gatt_client){ 530 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_GROUP_TYPE_REQUEST, 531 gatt_client->uuid16, gatt_client->start_group_handle, 532 gatt_client->end_group_handle); 533 } 534 535 static void send_gatt_by_uuid_request(gatt_client_t *gatt_client, uint16_t attribute_group_type){ 536 if (gatt_client->uuid16 != 0u){ 537 uint8_t uuid16[2]; 538 little_endian_store_16(uuid16, 0, gatt_client->uuid16); 539 att_find_by_type_value_request(gatt_client, ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, 540 gatt_client->start_group_handle, gatt_client->end_group_handle, uuid16, 2); 541 return; 542 } 543 uint8_t uuid128[16]; 544 reverse_128(gatt_client->uuid128, uuid128); 545 att_find_by_type_value_request(gatt_client, ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, 546 gatt_client->start_group_handle, gatt_client->end_group_handle, uuid128, 16); 547 } 548 549 static void send_gatt_services_by_uuid_request(gatt_client_t *gatt_client){ 550 send_gatt_by_uuid_request(gatt_client, GATT_PRIMARY_SERVICE_UUID); 551 } 552 553 static void send_gatt_included_service_uuid_request(gatt_client_t *gatt_client){ 554 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->query_start_handle); 555 } 556 557 static void send_gatt_included_service_request(gatt_client_t *gatt_client){ 558 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 559 GATT_INCLUDE_SERVICE_UUID, gatt_client->start_group_handle, 560 gatt_client->end_group_handle); 561 } 562 563 static void send_gatt_characteristic_request(gatt_client_t *gatt_client){ 564 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 565 GATT_CHARACTERISTICS_UUID, gatt_client->start_group_handle, 566 gatt_client->end_group_handle); 567 } 568 569 static void send_gatt_characteristic_descriptor_request(gatt_client_t *gatt_client){ 570 att_find_information_request(gatt_client, ATT_FIND_INFORMATION_REQUEST, gatt_client->start_group_handle, 571 gatt_client->end_group_handle); 572 } 573 574 static void send_gatt_read_characteristic_value_request(gatt_client_t *gatt_client){ 575 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 576 } 577 578 static void send_gatt_read_by_type_request(gatt_client_t * gatt_client){ 579 if (gatt_client->uuid16 != 0u){ 580 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 581 gatt_client->uuid16, gatt_client->start_group_handle, 582 gatt_client->end_group_handle); 583 } else { 584 att_read_by_type_or_group_request_for_uuid128(gatt_client, ATT_READ_BY_TYPE_REQUEST, 585 gatt_client->uuid128, gatt_client->start_group_handle, 586 gatt_client->end_group_handle); 587 } 588 } 589 590 static void send_gatt_read_blob_request(gatt_client_t *gatt_client){ 591 if (gatt_client->attribute_offset == 0){ 592 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 593 } else { 594 att_read_blob_request(gatt_client, ATT_READ_BLOB_REQUEST, gatt_client->attribute_handle, 595 gatt_client->attribute_offset); 596 } 597 } 598 599 static void send_gatt_read_multiple_request(gatt_client_t * gatt_client){ 600 att_read_multiple_request(gatt_client, gatt_client->read_multiple_handle_count, gatt_client->read_multiple_handles); 601 } 602 603 #ifdef ENABLE_GATT_OVER_EATT 604 static void send_gatt_read_multiple_variable_request(gatt_client_t * gatt_client){ 605 att_read_multiple_variable_request(gatt_client, gatt_client->read_multiple_handle_count, gatt_client->read_multiple_handles); 606 } 607 #endif 608 609 static void send_gatt_write_attribute_value_request(gatt_client_t * gatt_client){ 610 att_write_request(gatt_client, ATT_WRITE_REQUEST, gatt_client->attribute_handle, gatt_client->attribute_length, 611 gatt_client->attribute_value); 612 } 613 614 static void send_gatt_write_client_characteristic_configuration_request(gatt_client_t * gatt_client){ 615 att_write_request(gatt_client, ATT_WRITE_REQUEST, gatt_client->client_characteristic_configuration_handle, 2, 616 gatt_client->client_characteristic_configuration_value); 617 } 618 619 static void send_gatt_prepare_write_request(gatt_client_t * gatt_client){ 620 att_prepare_write_request(gatt_client, ATT_PREPARE_WRITE_REQUEST, gatt_client->attribute_handle, 621 gatt_client->attribute_offset, write_blob_length(gatt_client), 622 gatt_client->attribute_value); 623 } 624 625 static void send_gatt_execute_write_request(gatt_client_t * gatt_client){ 626 att_execute_write_request(gatt_client, ATT_EXECUTE_WRITE_REQUEST, 1); 627 } 628 629 static void send_gatt_cancel_prepared_write_request(gatt_client_t * gatt_client){ 630 att_execute_write_request(gatt_client, ATT_EXECUTE_WRITE_REQUEST, 0); 631 } 632 633 #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 634 static void send_gatt_read_client_characteristic_configuration_request(gatt_client_t * gatt_client){ 635 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 636 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION, 637 gatt_client->start_group_handle, gatt_client->end_group_handle); 638 } 639 #endif 640 641 static void send_gatt_read_characteristic_descriptor_request(gatt_client_t * gatt_client){ 642 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 643 } 644 645 #ifdef ENABLE_LE_SIGNED_WRITE 646 static void send_gatt_signed_write_request(gatt_client_t * gatt_client, uint32_t sign_counter){ 647 att_signed_write_request(gatt_client, ATT_SIGNED_WRITE_COMMAND, gatt_client->attribute_handle, 648 gatt_client->attribute_length, gatt_client->attribute_value, sign_counter, 649 gatt_client->cmac); 650 } 651 #endif 652 653 static uint16_t get_last_result_handle_from_service_list(uint8_t * packet, uint16_t size){ 654 if (size < 2) return 0xffff; 655 uint8_t attr_length = packet[1]; 656 if ((2 + attr_length) > size) return 0xffff; 657 return little_endian_read_16(packet, size - attr_length + 2u); 658 } 659 660 static uint16_t get_last_result_handle_from_characteristics_list(uint8_t * packet, uint16_t size){ 661 if (size < 2) return 0xffff; 662 uint8_t attr_length = packet[1]; 663 if ((2 + attr_length) > size) return 0xffff; 664 return little_endian_read_16(packet, size - attr_length + 3u); 665 } 666 667 static uint16_t get_last_result_handle_from_included_services_list(uint8_t * packet, uint16_t size){ 668 if (size < 2) return 0xffff; 669 uint8_t attr_length = packet[1]; 670 if ((2 + attr_length) > size) return 0xffff; 671 return little_endian_read_16(packet, size - attr_length); 672 } 673 674 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 675 static void gatt_client_service_emit_event(gatt_client_t * gatt_client, uint8_t * event, uint16_t size){ 676 btstack_linked_list_iterator_t it; 677 btstack_linked_list_iterator_init(&it, &gatt_client_service_changed_handler); 678 while (btstack_linked_list_iterator_has_next(&it)) { 679 btstack_packet_callback_registration_t *callback = (btstack_packet_callback_registration_t *) btstack_linked_list_iterator_next(&it); 680 (*callback->callback)(HCI_EVENT_PACKET, (uint16_t) gatt_client->con_handle, event, size); 681 } 682 } 683 684 static void 685 gatt_client_service_emit_database_hash(gatt_client_t *gatt_client, const uint8_t *value, uint16_t value_len) { 686 if (value_len == 16){ 687 uint8_t event[21]; 688 hci_event_builder_context_t context; 689 hci_event_builder_init(&context, event, sizeof(event), HCI_EVENT_GATTSERVICE_META, GATTSERVICE_SUBEVENT_GATT_DATABASE_HASH); 690 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 691 hci_event_builder_add_bytes(&context, value, 16); 692 gatt_client_service_emit_event(gatt_client, event, hci_event_builder_get_length(&context)); 693 } 694 } 695 696 static void 697 gatt_client_service_emit_service_changed(gatt_client_t *gatt_client, const uint8_t *value, uint16_t value_len) { 698 if (value_len == 4){ 699 uint8_t event[9]; 700 hci_event_builder_context_t context; 701 hci_event_builder_init(&context, event, sizeof(event), HCI_EVENT_GATTSERVICE_META, GATTSERVICE_SUBEVENT_GATT_SERVICE_CHANGED); 702 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 703 hci_event_builder_add_bytes(&context, value, 4); 704 gatt_client_service_emit_event(gatt_client, event, hci_event_builder_get_length(&context)); 705 } 706 } 707 708 static void gatt_client_service_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 709 UNUSED(channel); // ok: handling own l2cap events 710 UNUSED(size); // ok: there is no channel 711 712 hci_con_handle_t con_handle; 713 gatt_client_t *gatt_client; 714 gatt_client_service_t service; 715 gatt_client_characteristic_t characteristic; 716 switch (packet_type) { 717 case HCI_EVENT_PACKET: 718 switch (hci_event_packet_get_type(packet)) { 719 case GATT_EVENT_SERVICE_QUERY_RESULT: 720 con_handle = gatt_event_service_query_result_get_handle(packet); 721 gatt_client = gatt_client_get_context_for_handle(con_handle); 722 btstack_assert(gatt_client != NULL); 723 btstack_assert(gatt_client->gatt_service_state == GATT_CLIENT_SERVICE_DISCOVER_W4_DONE); 724 gatt_event_service_query_result_get_service(packet, &service); 725 gatt_client->gatt_service_start_group_handle = service.start_group_handle; 726 gatt_client->gatt_service_end_group_handle = service.end_group_handle; 727 break; 728 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 729 con_handle = gatt_event_characteristic_query_result_get_handle(packet); 730 gatt_client = gatt_client_get_context_for_handle(con_handle); 731 btstack_assert(gatt_client != NULL); 732 btstack_assert(gatt_client->gatt_service_state == GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W4_DONE); 733 gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic); 734 switch (characteristic.uuid16){ 735 case ORG_BLUETOOTH_CHARACTERISTIC_GATT_SERVICE_CHANGED: 736 gatt_client->gatt_service_changed_value_handle = characteristic.value_handle; 737 gatt_client->gatt_service_changed_end_handle = characteristic.end_handle; 738 break; 739 case ORG_BLUETOOTH_CHARACTERISTIC_DATABASE_HASH: 740 gatt_client->gatt_service_database_hash_value_handle = characteristic.value_handle; 741 gatt_client->gatt_service_database_hash_end_handle = characteristic.end_handle; 742 break; 743 default: 744 break; 745 } 746 break; 747 case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: 748 con_handle = gatt_event_characteristic_value_query_result_get_handle(packet); 749 gatt_client = gatt_client_get_context_for_handle(con_handle); 750 btstack_assert(gatt_client != NULL); 751 btstack_assert(gatt_client->gatt_service_state == GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W4_DONE); 752 gatt_client_service_emit_database_hash(gatt_client, 753 gatt_event_characteristic_value_query_result_get_value(packet), 754 gatt_event_characteristic_value_query_result_get_value_length(packet)); 755 break; 756 case GATT_EVENT_QUERY_COMPLETE: 757 con_handle = gatt_event_query_complete_get_handle(packet); 758 gatt_client = gatt_client_get_context_for_handle(con_handle); 759 btstack_assert(gatt_client != NULL); 760 switch (gatt_client->gatt_service_state) { 761 case GATT_CLIENT_SERVICE_DISCOVER_W4_DONE: 762 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W2_SEND; 763 break; 764 case GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W4_DONE: 765 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W2_SEND; 766 break; 767 case GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W4_DONE: 768 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W2_SEND; 769 break; 770 case GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W4_DONE: 771 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W2_SEND; 772 break; 773 case GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W4_DONE: 774 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DONE; 775 break; 776 default: 777 btstack_unreachable(); 778 break; 779 } 780 break; 781 default: 782 break; 783 } 784 break; 785 default: 786 break; 787 } 788 } 789 #endif 790 791 static void gatt_client_notify_can_send_query(gatt_client_t * gatt_client){ 792 793 #ifdef ENABLE_GATT_OVER_EATT 794 // if eatt is ready, notify all clients that can send a query 795 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY){ 796 btstack_linked_list_iterator_t it; 797 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 798 while (btstack_linked_list_iterator_has_next(&it)){ 799 gatt_client_t * client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 800 if (client->state == P_READY){ 801 // call callback 802 btstack_context_callback_registration_t * callback = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->query_requests); 803 if (callback == NULL) { 804 return; 805 } 806 (*callback->callback)(callback->context); 807 } 808 } 809 return; 810 } 811 #endif 812 813 while (gatt_client->state == P_READY){ 814 bool query_sent = false; 815 UNUSED(query_sent); 816 817 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 818 uint8_t status = ERROR_CODE_SUCCESS; 819 gatt_client_service_t gatt_service; 820 gatt_client_characteristic_t characteristic; 821 switch (gatt_client->gatt_service_state){ 822 case GATT_CLIENT_SERVICE_DISCOVER_W2_SEND: 823 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_W4_DONE; 824 status = gatt_client_discover_primary_services_by_uuid16(&gatt_client_service_packet_handler, 825 gatt_client->con_handle, 826 ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 827 query_sent = true; 828 break; 829 case GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W2_SEND: 830 if (gatt_client->gatt_service_start_group_handle != 0){ 831 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W4_DONE; 832 gatt_service.start_group_handle = gatt_client->gatt_service_start_group_handle; 833 gatt_service.end_group_handle = gatt_client->gatt_service_end_group_handle; 834 status = gatt_client_discover_characteristics_for_service(&gatt_client_service_packet_handler, gatt_client->con_handle, &gatt_service); 835 query_sent = true; 836 break; 837 } 838 839 /* fall through */ 840 841 case GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W2_SEND: 842 if (gatt_client->gatt_service_changed_value_handle != 0){ 843 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W4_DONE; 844 characteristic.value_handle = gatt_client->gatt_service_changed_value_handle; 845 characteristic.end_handle = gatt_client->gatt_service_changed_end_handle; 846 // we assume good case. We cannot do much otherwise 847 characteristic.properties = ATT_PROPERTY_INDICATE; 848 status = gatt_client_write_client_characteristic_configuration(&gatt_client_service_packet_handler, 849 gatt_client->con_handle, &characteristic, 850 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION); 851 query_sent = true; 852 break; 853 } 854 855 /* fall through */ 856 857 case GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W2_SEND: 858 if (gatt_client->gatt_service_database_hash_value_handle != 0){ 859 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W4_DONE; 860 status = gatt_client_read_value_of_characteristics_by_uuid16(&gatt_client_service_packet_handler, 861 gatt_client->con_handle, 862 0x0001, 0xffff, ORG_BLUETOOTH_CHARACTERISTIC_DATABASE_HASH); 863 query_sent = true; 864 break; 865 } 866 867 /* fall through */ 868 869 case GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W2_SEND: 870 if (gatt_client->gatt_service_database_hash_value_handle != 0) { 871 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W4_DONE; 872 characteristic.value_handle = gatt_client->gatt_service_database_hash_value_handle; 873 characteristic.end_handle = gatt_client->gatt_service_database_hash_end_handle; 874 // we assume good case. We cannot do much otherwise 875 characteristic.properties = ATT_PROPERTY_INDICATE; 876 status = gatt_client_write_client_characteristic_configuration(&gatt_client_service_packet_handler, 877 gatt_client->con_handle, 878 &characteristic, 879 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION); 880 query_sent = true; 881 break; 882 } 883 884 // DONE 885 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DONE; 886 break; 887 default: 888 break; 889 } 890 btstack_assert(status == ERROR_CODE_SUCCESS); 891 UNUSED(status); 892 if (query_sent){ 893 continue; 894 } 895 #endif 896 897 #ifdef ENABLE_GATT_OVER_EATT 898 query_sent = gatt_client_le_enhanced_handle_can_send_query(gatt_client); 899 if (query_sent){ 900 continue; 901 } 902 #endif 903 btstack_context_callback_registration_t * callback = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->query_requests); 904 if (callback == NULL) { 905 return; 906 } 907 (*callback->callback)(callback->context); 908 } 909 } 910 911 // test if notification/indication should be delivered to application (BLESA) 912 static bool gatt_client_accept_server_message(gatt_client_t *gatt_client) { 913 // ignore messages until re-encryption is complete 914 if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return false; 915 916 // after that ignore if bonded but not encrypted 917 return !gap_bonded(gatt_client->con_handle) || (gap_encryption_key_size(gatt_client->con_handle) > 0); 918 } 919 920 static void emit_event_new(btstack_packet_handler_t callback, uint8_t * packet, uint16_t size){ 921 if (!callback) return; 922 hci_dump_btstack_event(packet, size); 923 (*callback)(HCI_EVENT_PACKET, 0, packet, size); 924 } 925 926 static void emit_event_to_registered_listeners(hci_con_handle_t con_handle, uint16_t attribute_handle, uint8_t * packet, uint16_t size){ 927 btstack_linked_list_iterator_t it; 928 btstack_linked_list_iterator_init(&it, &gatt_client_value_listeners); 929 while (btstack_linked_list_iterator_has_next(&it)){ 930 gatt_client_notification_t * notification = (gatt_client_notification_t*) btstack_linked_list_iterator_next(&it); 931 if ((notification->con_handle != GATT_CLIENT_ANY_CONNECTION) && (notification->con_handle != con_handle)) continue; 932 if ((notification->attribute_handle != GATT_CLIENT_ANY_VALUE_HANDLE) && (notification->attribute_handle != attribute_handle)) continue; 933 (*notification->callback)(HCI_EVENT_PACKET, 0, packet, size); 934 } 935 } 936 937 static void emit_gatt_complete_event(gatt_client_t * gatt_client, uint8_t att_status){ 938 // @format H1 939 uint8_t packet[5]; 940 hci_event_builder_context_t context; 941 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_QUERY_COMPLETE, 0); 942 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 943 hci_event_builder_add_08(&context, att_status); 944 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 945 } 946 947 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){ 948 // @format HX 949 uint8_t packet[24]; 950 hci_event_builder_context_t context; 951 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_SERVICE_QUERY_RESULT, 0); 952 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 953 hci_event_builder_add_16(&context, start_group_handle); 954 hci_event_builder_add_16(&context, end_group_handle); 955 hci_event_builder_add_128(&context, uuid128); 956 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 957 } 958 959 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){ 960 // @format HX 961 uint8_t packet[26]; 962 packet[0] = GATT_EVENT_INCLUDED_SERVICE_QUERY_RESULT; 963 packet[1] = sizeof(packet) - 2u; 964 little_endian_store_16(packet, 2, gatt_client->con_handle); 965 /// 966 little_endian_store_16(packet, 4, include_handle); 967 // 968 little_endian_store_16(packet, 6, start_group_handle); 969 little_endian_store_16(packet, 8, end_group_handle); 970 reverse_128(uuid128, &packet[10]); 971 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 972 } 973 974 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, 975 uint16_t properties, const uint8_t * uuid128){ 976 // @format HY 977 uint8_t packet[28]; 978 hci_event_builder_context_t context; 979 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_CHARACTERISTIC_QUERY_RESULT, 0); 980 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 981 hci_event_builder_add_16(&context, start_handle); 982 hci_event_builder_add_16(&context, value_handle); 983 hci_event_builder_add_16(&context, end_handle); 984 hci_event_builder_add_16(&context, properties); 985 hci_event_builder_add_128(&context, uuid128); 986 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 987 } 988 989 static void emit_gatt_all_characteristic_descriptors_result_event( 990 gatt_client_t * gatt_client, uint16_t descriptor_handle, const uint8_t * uuid128){ 991 // @format HZ 992 uint8_t packet[22]; 993 packet[0] = GATT_EVENT_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT; 994 packet[1] = sizeof(packet) - 2u; 995 little_endian_store_16(packet, 2, gatt_client->con_handle); 996 /// 997 little_endian_store_16(packet, 4, descriptor_handle); 998 reverse_128(uuid128, &packet[6]); 999 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 1000 } 1001 1002 static void emit_gatt_mtu_exchanged_result_event(gatt_client_t * gatt_client, uint16_t new_mtu){ 1003 // @format H2 1004 uint8_t packet[6]; 1005 packet[0] = GATT_EVENT_MTU; 1006 packet[1] = sizeof(packet) - 2u; 1007 little_endian_store_16(packet, 2, gatt_client->con_handle); 1008 little_endian_store_16(packet, 4, new_mtu); 1009 att_dispatch_client_mtu_exchanged(gatt_client->con_handle, new_mtu); 1010 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 1011 } 1012 1013 // helper 1014 static void gatt_client_handle_transaction_complete(gatt_client_t *gatt_client, uint8_t att_status) { 1015 gatt_client->state = P_READY; 1016 gatt_client_timeout_stop(gatt_client); 1017 emit_gatt_complete_event(gatt_client, att_status); 1018 gatt_client_notify_can_send_query(gatt_client); 1019 } 1020 1021 // @return packet pointer 1022 // @note assume that value is part of an l2cap buffer - overwrite HCI + L2CAP packet headers 1023 #define CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 8 1024 static uint8_t * 1025 setup_characteristic_value_packet(const gatt_client_t *gatt_client, uint8_t type, uint16_t attribute_handle, 1026 uint8_t *value, uint16_t length) { 1027 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 1028 // copy value into test packet for testing 1029 static uint8_t packet[1000]; 1030 memcpy(&packet[CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE], value, length); 1031 #else 1032 // before the value inside the ATT PDU 1033 uint8_t * packet = value - CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE; 1034 #endif 1035 packet[0] = type; 1036 packet[1] = CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 2 + length; 1037 little_endian_store_16(packet, 2, gatt_client->con_handle); 1038 little_endian_store_16(packet, 4, attribute_handle); 1039 little_endian_store_16(packet, 6, length); 1040 return packet; 1041 } 1042 1043 // @return packet pointer 1044 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1045 #define LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 10 1046 1047 // L2CAP Header (4) + ACL Header (4) => 8 bytes 1048 #if !defined(HCI_INCOMING_PRE_BUFFER_SIZE) || ((HCI_INCOMING_PRE_BUFFER_SIZE < LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 8)) 1049 #error "Long Characteristic reads requires HCI_INCOMING_PRE_BUFFER_SIZE >= 2" 1050 #endif 1051 1052 static uint8_t * 1053 setup_long_characteristic_value_packet(const gatt_client_t *gatt_client, uint8_t type, uint16_t attribute_handle, 1054 uint16_t offset, uint8_t *value, uint16_t length) { 1055 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 1056 // avoid using pre ATT headers. 1057 // copy value into test packet for testing 1058 static uint8_t packet[1000]; 1059 memcpy(&packet[LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE], value, length); 1060 #else 1061 // before the value inside the ATT PDU 1062 uint8_t * packet = value - LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE; 1063 #endif 1064 packet[0] = type; 1065 packet[1] = LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 2 + length; 1066 little_endian_store_16(packet, 2, gatt_client->con_handle); 1067 little_endian_store_16(packet, 4, attribute_handle); 1068 little_endian_store_16(packet, 6, offset); 1069 little_endian_store_16(packet, 8, length); 1070 return packet; 1071 } 1072 1073 #if (LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE > CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE) 1074 #define REPORT_PREBUFFER_HEADER LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 1075 #else 1076 #define REPORT_PREBUFFER_HEADER CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 1077 #endif 1078 1079 /// 1080 static void report_gatt_services(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 1081 if (size < 2) return; 1082 uint8_t attr_length = packet[1]; 1083 uint8_t uuid_length = attr_length - 4u; 1084 1085 int i; 1086 for (i = 2; (i+attr_length) <= size; i += attr_length){ 1087 uint16_t start_group_handle = little_endian_read_16(packet,i); 1088 uint16_t end_group_handle = little_endian_read_16(packet,i+2); 1089 uint8_t uuid128[16]; 1090 uint16_t uuid16 = 0; 1091 1092 if (uuid_length == 2u){ 1093 uuid16 = little_endian_read_16(packet, i+4); 1094 uuid_add_bluetooth_prefix((uint8_t*) &uuid128, uuid16); 1095 } else if (uuid_length == 16u) { 1096 reverse_128(&packet[i+4], uuid128); 1097 } else { 1098 return; 1099 } 1100 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, uuid128); 1101 } 1102 } 1103 1104 static void report_gatt_characteristic_start_found(gatt_client_t * gatt_client, uint16_t start_handle, uint8_t properties, uint16_t value_handle, uint8_t * uuid, uint16_t uuid_length){ 1105 uint8_t uuid128[16]; 1106 uint16_t uuid16 = 0; 1107 if (uuid_length == 2u){ 1108 uuid16 = little_endian_read_16(uuid, 0); 1109 uuid_add_bluetooth_prefix((uint8_t*) uuid128, uuid16); 1110 } else if (uuid_length == 16u){ 1111 reverse_128(uuid, uuid128); 1112 } else { 1113 return; 1114 } 1115 1116 if (gatt_client->filter_with_uuid && (memcmp(gatt_client->uuid128, uuid128, 16) != 0)) return; 1117 1118 gatt_client->characteristic_properties = properties; 1119 gatt_client->characteristic_start_handle = start_handle; 1120 gatt_client->attribute_handle = value_handle; 1121 1122 if (gatt_client->filter_with_uuid) return; 1123 1124 gatt_client->uuid16 = uuid16; 1125 (void)memcpy(gatt_client->uuid128, uuid128, 16); 1126 } 1127 1128 static void report_gatt_characteristic_end_found(gatt_client_t * gatt_client, uint16_t end_handle){ 1129 // TODO: stop searching if filter and uuid found 1130 1131 if (!gatt_client->characteristic_start_handle) return; 1132 1133 emit_gatt_characteristic_query_result_event(gatt_client, gatt_client->characteristic_start_handle, gatt_client->attribute_handle, 1134 end_handle, gatt_client->characteristic_properties, gatt_client->uuid128); 1135 1136 gatt_client->characteristic_start_handle = 0; 1137 } 1138 1139 1140 static void report_gatt_characteristics(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 1141 if (size < 2u) return; 1142 uint8_t attr_length = packet[1]; 1143 if ((attr_length != 7u) && (attr_length != 21u)) return; 1144 uint8_t uuid_length = attr_length - 5u; 1145 int i; 1146 for (i = 2u; (i + attr_length) <= size; i += attr_length){ 1147 uint16_t start_handle = little_endian_read_16(packet, i); 1148 uint8_t properties = packet[i+2]; 1149 uint16_t value_handle = little_endian_read_16(packet, i+3); 1150 report_gatt_characteristic_end_found(gatt_client, start_handle - 1u); 1151 report_gatt_characteristic_start_found(gatt_client, start_handle, properties, value_handle, &packet[i + 5], 1152 uuid_length); 1153 } 1154 } 1155 1156 static void report_gatt_included_service_uuid16(gatt_client_t * gatt_client, uint16_t include_handle, uint16_t uuid16){ 1157 uint8_t normalized_uuid128[16]; 1158 uuid_add_bluetooth_prefix(normalized_uuid128, uuid16); 1159 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 1160 gatt_client->query_end_handle, normalized_uuid128); 1161 } 1162 1163 static void report_gatt_included_service_uuid128(gatt_client_t * gatt_client, uint16_t include_handle, const uint8_t * uuid128){ 1164 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 1165 gatt_client->query_end_handle, uuid128); 1166 } 1167 1168 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1169 static void report_gatt_notification(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { 1170 if (!gatt_client_accept_server_message(gatt_client)) return; 1171 uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_NOTIFICATION, value_handle, 1172 value, length); 1173 emit_event_to_registered_listeners(gatt_client->con_handle, value_handle, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 1174 } 1175 1176 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1177 static void report_gatt_indication(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { 1178 if (!gatt_client_accept_server_message(gatt_client)) return; 1179 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 1180 // Directly Handle GATT Service Changed and Database Hash indications 1181 if (value_handle == gatt_client->gatt_service_database_hash_value_handle){ 1182 gatt_client_service_emit_database_hash(gatt_client, value, length); 1183 } 1184 if (value_handle == gatt_client->gatt_service_changed_value_handle){ 1185 gatt_client_service_emit_service_changed(gatt_client, value, length); 1186 } 1187 #endif 1188 uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_INDICATION, value_handle, 1189 value, length); 1190 emit_event_to_registered_listeners(gatt_client->con_handle, value_handle, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 1191 } 1192 1193 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1194 static void report_gatt_characteristic_value(gatt_client_t * gatt_client, uint16_t attribute_handle, uint8_t * value, uint16_t length){ 1195 uint8_t * packet = setup_characteristic_value_packet( 1196 gatt_client, GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT, attribute_handle, value, length); 1197 emit_event_new(gatt_client->callback, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 1198 } 1199 1200 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1201 static void report_gatt_long_characteristic_value_blob(gatt_client_t * gatt_client, uint16_t attribute_handle, uint8_t * blob, uint16_t blob_length, int value_offset){ 1202 uint8_t * packet = setup_long_characteristic_value_packet(gatt_client, 1203 GATT_EVENT_LONG_CHARACTERISTIC_VALUE_QUERY_RESULT, 1204 attribute_handle, value_offset, 1205 blob, blob_length); 1206 emit_event_new(gatt_client->callback, packet, blob_length + LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE); 1207 } 1208 1209 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){ 1210 UNUSED(value_offset); 1211 uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, 1212 descriptor_handle, value, 1213 value_length); 1214 emit_event_new(gatt_client->callback, packet, value_length + 8u); 1215 } 1216 1217 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){ 1218 uint8_t * packet = setup_long_characteristic_value_packet(gatt_client, 1219 GATT_EVENT_LONG_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, 1220 descriptor_handle, value_offset, 1221 blob, blob_length); 1222 emit_event_new(gatt_client->callback, packet, blob_length + LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE); 1223 } 1224 1225 static void report_gatt_all_characteristic_descriptors(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size, uint16_t pair_size){ 1226 int i; 1227 for (i = 0u; (i + pair_size) <= size; i += pair_size){ 1228 uint16_t descriptor_handle = little_endian_read_16(packet,i); 1229 uint8_t uuid128[16]; 1230 uint16_t uuid16 = 0; 1231 if (pair_size == 4u){ 1232 uuid16 = little_endian_read_16(packet,i+2); 1233 uuid_add_bluetooth_prefix(uuid128, uuid16); 1234 } else { 1235 reverse_128(&packet[i+2], uuid128); 1236 } 1237 emit_gatt_all_characteristic_descriptors_result_event(gatt_client, descriptor_handle, uuid128); 1238 } 1239 1240 } 1241 1242 static bool is_query_done(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1243 return last_result_handle >= gatt_client->end_group_handle; 1244 } 1245 1246 static void trigger_next_query(gatt_client_t * gatt_client, uint16_t last_result_handle, gatt_client_state_t next_query_state){ 1247 if (is_query_done(gatt_client, last_result_handle)){ 1248 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1249 return; 1250 } 1251 // next 1252 gatt_client->start_group_handle = last_result_handle + 1u; 1253 gatt_client->state = next_query_state; 1254 } 1255 1256 static void trigger_next_included_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1257 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_INCLUDED_SERVICE_QUERY); 1258 } 1259 1260 static void trigger_next_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1261 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_QUERY); 1262 } 1263 1264 static void trigger_next_service_by_uuid_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1265 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_WITH_UUID_QUERY); 1266 } 1267 1268 static void trigger_next_characteristic_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1269 if (is_query_done(gatt_client, last_result_handle)){ 1270 // report last characteristic 1271 report_gatt_characteristic_end_found(gatt_client, gatt_client->end_group_handle); 1272 } 1273 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY); 1274 } 1275 1276 static void trigger_next_characteristic_descriptor_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1277 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY); 1278 } 1279 1280 static void trigger_next_read_by_type_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1281 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_READ_BY_TYPE_REQUEST); 1282 } 1283 1284 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){ 1285 gatt_client->attribute_offset += write_blob_length(gatt_client); 1286 uint16_t next_blob_length = write_blob_length(gatt_client); 1287 1288 if (next_blob_length == 0u){ 1289 gatt_client->state = done_state; 1290 return; 1291 } 1292 gatt_client->state = next_query_state; 1293 } 1294 1295 static void trigger_next_blob_query(gatt_client_t * gatt_client, gatt_client_state_t next_query_state, uint16_t received_blob_length){ 1296 1297 uint16_t max_blob_length = gatt_client->mtu - 1u; 1298 if (received_blob_length < max_blob_length){ 1299 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1300 return; 1301 } 1302 1303 gatt_client->attribute_offset += received_blob_length; 1304 gatt_client->state = next_query_state; 1305 } 1306 1307 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){ 1308 notification->callback = callback; 1309 notification->con_handle = con_handle; 1310 if (characteristic == NULL){ 1311 notification->attribute_handle = GATT_CLIENT_ANY_VALUE_HANDLE; 1312 } else { 1313 notification->attribute_handle = characteristic->value_handle; 1314 } 1315 btstack_linked_list_add(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 1316 } 1317 1318 void gatt_client_stop_listening_for_characteristic_value_updates(gatt_client_notification_t * notification){ 1319 btstack_linked_list_remove(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 1320 } 1321 1322 static bool is_value_valid(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size){ 1323 uint16_t attribute_handle = little_endian_read_16(packet, 1); 1324 uint16_t value_offset = little_endian_read_16(packet, 3); 1325 1326 if (gatt_client->attribute_handle != attribute_handle) return false; 1327 if (gatt_client->attribute_offset != value_offset) return false; 1328 return memcmp(&gatt_client->attribute_value[gatt_client->attribute_offset], &packet[5], size - 5u) == 0u; 1329 } 1330 1331 #ifdef ENABLE_LE_SIGNED_WRITE 1332 static void gatt_client_run_for_client_start_signed_write(gatt_client_t *gatt_client) { 1333 sm_key_t csrk; 1334 le_device_db_local_csrk_get(gatt_client->le_device_index, csrk); 1335 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 1336 gatt_client->state = P_W4_CMAC_RESULT; 1337 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); 1338 } 1339 #endif 1340 1341 // returns true if packet was sent 1342 static bool gatt_client_run_for_gatt_client(gatt_client_t * gatt_client){ 1343 1344 // wait until re-encryption is complete 1345 if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return false; 1346 1347 // wait until re-encryption is complete 1348 if (gatt_client->reencryption_active) return false; 1349 1350 // wait until pairing complete (either reactive authentication or due to required security level) 1351 if (gatt_client->wait_for_authentication_complete) return false; 1352 1353 bool client_request_pending = gatt_client->state != P_READY; 1354 1355 // verify security level for Mandatory Authentication over LE 1356 bool check_security; 1357 switch (gatt_client->bearer_type){ 1358 case ATT_BEARER_UNENHANCED_LE: 1359 check_security = true; 1360 break; 1361 default: 1362 check_security = false; 1363 break; 1364 } 1365 if (client_request_pending && (gatt_client_required_security_level > gatt_client->security_level) && check_security){ 1366 log_info("Trigger pairing, current security level %u, required %u\n", gatt_client->security_level, gatt_client_required_security_level); 1367 gatt_client->wait_for_authentication_complete = true; 1368 // set att error code for pairing failure based on required level 1369 switch (gatt_client_required_security_level){ 1370 case LEVEL_4: 1371 case LEVEL_3: 1372 gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_AUTHENTICATION; 1373 break; 1374 default: 1375 gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_ENCRYPTION; 1376 break; 1377 } 1378 sm_request_pairing(gatt_client->con_handle); 1379 // sm probably just sent a pdu 1380 return true; 1381 } 1382 1383 switch (gatt_client->mtu_state) { 1384 case SEND_MTU_EXCHANGE: 1385 gatt_client->mtu_state = SENT_MTU_EXCHANGE; 1386 att_exchange_mtu_request(gatt_client); 1387 return true; 1388 case SENT_MTU_EXCHANGE: 1389 return false; 1390 default: 1391 break; 1392 } 1393 1394 if (gatt_client->send_confirmation){ 1395 gatt_client->send_confirmation = false; 1396 att_confirmation(gatt_client); 1397 return true; 1398 } 1399 1400 // check MTU for writes 1401 switch (gatt_client->state){ 1402 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 1403 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 1404 if (gatt_client->attribute_length <= (gatt_client->mtu - 3u)) break; 1405 log_error("gatt_client_run: value len %u > MTU %u - 3\n", gatt_client->attribute_length,gatt_client->mtu); 1406 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH); 1407 return false; 1408 default: 1409 break; 1410 } 1411 1412 bool packet_sent = true; 1413 bool done = true; 1414 switch (gatt_client->state){ 1415 case P_W2_SEND_SERVICE_QUERY: 1416 gatt_client->state = P_W4_SERVICE_QUERY_RESULT; 1417 send_gatt_services_request(gatt_client); 1418 break; 1419 1420 case P_W2_SEND_SERVICE_WITH_UUID_QUERY: 1421 gatt_client->state = P_W4_SERVICE_WITH_UUID_RESULT; 1422 send_gatt_services_by_uuid_request(gatt_client); 1423 break; 1424 1425 case P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY: 1426 gatt_client->state = P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT; 1427 send_gatt_characteristic_request(gatt_client); 1428 break; 1429 1430 case P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY: 1431 gatt_client->state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 1432 send_gatt_characteristic_request(gatt_client); 1433 break; 1434 1435 case P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY: 1436 gatt_client->state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 1437 send_gatt_characteristic_descriptor_request(gatt_client); 1438 break; 1439 1440 case P_W2_SEND_INCLUDED_SERVICE_QUERY: 1441 gatt_client->state = P_W4_INCLUDED_SERVICE_QUERY_RESULT; 1442 send_gatt_included_service_request(gatt_client); 1443 break; 1444 1445 case P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY: 1446 gatt_client->state = P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT; 1447 send_gatt_included_service_uuid_request(gatt_client); 1448 break; 1449 1450 case P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY: 1451 gatt_client->state = P_W4_READ_CHARACTERISTIC_VALUE_RESULT; 1452 send_gatt_read_characteristic_value_request(gatt_client); 1453 break; 1454 1455 case P_W2_SEND_READ_BLOB_QUERY: 1456 gatt_client->state = P_W4_READ_BLOB_RESULT; 1457 send_gatt_read_blob_request(gatt_client); 1458 break; 1459 1460 case P_W2_SEND_READ_BY_TYPE_REQUEST: 1461 gatt_client->state = P_W4_READ_BY_TYPE_RESPONSE; 1462 send_gatt_read_by_type_request(gatt_client); 1463 break; 1464 1465 case P_W2_SEND_READ_MULTIPLE_REQUEST: 1466 gatt_client->state = P_W4_READ_MULTIPLE_RESPONSE; 1467 send_gatt_read_multiple_request(gatt_client); 1468 break; 1469 1470 #ifdef ENABLE_GATT_OVER_EATT 1471 case P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST: 1472 gatt_client->state = P_W4_READ_MULTIPLE_VARIABLE_RESPONSE; 1473 send_gatt_read_multiple_variable_request(gatt_client); 1474 break; 1475 #endif 1476 1477 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 1478 gatt_client->state = P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT; 1479 send_gatt_write_attribute_value_request(gatt_client); 1480 break; 1481 1482 case P_W2_PREPARE_WRITE: 1483 gatt_client->state = P_W4_PREPARE_WRITE_RESULT; 1484 send_gatt_prepare_write_request(gatt_client); 1485 break; 1486 1487 case P_W2_PREPARE_WRITE_SINGLE: 1488 gatt_client->state = P_W4_PREPARE_WRITE_SINGLE_RESULT; 1489 send_gatt_prepare_write_request(gatt_client); 1490 break; 1491 1492 case P_W2_PREPARE_RELIABLE_WRITE: 1493 gatt_client->state = P_W4_PREPARE_RELIABLE_WRITE_RESULT; 1494 send_gatt_prepare_write_request(gatt_client); 1495 break; 1496 1497 case P_W2_EXECUTE_PREPARED_WRITE: 1498 gatt_client->state = P_W4_EXECUTE_PREPARED_WRITE_RESULT; 1499 send_gatt_execute_write_request(gatt_client); 1500 break; 1501 1502 case P_W2_CANCEL_PREPARED_WRITE: 1503 gatt_client->state = P_W4_CANCEL_PREPARED_WRITE_RESULT; 1504 send_gatt_cancel_prepared_write_request(gatt_client); 1505 break; 1506 1507 case P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH: 1508 gatt_client->state = P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT; 1509 send_gatt_cancel_prepared_write_request(gatt_client); 1510 break; 1511 1512 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1513 case P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 1514 // use Find Information 1515 gatt_client->gatt_client_state = P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1516 send_gatt_characteristic_descriptor_request(gatt_client); 1517 #else 1518 case P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 1519 // Use Read By Type 1520 gatt_client->state = P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1521 send_gatt_read_client_characteristic_configuration_request(gatt_client); 1522 #endif 1523 break; 1524 1525 case P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY: 1526 gatt_client->state = P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT; 1527 send_gatt_read_characteristic_descriptor_request(gatt_client); 1528 break; 1529 1530 case P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY: 1531 gatt_client->state = P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT; 1532 send_gatt_read_blob_request(gatt_client); 1533 break; 1534 1535 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 1536 gatt_client->state = P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1537 send_gatt_write_attribute_value_request(gatt_client); 1538 break; 1539 1540 case P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION: 1541 gatt_client->state = P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT; 1542 send_gatt_write_client_characteristic_configuration_request(gatt_client); 1543 break; 1544 1545 case P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR: 1546 gatt_client->state = P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1547 send_gatt_prepare_write_request(gatt_client); 1548 break; 1549 1550 case P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR: 1551 gatt_client->state = P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1552 send_gatt_execute_write_request(gatt_client); 1553 break; 1554 1555 #ifdef ENABLE_LE_SIGNED_WRITE 1556 case P_W4_IDENTITY_RESOLVING: 1557 log_info("P_W4_IDENTITY_RESOLVING - state %x", sm_identity_resolving_state(gatt_client->con_handle)); 1558 switch (sm_identity_resolving_state(gatt_client->con_handle)){ 1559 case IRK_LOOKUP_SUCCEEDED: 1560 gatt_client->le_device_index = sm_le_device_index(gatt_client->con_handle); 1561 gatt_client->state = P_W4_CMAC_READY; 1562 if (sm_cmac_ready()){ 1563 gatt_client_run_for_client_start_signed_write(gatt_client); 1564 } 1565 break; 1566 case IRK_LOOKUP_FAILED: 1567 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1568 break; 1569 default: 1570 break; 1571 } 1572 packet_sent = false; 1573 break; 1574 1575 case P_W4_CMAC_READY: 1576 if (sm_cmac_ready()){ 1577 gatt_client_run_for_client_start_signed_write(gatt_client); 1578 } 1579 packet_sent = false; 1580 break; 1581 1582 case P_W2_SEND_SIGNED_WRITE: { 1583 gatt_client->state = P_W4_SEND_SIGNED_WRITE_DONE; 1584 // bump local signing counter 1585 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 1586 le_device_db_local_counter_set(gatt_client->le_device_index, sign_counter + 1); 1587 // send signed write command 1588 send_gatt_signed_write_request(gatt_client, sign_counter); 1589 // finally, notifiy client that write is complete 1590 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1591 break; 1592 } 1593 #endif 1594 default: 1595 done = false; 1596 break; 1597 } 1598 1599 if (done){ 1600 return packet_sent; 1601 } 1602 1603 // write without response callback 1604 btstack_context_callback_registration_t * callback = 1605 (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->write_without_response_requests); 1606 if (callback != NULL){ 1607 (*callback->callback)(callback->context); 1608 return true; 1609 } 1610 1611 // requested can send now old 1612 if (gatt_client->write_without_response_callback != NULL){ 1613 btstack_packet_handler_t packet_handler = gatt_client->write_without_response_callback; 1614 gatt_client->write_without_response_callback = NULL; 1615 uint8_t event[4]; 1616 event[0] = GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE; 1617 event[1] = sizeof(event) - 2u; 1618 little_endian_store_16(event, 2, gatt_client->con_handle); 1619 packet_handler(HCI_EVENT_PACKET, gatt_client->con_handle, event, sizeof(event)); 1620 return true; // to trigger requeueing (even if higher layer didn't sent) 1621 } 1622 1623 return false; 1624 } 1625 1626 static void gatt_client_run(void){ 1627 btstack_linked_item_t *it; 1628 bool packet_sent; 1629 #ifdef ENABLE_GATT_OVER_EATT 1630 btstack_linked_list_iterator_t it_eatt; 1631 #endif 1632 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 1633 gatt_client_t * gatt_client = (gatt_client_t *) it; 1634 switch (gatt_client->bearer_type){ 1635 case ATT_BEARER_UNENHANCED_LE: 1636 #ifdef ENABLE_GATT_OVER_EATT 1637 btstack_linked_list_iterator_init(&it_eatt, &gatt_client->eatt_clients); 1638 while (btstack_linked_list_iterator_has_next(&it_eatt)) { 1639 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it_eatt); 1640 if (eatt_client->state != P_READY){ 1641 if (att_dispatch_client_can_send_now(gatt_client->con_handle)){ 1642 gatt_client_run_for_gatt_client(eatt_client); 1643 } 1644 } 1645 } 1646 #endif 1647 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) { 1648 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1649 return; 1650 } 1651 packet_sent = gatt_client_run_for_gatt_client(gatt_client); 1652 if (packet_sent){ 1653 // request new permission 1654 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1655 // requeue client for fairness and exit 1656 // note: iterator has become invalid 1657 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1658 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1659 return; 1660 } 1661 break; 1662 #ifdef ENABLE_GATT_OVER_CLASSIC 1663 case ATT_BEARER_UNENHANCED_CLASSIC: 1664 if (gatt_client->con_handle == HCI_CON_HANDLE_INVALID) { 1665 continue; 1666 } 1667 1668 // handle GATT over BR/EDR 1669 if (att_dispatch_client_can_send_now(gatt_client->con_handle) == false) { 1670 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1671 return; 1672 } 1673 packet_sent = gatt_client_run_for_gatt_client(gatt_client); 1674 if (packet_sent){ 1675 // request new permission 1676 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1677 // requeue client for fairness and exit 1678 // note: iterator has become invalid 1679 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1680 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1681 return; 1682 } 1683 break; 1684 #endif 1685 default: 1686 btstack_unreachable(); 1687 break; 1688 } 1689 1690 1691 } 1692 } 1693 1694 // emit complete event, used to avoid emitting event from API call 1695 static void gatt_client_emit_events(void * context){ 1696 UNUSED(context); 1697 btstack_linked_item_t *it; 1698 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next) { 1699 gatt_client_t *gatt_client = (gatt_client_t *) it; 1700 if (gatt_client->state == P_W2_EMIT_QUERY_COMPLETE_EVENT){ 1701 gatt_client->state = P_READY; 1702 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1703 } 1704 } 1705 } 1706 1707 static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code) { 1708 if (is_ready(gatt_client)) return; 1709 gatt_client_handle_transaction_complete(gatt_client, att_error_code); 1710 } 1711 1712 static void gatt_client_handle_reencryption_complete(const uint8_t * packet){ 1713 hci_con_handle_t con_handle = sm_event_reencryption_complete_get_handle(packet); 1714 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 1715 if (gatt_client == NULL) return; 1716 1717 // update security level 1718 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 1719 1720 gatt_client->reencryption_result = sm_event_reencryption_complete_get_status(packet); 1721 gatt_client->reencryption_active = false; 1722 gatt_client->wait_for_authentication_complete = false; 1723 1724 if (gatt_client->state == P_READY) return; 1725 1726 switch (sm_event_reencryption_complete_get_status(packet)){ 1727 case ERROR_CODE_SUCCESS: 1728 log_info("re-encryption success, retry operation"); 1729 break; 1730 case ERROR_CODE_AUTHENTICATION_FAILURE: 1731 case ERROR_CODE_PIN_OR_KEY_MISSING: 1732 #if defined(ENABLE_GATT_CLIENT_PAIRING) && !defined(ENABLE_LE_PROACTIVE_AUTHENTICATION) 1733 if (gatt_client_required_security_level == LEVEL_0) { 1734 // re-encryption failed for reactive authentication with pairing and we have a pending client request 1735 // => try to resolve it by deleting bonding information if we started pairing before 1736 // delete bonding information 1737 int le_device_db_index = sm_le_device_index(gatt_client->con_handle); 1738 btstack_assert(le_device_db_index >= 0); 1739 log_info("reactive auth with pairing: delete bonding and start pairing"); 1740 #ifdef ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION 1741 hci_remove_le_device_db_entry_from_resolving_list((uint16_t) le_device_db_index); 1742 #endif 1743 le_device_db_remove(le_device_db_index); 1744 // trigger pairing again 1745 sm_request_pairing(gatt_client->con_handle); 1746 break; 1747 } 1748 #endif 1749 // report bonding information missing 1750 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1751 break; 1752 default: 1753 // report bonding information missing 1754 gatt_client_handle_transaction_complete(gatt_client, gatt_client->pending_error_code); 1755 break; 1756 } 1757 } 1758 1759 static void gatt_client_handle_disconnection_complete(const uint8_t * packet){ 1760 log_info("GATT Client: HCI_EVENT_DISCONNECTION_COMPLETE"); 1761 hci_con_handle_t con_handle = little_endian_read_16(packet,3); 1762 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 1763 if (gatt_client == NULL) return; 1764 1765 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 1766 gatt_client_timeout_stop(gatt_client); 1767 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1768 btstack_memory_gatt_client_free(gatt_client); 1769 } 1770 1771 static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1772 UNUSED(channel); // ok: handling own l2cap events 1773 UNUSED(size); // ok: there is no channel 1774 1775 if (packet_type != HCI_EVENT_PACKET) return; 1776 1777 hci_con_handle_t con_handle; 1778 gatt_client_t * gatt_client; 1779 switch (hci_event_packet_get_type(packet)) { 1780 case HCI_EVENT_DISCONNECTION_COMPLETE: 1781 gatt_client_handle_disconnection_complete(packet); 1782 break; 1783 1784 // Pairing complete (with/without bonding=storing of pairing information) 1785 case SM_EVENT_PAIRING_COMPLETE: 1786 con_handle = sm_event_pairing_complete_get_handle(packet); 1787 gatt_client = gatt_client_get_context_for_handle(con_handle); 1788 if (gatt_client == NULL) break; 1789 1790 // update security level 1791 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 1792 1793 if (gatt_client->wait_for_authentication_complete){ 1794 gatt_client->wait_for_authentication_complete = false; 1795 if (sm_event_pairing_complete_get_status(packet) != ERROR_CODE_SUCCESS){ 1796 log_info("pairing failed, report previous error 0x%x", gatt_client->pending_error_code); 1797 gatt_client_report_error_if_pending(gatt_client, gatt_client->pending_error_code); 1798 } else { 1799 log_info("pairing success, retry operation"); 1800 } 1801 } 1802 break; 1803 1804 #ifdef ENABLE_LE_SIGNED_WRITE 1805 // Identity Resolving completed (no code, gatt_client_run will continue) 1806 case SM_EVENT_IDENTITY_RESOLVING_SUCCEEDED: 1807 case SM_EVENT_IDENTITY_RESOLVING_FAILED: 1808 break; 1809 #endif 1810 1811 // re-encryption started 1812 case SM_EVENT_REENCRYPTION_STARTED: 1813 con_handle = sm_event_reencryption_complete_get_handle(packet); 1814 gatt_client = gatt_client_get_context_for_handle(con_handle); 1815 if (gatt_client == NULL) break; 1816 1817 gatt_client->reencryption_active = true; 1818 gatt_client->reencryption_result = ERROR_CODE_SUCCESS; 1819 break; 1820 1821 // re-encryption complete 1822 case SM_EVENT_REENCRYPTION_COMPLETE: 1823 gatt_client_handle_reencryption_complete(packet); 1824 break; 1825 default: 1826 break; 1827 } 1828 1829 gatt_client_run(); 1830 } 1831 1832 static void gatt_client_handle_att_read_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { 1833 switch (gatt_client->state) { 1834 case P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT: 1835 if (size >= 17) { 1836 uint8_t uuid128[16]; 1837 reverse_128(&packet[1], uuid128); 1838 report_gatt_included_service_uuid128(gatt_client, gatt_client->start_group_handle, uuid128); 1839 } 1840 trigger_next_included_service_query(gatt_client, gatt_client->start_group_handle); 1841 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1842 break; 1843 1844 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 1845 report_gatt_characteristic_value(gatt_client, gatt_client->attribute_handle, &packet[1], size - 1u); 1846 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1847 break; 1848 1849 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: 1850 report_gatt_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], 1851 size - 1u, 0u); 1852 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1853 break; 1854 1855 // Use ATT_READ_REQUEST for first blob of Read Long Characteristic 1856 case P_W4_READ_BLOB_RESULT: 1857 report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], 1858 size - 1u, gatt_client->attribute_offset); 1859 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, size - 1u); 1860 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1861 break; 1862 1863 // Use ATT_READ_REQUEST for first blob of Read Long Characteristic Descriptor 1864 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 1865 report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], 1866 size - 1u, gatt_client->attribute_offset); 1867 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, 1868 size - 1u); 1869 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1870 break; 1871 1872 default: 1873 break; 1874 } 1875 } 1876 1877 static void gatt_client_handle_att_read_by_type_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { 1878 switch (gatt_client->state) { 1879 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 1880 report_gatt_characteristics(gatt_client, packet, size); 1881 trigger_next_characteristic_query(gatt_client, 1882 get_last_result_handle_from_characteristics_list(packet, size)); 1883 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1884 break; 1885 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 1886 report_gatt_characteristics(gatt_client, packet, size); 1887 trigger_next_characteristic_query(gatt_client, 1888 get_last_result_handle_from_characteristics_list(packet, size)); 1889 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1890 break; 1891 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: { 1892 if (size < 2u) break; 1893 uint16_t uuid16 = 0; 1894 uint16_t pair_size = packet[1]; 1895 1896 if (pair_size == 6u) { 1897 if (size < 8u) break; 1898 // UUIDs not available, query first included service 1899 gatt_client->start_group_handle = little_endian_read_16(packet, 2); // ready for next query 1900 gatt_client->query_start_handle = little_endian_read_16(packet, 4); 1901 gatt_client->query_end_handle = little_endian_read_16(packet, 6); 1902 gatt_client->state = P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY; 1903 break; 1904 } 1905 1906 if (pair_size != 8u) break; 1907 1908 // UUIDs included, report all of them 1909 uint16_t offset; 1910 for (offset = 2u; (offset + 8u) <= size; offset += pair_size) { 1911 uint16_t include_handle = little_endian_read_16(packet, offset); 1912 gatt_client->query_start_handle = little_endian_read_16(packet, offset + 2u); 1913 gatt_client->query_end_handle = little_endian_read_16(packet, offset + 4u); 1914 uuid16 = little_endian_read_16(packet, offset + 6u); 1915 report_gatt_included_service_uuid16(gatt_client, include_handle, uuid16); 1916 } 1917 1918 trigger_next_included_service_query(gatt_client, 1919 get_last_result_handle_from_included_services_list(packet, 1920 size)); 1921 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1922 break; 1923 } 1924 #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1925 case P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT: 1926 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, 2); 1927 gatt_client->state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 1928 break; 1929 #endif 1930 case P_W4_READ_BY_TYPE_RESPONSE: { 1931 uint16_t pair_size = packet[1]; 1932 // set last result handle to last valid handle, only used if pair_size invalid 1933 uint16_t last_result_handle = 0xffff; 1934 if (pair_size > 2) { 1935 uint16_t offset; 1936 for (offset = 2; offset < size; offset += pair_size) { 1937 uint16_t value_handle = little_endian_read_16(packet, offset); 1938 report_gatt_characteristic_value(gatt_client, value_handle, &packet[offset + 2u], 1939 pair_size - 2u); 1940 last_result_handle = value_handle; 1941 } 1942 } 1943 trigger_next_read_by_type_query(gatt_client, last_result_handle); 1944 break; 1945 } 1946 default: 1947 break; 1948 } 1949 } 1950 1951 static void gatt_client_handle_att_write_response(gatt_client_t *gatt_client) { 1952 switch (gatt_client->state) { 1953 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 1954 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1955 break; 1956 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 1957 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1958 break; 1959 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1960 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1961 break; 1962 default: 1963 break; 1964 } 1965 } 1966 1967 static void gatt_client_handle_att_response(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size) { 1968 uint8_t att_status; 1969 switch (packet[0]) { 1970 case ATT_EXCHANGE_MTU_RESPONSE: { 1971 if (size < 3u) break; 1972 bool update_gatt_server_att_mtu = false; 1973 uint16_t remote_rx_mtu = little_endian_read_16(packet, 1); 1974 uint16_t local_rx_mtu = l2cap_max_le_mtu(); 1975 switch (gatt_client->bearer_type){ 1976 case ATT_BEARER_UNENHANCED_LE: 1977 update_gatt_server_att_mtu = true; 1978 break; 1979 #ifdef ENABLE_GATT_OVER_CLASSIC 1980 case ATT_BEARER_UNENHANCED_CLASSIC: 1981 local_rx_mtu = gatt_client->mtu; 1982 break; 1983 #endif 1984 default: 1985 btstack_unreachable(); 1986 break; 1987 } 1988 1989 uint16_t mtu = (remote_rx_mtu < local_rx_mtu) ? remote_rx_mtu : local_rx_mtu; 1990 1991 // set gatt client mtu 1992 gatt_client->mtu = mtu; 1993 gatt_client->mtu_state = MTU_EXCHANGED; 1994 1995 if (update_gatt_server_att_mtu){ 1996 // set per connection mtu state - for fixed channel 1997 hci_connection_t *hci_connection = hci_connection_for_handle(gatt_client->con_handle); 1998 hci_connection->att_connection.mtu = gatt_client->mtu; 1999 hci_connection->att_connection.mtu_exchanged = true; 2000 } 2001 emit_gatt_mtu_exchanged_result_event(gatt_client, gatt_client->mtu); 2002 break; 2003 } 2004 case ATT_READ_BY_GROUP_TYPE_RESPONSE: 2005 switch (gatt_client->state) { 2006 case P_W4_SERVICE_QUERY_RESULT: 2007 report_gatt_services(gatt_client, packet, size); 2008 trigger_next_service_query(gatt_client, get_last_result_handle_from_service_list(packet, size)); 2009 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2010 break; 2011 default: 2012 break; 2013 } 2014 break; 2015 case ATT_HANDLE_VALUE_NOTIFICATION: 2016 if (size < 3u) return; 2017 report_gatt_notification(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); 2018 return; 2019 #ifdef ENABLE_GATT_OVER_EATT 2020 case ATT_MULTIPLE_HANDLE_VALUE_NTF: 2021 if (size >= 5u) { 2022 uint16_t offset = 1; 2023 while (true){ 2024 uint16_t value_handle = little_endian_read_16(packet, offset); 2025 offset += 2; 2026 uint16_t value_length = little_endian_read_16(packet, offset); 2027 offset += 2; 2028 if ((offset + value_length) > size) break; 2029 report_gatt_notification(gatt_client, value_handle, &packet[offset], value_length); 2030 offset += value_length; 2031 } 2032 } 2033 return; 2034 #endif 2035 case ATT_HANDLE_VALUE_INDICATION: 2036 if (size < 3u) break; 2037 report_gatt_indication(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); 2038 gatt_client->send_confirmation = true; 2039 break; 2040 case ATT_READ_BY_TYPE_RESPONSE: 2041 gatt_client_handle_att_read_by_type_response(gatt_client, packet, size); 2042 break; 2043 case ATT_READ_RESPONSE: 2044 gatt_client_handle_att_read_response(gatt_client, packet, size); 2045 break; 2046 case ATT_FIND_BY_TYPE_VALUE_RESPONSE: { 2047 uint8_t pair_size = 4; 2048 int i; 2049 uint16_t start_group_handle; 2050 uint16_t end_group_handle = 0xffff; // asserts GATT_EVENT_QUERY_COMPLETE is emitted if no results 2051 for (i = 1u; (i + pair_size) <= size; i += pair_size) { 2052 start_group_handle = little_endian_read_16(packet, i); 2053 end_group_handle = little_endian_read_16(packet, i + 2); 2054 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, 2055 gatt_client->uuid128); 2056 } 2057 trigger_next_service_by_uuid_query(gatt_client, end_group_handle); 2058 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2059 break; 2060 } 2061 case ATT_FIND_INFORMATION_REPLY: { 2062 if (size < 2u) break; 2063 2064 uint8_t pair_size = 4; 2065 if (packet[1u] == 2u) { 2066 pair_size = 18; 2067 } 2068 uint16_t offset = 2; 2069 2070 if (size < (pair_size + offset)) break; 2071 uint16_t last_descriptor_handle = little_endian_read_16(packet, size - pair_size); 2072 2073 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 2074 log_info("ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY, state %x", gatt_client->gatt_client_state); 2075 if (gatt_client->gatt_client_state == P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT){ 2076 // iterate over descriptors looking for CCC 2077 if (pair_size == 4){ 2078 while ((offset + 4) <= size){ 2079 uint16_t uuid16 = little_endian_read_16(packet, offset + 2); 2080 if (uuid16 == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION){ 2081 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, offset); 2082 gatt_client->gatt_client_state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 2083 log_info("CCC found %x", gatt_client->client_characteristic_configuration_handle); 2084 break; 2085 } 2086 offset += pair_size; 2087 } 2088 } 2089 if (is_query_done(gatt_client, last_descriptor_handle)){ 2090 2091 } else { 2092 // next 2093 gatt_client->start_group_handle = last_descriptor_handle + 1; 2094 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2095 } 2096 break; 2097 } 2098 #endif 2099 report_gatt_all_characteristic_descriptors(gatt_client, &packet[2], size - 2u, pair_size); 2100 trigger_next_characteristic_descriptor_query(gatt_client, last_descriptor_handle); 2101 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2102 break; 2103 } 2104 2105 case ATT_WRITE_RESPONSE: 2106 gatt_client_handle_att_write_response(gatt_client); 2107 break; 2108 2109 case ATT_READ_BLOB_RESPONSE: { 2110 uint16_t received_blob_length = size - 1u; 2111 switch (gatt_client->state) { 2112 case P_W4_READ_BLOB_RESULT: 2113 report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], 2114 received_blob_length, gatt_client->attribute_offset); 2115 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, received_blob_length); 2116 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2117 break; 2118 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 2119 report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, 2120 &packet[1], received_blob_length, 2121 gatt_client->attribute_offset); 2122 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, 2123 received_blob_length); 2124 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2125 break; 2126 default: 2127 break; 2128 } 2129 break; 2130 } 2131 case ATT_PREPARE_WRITE_RESPONSE: 2132 switch (gatt_client->state) { 2133 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 2134 if (is_value_valid(gatt_client, packet, size)) { 2135 att_status = ATT_ERROR_SUCCESS; 2136 } else { 2137 att_status = ATT_ERROR_DATA_MISMATCH; 2138 } 2139 gatt_client_handle_transaction_complete(gatt_client, att_status); 2140 break; 2141 2142 case P_W4_PREPARE_WRITE_RESULT: { 2143 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 2144 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE, P_W2_EXECUTE_PREPARED_WRITE); 2145 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2146 break; 2147 } 2148 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: { 2149 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 2150 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR, 2151 P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR); 2152 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2153 break; 2154 } 2155 case P_W4_PREPARE_RELIABLE_WRITE_RESULT: { 2156 if (is_value_valid(gatt_client, packet, size)) { 2157 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 2158 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_RELIABLE_WRITE, 2159 P_W2_EXECUTE_PREPARED_WRITE); 2160 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2161 break; 2162 } 2163 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 2164 break; 2165 } 2166 default: 2167 break; 2168 } 2169 break; 2170 2171 case ATT_EXECUTE_WRITE_RESPONSE: 2172 switch (gatt_client->state) { 2173 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 2174 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2175 break; 2176 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 2177 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2178 break; 2179 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 2180 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_DATA_MISMATCH); 2181 break; 2182 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2183 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2184 break; 2185 default: 2186 break; 2187 2188 } 2189 break; 2190 2191 case ATT_READ_MULTIPLE_RESPONSE: 2192 switch (gatt_client->state) { 2193 case P_W4_READ_MULTIPLE_RESPONSE: 2194 report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); 2195 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2196 break; 2197 default: 2198 break; 2199 } 2200 break; 2201 2202 #ifdef ENABLE_GATT_OVER_EATT 2203 case ATT_READ_MULTIPLE_VARIABLE_RSP: 2204 switch (gatt_client->state) { 2205 case P_W4_READ_MULTIPLE_VARIABLE_RESPONSE: 2206 report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); 2207 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2208 break; 2209 default: 2210 break; 2211 } 2212 break; 2213 #endif 2214 2215 case ATT_ERROR_RESPONSE: 2216 if (size < 5u) return; 2217 att_status = packet[4]; 2218 switch (att_status) { 2219 case ATT_ERROR_ATTRIBUTE_NOT_FOUND: { 2220 switch (gatt_client->state) { 2221 case P_W4_SERVICE_QUERY_RESULT: 2222 case P_W4_SERVICE_WITH_UUID_RESULT: 2223 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: 2224 case P_W4_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT: 2225 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2226 break; 2227 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 2228 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 2229 report_gatt_characteristic_end_found(gatt_client, gatt_client->end_group_handle); 2230 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2231 break; 2232 case P_W4_READ_BY_TYPE_RESPONSE: 2233 if (gatt_client->start_group_handle == gatt_client->query_start_handle) { 2234 att_status = ATT_ERROR_ATTRIBUTE_NOT_FOUND; 2235 } else { 2236 att_status = ATT_ERROR_SUCCESS; 2237 } 2238 gatt_client_handle_transaction_complete(gatt_client, att_status); 2239 break; 2240 default: 2241 gatt_client_report_error_if_pending(gatt_client, att_status); 2242 break; 2243 } 2244 break; 2245 } 2246 2247 #ifdef ENABLE_GATT_CLIENT_PAIRING 2248 2249 case ATT_ERROR_INSUFFICIENT_AUTHENTICATION: 2250 case ATT_ERROR_INSUFFICIENT_ENCRYPTION_KEY_SIZE: 2251 case ATT_ERROR_INSUFFICIENT_ENCRYPTION: { 2252 2253 // security too low 2254 if (gatt_client->security_counter > 0) { 2255 gatt_client_report_error_if_pending(gatt_client, att_status); 2256 break; 2257 } 2258 // start security 2259 gatt_client->security_counter++; 2260 2261 // setup action 2262 int retry = 1; 2263 switch (gatt_client->state){ 2264 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 2265 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY ; 2266 break; 2267 case P_W4_READ_BLOB_RESULT: 2268 gatt_client->state = P_W2_SEND_READ_BLOB_QUERY; 2269 break; 2270 case P_W4_READ_BY_TYPE_RESPONSE: 2271 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2272 break; 2273 case P_W4_READ_MULTIPLE_RESPONSE: 2274 gatt_client->state = P_W2_SEND_READ_MULTIPLE_REQUEST; 2275 break; 2276 case P_W4_READ_MULTIPLE_VARIABLE_RESPONSE: 2277 gatt_client->state = P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST; 2278 break; 2279 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 2280 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 2281 break; 2282 case P_W4_PREPARE_WRITE_RESULT: 2283 gatt_client->state = P_W2_PREPARE_WRITE; 2284 break; 2285 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 2286 gatt_client->state = P_W2_PREPARE_WRITE_SINGLE; 2287 break; 2288 case P_W4_PREPARE_RELIABLE_WRITE_RESULT: 2289 gatt_client->state = P_W2_PREPARE_RELIABLE_WRITE; 2290 break; 2291 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 2292 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE; 2293 break; 2294 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 2295 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE; 2296 break; 2297 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 2298 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 2299 break; 2300 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: 2301 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 2302 break; 2303 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 2304 gatt_client->state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 2305 break; 2306 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2307 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 2308 break; 2309 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 2310 gatt_client->state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 2311 break; 2312 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2313 gatt_client->state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 2314 break; 2315 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2316 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR; 2317 break; 2318 #ifdef ENABLE_LE_SIGNED_WRITE 2319 case P_W4_SEND_SIGNED_WRITE_DONE: 2320 gatt_client->state = P_W2_SEND_SIGNED_WRITE; 2321 break; 2322 #endif 2323 default: 2324 log_info("retry not supported for state %x", gatt_client->state); 2325 retry = 0; 2326 break; 2327 } 2328 2329 if (!retry) { 2330 gatt_client_report_error_if_pending(gatt_client, att_status); 2331 break; 2332 } 2333 2334 log_info("security error, start pairing"); 2335 2336 // start pairing for higher security level 2337 gatt_client->wait_for_authentication_complete = true; 2338 gatt_client->pending_error_code = att_status; 2339 sm_request_pairing(gatt_client->con_handle); 2340 break; 2341 } 2342 #endif 2343 2344 // nothing we can do about that 2345 case ATT_ERROR_INSUFFICIENT_AUTHORIZATION: 2346 default: 2347 gatt_client_report_error_if_pending(gatt_client, att_status); 2348 break; 2349 } 2350 break; 2351 2352 default: 2353 log_info("ATT Handler, unhandled response type 0x%02x", packet[0]); 2354 break; 2355 } 2356 } 2357 2358 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size) { 2359 gatt_client_t *gatt_client; 2360 #ifdef ENABLE_GATT_OVER_CLASSIC 2361 uint8_t status; 2362 hci_connection_t * hci_connection; 2363 hci_con_handle_t con_handle; 2364 #endif 2365 2366 if (size < 1u) return; 2367 switch (packet_type){ 2368 case HCI_EVENT_PACKET: 2369 switch (hci_event_packet_get_type(packet)) { 2370 #ifdef ENABLE_GATT_OVER_CLASSIC 2371 case L2CAP_EVENT_CHANNEL_OPENED: 2372 status = l2cap_event_channel_opened_get_status(packet); 2373 gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_opened_get_local_cid(packet)); 2374 if (gatt_client != NULL){ 2375 con_handle = l2cap_event_channel_opened_get_handle(packet); 2376 hci_connection = hci_connection_for_handle(con_handle); 2377 if (status == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_RESOURCES){ 2378 if ((hci_connection != NULL) && hci_connection->att_server.incoming_connection_request) { 2379 log_info("Collision, retry in 100ms"); 2380 gatt_client->state = P_W2_L2CAP_CONNECT; 2381 // set timer for retry 2382 btstack_run_loop_set_timer(&gatt_client->gc_timeout, GATT_CLIENT_COLLISION_BACKOFF_MS); 2383 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_classic_retry); 2384 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 2385 break; 2386 } 2387 } 2388 // if status != 0, gatt_client will be discarded 2389 gatt_client->state = P_READY; 2390 gatt_client->con_handle = l2cap_event_channel_opened_get_handle(packet); 2391 gatt_client->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); 2392 gatt_client_classic_handle_connected(gatt_client, status); 2393 } 2394 break; 2395 case L2CAP_EVENT_CHANNEL_CLOSED: 2396 gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_closed_get_local_cid(packet)); 2397 if (gatt_client != NULL){ 2398 // discard gatt client object 2399 gatt_client_classic_handle_disconnected(gatt_client); 2400 } 2401 break; 2402 #endif 2403 case L2CAP_EVENT_CAN_SEND_NOW: 2404 gatt_client_run(); 2405 break; 2406 // att_server has negotiated the mtu for this connection, cache if context exists 2407 case ATT_EVENT_MTU_EXCHANGE_COMPLETE: 2408 if (size < 6u) break; 2409 gatt_client = gatt_client_get_context_for_handle(handle); 2410 if (gatt_client != NULL) { 2411 gatt_client->mtu = little_endian_read_16(packet, 4); 2412 } 2413 break; 2414 default: 2415 break; 2416 } 2417 break; 2418 2419 case ATT_DATA_PACKET: 2420 // special cases: notifications & indications motivate creating context 2421 switch (packet[0]) { 2422 case ATT_HANDLE_VALUE_NOTIFICATION: 2423 case ATT_HANDLE_VALUE_INDICATION: 2424 gatt_client_provide_context_for_handle(handle, &gatt_client); 2425 break; 2426 default: 2427 gatt_client = gatt_client_get_context_for_handle(handle); 2428 break; 2429 } 2430 2431 if (gatt_client != NULL) { 2432 gatt_client_handle_att_response(gatt_client, packet, size); 2433 gatt_client_run(); 2434 } 2435 break; 2436 2437 #ifdef ENABLE_GATT_OVER_CLASSIC 2438 case L2CAP_DATA_PACKET: 2439 gatt_client = gatt_client_get_context_for_l2cap_cid(handle); 2440 if (gatt_client != NULL){ 2441 gatt_client_handle_att_response(gatt_client, packet, size); 2442 gatt_client_run(); 2443 } 2444 break; 2445 #endif 2446 2447 default: 2448 break; 2449 } 2450 } 2451 2452 #ifdef ENABLE_LE_SIGNED_WRITE 2453 static void att_signed_write_handle_cmac_result(uint8_t hash[8]){ 2454 btstack_linked_list_iterator_t it; 2455 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 2456 while (btstack_linked_list_iterator_has_next(&it)){ 2457 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 2458 if (gatt_client->state == P_W4_CMAC_RESULT){ 2459 // store result 2460 (void)memcpy(gatt_client->cmac, hash, 8); 2461 // reverse_64(hash, gatt_client->cmac); 2462 gatt_client->state = P_W2_SEND_SIGNED_WRITE; 2463 gatt_client_run(); 2464 return; 2465 } 2466 } 2467 } 2468 2469 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){ 2470 gatt_client_t * gatt_client; 2471 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2472 if (status != ERROR_CODE_SUCCESS){ 2473 return status; 2474 } 2475 if (is_ready(gatt_client) == 0){ 2476 return GATT_CLIENT_IN_WRONG_STATE; 2477 } 2478 2479 gatt_client->callback = callback; 2480 gatt_client->attribute_handle = value_handle; 2481 gatt_client->attribute_length = message_len; 2482 gatt_client->attribute_value = message; 2483 gatt_client->state = P_W4_IDENTITY_RESOLVING; 2484 gatt_client_run(); 2485 return ERROR_CODE_SUCCESS; 2486 } 2487 #endif 2488 2489 uint8_t gatt_client_discover_primary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2490 gatt_client_t * gatt_client; 2491 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2492 if (status != ERROR_CODE_SUCCESS){ 2493 return status; 2494 } 2495 2496 gatt_client->callback = callback; 2497 gatt_client->start_group_handle = 0x0001; 2498 gatt_client->end_group_handle = 0xffff; 2499 gatt_client->state = P_W2_SEND_SERVICE_QUERY; 2500 gatt_client->uuid16 = GATT_PRIMARY_SERVICE_UUID; 2501 gatt_client_run(); 2502 return ERROR_CODE_SUCCESS; 2503 } 2504 2505 uint8_t gatt_client_discover_secondary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2506 gatt_client_t * gatt_client; 2507 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2508 if (status != ERROR_CODE_SUCCESS){ 2509 return status; 2510 } 2511 2512 gatt_client->callback = callback; 2513 gatt_client->start_group_handle = 0x0001; 2514 gatt_client->end_group_handle = 0xffff; 2515 gatt_client->state = P_W2_SEND_SERVICE_QUERY; 2516 gatt_client->uuid16 = GATT_SECONDARY_SERVICE_UUID; 2517 gatt_client_run(); 2518 return ERROR_CODE_SUCCESS; 2519 } 2520 2521 uint8_t gatt_client_discover_primary_services_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t uuid16){ 2522 gatt_client_t * gatt_client; 2523 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2524 if (status != ERROR_CODE_SUCCESS){ 2525 return status; 2526 } 2527 2528 gatt_client->callback = callback; 2529 gatt_client->start_group_handle = 0x0001; 2530 gatt_client->end_group_handle = 0xffff; 2531 gatt_client->state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 2532 gatt_client->uuid16 = uuid16; 2533 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), gatt_client->uuid16); 2534 gatt_client_run(); 2535 return ERROR_CODE_SUCCESS; 2536 } 2537 2538 uint8_t gatt_client_discover_primary_services_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, const uint8_t * uuid128){ 2539 gatt_client_t * gatt_client; 2540 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2541 if (status != ERROR_CODE_SUCCESS){ 2542 return status; 2543 } 2544 2545 gatt_client->callback = callback; 2546 gatt_client->start_group_handle = 0x0001; 2547 gatt_client->end_group_handle = 0xffff; 2548 gatt_client->uuid16 = 0; 2549 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2550 gatt_client->state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 2551 gatt_client_run(); 2552 return ERROR_CODE_SUCCESS; 2553 } 2554 2555 uint8_t gatt_client_discover_characteristics_for_service(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service){ 2556 gatt_client_t * gatt_client; 2557 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2558 if (status != ERROR_CODE_SUCCESS){ 2559 return status; 2560 } 2561 2562 gatt_client->callback = callback; 2563 gatt_client->start_group_handle = service->start_group_handle; 2564 gatt_client->end_group_handle = service->end_group_handle; 2565 gatt_client->filter_with_uuid = false; 2566 gatt_client->characteristic_start_handle = 0; 2567 gatt_client->state = P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY; 2568 gatt_client_run(); 2569 return ERROR_CODE_SUCCESS; 2570 } 2571 2572 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){ 2573 gatt_client_t * gatt_client; 2574 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2575 if (status != ERROR_CODE_SUCCESS){ 2576 return status; 2577 } 2578 2579 gatt_client->callback = callback; 2580 gatt_client->start_group_handle = service->start_group_handle; 2581 gatt_client->end_group_handle = service->end_group_handle; 2582 gatt_client->state = P_W2_SEND_INCLUDED_SERVICE_QUERY; 2583 2584 gatt_client_run(); 2585 return ERROR_CODE_SUCCESS; 2586 } 2587 2588 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){ 2589 gatt_client_t * gatt_client; 2590 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2591 if (status != ERROR_CODE_SUCCESS){ 2592 return status; 2593 } 2594 2595 gatt_client->callback = callback; 2596 gatt_client->start_group_handle = start_handle; 2597 gatt_client->end_group_handle = end_handle; 2598 gatt_client->filter_with_uuid = true; 2599 gatt_client->uuid16 = uuid16; 2600 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 2601 gatt_client->characteristic_start_handle = 0; 2602 gatt_client->state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 2603 gatt_client_run(); 2604 return ERROR_CODE_SUCCESS; 2605 } 2606 2607 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){ 2608 gatt_client_t * gatt_client; 2609 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2610 if (status != ERROR_CODE_SUCCESS){ 2611 return status; 2612 } 2613 2614 gatt_client->callback = callback; 2615 gatt_client->start_group_handle = start_handle; 2616 gatt_client->end_group_handle = end_handle; 2617 gatt_client->filter_with_uuid = true; 2618 gatt_client->uuid16 = 0; 2619 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2620 gatt_client->characteristic_start_handle = 0; 2621 gatt_client->state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 2622 gatt_client_run(); 2623 return ERROR_CODE_SUCCESS; 2624 } 2625 2626 2627 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){ 2628 return gatt_client_discover_characteristics_for_handle_range_by_uuid16(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid16); 2629 } 2630 2631 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){ 2632 return gatt_client_discover_characteristics_for_handle_range_by_uuid128(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid128); 2633 } 2634 2635 uint8_t gatt_client_discover_characteristic_descriptors(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 2636 gatt_client_t * gatt_client; 2637 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2638 if (status != ERROR_CODE_SUCCESS){ 2639 return status; 2640 } 2641 2642 // check if there is space for characteristics descriptors 2643 if (characteristic->end_handle > characteristic->value_handle){ 2644 gatt_client->callback = callback; 2645 gatt_client->start_group_handle = characteristic->value_handle + 1u; 2646 gatt_client->end_group_handle = characteristic->end_handle; 2647 gatt_client->state = P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY; 2648 gatt_client_run(); 2649 } else { 2650 // schedule gatt complete event on next run loop iteration otherwise 2651 gatt_client->state = P_W2_EMIT_QUERY_COMPLETE_EVENT; 2652 gatt_client_deferred_event_emit.callback = gatt_client_emit_events; 2653 btstack_run_loop_execute_on_main_thread(&gatt_client_deferred_event_emit); 2654 } 2655 return ERROR_CODE_SUCCESS; 2656 } 2657 2658 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){ 2659 gatt_client_t * gatt_client; 2660 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2661 if (status != ERROR_CODE_SUCCESS){ 2662 return status; 2663 } 2664 2665 gatt_client->callback = callback; 2666 gatt_client->attribute_handle = value_handle; 2667 gatt_client->attribute_offset = 0; 2668 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY; 2669 gatt_client_run(); 2670 return ERROR_CODE_SUCCESS; 2671 } 2672 2673 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){ 2674 gatt_client_t * gatt_client; 2675 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2676 if (status != ERROR_CODE_SUCCESS){ 2677 return status; 2678 } 2679 2680 gatt_client->callback = callback; 2681 gatt_client->start_group_handle = start_handle; 2682 gatt_client->end_group_handle = end_handle; 2683 gatt_client->query_start_handle = start_handle; 2684 gatt_client->query_end_handle = end_handle; 2685 gatt_client->uuid16 = uuid16; 2686 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 2687 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2688 gatt_client_run(); 2689 return ERROR_CODE_SUCCESS; 2690 } 2691 2692 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){ 2693 gatt_client_t * gatt_client; 2694 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2695 if (status != ERROR_CODE_SUCCESS){ 2696 return status; 2697 } 2698 2699 gatt_client->callback = callback; 2700 gatt_client->start_group_handle = start_handle; 2701 gatt_client->end_group_handle = end_handle; 2702 gatt_client->query_start_handle = start_handle; 2703 gatt_client->query_end_handle = end_handle; 2704 gatt_client->uuid16 = 0; 2705 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2706 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2707 gatt_client_run(); 2708 return ERROR_CODE_SUCCESS; 2709 } 2710 2711 2712 uint8_t gatt_client_read_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 2713 return gatt_client_read_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); 2714 } 2715 2716 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){ 2717 gatt_client_t * gatt_client; 2718 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2719 if (status != ERROR_CODE_SUCCESS){ 2720 return status; 2721 } 2722 2723 gatt_client->callback = callback; 2724 gatt_client->attribute_handle = value_handle; 2725 gatt_client->attribute_offset = offset; 2726 gatt_client->state = P_W2_SEND_READ_BLOB_QUERY; 2727 gatt_client_run(); 2728 return ERROR_CODE_SUCCESS; 2729 } 2730 2731 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){ 2732 return gatt_client_read_long_value_of_characteristic_using_value_handle_with_offset(callback, con_handle, value_handle, 0); 2733 } 2734 2735 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){ 2736 return gatt_client_read_long_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); 2737 } 2738 2739 static uint8_t gatt_client_read_multiple_characteristic_values_with_state(btstack_packet_handler_t callback, hci_con_handle_t con_handle, int num_value_handles, uint16_t * value_handles, gatt_client_state_t state){ 2740 gatt_client_t * gatt_client; 2741 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2742 if (status != ERROR_CODE_SUCCESS){ 2743 return status; 2744 } 2745 2746 #ifdef ENABLE_GATT_OVER_EATT 2747 if (state == P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST){ 2748 if (gatt_client->bearer_type != ATT_BEARER_ENHANCED_LE){ 2749 return ERROR_CODE_COMMAND_DISALLOWED; 2750 } 2751 } 2752 #endif 2753 2754 gatt_client->callback = callback; 2755 gatt_client->read_multiple_handle_count = num_value_handles; 2756 gatt_client->read_multiple_handles = value_handles; 2757 gatt_client->state = state; 2758 gatt_client_run(); 2759 return ERROR_CODE_SUCCESS; 2760 } 2761 2762 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){ 2763 return gatt_client_read_multiple_characteristic_values_with_state(callback, con_handle, num_value_handles, value_handles, P_W2_SEND_READ_MULTIPLE_REQUEST); 2764 } 2765 2766 #ifdef ENABLE_GATT_OVER_EATT 2767 uint8_t gatt_client_read_multiple_variable_characteristic_values(btstack_packet_handler_t callback, hci_con_handle_t con_handle, int num_value_handles, uint16_t * value_handles){ 2768 return gatt_client_read_multiple_characteristic_values_with_state(callback, con_handle, num_value_handles, value_handles, P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST); 2769 } 2770 #endif 2771 2772 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){ 2773 gatt_client_t * gatt_client; 2774 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2775 if (status != ERROR_CODE_SUCCESS){ 2776 return status; 2777 } 2778 2779 if (value_length > (gatt_client->mtu - 3u)) return GATT_CLIENT_VALUE_TOO_LONG; 2780 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) return GATT_CLIENT_BUSY; 2781 2782 return att_write_request(gatt_client, ATT_WRITE_COMMAND, value_handle, value_length, value); 2783 } 2784 2785 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){ 2786 gatt_client_t * gatt_client; 2787 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2788 if (status != ERROR_CODE_SUCCESS){ 2789 return status; 2790 } 2791 2792 gatt_client->callback = callback; 2793 gatt_client->attribute_handle = value_handle; 2794 gatt_client->attribute_length = value_length; 2795 gatt_client->attribute_value = value; 2796 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 2797 gatt_client_run(); 2798 return ERROR_CODE_SUCCESS; 2799 } 2800 2801 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){ 2802 gatt_client_t * gatt_client; 2803 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2804 if (status != ERROR_CODE_SUCCESS){ 2805 return status; 2806 } 2807 2808 gatt_client->callback = callback; 2809 gatt_client->attribute_handle = value_handle; 2810 gatt_client->attribute_length = value_length; 2811 gatt_client->attribute_offset = offset; 2812 gatt_client->attribute_value = value; 2813 gatt_client->state = P_W2_PREPARE_WRITE; 2814 gatt_client_run(); 2815 return ERROR_CODE_SUCCESS; 2816 } 2817 2818 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){ 2819 return gatt_client_write_long_value_of_characteristic_with_offset(callback, con_handle, value_handle, 0, value_length, value); 2820 } 2821 2822 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){ 2823 gatt_client_t * gatt_client; 2824 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2825 if (status != ERROR_CODE_SUCCESS){ 2826 return status; 2827 } 2828 2829 gatt_client->callback = callback; 2830 gatt_client->attribute_handle = value_handle; 2831 gatt_client->attribute_length = value_length; 2832 gatt_client->attribute_offset = 0; 2833 gatt_client->attribute_value = value; 2834 gatt_client->state = P_W2_PREPARE_RELIABLE_WRITE; 2835 gatt_client_run(); 2836 return ERROR_CODE_SUCCESS; 2837 } 2838 2839 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){ 2840 gatt_client_t * gatt_client; 2841 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2842 if (status != ERROR_CODE_SUCCESS){ 2843 return status; 2844 } 2845 2846 if (configuration > 3){ 2847 return ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE; 2848 } 2849 2850 if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION) && 2851 ((characteristic->properties & ATT_PROPERTY_NOTIFY) == 0u)) { 2852 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED"); 2853 return GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED; 2854 } else if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION) && 2855 ((characteristic->properties & ATT_PROPERTY_INDICATE) == 0u)){ 2856 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED"); 2857 return GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED; 2858 } 2859 2860 gatt_client->callback = callback; 2861 gatt_client->start_group_handle = characteristic->value_handle; 2862 gatt_client->end_group_handle = characteristic->end_handle; 2863 little_endian_store_16(gatt_client->client_characteristic_configuration_value, 0, configuration); 2864 2865 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 2866 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2867 #else 2868 gatt_client->state = P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2869 #endif 2870 gatt_client_run(); 2871 return ERROR_CODE_SUCCESS; 2872 } 2873 2874 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){ 2875 gatt_client_t * gatt_client; 2876 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2877 if (status != ERROR_CODE_SUCCESS){ 2878 return status; 2879 } 2880 2881 gatt_client->callback = callback; 2882 gatt_client->attribute_handle = descriptor_handle; 2883 2884 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 2885 gatt_client_run(); 2886 return ERROR_CODE_SUCCESS; 2887 } 2888 2889 uint8_t gatt_client_read_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor){ 2890 return gatt_client_read_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2891 } 2892 2893 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){ 2894 gatt_client_t * gatt_client; 2895 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2896 if (status != ERROR_CODE_SUCCESS){ 2897 return status; 2898 } 2899 2900 gatt_client->callback = callback; 2901 gatt_client->attribute_handle = descriptor_handle; 2902 gatt_client->attribute_offset = offset; 2903 gatt_client->state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 2904 gatt_client_run(); 2905 return ERROR_CODE_SUCCESS; 2906 } 2907 2908 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){ 2909 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0); 2910 } 2911 2912 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){ 2913 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2914 } 2915 2916 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){ 2917 gatt_client_t * gatt_client; 2918 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2919 if (status != ERROR_CODE_SUCCESS){ 2920 return status; 2921 } 2922 2923 gatt_client->callback = callback; 2924 gatt_client->attribute_handle = descriptor_handle; 2925 gatt_client->attribute_length = value_length; 2926 gatt_client->attribute_offset = 0; 2927 gatt_client->attribute_value = value; 2928 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 2929 gatt_client_run(); 2930 return ERROR_CODE_SUCCESS; 2931 } 2932 2933 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){ 2934 return gatt_client_write_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); 2935 } 2936 2937 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){ 2938 gatt_client_t * gatt_client; 2939 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2940 if (status != ERROR_CODE_SUCCESS){ 2941 return status; 2942 } 2943 2944 gatt_client->callback = callback; 2945 gatt_client->attribute_handle = descriptor_handle; 2946 gatt_client->attribute_length = value_length; 2947 gatt_client->attribute_offset = offset; 2948 gatt_client->attribute_value = value; 2949 gatt_client->state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 2950 gatt_client_run(); 2951 return ERROR_CODE_SUCCESS; 2952 } 2953 2954 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){ 2955 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0, value_length, value); 2956 } 2957 2958 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){ 2959 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); 2960 } 2961 2962 /** 2963 * @brief -> gatt complete event 2964 */ 2965 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){ 2966 gatt_client_t * gatt_client; 2967 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2968 if (status != ERROR_CODE_SUCCESS){ 2969 return status; 2970 } 2971 2972 gatt_client->callback = callback; 2973 gatt_client->attribute_handle = attribute_handle; 2974 gatt_client->attribute_length = value_length; 2975 gatt_client->attribute_offset = offset; 2976 gatt_client->attribute_value = value; 2977 gatt_client->state = P_W2_PREPARE_WRITE_SINGLE; 2978 gatt_client_run(); 2979 return ERROR_CODE_SUCCESS; 2980 } 2981 2982 /** 2983 * @brief -> gatt complete event 2984 */ 2985 uint8_t gatt_client_execute_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2986 gatt_client_t * gatt_client; 2987 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2988 if (status != ERROR_CODE_SUCCESS){ 2989 return status; 2990 } 2991 2992 gatt_client->callback = callback; 2993 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE; 2994 gatt_client_run(); 2995 return ERROR_CODE_SUCCESS; 2996 } 2997 2998 /** 2999 * @brief -> gatt complete event 3000 */ 3001 uint8_t gatt_client_cancel_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3002 gatt_client_t * gatt_client; 3003 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 3004 if (status != ERROR_CODE_SUCCESS){ 3005 return status; 3006 } 3007 3008 gatt_client->callback = callback; 3009 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE; 3010 gatt_client_run(); 3011 return ERROR_CODE_SUCCESS; 3012 } 3013 3014 void gatt_client_deserialize_service(const uint8_t *packet, int offset, gatt_client_service_t * service){ 3015 service->start_group_handle = little_endian_read_16(packet, offset); 3016 service->end_group_handle = little_endian_read_16(packet, offset + 2); 3017 reverse_128(&packet[offset + 4], service->uuid128); 3018 if (uuid_has_bluetooth_prefix(service->uuid128)){ 3019 service->uuid16 = big_endian_read_32(service->uuid128, 0); 3020 } else { 3021 service->uuid16 = 0; 3022 } 3023 } 3024 3025 void gatt_client_deserialize_characteristic(const uint8_t * packet, int offset, gatt_client_characteristic_t * characteristic){ 3026 characteristic->start_handle = little_endian_read_16(packet, offset); 3027 characteristic->value_handle = little_endian_read_16(packet, offset + 2); 3028 characteristic->end_handle = little_endian_read_16(packet, offset + 4); 3029 characteristic->properties = little_endian_read_16(packet, offset + 6); 3030 reverse_128(&packet[offset+8], characteristic->uuid128); 3031 if (uuid_has_bluetooth_prefix(characteristic->uuid128)){ 3032 characteristic->uuid16 = big_endian_read_32(characteristic->uuid128, 0); 3033 } else { 3034 characteristic->uuid16 = 0; 3035 } 3036 } 3037 3038 void gatt_client_deserialize_characteristic_descriptor(const uint8_t * packet, int offset, gatt_client_characteristic_descriptor_t * descriptor){ 3039 descriptor->handle = little_endian_read_16(packet, offset); 3040 reverse_128(&packet[offset+2], descriptor->uuid128); 3041 if (uuid_has_bluetooth_prefix(descriptor->uuid128)){ 3042 descriptor->uuid16 = big_endian_read_32(descriptor->uuid128, 0); 3043 } else { 3044 descriptor->uuid16 = 0; 3045 } 3046 } 3047 3048 void gatt_client_send_mtu_negotiation(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3049 gatt_client_t * gatt_client; 3050 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3051 if (status != ERROR_CODE_SUCCESS){ 3052 return; 3053 } 3054 if (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED){ 3055 gatt_client->callback = callback; 3056 gatt_client->mtu_state = SEND_MTU_EXCHANGE; 3057 gatt_client_run(); 3058 } 3059 } 3060 3061 uint8_t gatt_client_request_to_write_without_response(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 3062 gatt_client_t * gatt_client; 3063 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3064 if (status != ERROR_CODE_SUCCESS){ 3065 return status; 3066 } 3067 bool added = btstack_linked_list_add_tail(&gatt_client->write_without_response_requests, (btstack_linked_item_t*) callback_registration); 3068 if (added == false){ 3069 return ERROR_CODE_COMMAND_DISALLOWED; 3070 } else { 3071 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 3072 return ERROR_CODE_SUCCESS; 3073 } 3074 } 3075 3076 uint8_t gatt_client_request_to_send_gatt_query(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 3077 gatt_client_t * gatt_client; 3078 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3079 if (status != ERROR_CODE_SUCCESS){ 3080 return status; 3081 } 3082 bool added = btstack_linked_list_add_tail(&gatt_client->query_requests, (btstack_linked_item_t*) callback_registration); 3083 if (added == false){ 3084 return ERROR_CODE_COMMAND_DISALLOWED; 3085 } else { 3086 gatt_client_notify_can_send_query(gatt_client); 3087 return ERROR_CODE_SUCCESS; 3088 } 3089 } 3090 3091 uint8_t gatt_client_remove_gatt_query(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 3092 gatt_client_t * gatt_client; 3093 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3094 if (status != ERROR_CODE_SUCCESS){ 3095 return status; 3096 } 3097 (void)btstack_linked_list_remove(&gatt_client->query_requests, (btstack_linked_item_t*) callback_registration); 3098 return ERROR_CODE_SUCCESS; 3099 } 3100 3101 uint8_t gatt_client_request_can_write_without_response_event(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3102 gatt_client_t * gatt_client; 3103 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3104 if (status != ERROR_CODE_SUCCESS){ 3105 return status; 3106 } 3107 if (gatt_client->write_without_response_callback != NULL){ 3108 return GATT_CLIENT_IN_WRONG_STATE; 3109 } 3110 gatt_client->write_without_response_callback = callback; 3111 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 3112 return ERROR_CODE_SUCCESS; 3113 } 3114 3115 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 3116 void gatt_client_add_service_changed_handler(btstack_packet_callback_registration_t * callback) { 3117 btstack_linked_list_add_tail(&gatt_client_service_changed_handler, (btstack_linked_item_t*) callback); 3118 } 3119 3120 void gatt_client_remove_service_changed_handler(btstack_packet_callback_registration_t * callback){ 3121 btstack_linked_list_remove(&gatt_client_service_changed_handler, (btstack_linked_item_t*) callback); 3122 } 3123 #endif 3124 3125 #if defined(ENABLE_GATT_OVER_CLASSIC) || defined(ENABLE_GATT_OVER_EATT) 3126 3127 #include "hci_event.h" 3128 3129 static const hci_event_t gatt_client_connected = { 3130 GATT_EVENT_CONNECTED, 0, "11BH" 3131 }; 3132 3133 static const hci_event_t gatt_client_disconnected = { 3134 GATT_EVENT_DISCONNECTED, 0, "H" 3135 }; 3136 3137 static void 3138 gatt_client_emit_connected(btstack_packet_handler_t callback, uint8_t status, bd_addr_type_t addr_type, bd_addr_t addr, 3139 hci_con_handle_t con_handle) { 3140 uint8_t buffer[20]; 3141 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_connected, status, addr, con_handle); 3142 (*callback)(HCI_EVENT_PACKET, 0, buffer, len); 3143 } 3144 3145 #endif 3146 3147 #ifdef ENABLE_GATT_OVER_CLASSIC 3148 3149 #include "bluetooth_psm.h" 3150 3151 // single active SDP query 3152 static gatt_client_t * gatt_client_classic_active_sdp_query; 3153 3154 // macos protocol descriptor list requires 16 bytes 3155 static uint8_t gatt_client_classic_sdp_buffer[32]; 3156 3157 3158 static gatt_client_t * gatt_client_get_context_for_classic_addr(bd_addr_t addr){ 3159 btstack_linked_item_t *it; 3160 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 3161 gatt_client_t * gatt_client = (gatt_client_t *) it; 3162 if (memcmp(gatt_client->addr, addr, 6) == 0){ 3163 return gatt_client; 3164 } 3165 } 3166 return NULL; 3167 } 3168 3169 static gatt_client_t * gatt_client_get_context_for_l2cap_cid(uint16_t l2cap_cid){ 3170 btstack_linked_item_t *it; 3171 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 3172 gatt_client_t * gatt_client = (gatt_client_t *) it; 3173 if (gatt_client->l2cap_cid == l2cap_cid){ 3174 return gatt_client; 3175 } 3176 } 3177 return NULL; 3178 } 3179 3180 static void gatt_client_classic_handle_connected(gatt_client_t * gatt_client, uint8_t status){ 3181 // cache peer information 3182 bd_addr_t addr; 3183 // cppcheck-suppress uninitvar ; addr is reported as uninitialized although it's the destination of the memcpy 3184 memcpy(addr, gatt_client->addr, 6); 3185 bd_addr_type_t addr_type = gatt_client->addr_type; 3186 gatt_client->addr_type = BD_ADDR_TYPE_ACL; 3187 hci_con_handle_t con_handle = gatt_client->con_handle; 3188 btstack_packet_handler_t callback = gatt_client->callback; 3189 3190 if (status != ERROR_CODE_SUCCESS){ 3191 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 3192 btstack_memory_gatt_client_free(gatt_client); 3193 } 3194 3195 gatt_client_emit_connected(callback, status, addr_type, addr, con_handle); 3196 } 3197 3198 static void gatt_client_classic_retry(btstack_timer_source_t * ts){ 3199 gatt_client_t * gatt_client = gatt_client_for_timer(ts); 3200 if (gatt_client != NULL){ 3201 gatt_client->state = P_W4_L2CAP_CONNECTION; 3202 att_dispatch_classic_connect(gatt_client->addr, gatt_client->l2cap_psm, &gatt_client->l2cap_cid); 3203 } 3204 } 3205 3206 static void gatt_client_classic_handle_disconnected(gatt_client_t * gatt_client){ 3207 3208 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 3209 gatt_client_timeout_stop(gatt_client); 3210 3211 hci_con_handle_t con_handle = gatt_client->con_handle; 3212 btstack_packet_handler_t callback = gatt_client->callback; 3213 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 3214 btstack_memory_gatt_client_free(gatt_client); 3215 3216 uint8_t buffer[20]; 3217 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_disconnected, con_handle); 3218 (*callback)(HCI_EVENT_PACKET, 0, buffer, len); 3219 } 3220 3221 static void gatt_client_handle_sdp_client_query_attribute_value(gatt_client_t * connection, uint8_t *packet){ 3222 des_iterator_t des_list_it; 3223 des_iterator_t prot_it; 3224 3225 if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= sizeof(gatt_client_classic_sdp_buffer)) { 3226 gatt_client_classic_sdp_buffer[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); 3227 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)) { 3228 switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) { 3229 case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST: 3230 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)) { 3231 uint8_t *des_element; 3232 uint8_t *element; 3233 uint32_t uuid; 3234 3235 if (des_iterator_get_type(&des_list_it) != DE_DES) continue; 3236 3237 des_element = des_iterator_get_element(&des_list_it); 3238 des_iterator_init(&prot_it, des_element); 3239 element = des_iterator_get_element(&prot_it); 3240 3241 if (de_get_element_type(element) != DE_UUID) continue; 3242 3243 uuid = de_get_uuid32(element); 3244 des_iterator_next(&prot_it); 3245 // we assume that the even if there are both roles supported, remote device uses the same psm and avdtp version for both 3246 switch (uuid){ 3247 case BLUETOOTH_PROTOCOL_L2CAP: 3248 if (!des_iterator_has_more(&prot_it)) continue; 3249 de_element_get_uint16(des_iterator_get_element(&prot_it), &connection->l2cap_psm); 3250 break; 3251 default: 3252 break; 3253 } 3254 } 3255 break; 3256 3257 default: 3258 break; 3259 } 3260 } 3261 } 3262 } 3263 3264 static void gatt_client_classic_sdp_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 3265 gatt_client_t * gatt_client = gatt_client_classic_active_sdp_query; 3266 btstack_assert(gatt_client != NULL); 3267 uint8_t status; 3268 3269 // TODO: handle sdp events, get l2cap psm 3270 switch (hci_event_packet_get_type(packet)){ 3271 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: 3272 gatt_client_handle_sdp_client_query_attribute_value(gatt_client, packet); 3273 // TODO: 3274 return; 3275 case SDP_EVENT_QUERY_COMPLETE: 3276 status = sdp_event_query_complete_get_status(packet); 3277 gatt_client_classic_active_sdp_query = NULL; 3278 log_info("l2cap psm: %0x, status %02x", gatt_client->l2cap_psm, status); 3279 if (status != ERROR_CODE_SUCCESS) break; 3280 if (gatt_client->l2cap_psm == 0) { 3281 status = SDP_SERVICE_NOT_FOUND; 3282 break; 3283 } 3284 break; 3285 default: 3286 btstack_assert(false); 3287 return; 3288 } 3289 3290 // done 3291 if (status == ERROR_CODE_SUCCESS){ 3292 gatt_client->state = P_W4_L2CAP_CONNECTION; 3293 status = att_dispatch_classic_connect(gatt_client->addr, gatt_client->l2cap_psm, &gatt_client->l2cap_cid); 3294 } 3295 if (status != ERROR_CODE_SUCCESS) { 3296 gatt_client_classic_handle_connected(gatt_client, status); 3297 } 3298 } 3299 3300 static void gatt_client_classic_sdp_start(void * context){ 3301 gatt_client_classic_active_sdp_query = (gatt_client_t *) context; 3302 gatt_client_classic_active_sdp_query->state = P_W4_SDP_QUERY; 3303 sdp_client_query_uuid16(gatt_client_classic_sdp_handler, gatt_client_classic_active_sdp_query->addr, ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 3304 } 3305 3306 static void gatt_client_classic_emit_connected(void * context){ 3307 gatt_client_t * gatt_client = (gatt_client_t *) context; 3308 gatt_client->state = P_READY; 3309 gatt_client_emit_connected(gatt_client->callback, ERROR_CODE_SUCCESS, gatt_client->addr_type, gatt_client->addr, gatt_client->con_handle); 3310 } 3311 3312 uint8_t gatt_client_classic_connect(btstack_packet_handler_t callback, bd_addr_t addr){ 3313 gatt_client_t * gatt_client = gatt_client_get_context_for_classic_addr(addr); 3314 if (gatt_client != NULL){ 3315 return ERROR_CODE_ACL_CONNECTION_ALREADY_EXISTS; 3316 } 3317 gatt_client = btstack_memory_gatt_client_get(); 3318 if (gatt_client == NULL){ 3319 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 3320 } 3321 // init state 3322 gatt_client->bearer_type = ATT_BEARER_UNENHANCED_CLASSIC; 3323 gatt_client->con_handle = HCI_CON_HANDLE_INVALID; 3324 memcpy(gatt_client->addr, addr, 6); 3325 gatt_client->addr_type = BD_ADDR_TYPE_ACL; 3326 gatt_client->mtu = ATT_DEFAULT_MTU; 3327 gatt_client->security_level = LEVEL_0; 3328 gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 3329 gatt_client->callback = callback; 3330 #ifdef ENABLE_GATT_OVER_EATT 3331 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3332 #endif 3333 btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); 3334 3335 // schedule emitted event if already connected, otherwise 3336 bool already_connected = false; 3337 hci_connection_t * hci_connection = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL); 3338 if (hci_connection != NULL){ 3339 if (hci_connection->att_server.l2cap_cid != 0){ 3340 already_connected = true; 3341 } 3342 } 3343 gatt_client->callback_request.context = gatt_client; 3344 if (already_connected){ 3345 gatt_client->con_handle = hci_connection->con_handle; 3346 gatt_client->callback_request.callback = &gatt_client_classic_emit_connected; 3347 gatt_client->state = P_W2_EMIT_CONNECTED; 3348 btstack_run_loop_execute_on_main_thread(&gatt_client->callback_request); 3349 } else { 3350 gatt_client->callback_request.callback = &gatt_client_classic_sdp_start; 3351 gatt_client->state = P_W2_SDP_QUERY; 3352 sdp_client_register_query_callback(&gatt_client->callback_request); 3353 } 3354 return ERROR_CODE_SUCCESS; 3355 } 3356 3357 uint8_t gatt_client_classic_disconnect(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3358 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 3359 if (gatt_client == NULL){ 3360 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 3361 } 3362 gatt_client->callback = callback; 3363 return l2cap_disconnect(gatt_client->l2cap_cid); 3364 } 3365 #endif 3366 3367 #ifdef ENABLE_GATT_OVER_EATT 3368 3369 #define MAX_NR_EATT_CHANNELS 5 3370 3371 static void gatt_client_le_enhanced_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 3372 3373 static uint8_t gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client_t * gatt_client, gatt_client_state_t state){ 3374 uint8_t num_clients = 0; 3375 btstack_linked_list_iterator_t it; 3376 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 3377 while (btstack_linked_list_iterator_has_next(&it)){ 3378 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3379 if (eatt_client->state == state){ 3380 num_clients++; 3381 } 3382 } 3383 return num_clients; 3384 } 3385 3386 static void gatt_client_eatt_finalize(gatt_client_t * gatt_client) { 3387 // free eatt clients 3388 btstack_linked_list_iterator_t it; 3389 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3390 while (btstack_linked_list_iterator_has_next(&it)) { 3391 gatt_client_t *eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3392 btstack_linked_list_iterator_remove(&it); 3393 btstack_memory_gatt_client_free(eatt_client); 3394 } 3395 } 3396 3397 // all channels connected 3398 static void gatt_client_le_enhanced_handle_connected(gatt_client_t * gatt_client, uint8_t status) { 3399 if (status == ERROR_CODE_SUCCESS){ 3400 uint8_t num_ready = gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client, P_READY); 3401 if (num_ready > 0){ 3402 gatt_client->eatt_state = GATT_CLIENT_EATT_READY; 3403 // free unused channels 3404 btstack_linked_list_iterator_t it; 3405 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3406 while (btstack_linked_list_iterator_has_next(&it)) { 3407 gatt_client_t *eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3408 if (eatt_client->state == P_L2CAP_CLOSED){ 3409 btstack_linked_list_iterator_remove(&it); 3410 btstack_memory_gatt_client_free(eatt_client); 3411 } 3412 } 3413 } else { 3414 hci_connection_t * hci_connection = hci_connection_for_handle(gatt_client->con_handle); 3415 btstack_assert(hci_connection != NULL); 3416 if (hci_connection->att_server.incoming_connection_request){ 3417 hci_connection->att_server.incoming_connection_request = false; 3418 log_info("Collision, retry in 100ms"); 3419 gatt_client->state = P_W2_L2CAP_CONNECT; 3420 // set timer for retry 3421 btstack_run_loop_set_timer(&gatt_client->gc_timeout, GATT_CLIENT_COLLISION_BACKOFF_MS); 3422 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_le_enhanced_retry); 3423 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 3424 return; 3425 } else { 3426 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3427 status = ERROR_CODE_CONNECTION_REJECTED_DUE_TO_LIMITED_RESOURCES; 3428 } 3429 } 3430 } else { 3431 gatt_client_eatt_finalize(gatt_client); 3432 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3433 } 3434 3435 gatt_client_emit_connected(gatt_client->callback, status, gatt_client->addr_type, gatt_client->addr, gatt_client->con_handle); 3436 } 3437 3438 // single channel disconnected 3439 static void gatt_client_le_enhanced_handle_ecbm_disconnected(gatt_client_t * gatt_client, gatt_client_t * eatt_client) { 3440 3441 // report error 3442 gatt_client_report_error_if_pending(eatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 3443 3444 // free memory 3445 btstack_linked_list_remove(&gatt_client->eatt_clients, (btstack_linked_item_t *) eatt_client); 3446 btstack_memory_gatt_client_free(eatt_client); 3447 3448 // last channel 3449 if (btstack_linked_list_empty(&gatt_client->eatt_clients)){ 3450 hci_connection_t * hci_connection = hci_connection_for_handle(gatt_client->con_handle); 3451 hci_connection->att_server.eatt_outgoing_active = false; 3452 3453 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY) { 3454 // report disconnected if last channel closed 3455 uint8_t buffer[20]; 3456 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_disconnected, gatt_client->con_handle); 3457 (*gatt_client->callback)(HCI_EVENT_PACKET, 0, buffer, len); 3458 } 3459 } 3460 } 3461 3462 static gatt_client_t * gatt_client_le_enhanced_get_context_for_l2cap_cid(uint16_t l2cap_cid, gatt_client_t ** out_eatt_client){ 3463 btstack_linked_list_iterator_t it; 3464 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3465 while (btstack_linked_list_iterator_has_next(&it)) { 3466 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3467 btstack_linked_list_iterator_t it2; 3468 btstack_linked_list_iterator_init(&it2, &gatt_client->eatt_clients); 3469 while (btstack_linked_list_iterator_has_next(&it2)) { 3470 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it2); 3471 if (eatt_client->l2cap_cid == l2cap_cid){ 3472 *out_eatt_client = eatt_client; 3473 return gatt_client; 3474 } 3475 } 3476 } 3477 return NULL; 3478 } 3479 3480 static void gatt_client_le_enhanced_setup_l2cap_channel(gatt_client_t * gatt_client){ 3481 uint8_t num_channels = gatt_client->eatt_num_clients; 3482 3483 // setup channels 3484 uint16_t buffer_size_per_client = gatt_client->eatt_storage_size / num_channels; 3485 uint16_t max_mtu = (buffer_size_per_client - REPORT_PREBUFFER_HEADER) / 2; 3486 uint8_t * receive_buffers[MAX_NR_EATT_CHANNELS]; 3487 uint16_t new_cids[MAX_NR_EATT_CHANNELS]; 3488 memset(gatt_client->eatt_storage_buffer, 0, gatt_client->eatt_storage_size); 3489 uint8_t i; 3490 for (i=0;i<gatt_client->eatt_num_clients; i++){ 3491 receive_buffers[i] = &gatt_client->eatt_storage_buffer[REPORT_PREBUFFER_HEADER]; 3492 gatt_client->eatt_storage_buffer += REPORT_PREBUFFER_HEADER + max_mtu; 3493 } 3494 3495 log_info("%u EATT clients with receive buffer size %u", gatt_client->eatt_num_clients, buffer_size_per_client); 3496 3497 uint8_t status = l2cap_ecbm_create_channels(&gatt_client_le_enhanced_packet_handler, 3498 gatt_client->con_handle, 3499 gatt_client->security_level, 3500 BLUETOOTH_PSM_EATT, num_channels, 3501 L2CAP_LE_AUTOMATIC_CREDITS, 3502 buffer_size_per_client, 3503 receive_buffers, 3504 new_cids); 3505 3506 if (status == ERROR_CODE_SUCCESS){ 3507 i = 0; 3508 btstack_linked_list_iterator_t it; 3509 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 3510 while (btstack_linked_list_iterator_has_next(&it)) { 3511 gatt_client_t *new_eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3512 3513 // init state with new cid and transmit buffer 3514 new_eatt_client->bearer_type = ATT_BEARER_ENHANCED_LE; 3515 new_eatt_client->con_handle = gatt_client->con_handle; 3516 new_eatt_client->mtu = 64; 3517 new_eatt_client->security_level = LEVEL_0; 3518 new_eatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 3519 new_eatt_client->state = P_W4_L2CAP_CONNECTION; 3520 new_eatt_client->l2cap_cid = new_cids[i]; 3521 new_eatt_client->eatt_storage_buffer = gatt_client->eatt_storage_buffer; 3522 gatt_client->eatt_storage_buffer += max_mtu; 3523 i++; 3524 } 3525 gatt_client->eatt_state = GATT_CLIENT_EATT_L2CAP_SETUP; 3526 } else { 3527 gatt_client_le_enhanced_handle_connected(gatt_client, status); 3528 } 3529 } 3530 3531 static void gatt_client_le_enhanced_retry(btstack_timer_source_t * ts){ 3532 gatt_client_t * gatt_client = gatt_client_for_timer(ts); 3533 if (gatt_client != NULL){ 3534 gatt_client->state = P_W4_L2CAP_CONNECTION; 3535 gatt_client_le_enhanced_setup_l2cap_channel(gatt_client); 3536 } 3537 } 3538 3539 static void gatt_client_le_enhanced_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) { 3540 gatt_client_t *gatt_client; 3541 gatt_client_t *eatt_client; 3542 hci_con_handle_t con_handle; 3543 uint16_t l2cap_cid; 3544 uint8_t status; 3545 gatt_client_characteristic_t characteristic; 3546 gatt_client_service_t service; 3547 switch (packet_type) { 3548 case HCI_EVENT_PACKET: 3549 switch (hci_event_packet_get_type(packet)) { 3550 case GATT_EVENT_SERVICE_QUERY_RESULT: 3551 con_handle = gatt_event_service_query_result_get_handle(packet); 3552 gatt_client = gatt_client_get_context_for_handle(con_handle); 3553 btstack_assert(gatt_client != NULL); 3554 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE); 3555 gatt_event_service_query_result_get_service(packet, &service); 3556 gatt_client->gatt_service_start_group_handle = service.start_group_handle; 3557 gatt_client->gatt_service_end_group_handle = service.end_group_handle; 3558 break; 3559 case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: 3560 con_handle = gatt_event_characteristic_value_query_result_get_handle(packet); 3561 gatt_client = gatt_client_get_context_for_handle(con_handle); 3562 btstack_assert(gatt_client != NULL); 3563 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE); 3564 if (gatt_event_characteristic_value_query_result_get_value_length(packet) >= 1) { 3565 gatt_client->gatt_server_supported_features = gatt_event_characteristic_value_query_result_get_value(packet)[0]; 3566 } 3567 break; 3568 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 3569 con_handle = gatt_event_characteristic_query_result_get_handle(packet); 3570 gatt_client = gatt_client_get_context_for_handle(con_handle); 3571 btstack_assert(gatt_client != NULL); 3572 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE); 3573 gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic); 3574 gatt_client->gatt_client_supported_features_handle = characteristic.value_handle; 3575 break; 3576 case GATT_EVENT_QUERY_COMPLETE: 3577 con_handle = gatt_event_query_complete_get_handle(packet); 3578 gatt_client = gatt_client_get_context_for_handle(con_handle); 3579 btstack_assert(gatt_client != NULL); 3580 switch (gatt_client->eatt_state){ 3581 case GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE: 3582 if (gatt_client->gatt_service_start_group_handle == 0){ 3583 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3584 } else { 3585 gatt_client->eatt_state = GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W2_SEND; 3586 } 3587 break; 3588 case GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE: 3589 if ((gatt_client->gatt_server_supported_features & 1) == 0) { 3590 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3591 } else { 3592 gatt_client->eatt_state = GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W2_SEND; 3593 } 3594 break; 3595 case GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE: 3596 if (gatt_client->gatt_client_supported_features_handle == 0){ 3597 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3598 } else { 3599 gatt_client->eatt_state = GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W2_SEND; 3600 } 3601 break; 3602 case GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W4_DONE: 3603 gatt_client_le_enhanced_setup_l2cap_channel(gatt_client); 3604 break; 3605 default: 3606 break; 3607 } 3608 break; 3609 case L2CAP_EVENT_ECBM_CHANNEL_OPENED: 3610 l2cap_cid = l2cap_event_ecbm_channel_opened_get_local_cid(packet); 3611 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(l2cap_cid, &eatt_client); 3612 3613 btstack_assert(gatt_client != NULL); 3614 btstack_assert(eatt_client != NULL); 3615 btstack_assert(eatt_client->state == P_W4_L2CAP_CONNECTION); 3616 3617 status = l2cap_event_channel_opened_get_status(packet); 3618 if (status == ERROR_CODE_SUCCESS){ 3619 eatt_client->state = P_READY; 3620 eatt_client->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); 3621 } else { 3622 eatt_client->state = P_L2CAP_CLOSED; 3623 } 3624 // connected if opened event for all channels received 3625 if (gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client, P_W4_L2CAP_CONNECTION) == 0){ 3626 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_SUCCESS); 3627 } 3628 break; 3629 case L2CAP_EVENT_CHANNEL_CLOSED: 3630 l2cap_cid = l2cap_event_channel_closed_get_local_cid(packet); 3631 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(l2cap_cid, &eatt_client); 3632 btstack_assert(gatt_client != NULL); 3633 btstack_assert(eatt_client != NULL); 3634 gatt_client_le_enhanced_handle_ecbm_disconnected(gatt_client, eatt_client); 3635 break; 3636 default: 3637 break; 3638 } 3639 break; 3640 case L2CAP_DATA_PACKET: 3641 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(channel, &eatt_client); 3642 btstack_assert(gatt_client != NULL); 3643 btstack_assert(eatt_client != NULL); 3644 gatt_client_handle_att_response(eatt_client, packet, size); 3645 gatt_client_run(); 3646 break; 3647 default: 3648 break; 3649 } 3650 } 3651 3652 static bool gatt_client_le_enhanced_handle_can_send_query(gatt_client_t * gatt_client){ 3653 uint8_t status = ERROR_CODE_SUCCESS; 3654 uint8_t gatt_client_supported_features = 0x06; // eatt + multiple value notifications 3655 switch (gatt_client->eatt_state){ 3656 case GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W2_SEND: 3657 gatt_client->gatt_service_start_group_handle = 0; 3658 gatt_client->eatt_state = GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE; 3659 status = gatt_client_discover_primary_services_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3660 gatt_client->con_handle, 3661 ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 3662 break; 3663 case GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W2_SEND: 3664 gatt_client->gatt_server_supported_features = 0; 3665 gatt_client->eatt_state = GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE; 3666 status = gatt_client_read_value_of_characteristics_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3667 gatt_client->con_handle, 3668 gatt_client->gatt_service_start_group_handle, 3669 gatt_client->gatt_service_end_group_handle, 3670 ORG_BLUETOOTH_CHARACTERISTIC_SERVER_SUPPORTED_FEATURES); 3671 return true; 3672 case GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W2_SEND: 3673 gatt_client->gatt_client_supported_features_handle = 0; 3674 gatt_client->eatt_state = GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE; 3675 status = gatt_client_discover_characteristics_for_handle_range_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3676 gatt_client->con_handle, 3677 gatt_client->gatt_service_start_group_handle, 3678 gatt_client->gatt_service_end_group_handle, 3679 ORG_BLUETOOTH_CHARACTERISTIC_CLIENT_SUPPORTED_FEATURES); 3680 return true; 3681 case GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W2_SEND: 3682 gatt_client->eatt_state = GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W4_DONE; 3683 status = gatt_client_write_value_of_characteristic(&gatt_client_le_enhanced_packet_handler, gatt_client->con_handle, 3684 gatt_client->gatt_client_supported_features_handle, 1, 3685 &gatt_client_supported_features); 3686 return true; 3687 default: 3688 break; 3689 } 3690 btstack_assert(status == ERROR_CODE_SUCCESS); 3691 UNUSED(status); 3692 return false; 3693 } 3694 3695 uint8_t gatt_client_le_enhanced_connect(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint8_t num_channels, uint8_t * storage_buffer, uint16_t storage_size) { 3696 gatt_client_t * gatt_client; 3697 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3698 if (status != ERROR_CODE_SUCCESS){ 3699 return status; 3700 } 3701 3702 if (gatt_client->eatt_state != GATT_CLIENT_EATT_IDLE){ 3703 return ERROR_CODE_COMMAND_DISALLOWED; 3704 } 3705 3706 // need one buffer for sending and one for receiving. Receiving includes pre-buffer for reports 3707 uint16_t buffer_size_per_client = storage_size / num_channels; 3708 uint16_t max_mtu = (buffer_size_per_client - REPORT_PREBUFFER_HEADER) / 2; 3709 if (max_mtu < 64) { 3710 return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS; 3711 } 3712 3713 if ((num_channels == 0) || (num_channels > MAX_NR_EATT_CHANNELS)){ 3714 return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS; 3715 } 3716 3717 // create max num_channel eatt clients 3718 uint8_t i; 3719 btstack_linked_list_t eatt_clients = NULL; 3720 for (i=0;i<num_channels;i++) { 3721 gatt_client_t * new_gatt_client = btstack_memory_gatt_client_get(); 3722 if (new_gatt_client == NULL) { 3723 break; 3724 } 3725 btstack_linked_list_add(&eatt_clients, (btstack_linked_item_t*)new_gatt_client); 3726 } 3727 3728 if (i != num_channels){ 3729 while (true){ 3730 gatt_client = (gatt_client_t *) btstack_linked_list_pop(&eatt_clients); 3731 if (gatt_client == NULL) { 3732 break; 3733 } 3734 btstack_memory_gatt_client_free(gatt_client); 3735 } 3736 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 3737 } 3738 3739 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 3740 hci_connection->att_server.eatt_outgoing_active = true; 3741 3742 gatt_client->callback = callback; 3743 gatt_client->eatt_num_clients = num_channels; 3744 gatt_client->eatt_storage_buffer = storage_buffer; 3745 gatt_client->eatt_storage_size = storage_size; 3746 gatt_client->eatt_clients = eatt_clients; 3747 gatt_client->eatt_state = GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W2_SEND; 3748 gatt_client_notify_can_send_query(gatt_client); 3749 3750 return ERROR_CODE_SUCCESS; 3751 } 3752 3753 #endif 3754 3755 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 3756 void gatt_client_att_packet_handler_fuzz(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 3757 gatt_client_att_packet_handler(packet_type, handle, packet, size); 3758 } 3759 3760 uint8_t gatt_client_get_client(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 3761 uint8_t status = gatt_client_provide_context_for_handle(con_handle, out_gatt_client); 3762 return status; 3763 } 3764 #endif 3765