1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN 24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "gatt_client.c" 39 40 #include <stdint.h> 41 #include <string.h> 42 #include <stddef.h> 43 44 #include "btstack_config.h" 45 46 #include "ble/att_dispatch.h" 47 #include "ble/att_db.h" 48 #include "ble/gatt_client.h" 49 #include "ble/le_device_db.h" 50 #include "ble/sm.h" 51 #include "bluetooth_psm.h" 52 #include "btstack_debug.h" 53 #include "btstack_event.h" 54 #include "btstack_memory.h" 55 #include "btstack_run_loop.h" 56 #include "btstack_util.h" 57 #include "hci.h" 58 #include "hci_dump.h" 59 #include "hci_event_builder.h" 60 #include "l2cap.h" 61 #include "classic/sdp_client.h" 62 #include "bluetooth_gatt.h" 63 #include "bluetooth_sdp.h" 64 #include "classic/sdp_util.h" 65 66 #if defined(ENABLE_GATT_OVER_EATT) && !defined(ENABLE_L2CAP_ENHANCED_CREDIT_BASED_FLOW_CONTROL_MODE) 67 #error "GATT Over EATT requires support for L2CAP Enhanced CoC. Please enable ENABLE_L2CAP_ENHANCED_CREDIT_BASED_FLOW_CONTROL_MODE" 68 #endif 69 70 // L2CAP Test Spec p35 defines a minimum of 100 ms, but PTS might indicate an error if we sent after 100 ms 71 #define GATT_CLIENT_COLLISION_BACKOFF_MS 150 72 73 static btstack_linked_list_t gatt_client_connections; 74 static btstack_linked_list_t gatt_client_value_listeners; 75 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 76 static btstack_linked_list_t gatt_client_service_changed_handler; 77 #endif 78 static btstack_packet_callback_registration_t hci_event_callback_registration; 79 static btstack_packet_callback_registration_t sm_event_callback_registration; 80 static btstack_context_callback_registration_t gatt_client_deferred_event_emit; 81 82 // GATT Client Configuration 83 static bool gatt_client_mtu_exchange_enabled; 84 static gap_security_level_t gatt_client_required_security_level; 85 86 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size); 87 static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 88 static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code); 89 90 #ifdef ENABLE_LE_SIGNED_WRITE 91 static void att_signed_write_handle_cmac_result(uint8_t hash[8]); 92 #endif 93 94 #ifdef ENABLE_GATT_OVER_CLASSIC 95 static gatt_client_t * gatt_client_get_context_for_l2cap_cid(uint16_t l2cap_cid); 96 static void gatt_client_classic_handle_connected(gatt_client_t * gatt_client, uint8_t status); 97 static void gatt_client_classic_handle_disconnected(gatt_client_t * gatt_client); 98 static void gatt_client_classic_retry(btstack_timer_source_t * ts); 99 #endif 100 101 #ifdef ENABLE_GATT_OVER_EATT 102 static bool gatt_client_le_enhanced_handle_can_send_query(gatt_client_t * gatt_client); 103 static void gatt_client_le_enhanced_retry(btstack_timer_source_t * ts); 104 #endif 105 106 void gatt_client_init(void){ 107 gatt_client_connections = NULL; 108 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 109 gatt_client_service_changed_handler = NULL; 110 #endif 111 // default configuration 112 gatt_client_mtu_exchange_enabled = true; 113 gatt_client_required_security_level = LEVEL_0; 114 115 // register for HCI Events 116 hci_event_callback_registration.callback = &gatt_client_event_packet_handler; 117 hci_add_event_handler(&hci_event_callback_registration); 118 119 // register for SM Events 120 sm_event_callback_registration.callback = &gatt_client_event_packet_handler; 121 sm_add_event_handler(&sm_event_callback_registration); 122 123 // and ATT Client PDUs 124 att_dispatch_register_client(gatt_client_att_packet_handler); 125 } 126 127 void gatt_client_set_required_security_level(gap_security_level_t level){ 128 gatt_client_required_security_level = level; 129 } 130 131 static gatt_client_t * gatt_client_for_timer(btstack_timer_source_t * ts){ 132 btstack_linked_list_iterator_t it; 133 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 134 while (btstack_linked_list_iterator_has_next(&it)){ 135 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 136 if (&gatt_client->gc_timeout == ts) { 137 return gatt_client; 138 } 139 } 140 return NULL; 141 } 142 143 static void gatt_client_timeout_handler(btstack_timer_source_t * timer){ 144 gatt_client_t * gatt_client = gatt_client_for_timer(timer); 145 if (gatt_client == NULL) return; 146 log_info("GATT client timeout handle, handle 0x%02x", gatt_client->con_handle); 147 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_TIMEOUT); 148 } 149 150 static void gatt_client_timeout_start(gatt_client_t * gatt_client){ 151 log_debug("GATT client timeout start, handle 0x%02x", gatt_client->con_handle); 152 btstack_run_loop_remove_timer(&gatt_client->gc_timeout); 153 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_timeout_handler); 154 btstack_run_loop_set_timer(&gatt_client->gc_timeout, 30000); // 30 seconds sm timeout 155 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 156 } 157 158 static void gatt_client_timeout_stop(gatt_client_t * gatt_client){ 159 log_debug("GATT client timeout stop, handle 0x%02x", gatt_client->con_handle); 160 btstack_run_loop_remove_timer(&gatt_client->gc_timeout); 161 } 162 163 static gap_security_level_t gatt_client_le_security_level_for_connection(hci_con_handle_t con_handle){ 164 uint8_t encryption_key_size = gap_encryption_key_size(con_handle); 165 if (encryption_key_size == 0) return LEVEL_0; 166 167 bool authenticated = gap_authenticated(con_handle); 168 if (!authenticated) return LEVEL_2; 169 170 return encryption_key_size == 16 ? LEVEL_4 : LEVEL_3; 171 } 172 173 static gatt_client_t * gatt_client_get_context_for_handle(uint16_t handle){ 174 btstack_linked_item_t *it; 175 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 176 gatt_client_t * gatt_client = (gatt_client_t *) it; 177 if (gatt_client->con_handle == handle){ 178 return gatt_client; 179 } 180 } 181 return NULL; 182 } 183 184 185 // @return gatt_client context 186 // returns existing one, or tries to setup new one 187 static uint8_t gatt_client_provide_context_for_handle(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 188 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 189 190 if (gatt_client != NULL){ 191 *out_gatt_client = gatt_client; 192 return ERROR_CODE_SUCCESS; 193 } 194 195 // bail if no such hci connection 196 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 197 if (hci_connection == NULL){ 198 log_error("No connection for handle 0x%04x", con_handle); 199 *out_gatt_client = NULL; 200 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 201 } 202 203 gatt_client = btstack_memory_gatt_client_get(); 204 if (gatt_client == NULL){ 205 *out_gatt_client = NULL; 206 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 207 } 208 // init state 209 gatt_client->bearer_type = ATT_BEARER_UNENHANCED_LE; 210 gatt_client->con_handle = con_handle; 211 gatt_client->mtu = ATT_DEFAULT_MTU; 212 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 213 if (gatt_client_mtu_exchange_enabled){ 214 gatt_client->mtu_state = SEND_MTU_EXCHANGE; 215 } else { 216 gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 217 } 218 gatt_client->state = P_READY; 219 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_W2_SEND; 220 #ifdef ENABLE_GATT_OVER_EATT 221 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 222 #endif 223 btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); 224 225 // get unenhanced att bearer state 226 if (hci_connection->att_connection.mtu_exchanged){ 227 gatt_client->mtu = hci_connection->att_connection.mtu; 228 gatt_client->mtu_state = MTU_EXCHANGED; 229 } 230 *out_gatt_client = gatt_client; 231 return ERROR_CODE_SUCCESS; 232 } 233 234 static bool is_ready(gatt_client_t * gatt_client){ 235 return gatt_client->state == P_READY; 236 } 237 238 static uint8_t gatt_client_provide_context_for_request(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 239 gatt_client_t * gatt_client = NULL; 240 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 241 if (status != ERROR_CODE_SUCCESS){ 242 return status; 243 } 244 245 #ifdef ENABLE_GATT_OVER_EATT 246 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY){ 247 btstack_linked_list_iterator_t it; 248 gatt_client_t * eatt_client = NULL; 249 // find free eatt client 250 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 251 while (btstack_linked_list_iterator_has_next(&it)){ 252 gatt_client_t * client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 253 if (client->state == P_READY){ 254 eatt_client = client; 255 break; 256 } 257 } 258 if (eatt_client == NULL){ 259 return ERROR_CODE_COMMAND_DISALLOWED; 260 } 261 gatt_client = eatt_client; 262 } 263 #endif 264 265 if (is_ready(gatt_client) == false){ 266 return GATT_CLIENT_IN_WRONG_STATE; 267 } 268 269 gatt_client_timeout_start(gatt_client); 270 271 *out_gatt_client = gatt_client; 272 273 return status; 274 } 275 276 int gatt_client_is_ready(hci_con_handle_t con_handle){ 277 gatt_client_t * gatt_client; 278 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 279 if (status != ERROR_CODE_SUCCESS){ 280 return 0; 281 } 282 return is_ready(gatt_client) ? 1 : 0; 283 } 284 285 void gatt_client_mtu_enable_auto_negotiation(uint8_t enabled){ 286 gatt_client_mtu_exchange_enabled = enabled != 0; 287 } 288 289 uint8_t gatt_client_get_mtu(hci_con_handle_t con_handle, uint16_t * mtu){ 290 gatt_client_t * gatt_client; 291 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 292 if (status != ERROR_CODE_SUCCESS){ 293 return status; 294 } 295 296 if ((gatt_client->mtu_state == MTU_EXCHANGED) || (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED)){ 297 *mtu = gatt_client->mtu; 298 return ERROR_CODE_SUCCESS; 299 } 300 *mtu = ATT_DEFAULT_MTU; 301 return GATT_CLIENT_IN_WRONG_STATE; 302 } 303 304 static uint8_t *gatt_client_reserve_request_buffer(gatt_client_t *gatt_client) { 305 switch (gatt_client->bearer_type){ 306 #ifdef ENABLE_GATT_OVER_CLASSIC 307 case ATT_BEARER_UNENHANCED_CLASSIC: 308 #endif 309 case ATT_BEARER_UNENHANCED_LE: 310 l2cap_reserve_packet_buffer(); 311 return l2cap_get_outgoing_buffer(); 312 #ifdef ENABLE_GATT_OVER_EATT 313 case ATT_BEARER_ENHANCED_LE: 314 return gatt_client->eatt_storage_buffer; 315 #endif 316 default: 317 btstack_unreachable(); 318 break; 319 } 320 return NULL; 321 } 322 323 // precondition: can_send_packet_now == TRUE 324 static uint8_t gatt_client_send(gatt_client_t * gatt_client, uint16_t len){ 325 switch (gatt_client->bearer_type){ 326 case ATT_BEARER_UNENHANCED_LE: 327 return l2cap_send_prepared_connectionless(gatt_client->con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, len); 328 #ifdef ENABLE_GATT_OVER_CLASSIC 329 case ATT_BEARER_UNENHANCED_CLASSIC: 330 return l2cap_send_prepared(gatt_client->l2cap_cid, len); 331 #endif 332 #ifdef ENABLE_GATT_OVER_EATT 333 case ATT_BEARER_ENHANCED_LE: 334 return l2cap_send(gatt_client->l2cap_cid, gatt_client->eatt_storage_buffer, len); 335 #endif 336 default: 337 btstack_unreachable(); 338 return ERROR_CODE_HARDWARE_FAILURE; 339 } 340 } 341 342 // precondition: can_send_packet_now == TRUE 343 static uint8_t att_confirmation(gatt_client_t * gatt_client) { 344 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 345 346 request[0] = ATT_HANDLE_VALUE_CONFIRMATION; 347 348 return gatt_client_send(gatt_client, 1); 349 } 350 351 // precondition: can_send_packet_now == TRUE 352 static uint8_t att_find_information_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t start_handle, 353 uint16_t end_handle) { 354 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 355 356 request[0] = request_type; 357 little_endian_store_16(request, 1, start_handle); 358 little_endian_store_16(request, 3, end_handle); 359 360 return gatt_client_send(gatt_client, 5); 361 } 362 363 // precondition: can_send_packet_now == TRUE 364 static uint8_t 365 att_find_by_type_value_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_group_type, 366 uint16_t start_handle, uint16_t end_handle, uint8_t *value, uint16_t value_size) { 367 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 368 request[0] = request_type; 369 370 little_endian_store_16(request, 1, start_handle); 371 little_endian_store_16(request, 3, end_handle); 372 little_endian_store_16(request, 5, attribute_group_type); 373 (void)memcpy(&request[7], value, value_size); 374 375 return gatt_client_send(gatt_client, 7u + value_size); 376 } 377 378 // precondition: can_send_packet_now == TRUE 379 static uint8_t 380 att_read_by_type_or_group_request_for_uuid16(gatt_client_t *gatt_client, uint8_t request_type, uint16_t uuid16, 381 uint16_t start_handle, uint16_t end_handle) { 382 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 383 384 request[0] = request_type; 385 little_endian_store_16(request, 1, start_handle); 386 little_endian_store_16(request, 3, end_handle); 387 little_endian_store_16(request, 5, uuid16); 388 389 return gatt_client_send(gatt_client, 7); 390 } 391 392 // precondition: can_send_packet_now == TRUE 393 static uint8_t 394 att_read_by_type_or_group_request_for_uuid128(gatt_client_t *gatt_client, uint8_t request_type, const uint8_t *uuid128, 395 uint16_t start_handle, uint16_t end_handle) { 396 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 397 398 request[0] = request_type; 399 little_endian_store_16(request, 1, start_handle); 400 little_endian_store_16(request, 3, end_handle); 401 reverse_128(uuid128, &request[5]); 402 403 return gatt_client_send(gatt_client, 21); 404 } 405 406 // precondition: can_send_packet_now == TRUE 407 static uint8_t att_read_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle) { 408 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 409 410 request[0] = request_type; 411 little_endian_store_16(request, 1, attribute_handle); 412 413 return gatt_client_send(gatt_client, 3); 414 } 415 416 // precondition: can_send_packet_now == TRUE 417 static uint8_t att_read_blob_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, 418 uint16_t value_offset) { 419 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 420 421 request[0] = request_type; 422 little_endian_store_16(request, 1, attribute_handle); 423 little_endian_store_16(request, 3, value_offset); 424 425 return gatt_client_send(gatt_client, 5); 426 } 427 428 static uint8_t 429 att_read_multiple_request_with_opcode(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles, uint8_t opcode) { 430 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 431 432 request[0] = opcode; 433 uint16_t i; 434 uint16_t offset = 1; 435 for (i=0;i<num_value_handles;i++){ 436 little_endian_store_16(request, offset, value_handles[i]); 437 offset += 2; 438 } 439 440 return gatt_client_send(gatt_client, offset); 441 } 442 443 static uint8_t 444 att_read_multiple_request(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles) { 445 return att_read_multiple_request_with_opcode(gatt_client, num_value_handles, value_handles, ATT_READ_MULTIPLE_REQUEST); 446 } 447 448 #ifdef ENABLE_GATT_OVER_EATT 449 static uint8_t 450 att_read_multiple_variable_request(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles) { 451 return att_read_multiple_request_with_opcode(gatt_client, num_value_handles, value_handles, ATT_READ_MULTIPLE_VARIABLE_REQ); 452 } 453 #endif 454 455 #ifdef ENABLE_LE_SIGNED_WRITE 456 // precondition: can_send_packet_now == TRUE 457 static uint8_t att_signed_write_request(gatt_client_t *gatt_client, uint16_t request_type, uint16_t attribute_handle, 458 uint16_t value_length, uint8_t *value, uint32_t sign_counter, uint8_t sgn[8]) { 459 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 460 461 request[0] = request_type; 462 little_endian_store_16(request, 1, attribute_handle); 463 (void)memcpy(&request[3], value, value_length); 464 little_endian_store_32(request, 3 + value_length, sign_counter); 465 reverse_64(sgn, &request[3 + value_length + 4]); 466 467 return gatt_client_send(gatt_client, 3 + value_length + 12); 468 } 469 #endif 470 471 // precondition: can_send_packet_now == TRUE 472 static uint8_t 473 att_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, uint16_t value_length, 474 uint8_t *value) { 475 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 476 477 request[0] = request_type; 478 little_endian_store_16(request, 1, attribute_handle); 479 (void)memcpy(&request[3], value, value_length); 480 481 return gatt_client_send(gatt_client, 3u + value_length); 482 } 483 484 // precondition: can_send_packet_now == TRUE 485 static uint8_t att_execute_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint8_t execute_write) { 486 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 487 488 request[0] = request_type; 489 request[1] = execute_write; 490 491 return gatt_client_send(gatt_client, 2); 492 } 493 494 // precondition: can_send_packet_now == TRUE 495 static uint8_t att_prepare_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, 496 uint16_t value_offset, uint16_t blob_length, uint8_t *value) { 497 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 498 499 request[0] = request_type; 500 little_endian_store_16(request, 1, attribute_handle); 501 little_endian_store_16(request, 3, value_offset); 502 (void)memcpy(&request[5], &value[value_offset], blob_length); 503 504 return gatt_client_send(gatt_client, 5u + blob_length); 505 } 506 507 static uint8_t att_exchange_mtu_request(gatt_client_t *gatt_client) { 508 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 509 510 request[0] = ATT_EXCHANGE_MTU_REQUEST; 511 uint16_t mtu = l2cap_max_le_mtu(); 512 little_endian_store_16(request, 1, mtu); 513 514 return gatt_client_send(gatt_client, 3); 515 } 516 517 static uint16_t write_blob_length(gatt_client_t * gatt_client){ 518 uint16_t max_blob_length = gatt_client->mtu - 5u; 519 if (gatt_client->attribute_offset >= gatt_client->attribute_length) { 520 return 0; 521 } 522 uint16_t rest_length = gatt_client->attribute_length - gatt_client->attribute_offset; 523 if (max_blob_length > rest_length){ 524 return rest_length; 525 } 526 return max_blob_length; 527 } 528 529 static void send_gatt_services_request(gatt_client_t *gatt_client){ 530 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_GROUP_TYPE_REQUEST, 531 gatt_client->uuid16, gatt_client->start_group_handle, 532 gatt_client->end_group_handle); 533 } 534 535 static void send_gatt_by_uuid_request(gatt_client_t *gatt_client, uint16_t attribute_group_type){ 536 if (gatt_client->uuid16 != 0u){ 537 uint8_t uuid16[2]; 538 little_endian_store_16(uuid16, 0, gatt_client->uuid16); 539 att_find_by_type_value_request(gatt_client, ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, 540 gatt_client->start_group_handle, gatt_client->end_group_handle, uuid16, 2); 541 return; 542 } 543 uint8_t uuid128[16]; 544 reverse_128(gatt_client->uuid128, uuid128); 545 att_find_by_type_value_request(gatt_client, ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, 546 gatt_client->start_group_handle, gatt_client->end_group_handle, uuid128, 16); 547 } 548 549 static void send_gatt_services_by_uuid_request(gatt_client_t *gatt_client){ 550 send_gatt_by_uuid_request(gatt_client, GATT_PRIMARY_SERVICE_UUID); 551 } 552 553 static void send_gatt_included_service_uuid_request(gatt_client_t *gatt_client){ 554 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->query_start_handle); 555 } 556 557 static void send_gatt_included_service_request(gatt_client_t *gatt_client){ 558 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 559 GATT_INCLUDE_SERVICE_UUID, gatt_client->start_group_handle, 560 gatt_client->end_group_handle); 561 } 562 563 static void send_gatt_characteristic_request(gatt_client_t *gatt_client){ 564 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 565 GATT_CHARACTERISTICS_UUID, gatt_client->start_group_handle, 566 gatt_client->end_group_handle); 567 } 568 569 static void send_gatt_characteristic_descriptor_request(gatt_client_t *gatt_client){ 570 att_find_information_request(gatt_client, ATT_FIND_INFORMATION_REQUEST, gatt_client->start_group_handle, 571 gatt_client->end_group_handle); 572 } 573 574 static void send_gatt_read_characteristic_value_request(gatt_client_t *gatt_client){ 575 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 576 } 577 578 static void send_gatt_read_by_type_request(gatt_client_t * gatt_client){ 579 if (gatt_client->uuid16 != 0u){ 580 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 581 gatt_client->uuid16, gatt_client->start_group_handle, 582 gatt_client->end_group_handle); 583 } else { 584 att_read_by_type_or_group_request_for_uuid128(gatt_client, ATT_READ_BY_TYPE_REQUEST, 585 gatt_client->uuid128, gatt_client->start_group_handle, 586 gatt_client->end_group_handle); 587 } 588 } 589 590 static void send_gatt_read_blob_request(gatt_client_t *gatt_client){ 591 if (gatt_client->attribute_offset == 0){ 592 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 593 } else { 594 att_read_blob_request(gatt_client, ATT_READ_BLOB_REQUEST, gatt_client->attribute_handle, 595 gatt_client->attribute_offset); 596 } 597 } 598 599 static void send_gatt_read_multiple_request(gatt_client_t * gatt_client){ 600 att_read_multiple_request(gatt_client, gatt_client->read_multiple_handle_count, gatt_client->read_multiple_handles); 601 } 602 603 #ifdef ENABLE_GATT_OVER_EATT 604 static void send_gatt_read_multiple_variable_request(gatt_client_t * gatt_client){ 605 att_read_multiple_variable_request(gatt_client, gatt_client->read_multiple_handle_count, gatt_client->read_multiple_handles); 606 } 607 #endif 608 609 static void send_gatt_write_attribute_value_request(gatt_client_t * gatt_client){ 610 att_write_request(gatt_client, ATT_WRITE_REQUEST, gatt_client->attribute_handle, gatt_client->attribute_length, 611 gatt_client->attribute_value); 612 } 613 614 static void send_gatt_write_client_characteristic_configuration_request(gatt_client_t * gatt_client){ 615 att_write_request(gatt_client, ATT_WRITE_REQUEST, gatt_client->client_characteristic_configuration_handle, 2, 616 gatt_client->client_characteristic_configuration_value); 617 } 618 619 static void send_gatt_prepare_write_request(gatt_client_t * gatt_client){ 620 att_prepare_write_request(gatt_client, ATT_PREPARE_WRITE_REQUEST, gatt_client->attribute_handle, 621 gatt_client->attribute_offset, write_blob_length(gatt_client), 622 gatt_client->attribute_value); 623 } 624 625 static void send_gatt_execute_write_request(gatt_client_t * gatt_client){ 626 att_execute_write_request(gatt_client, ATT_EXECUTE_WRITE_REQUEST, 1); 627 } 628 629 static void send_gatt_cancel_prepared_write_request(gatt_client_t * gatt_client){ 630 att_execute_write_request(gatt_client, ATT_EXECUTE_WRITE_REQUEST, 0); 631 } 632 633 #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 634 static void send_gatt_read_client_characteristic_configuration_request(gatt_client_t * gatt_client){ 635 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 636 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION, 637 gatt_client->start_group_handle, gatt_client->end_group_handle); 638 } 639 #endif 640 641 static void send_gatt_read_characteristic_descriptor_request(gatt_client_t * gatt_client){ 642 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 643 } 644 645 #ifdef ENABLE_LE_SIGNED_WRITE 646 static void send_gatt_signed_write_request(gatt_client_t * gatt_client, uint32_t sign_counter){ 647 att_signed_write_request(gatt_client, ATT_SIGNED_WRITE_COMMAND, gatt_client->attribute_handle, 648 gatt_client->attribute_length, gatt_client->attribute_value, sign_counter, 649 gatt_client->cmac); 650 } 651 #endif 652 653 static uint16_t get_last_result_handle_from_service_list(uint8_t * packet, uint16_t size){ 654 if (size < 2) return 0xffff; 655 uint8_t attr_length = packet[1]; 656 if ((2 + attr_length) > size) return 0xffff; 657 return little_endian_read_16(packet, size - attr_length + 2u); 658 } 659 660 static uint16_t get_last_result_handle_from_characteristics_list(uint8_t * packet, uint16_t size){ 661 if (size < 2) return 0xffff; 662 uint8_t attr_length = packet[1]; 663 if ((2 + attr_length) > size) return 0xffff; 664 return little_endian_read_16(packet, size - attr_length + 3u); 665 } 666 667 static uint16_t get_last_result_handle_from_included_services_list(uint8_t * packet, uint16_t size){ 668 if (size < 2) return 0xffff; 669 uint8_t attr_length = packet[1]; 670 if ((2 + attr_length) > size) return 0xffff; 671 return little_endian_read_16(packet, size - attr_length); 672 } 673 674 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 675 static void gatt_client_service_emit_event(gatt_client_t * gatt_client, uint8_t * event, uint16_t size){ 676 btstack_linked_list_iterator_t it; 677 btstack_linked_list_iterator_init(&it, &gatt_client_service_changed_handler); 678 while (btstack_linked_list_iterator_has_next(&it)) { 679 btstack_packet_callback_registration_t *callback = (btstack_packet_callback_registration_t *) btstack_linked_list_iterator_next(&it); 680 (*callback->callback)(HCI_EVENT_PACKET, (uint16_t) gatt_client->con_handle, event, size); 681 } 682 } 683 684 static void 685 gatt_client_service_emit_database_hash(gatt_client_t *gatt_client, const uint8_t *value, uint16_t value_len) { 686 if (value_len == 16){ 687 uint8_t event[21]; 688 hci_event_builder_context_t context; 689 hci_event_builder_init(&context, event, sizeof(event), HCI_EVENT_GATTSERVICE_META, GATTSERVICE_SUBEVENT_GATT_DATABASE_HASH); 690 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 691 hci_event_builder_add_bytes(&context, value, 16); 692 gatt_client_service_emit_event(gatt_client, event, hci_event_builder_get_length(&context)); 693 } 694 } 695 696 static void 697 gatt_client_service_emit_service_changed(gatt_client_t *gatt_client, const uint8_t *value, uint16_t value_len) { 698 if (value_len == 4){ 699 uint8_t event[9]; 700 hci_event_builder_context_t context; 701 hci_event_builder_init(&context, event, sizeof(event), HCI_EVENT_GATTSERVICE_META, GATTSERVICE_SUBEVENT_GATT_SERVICE_CHANGED); 702 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 703 hci_event_builder_add_bytes(&context, value, 4); 704 gatt_client_service_emit_event(gatt_client, event, hci_event_builder_get_length(&context)); 705 } 706 } 707 708 static void gatt_client_service_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 709 UNUSED(channel); // ok: handling own l2cap events 710 UNUSED(size); // ok: there is no channel 711 712 hci_con_handle_t con_handle; 713 gatt_client_t *gatt_client; 714 gatt_client_service_t service; 715 gatt_client_characteristic_t characteristic; 716 switch (packet_type) { 717 case HCI_EVENT_PACKET: 718 switch (hci_event_packet_get_type(packet)) { 719 case GATT_EVENT_SERVICE_QUERY_RESULT: 720 con_handle = gatt_event_service_query_result_get_handle(packet); 721 gatt_client = gatt_client_get_context_for_handle(con_handle); 722 btstack_assert(gatt_client != NULL); 723 btstack_assert(gatt_client->gatt_service_state == GATT_CLIENT_SERVICE_DISCOVER_W4_DONE); 724 gatt_event_service_query_result_get_service(packet, &service); 725 gatt_client->gatt_service_start_group_handle = service.start_group_handle; 726 gatt_client->gatt_service_end_group_handle = service.end_group_handle; 727 break; 728 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 729 con_handle = gatt_event_characteristic_query_result_get_handle(packet); 730 gatt_client = gatt_client_get_context_for_handle(con_handle); 731 btstack_assert(gatt_client != NULL); 732 btstack_assert(gatt_client->gatt_service_state == GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W4_DONE); 733 gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic); 734 switch (characteristic.uuid16){ 735 case ORG_BLUETOOTH_CHARACTERISTIC_GATT_SERVICE_CHANGED: 736 gatt_client->gatt_service_changed_value_handle = characteristic.value_handle; 737 gatt_client->gatt_service_changed_end_handle = characteristic.end_handle; 738 break; 739 case ORG_BLUETOOTH_CHARACTERISTIC_DATABASE_HASH: 740 gatt_client->gatt_service_database_hash_value_handle = characteristic.value_handle; 741 gatt_client->gatt_service_database_hash_end_handle = characteristic.end_handle; 742 break; 743 default: 744 break; 745 } 746 break; 747 case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: 748 con_handle = gatt_event_characteristic_value_query_result_get_handle(packet); 749 gatt_client = gatt_client_get_context_for_handle(con_handle); 750 btstack_assert(gatt_client != NULL); 751 btstack_assert(gatt_client->gatt_service_state == GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W4_DONE); 752 gatt_client_service_emit_database_hash(gatt_client, 753 gatt_event_characteristic_value_query_result_get_value(packet), 754 gatt_event_characteristic_value_query_result_get_value_length(packet)); 755 break; 756 case GATT_EVENT_QUERY_COMPLETE: 757 con_handle = gatt_event_query_complete_get_handle(packet); 758 gatt_client = gatt_client_get_context_for_handle(con_handle); 759 btstack_assert(gatt_client != NULL); 760 switch (gatt_client->gatt_service_state) { 761 case GATT_CLIENT_SERVICE_DISCOVER_W4_DONE: 762 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W2_SEND; 763 break; 764 case GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W4_DONE: 765 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W2_SEND; 766 break; 767 case GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W4_DONE: 768 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W2_SEND; 769 break; 770 case GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W4_DONE: 771 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W2_SEND; 772 break; 773 case GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W4_DONE: 774 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DONE; 775 break; 776 default: 777 btstack_unreachable(); 778 break; 779 } 780 break; 781 default: 782 break; 783 } 784 break; 785 default: 786 break; 787 } 788 } 789 #endif 790 791 static void gatt_client_notify_can_send_query(gatt_client_t * gatt_client){ 792 793 #ifdef ENABLE_GATT_OVER_EATT 794 // if eatt is ready, notify all clients that can send a query 795 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY){ 796 btstack_linked_list_iterator_t it; 797 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 798 while (btstack_linked_list_iterator_has_next(&it)){ 799 gatt_client_t * client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 800 if (client->state == P_READY){ 801 // call callback 802 btstack_context_callback_registration_t * callback = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->query_requests); 803 if (callback == NULL) { 804 return; 805 } 806 (*callback->callback)(callback->context); 807 } 808 } 809 return; 810 } 811 #endif 812 813 while (gatt_client->state == P_READY){ 814 bool query_sent = false; 815 UNUSED(query_sent); 816 817 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 818 uint8_t status = ERROR_CODE_SUCCESS; 819 gatt_client_service_t gatt_service; 820 gatt_client_characteristic_t characteristic; 821 switch (gatt_client->gatt_service_state){ 822 case GATT_CLIENT_SERVICE_DISCOVER_W2_SEND: 823 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_W4_DONE; 824 status = gatt_client_discover_primary_services_by_uuid16(&gatt_client_service_packet_handler, 825 gatt_client->con_handle, 826 ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 827 query_sent = true; 828 break; 829 case GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W2_SEND: 830 if (gatt_client->gatt_service_start_group_handle != 0){ 831 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W4_DONE; 832 gatt_service.start_group_handle = gatt_client->gatt_service_start_group_handle; 833 gatt_service.end_group_handle = gatt_client->gatt_service_end_group_handle; 834 status = gatt_client_discover_characteristics_for_service(&gatt_client_service_packet_handler, gatt_client->con_handle, &gatt_service); 835 query_sent = true; 836 break; 837 } 838 839 /* fall through */ 840 841 case GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W2_SEND: 842 if (gatt_client->gatt_service_changed_value_handle != 0){ 843 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W4_DONE; 844 characteristic.value_handle = gatt_client->gatt_service_changed_value_handle; 845 characteristic.end_handle = gatt_client->gatt_service_changed_end_handle; 846 // we assume good case. We cannot do much otherwise 847 characteristic.properties = ATT_PROPERTY_INDICATE; 848 status = gatt_client_write_client_characteristic_configuration(&gatt_client_service_packet_handler, 849 gatt_client->con_handle, &characteristic, 850 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION); 851 query_sent = true; 852 break; 853 } 854 855 /* fall through */ 856 857 case GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W2_SEND: 858 if (gatt_client->gatt_service_database_hash_value_handle != 0){ 859 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W4_DONE; 860 status = gatt_client_read_value_of_characteristics_by_uuid16(&gatt_client_service_packet_handler, 861 gatt_client->con_handle, 862 0x0001, 0xffff, ORG_BLUETOOTH_CHARACTERISTIC_DATABASE_HASH); 863 query_sent = true; 864 break; 865 } 866 867 /* fall through */ 868 869 case GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W2_SEND: 870 if (gatt_client->gatt_service_database_hash_value_handle != 0) { 871 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W4_DONE; 872 characteristic.value_handle = gatt_client->gatt_service_database_hash_value_handle; 873 characteristic.end_handle = gatt_client->gatt_service_database_hash_end_handle; 874 // we assume good case. We cannot do much otherwise 875 characteristic.properties = ATT_PROPERTY_INDICATE; 876 status = gatt_client_write_client_characteristic_configuration(&gatt_client_service_packet_handler, 877 gatt_client->con_handle, 878 &characteristic, 879 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION); 880 query_sent = true; 881 break; 882 } 883 884 // DONE 885 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DONE; 886 break; 887 default: 888 break; 889 } 890 btstack_assert(status == ERROR_CODE_SUCCESS); 891 UNUSED(status); 892 if (query_sent){ 893 continue; 894 } 895 #endif 896 897 #ifdef ENABLE_GATT_OVER_EATT 898 query_sent = gatt_client_le_enhanced_handle_can_send_query(gatt_client); 899 if (query_sent){ 900 continue; 901 } 902 #endif 903 btstack_context_callback_registration_t * callback = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->query_requests); 904 if (callback == NULL) { 905 return; 906 } 907 (*callback->callback)(callback->context); 908 } 909 } 910 911 // test if notification/indication should be delivered to application (BLESA) 912 static bool gatt_client_accept_server_message(gatt_client_t *gatt_client) { 913 // ignore messages until re-encryption is complete 914 if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return false; 915 916 // after that ignore if bonded but not encrypted 917 return !gap_bonded(gatt_client->con_handle) || (gap_encryption_key_size(gatt_client->con_handle) > 0); 918 } 919 920 static void emit_event_new(btstack_packet_handler_t callback, uint8_t * packet, uint16_t size){ 921 if (!callback) return; 922 hci_dump_btstack_event(packet, size); 923 (*callback)(HCI_EVENT_PACKET, 0, packet, size); 924 } 925 926 static void emit_event_to_registered_listeners(hci_con_handle_t con_handle, uint16_t attribute_handle, uint8_t * packet, uint16_t size){ 927 btstack_linked_list_iterator_t it; 928 btstack_linked_list_iterator_init(&it, &gatt_client_value_listeners); 929 while (btstack_linked_list_iterator_has_next(&it)){ 930 gatt_client_notification_t * notification = (gatt_client_notification_t*) btstack_linked_list_iterator_next(&it); 931 if ((notification->con_handle != GATT_CLIENT_ANY_CONNECTION) && (notification->con_handle != con_handle)) continue; 932 if ((notification->attribute_handle != GATT_CLIENT_ANY_VALUE_HANDLE) && (notification->attribute_handle != attribute_handle)) continue; 933 (*notification->callback)(HCI_EVENT_PACKET, 0, packet, size); 934 } 935 } 936 937 static void emit_gatt_complete_event(gatt_client_t * gatt_client, uint8_t att_status){ 938 // @format H122 939 uint8_t packet[9]; 940 hci_event_builder_context_t context; 941 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_QUERY_COMPLETE, 0); 942 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 943 hci_event_builder_add_16(&context, gatt_client->service_id); 944 hci_event_builder_add_16(&context, gatt_client->connection_id); 945 hci_event_builder_add_08(&context, att_status); 946 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 947 } 948 949 static void emit_gatt_service_query_result_event(gatt_client_t * gatt_client, uint16_t start_group_handle, uint16_t end_group_handle, const uint8_t * uuid128){ 950 // @format H22X 951 uint8_t packet[28]; 952 hci_event_builder_context_t context; 953 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_SERVICE_QUERY_RESULT, 0); 954 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 955 hci_event_builder_add_16(&context, gatt_client->service_id); 956 hci_event_builder_add_16(&context, gatt_client->connection_id); 957 hci_event_builder_add_16(&context, start_group_handle); 958 hci_event_builder_add_16(&context, end_group_handle); 959 hci_event_builder_add_128(&context, uuid128); 960 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 961 } 962 963 static void emit_gatt_included_service_query_result_event(gatt_client_t * gatt_client, uint16_t include_handle, uint16_t start_group_handle, uint16_t end_group_handle, const uint8_t * uuid128){ 964 // @format HX 965 uint8_t packet[26]; 966 hci_event_builder_context_t context; 967 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_INCLUDED_SERVICE_QUERY_RESULT, 0); 968 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 969 hci_event_builder_add_16(&context, include_handle); 970 hci_event_builder_add_16(&context, start_group_handle); 971 hci_event_builder_add_16(&context, end_group_handle); 972 hci_event_builder_add_128(&context, uuid128); 973 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 974 } 975 976 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, 977 uint16_t properties, const uint8_t * uuid128){ 978 // @format H22Y 979 uint8_t packet[32]; 980 hci_event_builder_context_t context; 981 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_CHARACTERISTIC_QUERY_RESULT, 0); 982 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 983 hci_event_builder_add_16(&context, gatt_client->service_id); 984 hci_event_builder_add_16(&context, gatt_client->connection_id); 985 hci_event_builder_add_16(&context, start_handle); 986 hci_event_builder_add_16(&context, value_handle); 987 hci_event_builder_add_16(&context, end_handle); 988 hci_event_builder_add_16(&context, properties); 989 hci_event_builder_add_128(&context, uuid128); 990 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 991 } 992 993 static void emit_gatt_all_characteristic_descriptors_result_event( 994 gatt_client_t * gatt_client, uint16_t descriptor_handle, const uint8_t * uuid128){ 995 // @format H22Z 996 uint8_t packet[26]; 997 hci_event_builder_context_t context; 998 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT, 0); 999 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 1000 hci_event_builder_add_16(&context, gatt_client->service_id); 1001 hci_event_builder_add_16(&context, gatt_client->connection_id); 1002 hci_event_builder_add_16(&context, descriptor_handle); 1003 hci_event_builder_add_128(&context, uuid128); 1004 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 1005 } 1006 1007 static void emit_gatt_mtu_exchanged_result_event(gatt_client_t * gatt_client, uint16_t new_mtu){ 1008 // @format H2 1009 uint8_t packet[6]; 1010 packet[0] = GATT_EVENT_MTU; 1011 packet[1] = sizeof(packet) - 2u; 1012 little_endian_store_16(packet, 2, gatt_client->con_handle); 1013 little_endian_store_16(packet, 4, new_mtu); 1014 att_dispatch_client_mtu_exchanged(gatt_client->con_handle, new_mtu); 1015 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 1016 } 1017 1018 // helper 1019 static void gatt_client_handle_transaction_complete(gatt_client_t *gatt_client, uint8_t att_status) { 1020 gatt_client->state = P_READY; 1021 gatt_client_timeout_stop(gatt_client); 1022 emit_gatt_complete_event(gatt_client, att_status); 1023 gatt_client_notify_can_send_query(gatt_client); 1024 } 1025 1026 // @return packet pointer 1027 // @note assume that value is part of an l2cap buffer - overwrite HCI + L2CAP packet headers 1028 #define CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 8 1029 static uint8_t * 1030 setup_characteristic_value_packet(const gatt_client_t *gatt_client, uint8_t type, uint16_t attribute_handle, 1031 uint8_t *value, uint16_t length) { 1032 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 1033 // copy value into test packet for testing 1034 static uint8_t packet[1000]; 1035 memcpy(&packet[CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE], value, length); 1036 #else 1037 // before the value inside the ATT PDU 1038 uint8_t * packet = value - CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE; 1039 #endif 1040 packet[0] = type; 1041 packet[1] = CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 2 + length; 1042 little_endian_store_16(packet, 2, gatt_client->con_handle); 1043 little_endian_store_16(packet, 4, attribute_handle); 1044 little_endian_store_16(packet, 6, length); 1045 return packet; 1046 } 1047 1048 // @return packet pointer 1049 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1050 #define LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 10 1051 1052 // L2CAP Header (4) + ACL Header (4) => 8 bytes 1053 #if !defined(HCI_INCOMING_PRE_BUFFER_SIZE) || ((HCI_INCOMING_PRE_BUFFER_SIZE < LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 8)) 1054 #error "Long Characteristic reads requires HCI_INCOMING_PRE_BUFFER_SIZE >= 2" 1055 #endif 1056 1057 static uint8_t * 1058 setup_long_characteristic_value_packet(const gatt_client_t *gatt_client, uint8_t type, uint16_t attribute_handle, 1059 uint16_t offset, uint8_t *value, uint16_t length) { 1060 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 1061 // avoid using pre ATT headers. 1062 // copy value into test packet for testing 1063 static uint8_t packet[1000]; 1064 memcpy(&packet[LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE], value, length); 1065 #else 1066 // before the value inside the ATT PDU 1067 uint8_t * packet = value - LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE; 1068 #endif 1069 packet[0] = type; 1070 packet[1] = LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 2 + length; 1071 little_endian_store_16(packet, 2, gatt_client->con_handle); 1072 little_endian_store_16(packet, 4, attribute_handle); 1073 little_endian_store_16(packet, 6, offset); 1074 little_endian_store_16(packet, 8, length); 1075 return packet; 1076 } 1077 1078 #if (LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE > CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE) 1079 #define REPORT_PREBUFFER_HEADER LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 1080 #else 1081 #define REPORT_PREBUFFER_HEADER CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 1082 #endif 1083 1084 /// 1085 static void report_gatt_services(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 1086 if (size < 2) return; 1087 uint8_t attr_length = packet[1]; 1088 uint8_t uuid_length = attr_length - 4u; 1089 1090 int i; 1091 for (i = 2; (i+attr_length) <= size; i += attr_length){ 1092 uint16_t start_group_handle = little_endian_read_16(packet,i); 1093 uint16_t end_group_handle = little_endian_read_16(packet,i+2); 1094 uint8_t uuid128[16]; 1095 uint16_t uuid16 = 0; 1096 1097 if (uuid_length == 2u){ 1098 uuid16 = little_endian_read_16(packet, i+4); 1099 uuid_add_bluetooth_prefix((uint8_t*) &uuid128, uuid16); 1100 } else if (uuid_length == 16u) { 1101 reverse_128(&packet[i+4], uuid128); 1102 } else { 1103 return; 1104 } 1105 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, uuid128); 1106 } 1107 } 1108 1109 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){ 1110 uint8_t uuid128[16]; 1111 uint16_t uuid16 = 0; 1112 if (uuid_length == 2u){ 1113 uuid16 = little_endian_read_16(uuid, 0); 1114 uuid_add_bluetooth_prefix((uint8_t*) uuid128, uuid16); 1115 } else if (uuid_length == 16u){ 1116 reverse_128(uuid, uuid128); 1117 } else { 1118 return; 1119 } 1120 1121 if (gatt_client->filter_with_uuid && (memcmp(gatt_client->uuid128, uuid128, 16) != 0)) return; 1122 1123 gatt_client->characteristic_properties = properties; 1124 gatt_client->characteristic_start_handle = start_handle; 1125 gatt_client->attribute_handle = value_handle; 1126 1127 if (gatt_client->filter_with_uuid) return; 1128 1129 gatt_client->uuid16 = uuid16; 1130 (void)memcpy(gatt_client->uuid128, uuid128, 16); 1131 } 1132 1133 static void report_gatt_characteristic_end_found(gatt_client_t * gatt_client, uint16_t end_handle){ 1134 // TODO: stop searching if filter and uuid found 1135 1136 if (!gatt_client->characteristic_start_handle) return; 1137 1138 emit_gatt_characteristic_query_result_event(gatt_client, gatt_client->characteristic_start_handle, gatt_client->attribute_handle, 1139 end_handle, gatt_client->characteristic_properties, gatt_client->uuid128); 1140 1141 gatt_client->characteristic_start_handle = 0; 1142 } 1143 1144 1145 static void report_gatt_characteristics(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 1146 if (size < 2u) return; 1147 uint8_t attr_length = packet[1]; 1148 if ((attr_length != 7u) && (attr_length != 21u)) return; 1149 uint8_t uuid_length = attr_length - 5u; 1150 int i; 1151 for (i = 2u; (i + attr_length) <= size; i += attr_length){ 1152 uint16_t start_handle = little_endian_read_16(packet, i); 1153 uint8_t properties = packet[i+2]; 1154 uint16_t value_handle = little_endian_read_16(packet, i+3); 1155 report_gatt_characteristic_end_found(gatt_client, start_handle - 1u); 1156 report_gatt_characteristic_start_found(gatt_client, start_handle, properties, value_handle, &packet[i + 5], 1157 uuid_length); 1158 } 1159 } 1160 1161 static void report_gatt_included_service_uuid16(gatt_client_t * gatt_client, uint16_t include_handle, uint16_t uuid16){ 1162 uint8_t normalized_uuid128[16]; 1163 uuid_add_bluetooth_prefix(normalized_uuid128, uuid16); 1164 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 1165 gatt_client->query_end_handle, normalized_uuid128); 1166 } 1167 1168 static void report_gatt_included_service_uuid128(gatt_client_t * gatt_client, uint16_t include_handle, const uint8_t * uuid128){ 1169 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 1170 gatt_client->query_end_handle, uuid128); 1171 } 1172 1173 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1174 static void report_gatt_notification(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { 1175 if (!gatt_client_accept_server_message(gatt_client)) return; 1176 uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_NOTIFICATION, value_handle, 1177 value, length); 1178 emit_event_to_registered_listeners(gatt_client->con_handle, value_handle, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 1179 } 1180 1181 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1182 static void report_gatt_indication(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { 1183 if (!gatt_client_accept_server_message(gatt_client)) return; 1184 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 1185 // Directly Handle GATT Service Changed and Database Hash indications 1186 if (value_handle == gatt_client->gatt_service_database_hash_value_handle){ 1187 gatt_client_service_emit_database_hash(gatt_client, value, length); 1188 } 1189 if (value_handle == gatt_client->gatt_service_changed_value_handle){ 1190 gatt_client_service_emit_service_changed(gatt_client, value, length); 1191 } 1192 #endif 1193 uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_INDICATION, value_handle, 1194 value, length); 1195 emit_event_to_registered_listeners(gatt_client->con_handle, value_handle, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 1196 } 1197 1198 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1199 static void report_gatt_characteristic_value(gatt_client_t * gatt_client, uint16_t attribute_handle, uint8_t * value, uint16_t length){ 1200 uint8_t * packet = setup_characteristic_value_packet( 1201 gatt_client, GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT, attribute_handle, value, length); 1202 emit_event_new(gatt_client->callback, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 1203 } 1204 1205 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1206 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){ 1207 uint8_t * packet = setup_long_characteristic_value_packet(gatt_client, 1208 GATT_EVENT_LONG_CHARACTERISTIC_VALUE_QUERY_RESULT, 1209 attribute_handle, value_offset, 1210 blob, blob_length); 1211 emit_event_new(gatt_client->callback, packet, blob_length + LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE); 1212 } 1213 1214 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){ 1215 UNUSED(value_offset); 1216 uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, 1217 descriptor_handle, value, 1218 value_length); 1219 emit_event_new(gatt_client->callback, packet, value_length + 8u); 1220 } 1221 1222 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){ 1223 uint8_t * packet = setup_long_characteristic_value_packet(gatt_client, 1224 GATT_EVENT_LONG_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, 1225 descriptor_handle, value_offset, 1226 blob, blob_length); 1227 emit_event_new(gatt_client->callback, packet, blob_length + LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE); 1228 } 1229 1230 static void report_gatt_all_characteristic_descriptors(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size, uint16_t pair_size){ 1231 int i; 1232 for (i = 0u; (i + pair_size) <= size; i += pair_size){ 1233 uint16_t descriptor_handle = little_endian_read_16(packet,i); 1234 uint8_t uuid128[16]; 1235 uint16_t uuid16 = 0; 1236 if (pair_size == 4u){ 1237 uuid16 = little_endian_read_16(packet,i+2); 1238 uuid_add_bluetooth_prefix(uuid128, uuid16); 1239 } else { 1240 reverse_128(&packet[i+2], uuid128); 1241 } 1242 emit_gatt_all_characteristic_descriptors_result_event(gatt_client, descriptor_handle, uuid128); 1243 } 1244 1245 } 1246 1247 static bool is_query_done(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1248 return last_result_handle >= gatt_client->end_group_handle; 1249 } 1250 1251 static void trigger_next_query(gatt_client_t * gatt_client, uint16_t last_result_handle, gatt_client_state_t next_query_state){ 1252 if (is_query_done(gatt_client, last_result_handle)){ 1253 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1254 return; 1255 } 1256 // next 1257 gatt_client->start_group_handle = last_result_handle + 1u; 1258 gatt_client->state = next_query_state; 1259 } 1260 1261 static void trigger_next_included_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1262 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_INCLUDED_SERVICE_QUERY); 1263 } 1264 1265 static void trigger_next_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1266 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_QUERY); 1267 } 1268 1269 static void trigger_next_service_by_uuid_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1270 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_WITH_UUID_QUERY); 1271 } 1272 1273 static void trigger_next_characteristic_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1274 if (is_query_done(gatt_client, last_result_handle)){ 1275 // report last characteristic 1276 report_gatt_characteristic_end_found(gatt_client, gatt_client->end_group_handle); 1277 } 1278 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY); 1279 } 1280 1281 static void trigger_next_characteristic_descriptor_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1282 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY); 1283 } 1284 1285 static void trigger_next_read_by_type_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1286 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_READ_BY_TYPE_REQUEST); 1287 } 1288 1289 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){ 1290 gatt_client->attribute_offset += write_blob_length(gatt_client); 1291 uint16_t next_blob_length = write_blob_length(gatt_client); 1292 1293 if (next_blob_length == 0u){ 1294 gatt_client->state = done_state; 1295 return; 1296 } 1297 gatt_client->state = next_query_state; 1298 } 1299 1300 static void trigger_next_blob_query(gatt_client_t * gatt_client, gatt_client_state_t next_query_state, uint16_t received_blob_length){ 1301 1302 uint16_t max_blob_length = gatt_client->mtu - 1u; 1303 if (received_blob_length < max_blob_length){ 1304 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1305 return; 1306 } 1307 1308 gatt_client->attribute_offset += received_blob_length; 1309 gatt_client->state = next_query_state; 1310 } 1311 1312 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){ 1313 notification->callback = callback; 1314 notification->con_handle = con_handle; 1315 if (characteristic == NULL){ 1316 notification->attribute_handle = GATT_CLIENT_ANY_VALUE_HANDLE; 1317 } else { 1318 notification->attribute_handle = characteristic->value_handle; 1319 } 1320 btstack_linked_list_add(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 1321 } 1322 1323 void gatt_client_stop_listening_for_characteristic_value_updates(gatt_client_notification_t * notification){ 1324 btstack_linked_list_remove(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 1325 } 1326 1327 static bool is_value_valid(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size){ 1328 uint16_t attribute_handle = little_endian_read_16(packet, 1); 1329 uint16_t value_offset = little_endian_read_16(packet, 3); 1330 1331 if (gatt_client->attribute_handle != attribute_handle) return false; 1332 if (gatt_client->attribute_offset != value_offset) return false; 1333 return memcmp(&gatt_client->attribute_value[gatt_client->attribute_offset], &packet[5], size - 5u) == 0u; 1334 } 1335 1336 #ifdef ENABLE_LE_SIGNED_WRITE 1337 static void gatt_client_run_for_client_start_signed_write(gatt_client_t *gatt_client) { 1338 sm_key_t csrk; 1339 le_device_db_local_csrk_get(gatt_client->le_device_index, csrk); 1340 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 1341 gatt_client->state = P_W4_CMAC_RESULT; 1342 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); 1343 } 1344 #endif 1345 1346 // returns true if packet was sent 1347 static bool gatt_client_run_for_gatt_client(gatt_client_t * gatt_client){ 1348 1349 // wait until re-encryption is complete 1350 if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return false; 1351 1352 // wait until re-encryption is complete 1353 if (gatt_client->reencryption_active) return false; 1354 1355 // wait until pairing complete (either reactive authentication or due to required security level) 1356 if (gatt_client->wait_for_authentication_complete) return false; 1357 1358 bool client_request_pending = gatt_client->state != P_READY; 1359 1360 // verify security level for Mandatory Authentication over LE 1361 bool check_security; 1362 switch (gatt_client->bearer_type){ 1363 case ATT_BEARER_UNENHANCED_LE: 1364 check_security = true; 1365 break; 1366 default: 1367 check_security = false; 1368 break; 1369 } 1370 if (client_request_pending && (gatt_client_required_security_level > gatt_client->security_level) && check_security){ 1371 log_info("Trigger pairing, current security level %u, required %u\n", gatt_client->security_level, gatt_client_required_security_level); 1372 gatt_client->wait_for_authentication_complete = true; 1373 // set att error code for pairing failure based on required level 1374 switch (gatt_client_required_security_level){ 1375 case LEVEL_4: 1376 case LEVEL_3: 1377 gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_AUTHENTICATION; 1378 break; 1379 default: 1380 gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_ENCRYPTION; 1381 break; 1382 } 1383 sm_request_pairing(gatt_client->con_handle); 1384 // sm probably just sent a pdu 1385 return true; 1386 } 1387 1388 switch (gatt_client->mtu_state) { 1389 case SEND_MTU_EXCHANGE: 1390 gatt_client->mtu_state = SENT_MTU_EXCHANGE; 1391 att_exchange_mtu_request(gatt_client); 1392 return true; 1393 case SENT_MTU_EXCHANGE: 1394 return false; 1395 default: 1396 break; 1397 } 1398 1399 if (gatt_client->send_confirmation){ 1400 gatt_client->send_confirmation = false; 1401 att_confirmation(gatt_client); 1402 return true; 1403 } 1404 1405 // check MTU for writes 1406 switch (gatt_client->state){ 1407 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 1408 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 1409 if (gatt_client->attribute_length <= (gatt_client->mtu - 3u)) break; 1410 log_error("gatt_client_run: value len %u > MTU %u - 3\n", gatt_client->attribute_length,gatt_client->mtu); 1411 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH); 1412 return false; 1413 default: 1414 break; 1415 } 1416 1417 bool packet_sent = true; 1418 bool done = true; 1419 switch (gatt_client->state){ 1420 case P_W2_SEND_SERVICE_QUERY: 1421 gatt_client->state = P_W4_SERVICE_QUERY_RESULT; 1422 send_gatt_services_request(gatt_client); 1423 break; 1424 1425 case P_W2_SEND_SERVICE_WITH_UUID_QUERY: 1426 gatt_client->state = P_W4_SERVICE_WITH_UUID_RESULT; 1427 send_gatt_services_by_uuid_request(gatt_client); 1428 break; 1429 1430 case P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY: 1431 gatt_client->state = P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT; 1432 send_gatt_characteristic_request(gatt_client); 1433 break; 1434 1435 case P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY: 1436 gatt_client->state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 1437 send_gatt_characteristic_request(gatt_client); 1438 break; 1439 1440 case P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY: 1441 gatt_client->state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 1442 send_gatt_characteristic_descriptor_request(gatt_client); 1443 break; 1444 1445 case P_W2_SEND_INCLUDED_SERVICE_QUERY: 1446 gatt_client->state = P_W4_INCLUDED_SERVICE_QUERY_RESULT; 1447 send_gatt_included_service_request(gatt_client); 1448 break; 1449 1450 case P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY: 1451 gatt_client->state = P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT; 1452 send_gatt_included_service_uuid_request(gatt_client); 1453 break; 1454 1455 case P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY: 1456 gatt_client->state = P_W4_READ_CHARACTERISTIC_VALUE_RESULT; 1457 send_gatt_read_characteristic_value_request(gatt_client); 1458 break; 1459 1460 case P_W2_SEND_READ_BLOB_QUERY: 1461 gatt_client->state = P_W4_READ_BLOB_RESULT; 1462 send_gatt_read_blob_request(gatt_client); 1463 break; 1464 1465 case P_W2_SEND_READ_BY_TYPE_REQUEST: 1466 gatt_client->state = P_W4_READ_BY_TYPE_RESPONSE; 1467 send_gatt_read_by_type_request(gatt_client); 1468 break; 1469 1470 case P_W2_SEND_READ_MULTIPLE_REQUEST: 1471 gatt_client->state = P_W4_READ_MULTIPLE_RESPONSE; 1472 send_gatt_read_multiple_request(gatt_client); 1473 break; 1474 1475 #ifdef ENABLE_GATT_OVER_EATT 1476 case P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST: 1477 gatt_client->state = P_W4_READ_MULTIPLE_VARIABLE_RESPONSE; 1478 send_gatt_read_multiple_variable_request(gatt_client); 1479 break; 1480 #endif 1481 1482 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 1483 gatt_client->state = P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT; 1484 send_gatt_write_attribute_value_request(gatt_client); 1485 break; 1486 1487 case P_W2_PREPARE_WRITE: 1488 gatt_client->state = P_W4_PREPARE_WRITE_RESULT; 1489 send_gatt_prepare_write_request(gatt_client); 1490 break; 1491 1492 case P_W2_PREPARE_WRITE_SINGLE: 1493 gatt_client->state = P_W4_PREPARE_WRITE_SINGLE_RESULT; 1494 send_gatt_prepare_write_request(gatt_client); 1495 break; 1496 1497 case P_W2_PREPARE_RELIABLE_WRITE: 1498 gatt_client->state = P_W4_PREPARE_RELIABLE_WRITE_RESULT; 1499 send_gatt_prepare_write_request(gatt_client); 1500 break; 1501 1502 case P_W2_EXECUTE_PREPARED_WRITE: 1503 gatt_client->state = P_W4_EXECUTE_PREPARED_WRITE_RESULT; 1504 send_gatt_execute_write_request(gatt_client); 1505 break; 1506 1507 case P_W2_CANCEL_PREPARED_WRITE: 1508 gatt_client->state = P_W4_CANCEL_PREPARED_WRITE_RESULT; 1509 send_gatt_cancel_prepared_write_request(gatt_client); 1510 break; 1511 1512 case P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH: 1513 gatt_client->state = P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT; 1514 send_gatt_cancel_prepared_write_request(gatt_client); 1515 break; 1516 1517 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1518 case P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 1519 // use Find Information 1520 gatt_client->gatt_client_state = P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1521 send_gatt_characteristic_descriptor_request(gatt_client); 1522 #else 1523 case P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 1524 // Use Read By Type 1525 gatt_client->state = P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1526 send_gatt_read_client_characteristic_configuration_request(gatt_client); 1527 #endif 1528 break; 1529 1530 case P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY: 1531 gatt_client->state = P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT; 1532 send_gatt_read_characteristic_descriptor_request(gatt_client); 1533 break; 1534 1535 case P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY: 1536 gatt_client->state = P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT; 1537 send_gatt_read_blob_request(gatt_client); 1538 break; 1539 1540 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 1541 gatt_client->state = P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1542 send_gatt_write_attribute_value_request(gatt_client); 1543 break; 1544 1545 case P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION: 1546 gatt_client->state = P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT; 1547 send_gatt_write_client_characteristic_configuration_request(gatt_client); 1548 break; 1549 1550 case P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR: 1551 gatt_client->state = P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1552 send_gatt_prepare_write_request(gatt_client); 1553 break; 1554 1555 case P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR: 1556 gatt_client->state = P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1557 send_gatt_execute_write_request(gatt_client); 1558 break; 1559 1560 #ifdef ENABLE_LE_SIGNED_WRITE 1561 case P_W4_IDENTITY_RESOLVING: 1562 log_info("P_W4_IDENTITY_RESOLVING - state %x", sm_identity_resolving_state(gatt_client->con_handle)); 1563 switch (sm_identity_resolving_state(gatt_client->con_handle)){ 1564 case IRK_LOOKUP_SUCCEEDED: 1565 gatt_client->le_device_index = sm_le_device_index(gatt_client->con_handle); 1566 gatt_client->state = P_W4_CMAC_READY; 1567 if (sm_cmac_ready()){ 1568 gatt_client_run_for_client_start_signed_write(gatt_client); 1569 } 1570 break; 1571 case IRK_LOOKUP_FAILED: 1572 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1573 break; 1574 default: 1575 break; 1576 } 1577 packet_sent = false; 1578 break; 1579 1580 case P_W4_CMAC_READY: 1581 if (sm_cmac_ready()){ 1582 gatt_client_run_for_client_start_signed_write(gatt_client); 1583 } 1584 packet_sent = false; 1585 break; 1586 1587 case P_W2_SEND_SIGNED_WRITE: { 1588 gatt_client->state = P_W4_SEND_SIGNED_WRITE_DONE; 1589 // bump local signing counter 1590 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 1591 le_device_db_local_counter_set(gatt_client->le_device_index, sign_counter + 1); 1592 // send signed write command 1593 send_gatt_signed_write_request(gatt_client, sign_counter); 1594 // finally, notifiy client that write is complete 1595 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1596 break; 1597 } 1598 #endif 1599 default: 1600 done = false; 1601 break; 1602 } 1603 1604 if (done){ 1605 return packet_sent; 1606 } 1607 1608 // write without response callback 1609 btstack_context_callback_registration_t * callback = 1610 (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->write_without_response_requests); 1611 if (callback != NULL){ 1612 (*callback->callback)(callback->context); 1613 return true; 1614 } 1615 1616 // requested can send now old 1617 if (gatt_client->write_without_response_callback != NULL){ 1618 btstack_packet_handler_t packet_handler = gatt_client->write_without_response_callback; 1619 gatt_client->write_without_response_callback = NULL; 1620 uint8_t event[4]; 1621 event[0] = GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE; 1622 event[1] = sizeof(event) - 2u; 1623 little_endian_store_16(event, 2, gatt_client->con_handle); 1624 packet_handler(HCI_EVENT_PACKET, gatt_client->con_handle, event, sizeof(event)); 1625 return true; // to trigger requeueing (even if higher layer didn't sent) 1626 } 1627 1628 return false; 1629 } 1630 1631 static void gatt_client_run(void){ 1632 btstack_linked_item_t *it; 1633 bool packet_sent; 1634 #ifdef ENABLE_GATT_OVER_EATT 1635 btstack_linked_list_iterator_t it_eatt; 1636 #endif 1637 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 1638 gatt_client_t * gatt_client = (gatt_client_t *) it; 1639 switch (gatt_client->bearer_type){ 1640 case ATT_BEARER_UNENHANCED_LE: 1641 #ifdef ENABLE_GATT_OVER_EATT 1642 btstack_linked_list_iterator_init(&it_eatt, &gatt_client->eatt_clients); 1643 while (btstack_linked_list_iterator_has_next(&it_eatt)) { 1644 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it_eatt); 1645 if (eatt_client->state != P_READY){ 1646 if (att_dispatch_client_can_send_now(gatt_client->con_handle)){ 1647 gatt_client_run_for_gatt_client(eatt_client); 1648 } 1649 } 1650 } 1651 #endif 1652 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) { 1653 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1654 return; 1655 } 1656 packet_sent = gatt_client_run_for_gatt_client(gatt_client); 1657 if (packet_sent){ 1658 // request new permission 1659 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1660 // requeue client for fairness and exit 1661 // note: iterator has become invalid 1662 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1663 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1664 return; 1665 } 1666 break; 1667 #ifdef ENABLE_GATT_OVER_CLASSIC 1668 case ATT_BEARER_UNENHANCED_CLASSIC: 1669 if (gatt_client->con_handle == HCI_CON_HANDLE_INVALID) { 1670 continue; 1671 } 1672 1673 // handle GATT over BR/EDR 1674 if (att_dispatch_client_can_send_now(gatt_client->con_handle) == false) { 1675 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1676 return; 1677 } 1678 packet_sent = gatt_client_run_for_gatt_client(gatt_client); 1679 if (packet_sent){ 1680 // request new permission 1681 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1682 // requeue client for fairness and exit 1683 // note: iterator has become invalid 1684 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1685 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1686 return; 1687 } 1688 break; 1689 #endif 1690 default: 1691 btstack_unreachable(); 1692 break; 1693 } 1694 1695 1696 } 1697 } 1698 1699 // emit complete event, used to avoid emitting event from API call 1700 static void gatt_client_emit_events(void * context){ 1701 UNUSED(context); 1702 btstack_linked_item_t *it; 1703 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next) { 1704 gatt_client_t *gatt_client = (gatt_client_t *) it; 1705 if (gatt_client->state == P_W2_EMIT_QUERY_COMPLETE_EVENT){ 1706 gatt_client->state = P_READY; 1707 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1708 } 1709 } 1710 } 1711 1712 static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code) { 1713 if (is_ready(gatt_client)) return; 1714 gatt_client_handle_transaction_complete(gatt_client, att_error_code); 1715 } 1716 1717 static void gatt_client_handle_reencryption_complete(const uint8_t * packet){ 1718 hci_con_handle_t con_handle = sm_event_reencryption_complete_get_handle(packet); 1719 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 1720 if (gatt_client == NULL) return; 1721 1722 // update security level 1723 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 1724 1725 gatt_client->reencryption_result = sm_event_reencryption_complete_get_status(packet); 1726 gatt_client->reencryption_active = false; 1727 gatt_client->wait_for_authentication_complete = false; 1728 1729 if (gatt_client->state == P_READY) return; 1730 1731 switch (sm_event_reencryption_complete_get_status(packet)){ 1732 case ERROR_CODE_SUCCESS: 1733 log_info("re-encryption success, retry operation"); 1734 break; 1735 case ERROR_CODE_AUTHENTICATION_FAILURE: 1736 case ERROR_CODE_PIN_OR_KEY_MISSING: 1737 #if defined(ENABLE_GATT_CLIENT_PAIRING) && !defined(ENABLE_LE_PROACTIVE_AUTHENTICATION) 1738 if (gatt_client_required_security_level == LEVEL_0) { 1739 // re-encryption failed for reactive authentication with pairing and we have a pending client request 1740 // => try to resolve it by deleting bonding information if we started pairing before 1741 // delete bonding information 1742 int le_device_db_index = sm_le_device_index(gatt_client->con_handle); 1743 btstack_assert(le_device_db_index >= 0); 1744 log_info("reactive auth with pairing: delete bonding and start pairing"); 1745 #ifdef ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION 1746 hci_remove_le_device_db_entry_from_resolving_list((uint16_t) le_device_db_index); 1747 #endif 1748 le_device_db_remove(le_device_db_index); 1749 // trigger pairing again 1750 sm_request_pairing(gatt_client->con_handle); 1751 break; 1752 } 1753 #endif 1754 // report bonding information missing 1755 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1756 break; 1757 default: 1758 // report bonding information missing 1759 gatt_client_handle_transaction_complete(gatt_client, gatt_client->pending_error_code); 1760 break; 1761 } 1762 } 1763 1764 static void gatt_client_handle_disconnection_complete(const uint8_t * packet){ 1765 log_info("GATT Client: HCI_EVENT_DISCONNECTION_COMPLETE"); 1766 hci_con_handle_t con_handle = little_endian_read_16(packet,3); 1767 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 1768 if (gatt_client == NULL) return; 1769 1770 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 1771 gatt_client_timeout_stop(gatt_client); 1772 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1773 btstack_memory_gatt_client_free(gatt_client); 1774 } 1775 1776 static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1777 UNUSED(channel); // ok: handling own l2cap events 1778 UNUSED(size); // ok: there is no channel 1779 1780 if (packet_type != HCI_EVENT_PACKET) return; 1781 1782 hci_con_handle_t con_handle; 1783 gatt_client_t * gatt_client; 1784 switch (hci_event_packet_get_type(packet)) { 1785 case HCI_EVENT_DISCONNECTION_COMPLETE: 1786 gatt_client_handle_disconnection_complete(packet); 1787 break; 1788 1789 // Pairing complete (with/without bonding=storing of pairing information) 1790 case SM_EVENT_PAIRING_COMPLETE: 1791 con_handle = sm_event_pairing_complete_get_handle(packet); 1792 gatt_client = gatt_client_get_context_for_handle(con_handle); 1793 if (gatt_client == NULL) break; 1794 1795 // update security level 1796 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 1797 1798 if (gatt_client->wait_for_authentication_complete){ 1799 gatt_client->wait_for_authentication_complete = false; 1800 if (sm_event_pairing_complete_get_status(packet) != ERROR_CODE_SUCCESS){ 1801 log_info("pairing failed, report previous error 0x%x", gatt_client->pending_error_code); 1802 gatt_client_report_error_if_pending(gatt_client, gatt_client->pending_error_code); 1803 } else { 1804 log_info("pairing success, retry operation"); 1805 } 1806 } 1807 break; 1808 1809 #ifdef ENABLE_LE_SIGNED_WRITE 1810 // Identity Resolving completed (no code, gatt_client_run will continue) 1811 case SM_EVENT_IDENTITY_RESOLVING_SUCCEEDED: 1812 case SM_EVENT_IDENTITY_RESOLVING_FAILED: 1813 break; 1814 #endif 1815 1816 // re-encryption started 1817 case SM_EVENT_REENCRYPTION_STARTED: 1818 con_handle = sm_event_reencryption_complete_get_handle(packet); 1819 gatt_client = gatt_client_get_context_for_handle(con_handle); 1820 if (gatt_client == NULL) break; 1821 1822 gatt_client->reencryption_active = true; 1823 gatt_client->reencryption_result = ERROR_CODE_SUCCESS; 1824 break; 1825 1826 // re-encryption complete 1827 case SM_EVENT_REENCRYPTION_COMPLETE: 1828 gatt_client_handle_reencryption_complete(packet); 1829 break; 1830 default: 1831 break; 1832 } 1833 1834 gatt_client_run(); 1835 } 1836 1837 static void gatt_client_handle_att_read_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { 1838 switch (gatt_client->state) { 1839 case P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT: 1840 if (size >= 17) { 1841 uint8_t uuid128[16]; 1842 reverse_128(&packet[1], uuid128); 1843 report_gatt_included_service_uuid128(gatt_client, gatt_client->start_group_handle, uuid128); 1844 } 1845 trigger_next_included_service_query(gatt_client, gatt_client->start_group_handle); 1846 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1847 break; 1848 1849 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 1850 report_gatt_characteristic_value(gatt_client, gatt_client->attribute_handle, &packet[1], size - 1u); 1851 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1852 break; 1853 1854 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: 1855 report_gatt_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], 1856 size - 1u, 0u); 1857 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1858 break; 1859 1860 // Use ATT_READ_REQUEST for first blob of Read Long Characteristic 1861 case P_W4_READ_BLOB_RESULT: 1862 report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], 1863 size - 1u, gatt_client->attribute_offset); 1864 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, size - 1u); 1865 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1866 break; 1867 1868 // Use ATT_READ_REQUEST for first blob of Read Long Characteristic Descriptor 1869 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 1870 report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], 1871 size - 1u, gatt_client->attribute_offset); 1872 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, 1873 size - 1u); 1874 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1875 break; 1876 1877 default: 1878 break; 1879 } 1880 } 1881 1882 static void gatt_client_handle_att_read_by_type_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { 1883 switch (gatt_client->state) { 1884 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 1885 report_gatt_characteristics(gatt_client, packet, size); 1886 trigger_next_characteristic_query(gatt_client, 1887 get_last_result_handle_from_characteristics_list(packet, size)); 1888 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1889 break; 1890 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 1891 report_gatt_characteristics(gatt_client, packet, size); 1892 trigger_next_characteristic_query(gatt_client, 1893 get_last_result_handle_from_characteristics_list(packet, size)); 1894 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1895 break; 1896 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: { 1897 if (size < 2u) break; 1898 uint16_t uuid16 = 0; 1899 uint16_t pair_size = packet[1]; 1900 1901 if (pair_size == 6u) { 1902 if (size < 8u) break; 1903 // UUIDs not available, query first included service 1904 gatt_client->start_group_handle = little_endian_read_16(packet, 2); // ready for next query 1905 gatt_client->query_start_handle = little_endian_read_16(packet, 4); 1906 gatt_client->query_end_handle = little_endian_read_16(packet, 6); 1907 gatt_client->state = P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY; 1908 break; 1909 } 1910 1911 if (pair_size != 8u) break; 1912 1913 // UUIDs included, report all of them 1914 uint16_t offset; 1915 for (offset = 2u; (offset + 8u) <= size; offset += pair_size) { 1916 uint16_t include_handle = little_endian_read_16(packet, offset); 1917 gatt_client->query_start_handle = little_endian_read_16(packet, offset + 2u); 1918 gatt_client->query_end_handle = little_endian_read_16(packet, offset + 4u); 1919 uuid16 = little_endian_read_16(packet, offset + 6u); 1920 report_gatt_included_service_uuid16(gatt_client, include_handle, uuid16); 1921 } 1922 1923 trigger_next_included_service_query(gatt_client, 1924 get_last_result_handle_from_included_services_list(packet, 1925 size)); 1926 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1927 break; 1928 } 1929 #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1930 case P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT: 1931 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, 2); 1932 gatt_client->state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 1933 break; 1934 #endif 1935 case P_W4_READ_BY_TYPE_RESPONSE: { 1936 uint16_t pair_size = packet[1]; 1937 // set last result handle to last valid handle, only used if pair_size invalid 1938 uint16_t last_result_handle = 0xffff; 1939 if (pair_size > 2) { 1940 uint16_t offset; 1941 for (offset = 2; offset < size; offset += pair_size) { 1942 uint16_t value_handle = little_endian_read_16(packet, offset); 1943 report_gatt_characteristic_value(gatt_client, value_handle, &packet[offset + 2u], 1944 pair_size - 2u); 1945 last_result_handle = value_handle; 1946 } 1947 } 1948 trigger_next_read_by_type_query(gatt_client, last_result_handle); 1949 break; 1950 } 1951 default: 1952 break; 1953 } 1954 } 1955 1956 static void gatt_client_handle_att_write_response(gatt_client_t *gatt_client) { 1957 switch (gatt_client->state) { 1958 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 1959 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1960 break; 1961 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 1962 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1963 break; 1964 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1965 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1966 break; 1967 default: 1968 break; 1969 } 1970 } 1971 1972 static void gatt_client_handle_att_response(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size) { 1973 uint8_t att_status; 1974 switch (packet[0]) { 1975 case ATT_EXCHANGE_MTU_RESPONSE: { 1976 if (size < 3u) break; 1977 bool update_gatt_server_att_mtu = false; 1978 uint16_t remote_rx_mtu = little_endian_read_16(packet, 1); 1979 uint16_t local_rx_mtu = l2cap_max_le_mtu(); 1980 switch (gatt_client->bearer_type){ 1981 case ATT_BEARER_UNENHANCED_LE: 1982 update_gatt_server_att_mtu = true; 1983 break; 1984 #ifdef ENABLE_GATT_OVER_CLASSIC 1985 case ATT_BEARER_UNENHANCED_CLASSIC: 1986 local_rx_mtu = gatt_client->mtu; 1987 break; 1988 #endif 1989 default: 1990 btstack_unreachable(); 1991 break; 1992 } 1993 1994 uint16_t mtu = (remote_rx_mtu < local_rx_mtu) ? remote_rx_mtu : local_rx_mtu; 1995 1996 // set gatt client mtu 1997 gatt_client->mtu = mtu; 1998 gatt_client->mtu_state = MTU_EXCHANGED; 1999 2000 if (update_gatt_server_att_mtu){ 2001 // set per connection mtu state - for fixed channel 2002 hci_connection_t *hci_connection = hci_connection_for_handle(gatt_client->con_handle); 2003 hci_connection->att_connection.mtu = gatt_client->mtu; 2004 hci_connection->att_connection.mtu_exchanged = true; 2005 } 2006 emit_gatt_mtu_exchanged_result_event(gatt_client, gatt_client->mtu); 2007 break; 2008 } 2009 case ATT_READ_BY_GROUP_TYPE_RESPONSE: 2010 switch (gatt_client->state) { 2011 case P_W4_SERVICE_QUERY_RESULT: 2012 report_gatt_services(gatt_client, packet, size); 2013 trigger_next_service_query(gatt_client, get_last_result_handle_from_service_list(packet, size)); 2014 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2015 break; 2016 default: 2017 break; 2018 } 2019 break; 2020 case ATT_HANDLE_VALUE_NOTIFICATION: 2021 if (size < 3u) return; 2022 report_gatt_notification(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); 2023 return; 2024 #ifdef ENABLE_GATT_OVER_EATT 2025 case ATT_MULTIPLE_HANDLE_VALUE_NTF: 2026 if (size >= 5u) { 2027 uint16_t offset = 1; 2028 while (true){ 2029 uint16_t value_handle = little_endian_read_16(packet, offset); 2030 offset += 2; 2031 uint16_t value_length = little_endian_read_16(packet, offset); 2032 offset += 2; 2033 if ((offset + value_length) > size) break; 2034 report_gatt_notification(gatt_client, value_handle, &packet[offset], value_length); 2035 offset += value_length; 2036 } 2037 } 2038 return; 2039 #endif 2040 case ATT_HANDLE_VALUE_INDICATION: 2041 if (size < 3u) break; 2042 report_gatt_indication(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); 2043 gatt_client->send_confirmation = true; 2044 break; 2045 case ATT_READ_BY_TYPE_RESPONSE: 2046 gatt_client_handle_att_read_by_type_response(gatt_client, packet, size); 2047 break; 2048 case ATT_READ_RESPONSE: 2049 gatt_client_handle_att_read_response(gatt_client, packet, size); 2050 break; 2051 case ATT_FIND_BY_TYPE_VALUE_RESPONSE: { 2052 uint8_t pair_size = 4; 2053 int i; 2054 uint16_t start_group_handle; 2055 uint16_t end_group_handle = 0xffff; // asserts GATT_EVENT_QUERY_COMPLETE is emitted if no results 2056 for (i = 1u; (i + pair_size) <= size; i += pair_size) { 2057 start_group_handle = little_endian_read_16(packet, i); 2058 end_group_handle = little_endian_read_16(packet, i + 2); 2059 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, 2060 gatt_client->uuid128); 2061 } 2062 trigger_next_service_by_uuid_query(gatt_client, end_group_handle); 2063 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2064 break; 2065 } 2066 case ATT_FIND_INFORMATION_REPLY: { 2067 if (size < 2u) break; 2068 2069 uint8_t pair_size = 4; 2070 if (packet[1u] == 2u) { 2071 pair_size = 18; 2072 } 2073 uint16_t offset = 2; 2074 2075 if (size < (pair_size + offset)) break; 2076 uint16_t last_descriptor_handle = little_endian_read_16(packet, size - pair_size); 2077 2078 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 2079 log_info("ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY, state %x", gatt_client->gatt_client_state); 2080 if (gatt_client->gatt_client_state == P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT){ 2081 // iterate over descriptors looking for CCC 2082 if (pair_size == 4){ 2083 while ((offset + 4) <= size){ 2084 uint16_t uuid16 = little_endian_read_16(packet, offset + 2); 2085 if (uuid16 == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION){ 2086 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, offset); 2087 gatt_client->gatt_client_state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 2088 log_info("CCC found %x", gatt_client->client_characteristic_configuration_handle); 2089 break; 2090 } 2091 offset += pair_size; 2092 } 2093 } 2094 if (is_query_done(gatt_client, last_descriptor_handle)){ 2095 2096 } else { 2097 // next 2098 gatt_client->start_group_handle = last_descriptor_handle + 1; 2099 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2100 } 2101 break; 2102 } 2103 #endif 2104 report_gatt_all_characteristic_descriptors(gatt_client, &packet[2], size - 2u, pair_size); 2105 trigger_next_characteristic_descriptor_query(gatt_client, last_descriptor_handle); 2106 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2107 break; 2108 } 2109 2110 case ATT_WRITE_RESPONSE: 2111 gatt_client_handle_att_write_response(gatt_client); 2112 break; 2113 2114 case ATT_READ_BLOB_RESPONSE: { 2115 uint16_t received_blob_length = size - 1u; 2116 switch (gatt_client->state) { 2117 case P_W4_READ_BLOB_RESULT: 2118 report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], 2119 received_blob_length, gatt_client->attribute_offset); 2120 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, received_blob_length); 2121 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2122 break; 2123 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 2124 report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, 2125 &packet[1], received_blob_length, 2126 gatt_client->attribute_offset); 2127 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, 2128 received_blob_length); 2129 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2130 break; 2131 default: 2132 break; 2133 } 2134 break; 2135 } 2136 case ATT_PREPARE_WRITE_RESPONSE: 2137 switch (gatt_client->state) { 2138 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 2139 if (is_value_valid(gatt_client, packet, size)) { 2140 att_status = ATT_ERROR_SUCCESS; 2141 } else { 2142 att_status = ATT_ERROR_DATA_MISMATCH; 2143 } 2144 gatt_client_handle_transaction_complete(gatt_client, att_status); 2145 break; 2146 2147 case P_W4_PREPARE_WRITE_RESULT: { 2148 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 2149 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE, P_W2_EXECUTE_PREPARED_WRITE); 2150 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2151 break; 2152 } 2153 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: { 2154 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 2155 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR, 2156 P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR); 2157 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2158 break; 2159 } 2160 case P_W4_PREPARE_RELIABLE_WRITE_RESULT: { 2161 if (is_value_valid(gatt_client, packet, size)) { 2162 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 2163 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_RELIABLE_WRITE, 2164 P_W2_EXECUTE_PREPARED_WRITE); 2165 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2166 break; 2167 } 2168 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 2169 break; 2170 } 2171 default: 2172 break; 2173 } 2174 break; 2175 2176 case ATT_EXECUTE_WRITE_RESPONSE: 2177 switch (gatt_client->state) { 2178 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 2179 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2180 break; 2181 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 2182 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2183 break; 2184 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 2185 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_DATA_MISMATCH); 2186 break; 2187 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2188 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2189 break; 2190 default: 2191 break; 2192 2193 } 2194 break; 2195 2196 case ATT_READ_MULTIPLE_RESPONSE: 2197 switch (gatt_client->state) { 2198 case P_W4_READ_MULTIPLE_RESPONSE: 2199 report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); 2200 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2201 break; 2202 default: 2203 break; 2204 } 2205 break; 2206 2207 #ifdef ENABLE_GATT_OVER_EATT 2208 case ATT_READ_MULTIPLE_VARIABLE_RSP: 2209 switch (gatt_client->state) { 2210 case P_W4_READ_MULTIPLE_VARIABLE_RESPONSE: 2211 report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); 2212 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2213 break; 2214 default: 2215 break; 2216 } 2217 break; 2218 #endif 2219 2220 case ATT_ERROR_RESPONSE: 2221 if (size < 5u) return; 2222 att_status = packet[4]; 2223 switch (att_status) { 2224 case ATT_ERROR_ATTRIBUTE_NOT_FOUND: { 2225 switch (gatt_client->state) { 2226 case P_W4_SERVICE_QUERY_RESULT: 2227 case P_W4_SERVICE_WITH_UUID_RESULT: 2228 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: 2229 case P_W4_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT: 2230 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2231 break; 2232 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 2233 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 2234 report_gatt_characteristic_end_found(gatt_client, gatt_client->end_group_handle); 2235 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2236 break; 2237 case P_W4_READ_BY_TYPE_RESPONSE: 2238 if (gatt_client->start_group_handle == gatt_client->query_start_handle) { 2239 att_status = ATT_ERROR_ATTRIBUTE_NOT_FOUND; 2240 } else { 2241 att_status = ATT_ERROR_SUCCESS; 2242 } 2243 gatt_client_handle_transaction_complete(gatt_client, att_status); 2244 break; 2245 default: 2246 gatt_client_report_error_if_pending(gatt_client, att_status); 2247 break; 2248 } 2249 break; 2250 } 2251 2252 #ifdef ENABLE_GATT_CLIENT_PAIRING 2253 2254 case ATT_ERROR_INSUFFICIENT_AUTHENTICATION: 2255 case ATT_ERROR_INSUFFICIENT_ENCRYPTION_KEY_SIZE: 2256 case ATT_ERROR_INSUFFICIENT_ENCRYPTION: { 2257 2258 // security too low 2259 if (gatt_client->security_counter > 0) { 2260 gatt_client_report_error_if_pending(gatt_client, att_status); 2261 break; 2262 } 2263 // start security 2264 gatt_client->security_counter++; 2265 2266 // setup action 2267 int retry = 1; 2268 switch (gatt_client->state){ 2269 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 2270 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY ; 2271 break; 2272 case P_W4_READ_BLOB_RESULT: 2273 gatt_client->state = P_W2_SEND_READ_BLOB_QUERY; 2274 break; 2275 case P_W4_READ_BY_TYPE_RESPONSE: 2276 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2277 break; 2278 case P_W4_READ_MULTIPLE_RESPONSE: 2279 gatt_client->state = P_W2_SEND_READ_MULTIPLE_REQUEST; 2280 break; 2281 case P_W4_READ_MULTIPLE_VARIABLE_RESPONSE: 2282 gatt_client->state = P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST; 2283 break; 2284 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 2285 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 2286 break; 2287 case P_W4_PREPARE_WRITE_RESULT: 2288 gatt_client->state = P_W2_PREPARE_WRITE; 2289 break; 2290 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 2291 gatt_client->state = P_W2_PREPARE_WRITE_SINGLE; 2292 break; 2293 case P_W4_PREPARE_RELIABLE_WRITE_RESULT: 2294 gatt_client->state = P_W2_PREPARE_RELIABLE_WRITE; 2295 break; 2296 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 2297 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE; 2298 break; 2299 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 2300 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE; 2301 break; 2302 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 2303 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 2304 break; 2305 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: 2306 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 2307 break; 2308 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 2309 gatt_client->state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 2310 break; 2311 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2312 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 2313 break; 2314 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 2315 gatt_client->state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 2316 break; 2317 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2318 gatt_client->state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 2319 break; 2320 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2321 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR; 2322 break; 2323 #ifdef ENABLE_LE_SIGNED_WRITE 2324 case P_W4_SEND_SIGNED_WRITE_DONE: 2325 gatt_client->state = P_W2_SEND_SIGNED_WRITE; 2326 break; 2327 #endif 2328 default: 2329 log_info("retry not supported for state %x", gatt_client->state); 2330 retry = 0; 2331 break; 2332 } 2333 2334 if (!retry) { 2335 gatt_client_report_error_if_pending(gatt_client, att_status); 2336 break; 2337 } 2338 2339 log_info("security error, start pairing"); 2340 2341 // start pairing for higher security level 2342 gatt_client->wait_for_authentication_complete = true; 2343 gatt_client->pending_error_code = att_status; 2344 sm_request_pairing(gatt_client->con_handle); 2345 break; 2346 } 2347 #endif 2348 2349 // nothing we can do about that 2350 case ATT_ERROR_INSUFFICIENT_AUTHORIZATION: 2351 default: 2352 gatt_client_report_error_if_pending(gatt_client, att_status); 2353 break; 2354 } 2355 break; 2356 2357 default: 2358 log_info("ATT Handler, unhandled response type 0x%02x", packet[0]); 2359 break; 2360 } 2361 } 2362 2363 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size) { 2364 gatt_client_t *gatt_client; 2365 #ifdef ENABLE_GATT_OVER_CLASSIC 2366 uint8_t status; 2367 hci_connection_t * hci_connection; 2368 hci_con_handle_t con_handle; 2369 #endif 2370 2371 if (size < 1u) return; 2372 switch (packet_type){ 2373 case HCI_EVENT_PACKET: 2374 switch (hci_event_packet_get_type(packet)) { 2375 #ifdef ENABLE_GATT_OVER_CLASSIC 2376 case L2CAP_EVENT_CHANNEL_OPENED: 2377 status = l2cap_event_channel_opened_get_status(packet); 2378 gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_opened_get_local_cid(packet)); 2379 if (gatt_client != NULL){ 2380 con_handle = l2cap_event_channel_opened_get_handle(packet); 2381 hci_connection = hci_connection_for_handle(con_handle); 2382 if (status == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_RESOURCES){ 2383 if ((hci_connection != NULL) && hci_connection->att_server.incoming_connection_request) { 2384 log_info("Collision, retry in 100ms"); 2385 gatt_client->state = P_W2_L2CAP_CONNECT; 2386 // set timer for retry 2387 btstack_run_loop_set_timer(&gatt_client->gc_timeout, GATT_CLIENT_COLLISION_BACKOFF_MS); 2388 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_classic_retry); 2389 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 2390 break; 2391 } 2392 } 2393 // if status != 0, gatt_client will be discarded 2394 gatt_client->state = P_READY; 2395 gatt_client->con_handle = l2cap_event_channel_opened_get_handle(packet); 2396 gatt_client->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); 2397 gatt_client_classic_handle_connected(gatt_client, status); 2398 } 2399 break; 2400 case L2CAP_EVENT_CHANNEL_CLOSED: 2401 gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_closed_get_local_cid(packet)); 2402 if (gatt_client != NULL){ 2403 // discard gatt client object 2404 gatt_client_classic_handle_disconnected(gatt_client); 2405 } 2406 break; 2407 #endif 2408 case L2CAP_EVENT_CAN_SEND_NOW: 2409 gatt_client_run(); 2410 break; 2411 // att_server has negotiated the mtu for this connection, cache if context exists 2412 case ATT_EVENT_MTU_EXCHANGE_COMPLETE: 2413 if (size < 6u) break; 2414 gatt_client = gatt_client_get_context_for_handle(handle); 2415 if (gatt_client != NULL) { 2416 gatt_client->mtu = little_endian_read_16(packet, 4); 2417 } 2418 break; 2419 default: 2420 break; 2421 } 2422 break; 2423 2424 case ATT_DATA_PACKET: 2425 // special cases: notifications & indications motivate creating context 2426 switch (packet[0]) { 2427 case ATT_HANDLE_VALUE_NOTIFICATION: 2428 case ATT_HANDLE_VALUE_INDICATION: 2429 gatt_client_provide_context_for_handle(handle, &gatt_client); 2430 break; 2431 default: 2432 gatt_client = gatt_client_get_context_for_handle(handle); 2433 break; 2434 } 2435 2436 if (gatt_client != NULL) { 2437 gatt_client_handle_att_response(gatt_client, packet, size); 2438 gatt_client_run(); 2439 } 2440 break; 2441 2442 #ifdef ENABLE_GATT_OVER_CLASSIC 2443 case L2CAP_DATA_PACKET: 2444 gatt_client = gatt_client_get_context_for_l2cap_cid(handle); 2445 if (gatt_client != NULL){ 2446 gatt_client_handle_att_response(gatt_client, packet, size); 2447 gatt_client_run(); 2448 } 2449 break; 2450 #endif 2451 2452 default: 2453 break; 2454 } 2455 } 2456 2457 #ifdef ENABLE_LE_SIGNED_WRITE 2458 static void att_signed_write_handle_cmac_result(uint8_t hash[8]){ 2459 btstack_linked_list_iterator_t it; 2460 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 2461 while (btstack_linked_list_iterator_has_next(&it)){ 2462 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 2463 if (gatt_client->state == P_W4_CMAC_RESULT){ 2464 // store result 2465 (void)memcpy(gatt_client->cmac, hash, 8); 2466 // reverse_64(hash, gatt_client->cmac); 2467 gatt_client->state = P_W2_SEND_SIGNED_WRITE; 2468 gatt_client_run(); 2469 return; 2470 } 2471 } 2472 } 2473 2474 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){ 2475 gatt_client_t * gatt_client; 2476 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2477 if (status != ERROR_CODE_SUCCESS){ 2478 return status; 2479 } 2480 if (is_ready(gatt_client) == 0){ 2481 return GATT_CLIENT_IN_WRONG_STATE; 2482 } 2483 2484 gatt_client->callback = callback; 2485 gatt_client->attribute_handle = value_handle; 2486 gatt_client->attribute_length = message_len; 2487 gatt_client->attribute_value = message; 2488 gatt_client->state = P_W4_IDENTITY_RESOLVING; 2489 gatt_client_run(); 2490 return ERROR_CODE_SUCCESS; 2491 } 2492 #endif 2493 2494 uint8_t gatt_client_discover_primary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2495 gatt_client_t * gatt_client; 2496 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2497 if (status != ERROR_CODE_SUCCESS){ 2498 return status; 2499 } 2500 2501 gatt_client->callback = callback; 2502 gatt_client->start_group_handle = 0x0001; 2503 gatt_client->end_group_handle = 0xffff; 2504 gatt_client->state = P_W2_SEND_SERVICE_QUERY; 2505 gatt_client->uuid16 = GATT_PRIMARY_SERVICE_UUID; 2506 gatt_client_run(); 2507 return ERROR_CODE_SUCCESS; 2508 } 2509 2510 uint8_t gatt_client_discover_secondary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2511 gatt_client_t * gatt_client; 2512 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2513 if (status != ERROR_CODE_SUCCESS){ 2514 return status; 2515 } 2516 2517 gatt_client->callback = callback; 2518 gatt_client->start_group_handle = 0x0001; 2519 gatt_client->end_group_handle = 0xffff; 2520 gatt_client->state = P_W2_SEND_SERVICE_QUERY; 2521 gatt_client->uuid16 = GATT_SECONDARY_SERVICE_UUID; 2522 gatt_client_run(); 2523 return ERROR_CODE_SUCCESS; 2524 } 2525 2526 uint8_t gatt_client_discover_primary_services_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t uuid16){ 2527 gatt_client_t * gatt_client; 2528 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2529 if (status != ERROR_CODE_SUCCESS){ 2530 return status; 2531 } 2532 2533 gatt_client->callback = callback; 2534 gatt_client->start_group_handle = 0x0001; 2535 gatt_client->end_group_handle = 0xffff; 2536 gatt_client->state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 2537 gatt_client->uuid16 = uuid16; 2538 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), gatt_client->uuid16); 2539 gatt_client_run(); 2540 return ERROR_CODE_SUCCESS; 2541 } 2542 2543 uint8_t gatt_client_discover_primary_services_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, const uint8_t * uuid128){ 2544 gatt_client_t * gatt_client; 2545 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2546 if (status != ERROR_CODE_SUCCESS){ 2547 return status; 2548 } 2549 2550 gatt_client->callback = callback; 2551 gatt_client->start_group_handle = 0x0001; 2552 gatt_client->end_group_handle = 0xffff; 2553 gatt_client->uuid16 = 0; 2554 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2555 gatt_client->state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 2556 gatt_client_run(); 2557 return ERROR_CODE_SUCCESS; 2558 } 2559 2560 uint8_t gatt_client_discover_characteristics_for_service(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service){ 2561 gatt_client_t * gatt_client; 2562 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2563 if (status != ERROR_CODE_SUCCESS){ 2564 return status; 2565 } 2566 2567 gatt_client->callback = callback; 2568 gatt_client->start_group_handle = service->start_group_handle; 2569 gatt_client->end_group_handle = service->end_group_handle; 2570 gatt_client->filter_with_uuid = false; 2571 gatt_client->characteristic_start_handle = 0; 2572 gatt_client->state = P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY; 2573 gatt_client_run(); 2574 return ERROR_CODE_SUCCESS; 2575 } 2576 2577 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){ 2578 gatt_client_t * gatt_client; 2579 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2580 if (status != ERROR_CODE_SUCCESS){ 2581 return status; 2582 } 2583 2584 gatt_client->callback = callback; 2585 gatt_client->start_group_handle = service->start_group_handle; 2586 gatt_client->end_group_handle = service->end_group_handle; 2587 gatt_client->state = P_W2_SEND_INCLUDED_SERVICE_QUERY; 2588 2589 gatt_client_run(); 2590 return ERROR_CODE_SUCCESS; 2591 } 2592 2593 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){ 2594 gatt_client_t * gatt_client; 2595 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2596 if (status != ERROR_CODE_SUCCESS){ 2597 return status; 2598 } 2599 2600 gatt_client->callback = callback; 2601 gatt_client->start_group_handle = start_handle; 2602 gatt_client->end_group_handle = end_handle; 2603 gatt_client->filter_with_uuid = true; 2604 gatt_client->uuid16 = uuid16; 2605 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 2606 gatt_client->characteristic_start_handle = 0; 2607 gatt_client->state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 2608 gatt_client_run(); 2609 return ERROR_CODE_SUCCESS; 2610 } 2611 2612 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){ 2613 gatt_client_t * gatt_client; 2614 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2615 if (status != ERROR_CODE_SUCCESS){ 2616 return status; 2617 } 2618 2619 gatt_client->callback = callback; 2620 gatt_client->start_group_handle = start_handle; 2621 gatt_client->end_group_handle = end_handle; 2622 gatt_client->filter_with_uuid = true; 2623 gatt_client->uuid16 = 0; 2624 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2625 gatt_client->characteristic_start_handle = 0; 2626 gatt_client->state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 2627 gatt_client_run(); 2628 return ERROR_CODE_SUCCESS; 2629 } 2630 2631 2632 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){ 2633 return gatt_client_discover_characteristics_for_handle_range_by_uuid16(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid16); 2634 } 2635 2636 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){ 2637 return gatt_client_discover_characteristics_for_handle_range_by_uuid128(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid128); 2638 } 2639 2640 uint8_t gatt_client_discover_characteristic_descriptors(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 2641 gatt_client_t * gatt_client; 2642 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2643 if (status != ERROR_CODE_SUCCESS){ 2644 return status; 2645 } 2646 2647 // check if there is space for characteristics descriptors 2648 if (characteristic->end_handle > characteristic->value_handle){ 2649 gatt_client->callback = callback; 2650 gatt_client->start_group_handle = characteristic->value_handle + 1u; 2651 gatt_client->end_group_handle = characteristic->end_handle; 2652 gatt_client->state = P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY; 2653 gatt_client_run(); 2654 } else { 2655 // schedule gatt complete event on next run loop iteration otherwise 2656 gatt_client->state = P_W2_EMIT_QUERY_COMPLETE_EVENT; 2657 gatt_client_deferred_event_emit.callback = gatt_client_emit_events; 2658 btstack_run_loop_execute_on_main_thread(&gatt_client_deferred_event_emit); 2659 } 2660 return ERROR_CODE_SUCCESS; 2661 } 2662 2663 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){ 2664 gatt_client_t * gatt_client; 2665 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2666 if (status != ERROR_CODE_SUCCESS){ 2667 return status; 2668 } 2669 2670 gatt_client->callback = callback; 2671 gatt_client->attribute_handle = value_handle; 2672 gatt_client->attribute_offset = 0; 2673 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY; 2674 gatt_client_run(); 2675 return ERROR_CODE_SUCCESS; 2676 } 2677 2678 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){ 2679 gatt_client_t * gatt_client; 2680 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2681 if (status != ERROR_CODE_SUCCESS){ 2682 return status; 2683 } 2684 2685 gatt_client->callback = callback; 2686 gatt_client->start_group_handle = start_handle; 2687 gatt_client->end_group_handle = end_handle; 2688 gatt_client->query_start_handle = start_handle; 2689 gatt_client->query_end_handle = end_handle; 2690 gatt_client->uuid16 = uuid16; 2691 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 2692 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2693 gatt_client_run(); 2694 return ERROR_CODE_SUCCESS; 2695 } 2696 2697 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){ 2698 gatt_client_t * gatt_client; 2699 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2700 if (status != ERROR_CODE_SUCCESS){ 2701 return status; 2702 } 2703 2704 gatt_client->callback = callback; 2705 gatt_client->start_group_handle = start_handle; 2706 gatt_client->end_group_handle = end_handle; 2707 gatt_client->query_start_handle = start_handle; 2708 gatt_client->query_end_handle = end_handle; 2709 gatt_client->uuid16 = 0; 2710 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2711 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2712 gatt_client_run(); 2713 return ERROR_CODE_SUCCESS; 2714 } 2715 2716 2717 uint8_t gatt_client_read_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 2718 return gatt_client_read_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); 2719 } 2720 2721 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){ 2722 gatt_client_t * gatt_client; 2723 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2724 if (status != ERROR_CODE_SUCCESS){ 2725 return status; 2726 } 2727 2728 gatt_client->callback = callback; 2729 gatt_client->attribute_handle = value_handle; 2730 gatt_client->attribute_offset = offset; 2731 gatt_client->state = P_W2_SEND_READ_BLOB_QUERY; 2732 gatt_client_run(); 2733 return ERROR_CODE_SUCCESS; 2734 } 2735 2736 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){ 2737 return gatt_client_read_long_value_of_characteristic_using_value_handle_with_offset(callback, con_handle, value_handle, 0); 2738 } 2739 2740 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){ 2741 return gatt_client_read_long_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); 2742 } 2743 2744 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){ 2745 gatt_client_t * gatt_client; 2746 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2747 if (status != ERROR_CODE_SUCCESS){ 2748 return status; 2749 } 2750 2751 #ifdef ENABLE_GATT_OVER_EATT 2752 if (state == P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST){ 2753 if (gatt_client->bearer_type != ATT_BEARER_ENHANCED_LE){ 2754 return ERROR_CODE_COMMAND_DISALLOWED; 2755 } 2756 } 2757 #endif 2758 2759 gatt_client->callback = callback; 2760 gatt_client->read_multiple_handle_count = num_value_handles; 2761 gatt_client->read_multiple_handles = value_handles; 2762 gatt_client->state = state; 2763 gatt_client_run(); 2764 return ERROR_CODE_SUCCESS; 2765 } 2766 2767 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){ 2768 return gatt_client_read_multiple_characteristic_values_with_state(callback, con_handle, num_value_handles, value_handles, P_W2_SEND_READ_MULTIPLE_REQUEST); 2769 } 2770 2771 #ifdef ENABLE_GATT_OVER_EATT 2772 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){ 2773 return gatt_client_read_multiple_characteristic_values_with_state(callback, con_handle, num_value_handles, value_handles, P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST); 2774 } 2775 #endif 2776 2777 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){ 2778 gatt_client_t * gatt_client; 2779 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2780 if (status != ERROR_CODE_SUCCESS){ 2781 return status; 2782 } 2783 2784 if (value_length > (gatt_client->mtu - 3u)) return GATT_CLIENT_VALUE_TOO_LONG; 2785 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) return GATT_CLIENT_BUSY; 2786 2787 return att_write_request(gatt_client, ATT_WRITE_COMMAND, value_handle, value_length, value); 2788 } 2789 2790 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){ 2791 gatt_client_t * gatt_client; 2792 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2793 if (status != ERROR_CODE_SUCCESS){ 2794 return status; 2795 } 2796 2797 gatt_client->callback = callback; 2798 gatt_client->attribute_handle = value_handle; 2799 gatt_client->attribute_length = value_length; 2800 gatt_client->attribute_value = value; 2801 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 2802 gatt_client_run(); 2803 return ERROR_CODE_SUCCESS; 2804 } 2805 2806 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){ 2807 gatt_client_t * gatt_client; 2808 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2809 if (status != ERROR_CODE_SUCCESS){ 2810 return status; 2811 } 2812 2813 gatt_client->callback = callback; 2814 gatt_client->attribute_handle = value_handle; 2815 gatt_client->attribute_length = value_length; 2816 gatt_client->attribute_offset = offset; 2817 gatt_client->attribute_value = value; 2818 gatt_client->state = P_W2_PREPARE_WRITE; 2819 gatt_client_run(); 2820 return ERROR_CODE_SUCCESS; 2821 } 2822 2823 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){ 2824 return gatt_client_write_long_value_of_characteristic_with_offset(callback, con_handle, value_handle, 0, value_length, value); 2825 } 2826 2827 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){ 2828 gatt_client_t * gatt_client; 2829 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2830 if (status != ERROR_CODE_SUCCESS){ 2831 return status; 2832 } 2833 2834 gatt_client->callback = callback; 2835 gatt_client->attribute_handle = value_handle; 2836 gatt_client->attribute_length = value_length; 2837 gatt_client->attribute_offset = 0; 2838 gatt_client->attribute_value = value; 2839 gatt_client->state = P_W2_PREPARE_RELIABLE_WRITE; 2840 gatt_client_run(); 2841 return ERROR_CODE_SUCCESS; 2842 } 2843 2844 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){ 2845 gatt_client_t * gatt_client; 2846 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2847 if (status != ERROR_CODE_SUCCESS){ 2848 return status; 2849 } 2850 2851 if (configuration > 3){ 2852 return ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE; 2853 } 2854 2855 if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION) && 2856 ((characteristic->properties & ATT_PROPERTY_NOTIFY) == 0u)) { 2857 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED"); 2858 return GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED; 2859 } else if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION) && 2860 ((characteristic->properties & ATT_PROPERTY_INDICATE) == 0u)){ 2861 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED"); 2862 return GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED; 2863 } 2864 2865 gatt_client->callback = callback; 2866 gatt_client->start_group_handle = characteristic->value_handle; 2867 gatt_client->end_group_handle = characteristic->end_handle; 2868 little_endian_store_16(gatt_client->client_characteristic_configuration_value, 0, configuration); 2869 2870 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 2871 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2872 #else 2873 gatt_client->state = P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2874 #endif 2875 gatt_client_run(); 2876 return ERROR_CODE_SUCCESS; 2877 } 2878 2879 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){ 2880 gatt_client_t * gatt_client; 2881 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2882 if (status != ERROR_CODE_SUCCESS){ 2883 return status; 2884 } 2885 2886 gatt_client->callback = callback; 2887 gatt_client->attribute_handle = descriptor_handle; 2888 2889 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 2890 gatt_client_run(); 2891 return ERROR_CODE_SUCCESS; 2892 } 2893 2894 uint8_t gatt_client_read_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor){ 2895 return gatt_client_read_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2896 } 2897 2898 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){ 2899 gatt_client_t * gatt_client; 2900 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2901 if (status != ERROR_CODE_SUCCESS){ 2902 return status; 2903 } 2904 2905 gatt_client->callback = callback; 2906 gatt_client->attribute_handle = descriptor_handle; 2907 gatt_client->attribute_offset = offset; 2908 gatt_client->state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 2909 gatt_client_run(); 2910 return ERROR_CODE_SUCCESS; 2911 } 2912 2913 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){ 2914 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0); 2915 } 2916 2917 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){ 2918 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2919 } 2920 2921 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){ 2922 gatt_client_t * gatt_client; 2923 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2924 if (status != ERROR_CODE_SUCCESS){ 2925 return status; 2926 } 2927 2928 gatt_client->callback = callback; 2929 gatt_client->attribute_handle = descriptor_handle; 2930 gatt_client->attribute_length = value_length; 2931 gatt_client->attribute_offset = 0; 2932 gatt_client->attribute_value = value; 2933 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 2934 gatt_client_run(); 2935 return ERROR_CODE_SUCCESS; 2936 } 2937 2938 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){ 2939 return gatt_client_write_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); 2940 } 2941 2942 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){ 2943 gatt_client_t * gatt_client; 2944 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2945 if (status != ERROR_CODE_SUCCESS){ 2946 return status; 2947 } 2948 2949 gatt_client->callback = callback; 2950 gatt_client->attribute_handle = descriptor_handle; 2951 gatt_client->attribute_length = value_length; 2952 gatt_client->attribute_offset = offset; 2953 gatt_client->attribute_value = value; 2954 gatt_client->state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 2955 gatt_client_run(); 2956 return ERROR_CODE_SUCCESS; 2957 } 2958 2959 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){ 2960 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0, value_length, value); 2961 } 2962 2963 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){ 2964 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); 2965 } 2966 2967 /** 2968 * @brief -> gatt complete event 2969 */ 2970 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){ 2971 gatt_client_t * gatt_client; 2972 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2973 if (status != ERROR_CODE_SUCCESS){ 2974 return status; 2975 } 2976 2977 gatt_client->callback = callback; 2978 gatt_client->attribute_handle = attribute_handle; 2979 gatt_client->attribute_length = value_length; 2980 gatt_client->attribute_offset = offset; 2981 gatt_client->attribute_value = value; 2982 gatt_client->state = P_W2_PREPARE_WRITE_SINGLE; 2983 gatt_client_run(); 2984 return ERROR_CODE_SUCCESS; 2985 } 2986 2987 /** 2988 * @brief -> gatt complete event 2989 */ 2990 uint8_t gatt_client_execute_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2991 gatt_client_t * gatt_client; 2992 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2993 if (status != ERROR_CODE_SUCCESS){ 2994 return status; 2995 } 2996 2997 gatt_client->callback = callback; 2998 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE; 2999 gatt_client_run(); 3000 return ERROR_CODE_SUCCESS; 3001 } 3002 3003 /** 3004 * @brief -> gatt complete event 3005 */ 3006 uint8_t gatt_client_cancel_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3007 gatt_client_t * gatt_client; 3008 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 3009 if (status != ERROR_CODE_SUCCESS){ 3010 return status; 3011 } 3012 3013 gatt_client->callback = callback; 3014 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE; 3015 gatt_client_run(); 3016 return ERROR_CODE_SUCCESS; 3017 } 3018 3019 void gatt_client_deserialize_service(const uint8_t *packet, int offset, gatt_client_service_t * service){ 3020 service->start_group_handle = little_endian_read_16(packet, offset); 3021 service->end_group_handle = little_endian_read_16(packet, offset + 2); 3022 reverse_128(&packet[offset + 4], service->uuid128); 3023 if (uuid_has_bluetooth_prefix(service->uuid128)){ 3024 service->uuid16 = big_endian_read_32(service->uuid128, 0); 3025 } else { 3026 service->uuid16 = 0; 3027 } 3028 } 3029 3030 void gatt_client_deserialize_characteristic(const uint8_t * packet, int offset, gatt_client_characteristic_t * characteristic){ 3031 characteristic->start_handle = little_endian_read_16(packet, offset); 3032 characteristic->value_handle = little_endian_read_16(packet, offset + 2); 3033 characteristic->end_handle = little_endian_read_16(packet, offset + 4); 3034 characteristic->properties = little_endian_read_16(packet, offset + 6); 3035 reverse_128(&packet[offset+8], characteristic->uuid128); 3036 if (uuid_has_bluetooth_prefix(characteristic->uuid128)){ 3037 characteristic->uuid16 = big_endian_read_32(characteristic->uuid128, 0); 3038 } else { 3039 characteristic->uuid16 = 0; 3040 } 3041 } 3042 3043 void gatt_client_deserialize_characteristic_descriptor(const uint8_t * packet, int offset, gatt_client_characteristic_descriptor_t * descriptor){ 3044 descriptor->handle = little_endian_read_16(packet, offset); 3045 reverse_128(&packet[offset+2], descriptor->uuid128); 3046 if (uuid_has_bluetooth_prefix(descriptor->uuid128)){ 3047 descriptor->uuid16 = big_endian_read_32(descriptor->uuid128, 0); 3048 } else { 3049 descriptor->uuid16 = 0; 3050 } 3051 } 3052 3053 void gatt_client_send_mtu_negotiation(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3054 gatt_client_t * gatt_client; 3055 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3056 if (status != ERROR_CODE_SUCCESS){ 3057 return; 3058 } 3059 if (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED){ 3060 gatt_client->callback = callback; 3061 gatt_client->mtu_state = SEND_MTU_EXCHANGE; 3062 gatt_client_run(); 3063 } 3064 } 3065 3066 uint8_t gatt_client_request_to_write_without_response(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 3067 gatt_client_t * gatt_client; 3068 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3069 if (status != ERROR_CODE_SUCCESS){ 3070 return status; 3071 } 3072 bool added = btstack_linked_list_add_tail(&gatt_client->write_without_response_requests, (btstack_linked_item_t*) callback_registration); 3073 if (added == false){ 3074 return ERROR_CODE_COMMAND_DISALLOWED; 3075 } else { 3076 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 3077 return ERROR_CODE_SUCCESS; 3078 } 3079 } 3080 3081 uint8_t gatt_client_request_to_send_gatt_query(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 3082 gatt_client_t * gatt_client; 3083 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3084 if (status != ERROR_CODE_SUCCESS){ 3085 return status; 3086 } 3087 bool added = btstack_linked_list_add_tail(&gatt_client->query_requests, (btstack_linked_item_t*) callback_registration); 3088 if (added == false){ 3089 return ERROR_CODE_COMMAND_DISALLOWED; 3090 } else { 3091 gatt_client_notify_can_send_query(gatt_client); 3092 return ERROR_CODE_SUCCESS; 3093 } 3094 } 3095 3096 uint8_t gatt_client_remove_gatt_query(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 3097 gatt_client_t * gatt_client; 3098 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3099 if (status != ERROR_CODE_SUCCESS){ 3100 return status; 3101 } 3102 (void)btstack_linked_list_remove(&gatt_client->query_requests, (btstack_linked_item_t*) callback_registration); 3103 return ERROR_CODE_SUCCESS; 3104 } 3105 3106 uint8_t gatt_client_request_can_write_without_response_event(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3107 gatt_client_t * gatt_client; 3108 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3109 if (status != ERROR_CODE_SUCCESS){ 3110 return status; 3111 } 3112 if (gatt_client->write_without_response_callback != NULL){ 3113 return GATT_CLIENT_IN_WRONG_STATE; 3114 } 3115 gatt_client->write_without_response_callback = callback; 3116 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 3117 return ERROR_CODE_SUCCESS; 3118 } 3119 3120 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 3121 void gatt_client_add_service_changed_handler(btstack_packet_callback_registration_t * callback) { 3122 btstack_linked_list_add_tail(&gatt_client_service_changed_handler, (btstack_linked_item_t*) callback); 3123 } 3124 3125 void gatt_client_remove_service_changed_handler(btstack_packet_callback_registration_t * callback){ 3126 btstack_linked_list_remove(&gatt_client_service_changed_handler, (btstack_linked_item_t*) callback); 3127 } 3128 #endif 3129 3130 #if defined(ENABLE_GATT_OVER_CLASSIC) || defined(ENABLE_GATT_OVER_EATT) 3131 3132 #include "hci_event.h" 3133 3134 static const hci_event_t gatt_client_connected = { 3135 GATT_EVENT_CONNECTED, 0, "11BH" 3136 }; 3137 3138 static const hci_event_t gatt_client_disconnected = { 3139 GATT_EVENT_DISCONNECTED, 0, "H" 3140 }; 3141 3142 static void 3143 gatt_client_emit_connected(btstack_packet_handler_t callback, uint8_t status, bd_addr_type_t addr_type, bd_addr_t addr, 3144 hci_con_handle_t con_handle) { 3145 uint8_t buffer[20]; 3146 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_connected, status, addr, con_handle); 3147 (*callback)(HCI_EVENT_PACKET, 0, buffer, len); 3148 } 3149 3150 #endif 3151 3152 #ifdef ENABLE_GATT_OVER_CLASSIC 3153 3154 #include "bluetooth_psm.h" 3155 3156 // single active SDP query 3157 static gatt_client_t * gatt_client_classic_active_sdp_query; 3158 3159 // macos protocol descriptor list requires 16 bytes 3160 static uint8_t gatt_client_classic_sdp_buffer[32]; 3161 3162 3163 static gatt_client_t * gatt_client_get_context_for_classic_addr(bd_addr_t addr){ 3164 btstack_linked_item_t *it; 3165 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 3166 gatt_client_t * gatt_client = (gatt_client_t *) it; 3167 if (memcmp(gatt_client->addr, addr, 6) == 0){ 3168 return gatt_client; 3169 } 3170 } 3171 return NULL; 3172 } 3173 3174 static gatt_client_t * gatt_client_get_context_for_l2cap_cid(uint16_t l2cap_cid){ 3175 btstack_linked_item_t *it; 3176 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 3177 gatt_client_t * gatt_client = (gatt_client_t *) it; 3178 if (gatt_client->l2cap_cid == l2cap_cid){ 3179 return gatt_client; 3180 } 3181 } 3182 return NULL; 3183 } 3184 3185 static void gatt_client_classic_handle_connected(gatt_client_t * gatt_client, uint8_t status){ 3186 // cache peer information 3187 bd_addr_t addr; 3188 // cppcheck-suppress uninitvar ; addr is reported as uninitialized although it's the destination of the memcpy 3189 memcpy(addr, gatt_client->addr, 6); 3190 bd_addr_type_t addr_type = gatt_client->addr_type; 3191 gatt_client->addr_type = BD_ADDR_TYPE_ACL; 3192 hci_con_handle_t con_handle = gatt_client->con_handle; 3193 btstack_packet_handler_t callback = gatt_client->callback; 3194 3195 if (status != ERROR_CODE_SUCCESS){ 3196 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 3197 btstack_memory_gatt_client_free(gatt_client); 3198 } 3199 3200 gatt_client_emit_connected(callback, status, addr_type, addr, con_handle); 3201 } 3202 3203 static void gatt_client_classic_retry(btstack_timer_source_t * ts){ 3204 gatt_client_t * gatt_client = gatt_client_for_timer(ts); 3205 if (gatt_client != NULL){ 3206 gatt_client->state = P_W4_L2CAP_CONNECTION; 3207 att_dispatch_classic_connect(gatt_client->addr, gatt_client->l2cap_psm, &gatt_client->l2cap_cid); 3208 } 3209 } 3210 3211 static void gatt_client_classic_handle_disconnected(gatt_client_t * gatt_client){ 3212 3213 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 3214 gatt_client_timeout_stop(gatt_client); 3215 3216 hci_con_handle_t con_handle = gatt_client->con_handle; 3217 btstack_packet_handler_t callback = gatt_client->callback; 3218 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 3219 btstack_memory_gatt_client_free(gatt_client); 3220 3221 uint8_t buffer[20]; 3222 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_disconnected, con_handle); 3223 (*callback)(HCI_EVENT_PACKET, 0, buffer, len); 3224 } 3225 3226 static void gatt_client_handle_sdp_client_query_attribute_value(gatt_client_t * connection, uint8_t *packet){ 3227 des_iterator_t des_list_it; 3228 des_iterator_t prot_it; 3229 3230 if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= sizeof(gatt_client_classic_sdp_buffer)) { 3231 gatt_client_classic_sdp_buffer[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); 3232 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)) { 3233 switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) { 3234 case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST: 3235 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)) { 3236 uint8_t *des_element; 3237 uint8_t *element; 3238 uint32_t uuid; 3239 3240 if (des_iterator_get_type(&des_list_it) != DE_DES) continue; 3241 3242 des_element = des_iterator_get_element(&des_list_it); 3243 des_iterator_init(&prot_it, des_element); 3244 element = des_iterator_get_element(&prot_it); 3245 3246 if (de_get_element_type(element) != DE_UUID) continue; 3247 3248 uuid = de_get_uuid32(element); 3249 des_iterator_next(&prot_it); 3250 // we assume that the even if there are both roles supported, remote device uses the same psm and avdtp version for both 3251 switch (uuid){ 3252 case BLUETOOTH_PROTOCOL_L2CAP: 3253 if (!des_iterator_has_more(&prot_it)) continue; 3254 de_element_get_uint16(des_iterator_get_element(&prot_it), &connection->l2cap_psm); 3255 break; 3256 default: 3257 break; 3258 } 3259 } 3260 break; 3261 3262 default: 3263 break; 3264 } 3265 } 3266 } 3267 } 3268 3269 static void gatt_client_classic_sdp_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 3270 gatt_client_t * gatt_client = gatt_client_classic_active_sdp_query; 3271 btstack_assert(gatt_client != NULL); 3272 uint8_t status; 3273 3274 // TODO: handle sdp events, get l2cap psm 3275 switch (hci_event_packet_get_type(packet)){ 3276 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: 3277 gatt_client_handle_sdp_client_query_attribute_value(gatt_client, packet); 3278 // TODO: 3279 return; 3280 case SDP_EVENT_QUERY_COMPLETE: 3281 status = sdp_event_query_complete_get_status(packet); 3282 gatt_client_classic_active_sdp_query = NULL; 3283 log_info("l2cap psm: %0x, status %02x", gatt_client->l2cap_psm, status); 3284 if (status != ERROR_CODE_SUCCESS) break; 3285 if (gatt_client->l2cap_psm == 0) { 3286 status = SDP_SERVICE_NOT_FOUND; 3287 break; 3288 } 3289 break; 3290 default: 3291 btstack_assert(false); 3292 return; 3293 } 3294 3295 // done 3296 if (status == ERROR_CODE_SUCCESS){ 3297 gatt_client->state = P_W4_L2CAP_CONNECTION; 3298 status = att_dispatch_classic_connect(gatt_client->addr, gatt_client->l2cap_psm, &gatt_client->l2cap_cid); 3299 } 3300 if (status != ERROR_CODE_SUCCESS) { 3301 gatt_client_classic_handle_connected(gatt_client, status); 3302 } 3303 } 3304 3305 static void gatt_client_classic_sdp_start(void * context){ 3306 gatt_client_classic_active_sdp_query = (gatt_client_t *) context; 3307 gatt_client_classic_active_sdp_query->state = P_W4_SDP_QUERY; 3308 sdp_client_query_uuid16(gatt_client_classic_sdp_handler, gatt_client_classic_active_sdp_query->addr, ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 3309 } 3310 3311 static void gatt_client_classic_emit_connected(void * context){ 3312 gatt_client_t * gatt_client = (gatt_client_t *) context; 3313 gatt_client->state = P_READY; 3314 gatt_client_emit_connected(gatt_client->callback, ERROR_CODE_SUCCESS, gatt_client->addr_type, gatt_client->addr, gatt_client->con_handle); 3315 } 3316 3317 uint8_t gatt_client_classic_connect(btstack_packet_handler_t callback, bd_addr_t addr){ 3318 gatt_client_t * gatt_client = gatt_client_get_context_for_classic_addr(addr); 3319 if (gatt_client != NULL){ 3320 return ERROR_CODE_ACL_CONNECTION_ALREADY_EXISTS; 3321 } 3322 gatt_client = btstack_memory_gatt_client_get(); 3323 if (gatt_client == NULL){ 3324 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 3325 } 3326 // init state 3327 gatt_client->bearer_type = ATT_BEARER_UNENHANCED_CLASSIC; 3328 gatt_client->con_handle = HCI_CON_HANDLE_INVALID; 3329 memcpy(gatt_client->addr, addr, 6); 3330 gatt_client->addr_type = BD_ADDR_TYPE_ACL; 3331 gatt_client->mtu = ATT_DEFAULT_MTU; 3332 gatt_client->security_level = LEVEL_0; 3333 gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 3334 gatt_client->callback = callback; 3335 #ifdef ENABLE_GATT_OVER_EATT 3336 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3337 #endif 3338 btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); 3339 3340 // schedule emitted event if already connected, otherwise 3341 bool already_connected = false; 3342 hci_connection_t * hci_connection = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL); 3343 if (hci_connection != NULL){ 3344 if (hci_connection->att_server.l2cap_cid != 0){ 3345 already_connected = true; 3346 } 3347 } 3348 gatt_client->callback_request.context = gatt_client; 3349 if (already_connected){ 3350 gatt_client->con_handle = hci_connection->con_handle; 3351 gatt_client->callback_request.callback = &gatt_client_classic_emit_connected; 3352 gatt_client->state = P_W2_EMIT_CONNECTED; 3353 btstack_run_loop_execute_on_main_thread(&gatt_client->callback_request); 3354 } else { 3355 gatt_client->callback_request.callback = &gatt_client_classic_sdp_start; 3356 gatt_client->state = P_W2_SDP_QUERY; 3357 sdp_client_register_query_callback(&gatt_client->callback_request); 3358 } 3359 return ERROR_CODE_SUCCESS; 3360 } 3361 3362 uint8_t gatt_client_classic_disconnect(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3363 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 3364 if (gatt_client == NULL){ 3365 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 3366 } 3367 gatt_client->callback = callback; 3368 return l2cap_disconnect(gatt_client->l2cap_cid); 3369 } 3370 #endif 3371 3372 #ifdef ENABLE_GATT_OVER_EATT 3373 3374 #define MAX_NR_EATT_CHANNELS 5 3375 3376 static void gatt_client_le_enhanced_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 3377 3378 static uint8_t gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client_t * gatt_client, gatt_client_state_t state){ 3379 uint8_t num_clients = 0; 3380 btstack_linked_list_iterator_t it; 3381 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 3382 while (btstack_linked_list_iterator_has_next(&it)){ 3383 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3384 if (eatt_client->state == state){ 3385 num_clients++; 3386 } 3387 } 3388 return num_clients; 3389 } 3390 3391 static void gatt_client_eatt_finalize(gatt_client_t * gatt_client) { 3392 // free eatt clients 3393 btstack_linked_list_iterator_t it; 3394 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3395 while (btstack_linked_list_iterator_has_next(&it)) { 3396 gatt_client_t *eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3397 btstack_linked_list_iterator_remove(&it); 3398 btstack_memory_gatt_client_free(eatt_client); 3399 } 3400 } 3401 3402 // all channels connected 3403 static void gatt_client_le_enhanced_handle_connected(gatt_client_t * gatt_client, uint8_t status) { 3404 if (status == ERROR_CODE_SUCCESS){ 3405 uint8_t num_ready = gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client, P_READY); 3406 if (num_ready > 0){ 3407 gatt_client->eatt_state = GATT_CLIENT_EATT_READY; 3408 // free unused channels 3409 btstack_linked_list_iterator_t it; 3410 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3411 while (btstack_linked_list_iterator_has_next(&it)) { 3412 gatt_client_t *eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3413 if (eatt_client->state == P_L2CAP_CLOSED){ 3414 btstack_linked_list_iterator_remove(&it); 3415 btstack_memory_gatt_client_free(eatt_client); 3416 } 3417 } 3418 } else { 3419 hci_connection_t * hci_connection = hci_connection_for_handle(gatt_client->con_handle); 3420 btstack_assert(hci_connection != NULL); 3421 if (hci_connection->att_server.incoming_connection_request){ 3422 hci_connection->att_server.incoming_connection_request = false; 3423 log_info("Collision, retry in 100ms"); 3424 gatt_client->state = P_W2_L2CAP_CONNECT; 3425 // set timer for retry 3426 btstack_run_loop_set_timer(&gatt_client->gc_timeout, GATT_CLIENT_COLLISION_BACKOFF_MS); 3427 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_le_enhanced_retry); 3428 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 3429 return; 3430 } else { 3431 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3432 status = ERROR_CODE_CONNECTION_REJECTED_DUE_TO_LIMITED_RESOURCES; 3433 } 3434 } 3435 } else { 3436 gatt_client_eatt_finalize(gatt_client); 3437 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3438 } 3439 3440 gatt_client_emit_connected(gatt_client->callback, status, gatt_client->addr_type, gatt_client->addr, gatt_client->con_handle); 3441 } 3442 3443 // single channel disconnected 3444 static void gatt_client_le_enhanced_handle_ecbm_disconnected(gatt_client_t * gatt_client, gatt_client_t * eatt_client) { 3445 3446 // report error 3447 gatt_client_report_error_if_pending(eatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 3448 3449 // free memory 3450 btstack_linked_list_remove(&gatt_client->eatt_clients, (btstack_linked_item_t *) eatt_client); 3451 btstack_memory_gatt_client_free(eatt_client); 3452 3453 // last channel 3454 if (btstack_linked_list_empty(&gatt_client->eatt_clients)){ 3455 hci_connection_t * hci_connection = hci_connection_for_handle(gatt_client->con_handle); 3456 hci_connection->att_server.eatt_outgoing_active = false; 3457 3458 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY) { 3459 // report disconnected if last channel closed 3460 uint8_t buffer[20]; 3461 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_disconnected, gatt_client->con_handle); 3462 (*gatt_client->callback)(HCI_EVENT_PACKET, 0, buffer, len); 3463 } 3464 } 3465 } 3466 3467 static gatt_client_t * gatt_client_le_enhanced_get_context_for_l2cap_cid(uint16_t l2cap_cid, gatt_client_t ** out_eatt_client){ 3468 btstack_linked_list_iterator_t it; 3469 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3470 while (btstack_linked_list_iterator_has_next(&it)) { 3471 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3472 btstack_linked_list_iterator_t it2; 3473 btstack_linked_list_iterator_init(&it2, &gatt_client->eatt_clients); 3474 while (btstack_linked_list_iterator_has_next(&it2)) { 3475 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it2); 3476 if (eatt_client->l2cap_cid == l2cap_cid){ 3477 *out_eatt_client = eatt_client; 3478 return gatt_client; 3479 } 3480 } 3481 } 3482 return NULL; 3483 } 3484 3485 static void gatt_client_le_enhanced_setup_l2cap_channel(gatt_client_t * gatt_client){ 3486 uint8_t num_channels = gatt_client->eatt_num_clients; 3487 3488 // setup channels 3489 uint16_t buffer_size_per_client = gatt_client->eatt_storage_size / num_channels; 3490 uint16_t max_mtu = (buffer_size_per_client - REPORT_PREBUFFER_HEADER) / 2; 3491 uint8_t * receive_buffers[MAX_NR_EATT_CHANNELS]; 3492 uint16_t new_cids[MAX_NR_EATT_CHANNELS]; 3493 memset(gatt_client->eatt_storage_buffer, 0, gatt_client->eatt_storage_size); 3494 uint8_t i; 3495 for (i=0;i<gatt_client->eatt_num_clients; i++){ 3496 receive_buffers[i] = &gatt_client->eatt_storage_buffer[REPORT_PREBUFFER_HEADER]; 3497 gatt_client->eatt_storage_buffer += REPORT_PREBUFFER_HEADER + max_mtu; 3498 } 3499 3500 log_info("%u EATT clients with receive buffer size %u", gatt_client->eatt_num_clients, buffer_size_per_client); 3501 3502 uint8_t status = l2cap_ecbm_create_channels(&gatt_client_le_enhanced_packet_handler, 3503 gatt_client->con_handle, 3504 gatt_client->security_level, 3505 BLUETOOTH_PSM_EATT, num_channels, 3506 L2CAP_LE_AUTOMATIC_CREDITS, 3507 buffer_size_per_client, 3508 receive_buffers, 3509 new_cids); 3510 3511 if (status == ERROR_CODE_SUCCESS){ 3512 i = 0; 3513 btstack_linked_list_iterator_t it; 3514 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 3515 while (btstack_linked_list_iterator_has_next(&it)) { 3516 gatt_client_t *new_eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3517 3518 // init state with new cid and transmit buffer 3519 new_eatt_client->bearer_type = ATT_BEARER_ENHANCED_LE; 3520 new_eatt_client->con_handle = gatt_client->con_handle; 3521 new_eatt_client->mtu = 64; 3522 new_eatt_client->security_level = LEVEL_0; 3523 new_eatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 3524 new_eatt_client->state = P_W4_L2CAP_CONNECTION; 3525 new_eatt_client->l2cap_cid = new_cids[i]; 3526 new_eatt_client->eatt_storage_buffer = gatt_client->eatt_storage_buffer; 3527 gatt_client->eatt_storage_buffer += max_mtu; 3528 i++; 3529 } 3530 gatt_client->eatt_state = GATT_CLIENT_EATT_L2CAP_SETUP; 3531 } else { 3532 gatt_client_le_enhanced_handle_connected(gatt_client, status); 3533 } 3534 } 3535 3536 static void gatt_client_le_enhanced_retry(btstack_timer_source_t * ts){ 3537 gatt_client_t * gatt_client = gatt_client_for_timer(ts); 3538 if (gatt_client != NULL){ 3539 gatt_client->state = P_W4_L2CAP_CONNECTION; 3540 gatt_client_le_enhanced_setup_l2cap_channel(gatt_client); 3541 } 3542 } 3543 3544 static void gatt_client_le_enhanced_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) { 3545 gatt_client_t *gatt_client; 3546 gatt_client_t *eatt_client; 3547 hci_con_handle_t con_handle; 3548 uint16_t l2cap_cid; 3549 uint8_t status; 3550 gatt_client_characteristic_t characteristic; 3551 gatt_client_service_t service; 3552 switch (packet_type) { 3553 case HCI_EVENT_PACKET: 3554 switch (hci_event_packet_get_type(packet)) { 3555 case GATT_EVENT_SERVICE_QUERY_RESULT: 3556 con_handle = gatt_event_service_query_result_get_handle(packet); 3557 gatt_client = gatt_client_get_context_for_handle(con_handle); 3558 btstack_assert(gatt_client != NULL); 3559 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE); 3560 gatt_event_service_query_result_get_service(packet, &service); 3561 gatt_client->gatt_service_start_group_handle = service.start_group_handle; 3562 gatt_client->gatt_service_end_group_handle = service.end_group_handle; 3563 break; 3564 case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: 3565 con_handle = gatt_event_characteristic_value_query_result_get_handle(packet); 3566 gatt_client = gatt_client_get_context_for_handle(con_handle); 3567 btstack_assert(gatt_client != NULL); 3568 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE); 3569 if (gatt_event_characteristic_value_query_result_get_value_length(packet) >= 1) { 3570 gatt_client->gatt_server_supported_features = gatt_event_characteristic_value_query_result_get_value(packet)[0]; 3571 } 3572 break; 3573 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 3574 con_handle = gatt_event_characteristic_query_result_get_handle(packet); 3575 gatt_client = gatt_client_get_context_for_handle(con_handle); 3576 btstack_assert(gatt_client != NULL); 3577 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE); 3578 gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic); 3579 gatt_client->gatt_client_supported_features_handle = characteristic.value_handle; 3580 break; 3581 case GATT_EVENT_QUERY_COMPLETE: 3582 con_handle = gatt_event_query_complete_get_handle(packet); 3583 gatt_client = gatt_client_get_context_for_handle(con_handle); 3584 btstack_assert(gatt_client != NULL); 3585 switch (gatt_client->eatt_state){ 3586 case GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE: 3587 if (gatt_client->gatt_service_start_group_handle == 0){ 3588 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3589 } else { 3590 gatt_client->eatt_state = GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W2_SEND; 3591 } 3592 break; 3593 case GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE: 3594 if ((gatt_client->gatt_server_supported_features & 1) == 0) { 3595 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3596 } else { 3597 gatt_client->eatt_state = GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W2_SEND; 3598 } 3599 break; 3600 case GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE: 3601 if (gatt_client->gatt_client_supported_features_handle == 0){ 3602 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3603 } else { 3604 gatt_client->eatt_state = GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W2_SEND; 3605 } 3606 break; 3607 case GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W4_DONE: 3608 gatt_client_le_enhanced_setup_l2cap_channel(gatt_client); 3609 break; 3610 default: 3611 break; 3612 } 3613 break; 3614 case L2CAP_EVENT_ECBM_CHANNEL_OPENED: 3615 l2cap_cid = l2cap_event_ecbm_channel_opened_get_local_cid(packet); 3616 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(l2cap_cid, &eatt_client); 3617 3618 btstack_assert(gatt_client != NULL); 3619 btstack_assert(eatt_client != NULL); 3620 btstack_assert(eatt_client->state == P_W4_L2CAP_CONNECTION); 3621 3622 status = l2cap_event_channel_opened_get_status(packet); 3623 if (status == ERROR_CODE_SUCCESS){ 3624 eatt_client->state = P_READY; 3625 eatt_client->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); 3626 } else { 3627 eatt_client->state = P_L2CAP_CLOSED; 3628 } 3629 // connected if opened event for all channels received 3630 if (gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client, P_W4_L2CAP_CONNECTION) == 0){ 3631 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_SUCCESS); 3632 } 3633 break; 3634 case L2CAP_EVENT_CHANNEL_CLOSED: 3635 l2cap_cid = l2cap_event_channel_closed_get_local_cid(packet); 3636 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(l2cap_cid, &eatt_client); 3637 btstack_assert(gatt_client != NULL); 3638 btstack_assert(eatt_client != NULL); 3639 gatt_client_le_enhanced_handle_ecbm_disconnected(gatt_client, eatt_client); 3640 break; 3641 default: 3642 break; 3643 } 3644 break; 3645 case L2CAP_DATA_PACKET: 3646 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(channel, &eatt_client); 3647 btstack_assert(gatt_client != NULL); 3648 btstack_assert(eatt_client != NULL); 3649 gatt_client_handle_att_response(eatt_client, packet, size); 3650 gatt_client_run(); 3651 break; 3652 default: 3653 break; 3654 } 3655 } 3656 3657 static bool gatt_client_le_enhanced_handle_can_send_query(gatt_client_t * gatt_client){ 3658 uint8_t status = ERROR_CODE_SUCCESS; 3659 uint8_t gatt_client_supported_features = 0x06; // eatt + multiple value notifications 3660 switch (gatt_client->eatt_state){ 3661 case GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W2_SEND: 3662 gatt_client->gatt_service_start_group_handle = 0; 3663 gatt_client->eatt_state = GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE; 3664 status = gatt_client_discover_primary_services_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3665 gatt_client->con_handle, 3666 ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 3667 break; 3668 case GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W2_SEND: 3669 gatt_client->gatt_server_supported_features = 0; 3670 gatt_client->eatt_state = GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE; 3671 status = gatt_client_read_value_of_characteristics_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3672 gatt_client->con_handle, 3673 gatt_client->gatt_service_start_group_handle, 3674 gatt_client->gatt_service_end_group_handle, 3675 ORG_BLUETOOTH_CHARACTERISTIC_SERVER_SUPPORTED_FEATURES); 3676 return true; 3677 case GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W2_SEND: 3678 gatt_client->gatt_client_supported_features_handle = 0; 3679 gatt_client->eatt_state = GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE; 3680 status = gatt_client_discover_characteristics_for_handle_range_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3681 gatt_client->con_handle, 3682 gatt_client->gatt_service_start_group_handle, 3683 gatt_client->gatt_service_end_group_handle, 3684 ORG_BLUETOOTH_CHARACTERISTIC_CLIENT_SUPPORTED_FEATURES); 3685 return true; 3686 case GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W2_SEND: 3687 gatt_client->eatt_state = GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W4_DONE; 3688 status = gatt_client_write_value_of_characteristic(&gatt_client_le_enhanced_packet_handler, gatt_client->con_handle, 3689 gatt_client->gatt_client_supported_features_handle, 1, 3690 &gatt_client_supported_features); 3691 return true; 3692 default: 3693 break; 3694 } 3695 btstack_assert(status == ERROR_CODE_SUCCESS); 3696 UNUSED(status); 3697 return false; 3698 } 3699 3700 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) { 3701 gatt_client_t * gatt_client; 3702 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3703 if (status != ERROR_CODE_SUCCESS){ 3704 return status; 3705 } 3706 3707 if (gatt_client->eatt_state != GATT_CLIENT_EATT_IDLE){ 3708 return ERROR_CODE_COMMAND_DISALLOWED; 3709 } 3710 3711 // need one buffer for sending and one for receiving. Receiving includes pre-buffer for reports 3712 uint16_t buffer_size_per_client = storage_size / num_channels; 3713 uint16_t max_mtu = (buffer_size_per_client - REPORT_PREBUFFER_HEADER) / 2; 3714 if (max_mtu < 64) { 3715 return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS; 3716 } 3717 3718 if ((num_channels == 0) || (num_channels > MAX_NR_EATT_CHANNELS)){ 3719 return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS; 3720 } 3721 3722 // create max num_channel eatt clients 3723 uint8_t i; 3724 btstack_linked_list_t eatt_clients = NULL; 3725 for (i=0;i<num_channels;i++) { 3726 gatt_client_t * new_gatt_client = btstack_memory_gatt_client_get(); 3727 if (new_gatt_client == NULL) { 3728 break; 3729 } 3730 btstack_linked_list_add(&eatt_clients, (btstack_linked_item_t*)new_gatt_client); 3731 } 3732 3733 if (i != num_channels){ 3734 while (true){ 3735 gatt_client = (gatt_client_t *) btstack_linked_list_pop(&eatt_clients); 3736 if (gatt_client == NULL) { 3737 break; 3738 } 3739 btstack_memory_gatt_client_free(gatt_client); 3740 } 3741 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 3742 } 3743 3744 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 3745 hci_connection->att_server.eatt_outgoing_active = true; 3746 3747 gatt_client->callback = callback; 3748 gatt_client->eatt_num_clients = num_channels; 3749 gatt_client->eatt_storage_buffer = storage_buffer; 3750 gatt_client->eatt_storage_size = storage_size; 3751 gatt_client->eatt_clients = eatt_clients; 3752 gatt_client->eatt_state = GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W2_SEND; 3753 gatt_client_notify_can_send_query(gatt_client); 3754 3755 return ERROR_CODE_SUCCESS; 3756 } 3757 3758 #endif 3759 3760 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 3761 void gatt_client_att_packet_handler_fuzz(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 3762 gatt_client_att_packet_handler(packet_type, handle, packet, size); 3763 } 3764 3765 uint8_t gatt_client_get_client(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 3766 uint8_t status = gatt_client_provide_context_for_handle(con_handle, out_gatt_client); 3767 return status; 3768 } 3769 #endif 3770