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 HX 951 uint8_t packet[24]; 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, start_group_handle); 956 hci_event_builder_add_16(&context, end_group_handle); 957 hci_event_builder_add_128(&context, uuid128); 958 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 959 } 960 961 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){ 962 // @format HX 963 uint8_t packet[26]; 964 hci_event_builder_context_t context; 965 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_INCLUDED_SERVICE_QUERY_RESULT, 0); 966 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 967 hci_event_builder_add_16(&context, include_handle); 968 hci_event_builder_add_16(&context, start_group_handle); 969 hci_event_builder_add_16(&context, end_group_handle); 970 hci_event_builder_add_128(&context, uuid128); 971 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 972 } 973 974 static void emit_gatt_characteristic_query_result_event(gatt_client_t * gatt_client, uint16_t start_handle, uint16_t value_handle, uint16_t end_handle, 975 uint16_t properties, const uint8_t * uuid128){ 976 // @format HY 977 uint8_t packet[28]; 978 hci_event_builder_context_t context; 979 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_CHARACTERISTIC_QUERY_RESULT, 0); 980 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 981 hci_event_builder_add_16(&context, start_handle); 982 hci_event_builder_add_16(&context, value_handle); 983 hci_event_builder_add_16(&context, end_handle); 984 hci_event_builder_add_16(&context, properties); 985 hci_event_builder_add_128(&context, uuid128); 986 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 987 } 988 989 static void emit_gatt_all_characteristic_descriptors_result_event( 990 gatt_client_t * gatt_client, uint16_t descriptor_handle, const uint8_t * uuid128){ 991 // @format HZ 992 uint8_t packet[22]; 993 hci_event_builder_context_t context; 994 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT, 0); 995 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 996 hci_event_builder_add_16(&context, descriptor_handle); 997 hci_event_builder_add_128(&context, uuid128); 998 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 999 } 1000 1001 static void emit_gatt_mtu_exchanged_result_event(gatt_client_t * gatt_client, uint16_t new_mtu){ 1002 // @format H2 1003 uint8_t packet[6]; 1004 packet[0] = GATT_EVENT_MTU; 1005 packet[1] = sizeof(packet) - 2u; 1006 little_endian_store_16(packet, 2, gatt_client->con_handle); 1007 little_endian_store_16(packet, 4, new_mtu); 1008 att_dispatch_client_mtu_exchanged(gatt_client->con_handle, new_mtu); 1009 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 1010 } 1011 1012 // helper 1013 static void gatt_client_handle_transaction_complete(gatt_client_t *gatt_client, uint8_t att_status) { 1014 gatt_client->state = P_READY; 1015 gatt_client_timeout_stop(gatt_client); 1016 emit_gatt_complete_event(gatt_client, att_status); 1017 gatt_client_notify_can_send_query(gatt_client); 1018 } 1019 1020 // @return packet pointer 1021 // @note assume that value is part of an l2cap buffer - overwrite HCI + L2CAP packet headers 1022 #define CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 8 1023 static uint8_t * 1024 setup_characteristic_value_packet(const gatt_client_t *gatt_client, uint8_t type, uint16_t attribute_handle, 1025 uint8_t *value, uint16_t length) { 1026 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 1027 // copy value into test packet for testing 1028 static uint8_t packet[1000]; 1029 memcpy(&packet[CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE], value, length); 1030 #else 1031 // before the value inside the ATT PDU 1032 uint8_t * packet = value - CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE; 1033 #endif 1034 packet[0] = type; 1035 packet[1] = CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 2 + length; 1036 little_endian_store_16(packet, 2, gatt_client->con_handle); 1037 little_endian_store_16(packet, 4, attribute_handle); 1038 little_endian_store_16(packet, 6, length); 1039 return packet; 1040 } 1041 1042 // @return packet pointer 1043 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1044 #define LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 10 1045 1046 // L2CAP Header (4) + ACL Header (4) => 8 bytes 1047 #if !defined(HCI_INCOMING_PRE_BUFFER_SIZE) || ((HCI_INCOMING_PRE_BUFFER_SIZE < LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 8)) 1048 #error "Long Characteristic reads requires HCI_INCOMING_PRE_BUFFER_SIZE >= 2" 1049 #endif 1050 1051 static uint8_t * 1052 setup_long_characteristic_value_packet(const gatt_client_t *gatt_client, uint8_t type, uint16_t attribute_handle, 1053 uint16_t offset, uint8_t *value, uint16_t length) { 1054 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 1055 // avoid using pre ATT headers. 1056 // copy value into test packet for testing 1057 static uint8_t packet[1000]; 1058 memcpy(&packet[LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE], value, length); 1059 #else 1060 // before the value inside the ATT PDU 1061 uint8_t * packet = value - LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE; 1062 #endif 1063 packet[0] = type; 1064 packet[1] = LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 2 + length; 1065 little_endian_store_16(packet, 2, gatt_client->con_handle); 1066 little_endian_store_16(packet, 4, attribute_handle); 1067 little_endian_store_16(packet, 6, offset); 1068 little_endian_store_16(packet, 8, length); 1069 return packet; 1070 } 1071 1072 #if (LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE > CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE) 1073 #define REPORT_PREBUFFER_HEADER LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 1074 #else 1075 #define REPORT_PREBUFFER_HEADER CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 1076 #endif 1077 1078 /// 1079 static void report_gatt_services(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 1080 if (size < 2) return; 1081 uint8_t attr_length = packet[1]; 1082 uint8_t uuid_length = attr_length - 4u; 1083 1084 int i; 1085 for (i = 2; (i+attr_length) <= size; i += attr_length){ 1086 uint16_t start_group_handle = little_endian_read_16(packet,i); 1087 uint16_t end_group_handle = little_endian_read_16(packet,i+2); 1088 uint8_t uuid128[16]; 1089 uint16_t uuid16 = 0; 1090 1091 if (uuid_length == 2u){ 1092 uuid16 = little_endian_read_16(packet, i+4); 1093 uuid_add_bluetooth_prefix((uint8_t*) &uuid128, uuid16); 1094 } else if (uuid_length == 16u) { 1095 reverse_128(&packet[i+4], uuid128); 1096 } else { 1097 return; 1098 } 1099 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, uuid128); 1100 } 1101 } 1102 1103 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){ 1104 uint8_t uuid128[16]; 1105 uint16_t uuid16 = 0; 1106 if (uuid_length == 2u){ 1107 uuid16 = little_endian_read_16(uuid, 0); 1108 uuid_add_bluetooth_prefix((uint8_t*) uuid128, uuid16); 1109 } else if (uuid_length == 16u){ 1110 reverse_128(uuid, uuid128); 1111 } else { 1112 return; 1113 } 1114 1115 if (gatt_client->filter_with_uuid && (memcmp(gatt_client->uuid128, uuid128, 16) != 0)) return; 1116 1117 gatt_client->characteristic_properties = properties; 1118 gatt_client->characteristic_start_handle = start_handle; 1119 gatt_client->attribute_handle = value_handle; 1120 1121 if (gatt_client->filter_with_uuid) return; 1122 1123 gatt_client->uuid16 = uuid16; 1124 (void)memcpy(gatt_client->uuid128, uuid128, 16); 1125 } 1126 1127 static void report_gatt_characteristic_end_found(gatt_client_t * gatt_client, uint16_t end_handle){ 1128 // TODO: stop searching if filter and uuid found 1129 1130 if (!gatt_client->characteristic_start_handle) return; 1131 1132 emit_gatt_characteristic_query_result_event(gatt_client, gatt_client->characteristic_start_handle, gatt_client->attribute_handle, 1133 end_handle, gatt_client->characteristic_properties, gatt_client->uuid128); 1134 1135 gatt_client->characteristic_start_handle = 0; 1136 } 1137 1138 1139 static void report_gatt_characteristics(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 1140 if (size < 2u) return; 1141 uint8_t attr_length = packet[1]; 1142 if ((attr_length != 7u) && (attr_length != 21u)) return; 1143 uint8_t uuid_length = attr_length - 5u; 1144 int i; 1145 for (i = 2u; (i + attr_length) <= size; i += attr_length){ 1146 uint16_t start_handle = little_endian_read_16(packet, i); 1147 uint8_t properties = packet[i+2]; 1148 uint16_t value_handle = little_endian_read_16(packet, i+3); 1149 report_gatt_characteristic_end_found(gatt_client, start_handle - 1u); 1150 report_gatt_characteristic_start_found(gatt_client, start_handle, properties, value_handle, &packet[i + 5], 1151 uuid_length); 1152 } 1153 } 1154 1155 static void report_gatt_included_service_uuid16(gatt_client_t * gatt_client, uint16_t include_handle, uint16_t uuid16){ 1156 uint8_t normalized_uuid128[16]; 1157 uuid_add_bluetooth_prefix(normalized_uuid128, uuid16); 1158 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 1159 gatt_client->query_end_handle, normalized_uuid128); 1160 } 1161 1162 static void report_gatt_included_service_uuid128(gatt_client_t * gatt_client, uint16_t include_handle, const uint8_t * uuid128){ 1163 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 1164 gatt_client->query_end_handle, uuid128); 1165 } 1166 1167 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1168 static void report_gatt_notification(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { 1169 if (!gatt_client_accept_server_message(gatt_client)) return; 1170 uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_NOTIFICATION, value_handle, 1171 value, length); 1172 emit_event_to_registered_listeners(gatt_client->con_handle, value_handle, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 1173 } 1174 1175 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1176 static void report_gatt_indication(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { 1177 if (!gatt_client_accept_server_message(gatt_client)) return; 1178 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 1179 // Directly Handle GATT Service Changed and Database Hash indications 1180 if (value_handle == gatt_client->gatt_service_database_hash_value_handle){ 1181 gatt_client_service_emit_database_hash(gatt_client, value, length); 1182 } 1183 if (value_handle == gatt_client->gatt_service_changed_value_handle){ 1184 gatt_client_service_emit_service_changed(gatt_client, value, length); 1185 } 1186 #endif 1187 uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_INDICATION, value_handle, 1188 value, length); 1189 emit_event_to_registered_listeners(gatt_client->con_handle, value_handle, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 1190 } 1191 1192 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1193 static void report_gatt_characteristic_value(gatt_client_t * gatt_client, uint16_t attribute_handle, uint8_t * value, uint16_t length){ 1194 uint8_t * packet = setup_characteristic_value_packet( 1195 gatt_client, GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT, attribute_handle, value, length); 1196 emit_event_new(gatt_client->callback, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 1197 } 1198 1199 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1200 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){ 1201 uint8_t * packet = setup_long_characteristic_value_packet(gatt_client, 1202 GATT_EVENT_LONG_CHARACTERISTIC_VALUE_QUERY_RESULT, 1203 attribute_handle, value_offset, 1204 blob, blob_length); 1205 emit_event_new(gatt_client->callback, packet, blob_length + LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE); 1206 } 1207 1208 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){ 1209 UNUSED(value_offset); 1210 uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, 1211 descriptor_handle, value, 1212 value_length); 1213 emit_event_new(gatt_client->callback, packet, value_length + 8u); 1214 } 1215 1216 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){ 1217 uint8_t * packet = setup_long_characteristic_value_packet(gatt_client, 1218 GATT_EVENT_LONG_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, 1219 descriptor_handle, value_offset, 1220 blob, blob_length); 1221 emit_event_new(gatt_client->callback, packet, blob_length + LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE); 1222 } 1223 1224 static void report_gatt_all_characteristic_descriptors(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size, uint16_t pair_size){ 1225 int i; 1226 for (i = 0u; (i + pair_size) <= size; i += pair_size){ 1227 uint16_t descriptor_handle = little_endian_read_16(packet,i); 1228 uint8_t uuid128[16]; 1229 uint16_t uuid16 = 0; 1230 if (pair_size == 4u){ 1231 uuid16 = little_endian_read_16(packet,i+2); 1232 uuid_add_bluetooth_prefix(uuid128, uuid16); 1233 } else { 1234 reverse_128(&packet[i+2], uuid128); 1235 } 1236 emit_gatt_all_characteristic_descriptors_result_event(gatt_client, descriptor_handle, uuid128); 1237 } 1238 1239 } 1240 1241 static bool is_query_done(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1242 return last_result_handle >= gatt_client->end_group_handle; 1243 } 1244 1245 static void trigger_next_query(gatt_client_t * gatt_client, uint16_t last_result_handle, gatt_client_state_t next_query_state){ 1246 if (is_query_done(gatt_client, last_result_handle)){ 1247 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1248 return; 1249 } 1250 // next 1251 gatt_client->start_group_handle = last_result_handle + 1u; 1252 gatt_client->state = next_query_state; 1253 } 1254 1255 static void trigger_next_included_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1256 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_INCLUDED_SERVICE_QUERY); 1257 } 1258 1259 static void trigger_next_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1260 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_QUERY); 1261 } 1262 1263 static void trigger_next_service_by_uuid_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1264 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_WITH_UUID_QUERY); 1265 } 1266 1267 static void trigger_next_characteristic_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1268 if (is_query_done(gatt_client, last_result_handle)){ 1269 // report last characteristic 1270 report_gatt_characteristic_end_found(gatt_client, gatt_client->end_group_handle); 1271 } 1272 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY); 1273 } 1274 1275 static void trigger_next_characteristic_descriptor_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1276 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY); 1277 } 1278 1279 static void trigger_next_read_by_type_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1280 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_READ_BY_TYPE_REQUEST); 1281 } 1282 1283 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){ 1284 gatt_client->attribute_offset += write_blob_length(gatt_client); 1285 uint16_t next_blob_length = write_blob_length(gatt_client); 1286 1287 if (next_blob_length == 0u){ 1288 gatt_client->state = done_state; 1289 return; 1290 } 1291 gatt_client->state = next_query_state; 1292 } 1293 1294 static void trigger_next_blob_query(gatt_client_t * gatt_client, gatt_client_state_t next_query_state, uint16_t received_blob_length){ 1295 1296 uint16_t max_blob_length = gatt_client->mtu - 1u; 1297 if (received_blob_length < max_blob_length){ 1298 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1299 return; 1300 } 1301 1302 gatt_client->attribute_offset += received_blob_length; 1303 gatt_client->state = next_query_state; 1304 } 1305 1306 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){ 1307 notification->callback = callback; 1308 notification->con_handle = con_handle; 1309 if (characteristic == NULL){ 1310 notification->attribute_handle = GATT_CLIENT_ANY_VALUE_HANDLE; 1311 } else { 1312 notification->attribute_handle = characteristic->value_handle; 1313 } 1314 btstack_linked_list_add(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 1315 } 1316 1317 void gatt_client_stop_listening_for_characteristic_value_updates(gatt_client_notification_t * notification){ 1318 btstack_linked_list_remove(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 1319 } 1320 1321 static bool is_value_valid(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size){ 1322 uint16_t attribute_handle = little_endian_read_16(packet, 1); 1323 uint16_t value_offset = little_endian_read_16(packet, 3); 1324 1325 if (gatt_client->attribute_handle != attribute_handle) return false; 1326 if (gatt_client->attribute_offset != value_offset) return false; 1327 return memcmp(&gatt_client->attribute_value[gatt_client->attribute_offset], &packet[5], size - 5u) == 0u; 1328 } 1329 1330 #ifdef ENABLE_LE_SIGNED_WRITE 1331 static void gatt_client_run_for_client_start_signed_write(gatt_client_t *gatt_client) { 1332 sm_key_t csrk; 1333 le_device_db_local_csrk_get(gatt_client->le_device_index, csrk); 1334 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 1335 gatt_client->state = P_W4_CMAC_RESULT; 1336 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); 1337 } 1338 #endif 1339 1340 // returns true if packet was sent 1341 static bool gatt_client_run_for_gatt_client(gatt_client_t * gatt_client){ 1342 1343 // wait until re-encryption is complete 1344 if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return false; 1345 1346 // wait until re-encryption is complete 1347 if (gatt_client->reencryption_active) return false; 1348 1349 // wait until pairing complete (either reactive authentication or due to required security level) 1350 if (gatt_client->wait_for_authentication_complete) return false; 1351 1352 bool client_request_pending = gatt_client->state != P_READY; 1353 1354 // verify security level for Mandatory Authentication over LE 1355 bool check_security; 1356 switch (gatt_client->bearer_type){ 1357 case ATT_BEARER_UNENHANCED_LE: 1358 check_security = true; 1359 break; 1360 default: 1361 check_security = false; 1362 break; 1363 } 1364 if (client_request_pending && (gatt_client_required_security_level > gatt_client->security_level) && check_security){ 1365 log_info("Trigger pairing, current security level %u, required %u\n", gatt_client->security_level, gatt_client_required_security_level); 1366 gatt_client->wait_for_authentication_complete = true; 1367 // set att error code for pairing failure based on required level 1368 switch (gatt_client_required_security_level){ 1369 case LEVEL_4: 1370 case LEVEL_3: 1371 gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_AUTHENTICATION; 1372 break; 1373 default: 1374 gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_ENCRYPTION; 1375 break; 1376 } 1377 sm_request_pairing(gatt_client->con_handle); 1378 // sm probably just sent a pdu 1379 return true; 1380 } 1381 1382 switch (gatt_client->mtu_state) { 1383 case SEND_MTU_EXCHANGE: 1384 gatt_client->mtu_state = SENT_MTU_EXCHANGE; 1385 att_exchange_mtu_request(gatt_client); 1386 return true; 1387 case SENT_MTU_EXCHANGE: 1388 return false; 1389 default: 1390 break; 1391 } 1392 1393 if (gatt_client->send_confirmation){ 1394 gatt_client->send_confirmation = false; 1395 att_confirmation(gatt_client); 1396 return true; 1397 } 1398 1399 // check MTU for writes 1400 switch (gatt_client->state){ 1401 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 1402 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 1403 if (gatt_client->attribute_length <= (gatt_client->mtu - 3u)) break; 1404 log_error("gatt_client_run: value len %u > MTU %u - 3\n", gatt_client->attribute_length,gatt_client->mtu); 1405 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH); 1406 return false; 1407 default: 1408 break; 1409 } 1410 1411 bool packet_sent = true; 1412 bool done = true; 1413 switch (gatt_client->state){ 1414 case P_W2_SEND_SERVICE_QUERY: 1415 gatt_client->state = P_W4_SERVICE_QUERY_RESULT; 1416 send_gatt_services_request(gatt_client); 1417 break; 1418 1419 case P_W2_SEND_SERVICE_WITH_UUID_QUERY: 1420 gatt_client->state = P_W4_SERVICE_WITH_UUID_RESULT; 1421 send_gatt_services_by_uuid_request(gatt_client); 1422 break; 1423 1424 case P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY: 1425 gatt_client->state = P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT; 1426 send_gatt_characteristic_request(gatt_client); 1427 break; 1428 1429 case P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY: 1430 gatt_client->state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 1431 send_gatt_characteristic_request(gatt_client); 1432 break; 1433 1434 case P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY: 1435 gatt_client->state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 1436 send_gatt_characteristic_descriptor_request(gatt_client); 1437 break; 1438 1439 case P_W2_SEND_INCLUDED_SERVICE_QUERY: 1440 gatt_client->state = P_W4_INCLUDED_SERVICE_QUERY_RESULT; 1441 send_gatt_included_service_request(gatt_client); 1442 break; 1443 1444 case P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY: 1445 gatt_client->state = P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT; 1446 send_gatt_included_service_uuid_request(gatt_client); 1447 break; 1448 1449 case P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY: 1450 gatt_client->state = P_W4_READ_CHARACTERISTIC_VALUE_RESULT; 1451 send_gatt_read_characteristic_value_request(gatt_client); 1452 break; 1453 1454 case P_W2_SEND_READ_BLOB_QUERY: 1455 gatt_client->state = P_W4_READ_BLOB_RESULT; 1456 send_gatt_read_blob_request(gatt_client); 1457 break; 1458 1459 case P_W2_SEND_READ_BY_TYPE_REQUEST: 1460 gatt_client->state = P_W4_READ_BY_TYPE_RESPONSE; 1461 send_gatt_read_by_type_request(gatt_client); 1462 break; 1463 1464 case P_W2_SEND_READ_MULTIPLE_REQUEST: 1465 gatt_client->state = P_W4_READ_MULTIPLE_RESPONSE; 1466 send_gatt_read_multiple_request(gatt_client); 1467 break; 1468 1469 #ifdef ENABLE_GATT_OVER_EATT 1470 case P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST: 1471 gatt_client->state = P_W4_READ_MULTIPLE_VARIABLE_RESPONSE; 1472 send_gatt_read_multiple_variable_request(gatt_client); 1473 break; 1474 #endif 1475 1476 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 1477 gatt_client->state = P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT; 1478 send_gatt_write_attribute_value_request(gatt_client); 1479 break; 1480 1481 case P_W2_PREPARE_WRITE: 1482 gatt_client->state = P_W4_PREPARE_WRITE_RESULT; 1483 send_gatt_prepare_write_request(gatt_client); 1484 break; 1485 1486 case P_W2_PREPARE_WRITE_SINGLE: 1487 gatt_client->state = P_W4_PREPARE_WRITE_SINGLE_RESULT; 1488 send_gatt_prepare_write_request(gatt_client); 1489 break; 1490 1491 case P_W2_PREPARE_RELIABLE_WRITE: 1492 gatt_client->state = P_W4_PREPARE_RELIABLE_WRITE_RESULT; 1493 send_gatt_prepare_write_request(gatt_client); 1494 break; 1495 1496 case P_W2_EXECUTE_PREPARED_WRITE: 1497 gatt_client->state = P_W4_EXECUTE_PREPARED_WRITE_RESULT; 1498 send_gatt_execute_write_request(gatt_client); 1499 break; 1500 1501 case P_W2_CANCEL_PREPARED_WRITE: 1502 gatt_client->state = P_W4_CANCEL_PREPARED_WRITE_RESULT; 1503 send_gatt_cancel_prepared_write_request(gatt_client); 1504 break; 1505 1506 case P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH: 1507 gatt_client->state = P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT; 1508 send_gatt_cancel_prepared_write_request(gatt_client); 1509 break; 1510 1511 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1512 case P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 1513 // use Find Information 1514 gatt_client->gatt_client_state = P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1515 send_gatt_characteristic_descriptor_request(gatt_client); 1516 #else 1517 case P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 1518 // Use Read By Type 1519 gatt_client->state = P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1520 send_gatt_read_client_characteristic_configuration_request(gatt_client); 1521 #endif 1522 break; 1523 1524 case P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY: 1525 gatt_client->state = P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT; 1526 send_gatt_read_characteristic_descriptor_request(gatt_client); 1527 break; 1528 1529 case P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY: 1530 gatt_client->state = P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT; 1531 send_gatt_read_blob_request(gatt_client); 1532 break; 1533 1534 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 1535 gatt_client->state = P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1536 send_gatt_write_attribute_value_request(gatt_client); 1537 break; 1538 1539 case P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION: 1540 gatt_client->state = P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT; 1541 send_gatt_write_client_characteristic_configuration_request(gatt_client); 1542 break; 1543 1544 case P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR: 1545 gatt_client->state = P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1546 send_gatt_prepare_write_request(gatt_client); 1547 break; 1548 1549 case P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR: 1550 gatt_client->state = P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1551 send_gatt_execute_write_request(gatt_client); 1552 break; 1553 1554 #ifdef ENABLE_LE_SIGNED_WRITE 1555 case P_W4_IDENTITY_RESOLVING: 1556 log_info("P_W4_IDENTITY_RESOLVING - state %x", sm_identity_resolving_state(gatt_client->con_handle)); 1557 switch (sm_identity_resolving_state(gatt_client->con_handle)){ 1558 case IRK_LOOKUP_SUCCEEDED: 1559 gatt_client->le_device_index = sm_le_device_index(gatt_client->con_handle); 1560 gatt_client->state = P_W4_CMAC_READY; 1561 if (sm_cmac_ready()){ 1562 gatt_client_run_for_client_start_signed_write(gatt_client); 1563 } 1564 break; 1565 case IRK_LOOKUP_FAILED: 1566 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1567 break; 1568 default: 1569 break; 1570 } 1571 packet_sent = false; 1572 break; 1573 1574 case P_W4_CMAC_READY: 1575 if (sm_cmac_ready()){ 1576 gatt_client_run_for_client_start_signed_write(gatt_client); 1577 } 1578 packet_sent = false; 1579 break; 1580 1581 case P_W2_SEND_SIGNED_WRITE: { 1582 gatt_client->state = P_W4_SEND_SIGNED_WRITE_DONE; 1583 // bump local signing counter 1584 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 1585 le_device_db_local_counter_set(gatt_client->le_device_index, sign_counter + 1); 1586 // send signed write command 1587 send_gatt_signed_write_request(gatt_client, sign_counter); 1588 // finally, notifiy client that write is complete 1589 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1590 break; 1591 } 1592 #endif 1593 default: 1594 done = false; 1595 break; 1596 } 1597 1598 if (done){ 1599 return packet_sent; 1600 } 1601 1602 // write without response callback 1603 btstack_context_callback_registration_t * callback = 1604 (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->write_without_response_requests); 1605 if (callback != NULL){ 1606 (*callback->callback)(callback->context); 1607 return true; 1608 } 1609 1610 // requested can send now old 1611 if (gatt_client->write_without_response_callback != NULL){ 1612 btstack_packet_handler_t packet_handler = gatt_client->write_without_response_callback; 1613 gatt_client->write_without_response_callback = NULL; 1614 uint8_t event[4]; 1615 event[0] = GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE; 1616 event[1] = sizeof(event) - 2u; 1617 little_endian_store_16(event, 2, gatt_client->con_handle); 1618 packet_handler(HCI_EVENT_PACKET, gatt_client->con_handle, event, sizeof(event)); 1619 return true; // to trigger requeueing (even if higher layer didn't sent) 1620 } 1621 1622 return false; 1623 } 1624 1625 static void gatt_client_run(void){ 1626 btstack_linked_item_t *it; 1627 bool packet_sent; 1628 #ifdef ENABLE_GATT_OVER_EATT 1629 btstack_linked_list_iterator_t it_eatt; 1630 #endif 1631 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 1632 gatt_client_t * gatt_client = (gatt_client_t *) it; 1633 switch (gatt_client->bearer_type){ 1634 case ATT_BEARER_UNENHANCED_LE: 1635 #ifdef ENABLE_GATT_OVER_EATT 1636 btstack_linked_list_iterator_init(&it_eatt, &gatt_client->eatt_clients); 1637 while (btstack_linked_list_iterator_has_next(&it_eatt)) { 1638 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it_eatt); 1639 if (eatt_client->state != P_READY){ 1640 if (att_dispatch_client_can_send_now(gatt_client->con_handle)){ 1641 gatt_client_run_for_gatt_client(eatt_client); 1642 } 1643 } 1644 } 1645 #endif 1646 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) { 1647 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1648 return; 1649 } 1650 packet_sent = gatt_client_run_for_gatt_client(gatt_client); 1651 if (packet_sent){ 1652 // request new permission 1653 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1654 // requeue client for fairness and exit 1655 // note: iterator has become invalid 1656 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1657 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1658 return; 1659 } 1660 break; 1661 #ifdef ENABLE_GATT_OVER_CLASSIC 1662 case ATT_BEARER_UNENHANCED_CLASSIC: 1663 if (gatt_client->con_handle == HCI_CON_HANDLE_INVALID) { 1664 continue; 1665 } 1666 1667 // handle GATT over BR/EDR 1668 if (att_dispatch_client_can_send_now(gatt_client->con_handle) == false) { 1669 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1670 return; 1671 } 1672 packet_sent = gatt_client_run_for_gatt_client(gatt_client); 1673 if (packet_sent){ 1674 // request new permission 1675 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1676 // requeue client for fairness and exit 1677 // note: iterator has become invalid 1678 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1679 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1680 return; 1681 } 1682 break; 1683 #endif 1684 default: 1685 btstack_unreachable(); 1686 break; 1687 } 1688 1689 1690 } 1691 } 1692 1693 // emit complete event, used to avoid emitting event from API call 1694 static void gatt_client_emit_events(void * context){ 1695 UNUSED(context); 1696 btstack_linked_item_t *it; 1697 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next) { 1698 gatt_client_t *gatt_client = (gatt_client_t *) it; 1699 if (gatt_client->state == P_W2_EMIT_QUERY_COMPLETE_EVENT){ 1700 gatt_client->state = P_READY; 1701 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1702 } 1703 } 1704 } 1705 1706 static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code) { 1707 if (is_ready(gatt_client)) return; 1708 gatt_client_handle_transaction_complete(gatt_client, att_error_code); 1709 } 1710 1711 static void gatt_client_handle_reencryption_complete(const uint8_t * packet){ 1712 hci_con_handle_t con_handle = sm_event_reencryption_complete_get_handle(packet); 1713 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 1714 if (gatt_client == NULL) return; 1715 1716 // update security level 1717 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 1718 1719 gatt_client->reencryption_result = sm_event_reencryption_complete_get_status(packet); 1720 gatt_client->reencryption_active = false; 1721 gatt_client->wait_for_authentication_complete = false; 1722 1723 if (gatt_client->state == P_READY) return; 1724 1725 switch (sm_event_reencryption_complete_get_status(packet)){ 1726 case ERROR_CODE_SUCCESS: 1727 log_info("re-encryption success, retry operation"); 1728 break; 1729 case ERROR_CODE_AUTHENTICATION_FAILURE: 1730 case ERROR_CODE_PIN_OR_KEY_MISSING: 1731 #if defined(ENABLE_GATT_CLIENT_PAIRING) && !defined(ENABLE_LE_PROACTIVE_AUTHENTICATION) 1732 if (gatt_client_required_security_level == LEVEL_0) { 1733 // re-encryption failed for reactive authentication with pairing and we have a pending client request 1734 // => try to resolve it by deleting bonding information if we started pairing before 1735 // delete bonding information 1736 int le_device_db_index = sm_le_device_index(gatt_client->con_handle); 1737 btstack_assert(le_device_db_index >= 0); 1738 log_info("reactive auth with pairing: delete bonding and start pairing"); 1739 #ifdef ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION 1740 hci_remove_le_device_db_entry_from_resolving_list((uint16_t) le_device_db_index); 1741 #endif 1742 le_device_db_remove(le_device_db_index); 1743 // trigger pairing again 1744 sm_request_pairing(gatt_client->con_handle); 1745 break; 1746 } 1747 #endif 1748 // report bonding information missing 1749 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1750 break; 1751 default: 1752 // report bonding information missing 1753 gatt_client_handle_transaction_complete(gatt_client, gatt_client->pending_error_code); 1754 break; 1755 } 1756 } 1757 1758 static void gatt_client_handle_disconnection_complete(const uint8_t * packet){ 1759 log_info("GATT Client: HCI_EVENT_DISCONNECTION_COMPLETE"); 1760 hci_con_handle_t con_handle = little_endian_read_16(packet,3); 1761 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 1762 if (gatt_client == NULL) return; 1763 1764 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 1765 gatt_client_timeout_stop(gatt_client); 1766 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1767 btstack_memory_gatt_client_free(gatt_client); 1768 } 1769 1770 static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1771 UNUSED(channel); // ok: handling own l2cap events 1772 UNUSED(size); // ok: there is no channel 1773 1774 if (packet_type != HCI_EVENT_PACKET) return; 1775 1776 hci_con_handle_t con_handle; 1777 gatt_client_t * gatt_client; 1778 switch (hci_event_packet_get_type(packet)) { 1779 case HCI_EVENT_DISCONNECTION_COMPLETE: 1780 gatt_client_handle_disconnection_complete(packet); 1781 break; 1782 1783 // Pairing complete (with/without bonding=storing of pairing information) 1784 case SM_EVENT_PAIRING_COMPLETE: 1785 con_handle = sm_event_pairing_complete_get_handle(packet); 1786 gatt_client = gatt_client_get_context_for_handle(con_handle); 1787 if (gatt_client == NULL) break; 1788 1789 // update security level 1790 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 1791 1792 if (gatt_client->wait_for_authentication_complete){ 1793 gatt_client->wait_for_authentication_complete = false; 1794 if (sm_event_pairing_complete_get_status(packet) != ERROR_CODE_SUCCESS){ 1795 log_info("pairing failed, report previous error 0x%x", gatt_client->pending_error_code); 1796 gatt_client_report_error_if_pending(gatt_client, gatt_client->pending_error_code); 1797 } else { 1798 log_info("pairing success, retry operation"); 1799 } 1800 } 1801 break; 1802 1803 #ifdef ENABLE_LE_SIGNED_WRITE 1804 // Identity Resolving completed (no code, gatt_client_run will continue) 1805 case SM_EVENT_IDENTITY_RESOLVING_SUCCEEDED: 1806 case SM_EVENT_IDENTITY_RESOLVING_FAILED: 1807 break; 1808 #endif 1809 1810 // re-encryption started 1811 case SM_EVENT_REENCRYPTION_STARTED: 1812 con_handle = sm_event_reencryption_complete_get_handle(packet); 1813 gatt_client = gatt_client_get_context_for_handle(con_handle); 1814 if (gatt_client == NULL) break; 1815 1816 gatt_client->reencryption_active = true; 1817 gatt_client->reencryption_result = ERROR_CODE_SUCCESS; 1818 break; 1819 1820 // re-encryption complete 1821 case SM_EVENT_REENCRYPTION_COMPLETE: 1822 gatt_client_handle_reencryption_complete(packet); 1823 break; 1824 default: 1825 break; 1826 } 1827 1828 gatt_client_run(); 1829 } 1830 1831 static void gatt_client_handle_att_read_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { 1832 switch (gatt_client->state) { 1833 case P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT: 1834 if (size >= 17) { 1835 uint8_t uuid128[16]; 1836 reverse_128(&packet[1], uuid128); 1837 report_gatt_included_service_uuid128(gatt_client, gatt_client->start_group_handle, uuid128); 1838 } 1839 trigger_next_included_service_query(gatt_client, gatt_client->start_group_handle); 1840 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1841 break; 1842 1843 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 1844 report_gatt_characteristic_value(gatt_client, gatt_client->attribute_handle, &packet[1], size - 1u); 1845 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1846 break; 1847 1848 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: 1849 report_gatt_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], 1850 size - 1u, 0u); 1851 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1852 break; 1853 1854 // Use ATT_READ_REQUEST for first blob of Read Long Characteristic 1855 case P_W4_READ_BLOB_RESULT: 1856 report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], 1857 size - 1u, gatt_client->attribute_offset); 1858 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, size - 1u); 1859 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1860 break; 1861 1862 // Use ATT_READ_REQUEST for first blob of Read Long Characteristic Descriptor 1863 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 1864 report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], 1865 size - 1u, gatt_client->attribute_offset); 1866 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, 1867 size - 1u); 1868 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1869 break; 1870 1871 default: 1872 break; 1873 } 1874 } 1875 1876 static void gatt_client_handle_att_read_by_type_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { 1877 switch (gatt_client->state) { 1878 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 1879 report_gatt_characteristics(gatt_client, packet, size); 1880 trigger_next_characteristic_query(gatt_client, 1881 get_last_result_handle_from_characteristics_list(packet, size)); 1882 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1883 break; 1884 case P_W4_CHARACTERISTIC_WITH_UUID_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_INCLUDED_SERVICE_QUERY_RESULT: { 1891 if (size < 2u) break; 1892 uint16_t uuid16 = 0; 1893 uint16_t pair_size = packet[1]; 1894 1895 if (pair_size == 6u) { 1896 if (size < 8u) break; 1897 // UUIDs not available, query first included service 1898 gatt_client->start_group_handle = little_endian_read_16(packet, 2); // ready for next query 1899 gatt_client->query_start_handle = little_endian_read_16(packet, 4); 1900 gatt_client->query_end_handle = little_endian_read_16(packet, 6); 1901 gatt_client->state = P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY; 1902 break; 1903 } 1904 1905 if (pair_size != 8u) break; 1906 1907 // UUIDs included, report all of them 1908 uint16_t offset; 1909 for (offset = 2u; (offset + 8u) <= size; offset += pair_size) { 1910 uint16_t include_handle = little_endian_read_16(packet, offset); 1911 gatt_client->query_start_handle = little_endian_read_16(packet, offset + 2u); 1912 gatt_client->query_end_handle = little_endian_read_16(packet, offset + 4u); 1913 uuid16 = little_endian_read_16(packet, offset + 6u); 1914 report_gatt_included_service_uuid16(gatt_client, include_handle, uuid16); 1915 } 1916 1917 trigger_next_included_service_query(gatt_client, 1918 get_last_result_handle_from_included_services_list(packet, 1919 size)); 1920 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1921 break; 1922 } 1923 #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1924 case P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT: 1925 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, 2); 1926 gatt_client->state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 1927 break; 1928 #endif 1929 case P_W4_READ_BY_TYPE_RESPONSE: { 1930 uint16_t pair_size = packet[1]; 1931 // set last result handle to last valid handle, only used if pair_size invalid 1932 uint16_t last_result_handle = 0xffff; 1933 if (pair_size > 2) { 1934 uint16_t offset; 1935 for (offset = 2; offset < size; offset += pair_size) { 1936 uint16_t value_handle = little_endian_read_16(packet, offset); 1937 report_gatt_characteristic_value(gatt_client, value_handle, &packet[offset + 2u], 1938 pair_size - 2u); 1939 last_result_handle = value_handle; 1940 } 1941 } 1942 trigger_next_read_by_type_query(gatt_client, last_result_handle); 1943 break; 1944 } 1945 default: 1946 break; 1947 } 1948 } 1949 1950 static void gatt_client_handle_att_write_response(gatt_client_t *gatt_client) { 1951 switch (gatt_client->state) { 1952 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 1953 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1954 break; 1955 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 1956 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1957 break; 1958 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1959 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1960 break; 1961 default: 1962 break; 1963 } 1964 } 1965 1966 static void gatt_client_handle_att_response(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size) { 1967 uint8_t att_status; 1968 switch (packet[0]) { 1969 case ATT_EXCHANGE_MTU_RESPONSE: { 1970 if (size < 3u) break; 1971 bool update_gatt_server_att_mtu = false; 1972 uint16_t remote_rx_mtu = little_endian_read_16(packet, 1); 1973 uint16_t local_rx_mtu = l2cap_max_le_mtu(); 1974 switch (gatt_client->bearer_type){ 1975 case ATT_BEARER_UNENHANCED_LE: 1976 update_gatt_server_att_mtu = true; 1977 break; 1978 #ifdef ENABLE_GATT_OVER_CLASSIC 1979 case ATT_BEARER_UNENHANCED_CLASSIC: 1980 local_rx_mtu = gatt_client->mtu; 1981 break; 1982 #endif 1983 default: 1984 btstack_unreachable(); 1985 break; 1986 } 1987 1988 uint16_t mtu = (remote_rx_mtu < local_rx_mtu) ? remote_rx_mtu : local_rx_mtu; 1989 1990 // set gatt client mtu 1991 gatt_client->mtu = mtu; 1992 gatt_client->mtu_state = MTU_EXCHANGED; 1993 1994 if (update_gatt_server_att_mtu){ 1995 // set per connection mtu state - for fixed channel 1996 hci_connection_t *hci_connection = hci_connection_for_handle(gatt_client->con_handle); 1997 hci_connection->att_connection.mtu = gatt_client->mtu; 1998 hci_connection->att_connection.mtu_exchanged = true; 1999 } 2000 emit_gatt_mtu_exchanged_result_event(gatt_client, gatt_client->mtu); 2001 break; 2002 } 2003 case ATT_READ_BY_GROUP_TYPE_RESPONSE: 2004 switch (gatt_client->state) { 2005 case P_W4_SERVICE_QUERY_RESULT: 2006 report_gatt_services(gatt_client, packet, size); 2007 trigger_next_service_query(gatt_client, get_last_result_handle_from_service_list(packet, size)); 2008 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2009 break; 2010 default: 2011 break; 2012 } 2013 break; 2014 case ATT_HANDLE_VALUE_NOTIFICATION: 2015 if (size < 3u) return; 2016 report_gatt_notification(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); 2017 return; 2018 #ifdef ENABLE_GATT_OVER_EATT 2019 case ATT_MULTIPLE_HANDLE_VALUE_NTF: 2020 if (size >= 5u) { 2021 uint16_t offset = 1; 2022 while (true){ 2023 uint16_t value_handle = little_endian_read_16(packet, offset); 2024 offset += 2; 2025 uint16_t value_length = little_endian_read_16(packet, offset); 2026 offset += 2; 2027 if ((offset + value_length) > size) break; 2028 report_gatt_notification(gatt_client, value_handle, &packet[offset], value_length); 2029 offset += value_length; 2030 } 2031 } 2032 return; 2033 #endif 2034 case ATT_HANDLE_VALUE_INDICATION: 2035 if (size < 3u) break; 2036 report_gatt_indication(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); 2037 gatt_client->send_confirmation = true; 2038 break; 2039 case ATT_READ_BY_TYPE_RESPONSE: 2040 gatt_client_handle_att_read_by_type_response(gatt_client, packet, size); 2041 break; 2042 case ATT_READ_RESPONSE: 2043 gatt_client_handle_att_read_response(gatt_client, packet, size); 2044 break; 2045 case ATT_FIND_BY_TYPE_VALUE_RESPONSE: { 2046 uint8_t pair_size = 4; 2047 int i; 2048 uint16_t start_group_handle; 2049 uint16_t end_group_handle = 0xffff; // asserts GATT_EVENT_QUERY_COMPLETE is emitted if no results 2050 for (i = 1u; (i + pair_size) <= size; i += pair_size) { 2051 start_group_handle = little_endian_read_16(packet, i); 2052 end_group_handle = little_endian_read_16(packet, i + 2); 2053 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, 2054 gatt_client->uuid128); 2055 } 2056 trigger_next_service_by_uuid_query(gatt_client, end_group_handle); 2057 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2058 break; 2059 } 2060 case ATT_FIND_INFORMATION_REPLY: { 2061 if (size < 2u) break; 2062 2063 uint8_t pair_size = 4; 2064 if (packet[1u] == 2u) { 2065 pair_size = 18; 2066 } 2067 uint16_t offset = 2; 2068 2069 if (size < (pair_size + offset)) break; 2070 uint16_t last_descriptor_handle = little_endian_read_16(packet, size - pair_size); 2071 2072 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 2073 log_info("ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY, state %x", gatt_client->gatt_client_state); 2074 if (gatt_client->gatt_client_state == P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT){ 2075 // iterate over descriptors looking for CCC 2076 if (pair_size == 4){ 2077 while ((offset + 4) <= size){ 2078 uint16_t uuid16 = little_endian_read_16(packet, offset + 2); 2079 if (uuid16 == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION){ 2080 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, offset); 2081 gatt_client->gatt_client_state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 2082 log_info("CCC found %x", gatt_client->client_characteristic_configuration_handle); 2083 break; 2084 } 2085 offset += pair_size; 2086 } 2087 } 2088 if (is_query_done(gatt_client, last_descriptor_handle)){ 2089 2090 } else { 2091 // next 2092 gatt_client->start_group_handle = last_descriptor_handle + 1; 2093 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2094 } 2095 break; 2096 } 2097 #endif 2098 report_gatt_all_characteristic_descriptors(gatt_client, &packet[2], size - 2u, pair_size); 2099 trigger_next_characteristic_descriptor_query(gatt_client, last_descriptor_handle); 2100 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2101 break; 2102 } 2103 2104 case ATT_WRITE_RESPONSE: 2105 gatt_client_handle_att_write_response(gatt_client); 2106 break; 2107 2108 case ATT_READ_BLOB_RESPONSE: { 2109 uint16_t received_blob_length = size - 1u; 2110 switch (gatt_client->state) { 2111 case P_W4_READ_BLOB_RESULT: 2112 report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], 2113 received_blob_length, gatt_client->attribute_offset); 2114 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, received_blob_length); 2115 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2116 break; 2117 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 2118 report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, 2119 &packet[1], received_blob_length, 2120 gatt_client->attribute_offset); 2121 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, 2122 received_blob_length); 2123 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2124 break; 2125 default: 2126 break; 2127 } 2128 break; 2129 } 2130 case ATT_PREPARE_WRITE_RESPONSE: 2131 switch (gatt_client->state) { 2132 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 2133 if (is_value_valid(gatt_client, packet, size)) { 2134 att_status = ATT_ERROR_SUCCESS; 2135 } else { 2136 att_status = ATT_ERROR_DATA_MISMATCH; 2137 } 2138 gatt_client_handle_transaction_complete(gatt_client, att_status); 2139 break; 2140 2141 case P_W4_PREPARE_WRITE_RESULT: { 2142 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 2143 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE, P_W2_EXECUTE_PREPARED_WRITE); 2144 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2145 break; 2146 } 2147 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: { 2148 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 2149 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR, 2150 P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR); 2151 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2152 break; 2153 } 2154 case P_W4_PREPARE_RELIABLE_WRITE_RESULT: { 2155 if (is_value_valid(gatt_client, packet, size)) { 2156 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 2157 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_RELIABLE_WRITE, 2158 P_W2_EXECUTE_PREPARED_WRITE); 2159 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2160 break; 2161 } 2162 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 2163 break; 2164 } 2165 default: 2166 break; 2167 } 2168 break; 2169 2170 case ATT_EXECUTE_WRITE_RESPONSE: 2171 switch (gatt_client->state) { 2172 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 2173 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2174 break; 2175 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 2176 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2177 break; 2178 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 2179 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_DATA_MISMATCH); 2180 break; 2181 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2182 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2183 break; 2184 default: 2185 break; 2186 2187 } 2188 break; 2189 2190 case ATT_READ_MULTIPLE_RESPONSE: 2191 switch (gatt_client->state) { 2192 case P_W4_READ_MULTIPLE_RESPONSE: 2193 report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); 2194 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2195 break; 2196 default: 2197 break; 2198 } 2199 break; 2200 2201 #ifdef ENABLE_GATT_OVER_EATT 2202 case ATT_READ_MULTIPLE_VARIABLE_RSP: 2203 switch (gatt_client->state) { 2204 case P_W4_READ_MULTIPLE_VARIABLE_RESPONSE: 2205 report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); 2206 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2207 break; 2208 default: 2209 break; 2210 } 2211 break; 2212 #endif 2213 2214 case ATT_ERROR_RESPONSE: 2215 if (size < 5u) return; 2216 att_status = packet[4]; 2217 switch (att_status) { 2218 case ATT_ERROR_ATTRIBUTE_NOT_FOUND: { 2219 switch (gatt_client->state) { 2220 case P_W4_SERVICE_QUERY_RESULT: 2221 case P_W4_SERVICE_WITH_UUID_RESULT: 2222 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: 2223 case P_W4_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT: 2224 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2225 break; 2226 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 2227 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 2228 report_gatt_characteristic_end_found(gatt_client, gatt_client->end_group_handle); 2229 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2230 break; 2231 case P_W4_READ_BY_TYPE_RESPONSE: 2232 if (gatt_client->start_group_handle == gatt_client->query_start_handle) { 2233 att_status = ATT_ERROR_ATTRIBUTE_NOT_FOUND; 2234 } else { 2235 att_status = ATT_ERROR_SUCCESS; 2236 } 2237 gatt_client_handle_transaction_complete(gatt_client, att_status); 2238 break; 2239 default: 2240 gatt_client_report_error_if_pending(gatt_client, att_status); 2241 break; 2242 } 2243 break; 2244 } 2245 2246 #ifdef ENABLE_GATT_CLIENT_PAIRING 2247 2248 case ATT_ERROR_INSUFFICIENT_AUTHENTICATION: 2249 case ATT_ERROR_INSUFFICIENT_ENCRYPTION_KEY_SIZE: 2250 case ATT_ERROR_INSUFFICIENT_ENCRYPTION: { 2251 2252 // security too low 2253 if (gatt_client->security_counter > 0) { 2254 gatt_client_report_error_if_pending(gatt_client, att_status); 2255 break; 2256 } 2257 // start security 2258 gatt_client->security_counter++; 2259 2260 // setup action 2261 int retry = 1; 2262 switch (gatt_client->state){ 2263 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 2264 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY ; 2265 break; 2266 case P_W4_READ_BLOB_RESULT: 2267 gatt_client->state = P_W2_SEND_READ_BLOB_QUERY; 2268 break; 2269 case P_W4_READ_BY_TYPE_RESPONSE: 2270 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2271 break; 2272 case P_W4_READ_MULTIPLE_RESPONSE: 2273 gatt_client->state = P_W2_SEND_READ_MULTIPLE_REQUEST; 2274 break; 2275 case P_W4_READ_MULTIPLE_VARIABLE_RESPONSE: 2276 gatt_client->state = P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST; 2277 break; 2278 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 2279 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 2280 break; 2281 case P_W4_PREPARE_WRITE_RESULT: 2282 gatt_client->state = P_W2_PREPARE_WRITE; 2283 break; 2284 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 2285 gatt_client->state = P_W2_PREPARE_WRITE_SINGLE; 2286 break; 2287 case P_W4_PREPARE_RELIABLE_WRITE_RESULT: 2288 gatt_client->state = P_W2_PREPARE_RELIABLE_WRITE; 2289 break; 2290 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 2291 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE; 2292 break; 2293 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 2294 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE; 2295 break; 2296 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 2297 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 2298 break; 2299 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: 2300 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 2301 break; 2302 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 2303 gatt_client->state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 2304 break; 2305 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2306 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 2307 break; 2308 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 2309 gatt_client->state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 2310 break; 2311 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2312 gatt_client->state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 2313 break; 2314 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2315 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR; 2316 break; 2317 #ifdef ENABLE_LE_SIGNED_WRITE 2318 case P_W4_SEND_SIGNED_WRITE_DONE: 2319 gatt_client->state = P_W2_SEND_SIGNED_WRITE; 2320 break; 2321 #endif 2322 default: 2323 log_info("retry not supported for state %x", gatt_client->state); 2324 retry = 0; 2325 break; 2326 } 2327 2328 if (!retry) { 2329 gatt_client_report_error_if_pending(gatt_client, att_status); 2330 break; 2331 } 2332 2333 log_info("security error, start pairing"); 2334 2335 // start pairing for higher security level 2336 gatt_client->wait_for_authentication_complete = true; 2337 gatt_client->pending_error_code = att_status; 2338 sm_request_pairing(gatt_client->con_handle); 2339 break; 2340 } 2341 #endif 2342 2343 // nothing we can do about that 2344 case ATT_ERROR_INSUFFICIENT_AUTHORIZATION: 2345 default: 2346 gatt_client_report_error_if_pending(gatt_client, att_status); 2347 break; 2348 } 2349 break; 2350 2351 default: 2352 log_info("ATT Handler, unhandled response type 0x%02x", packet[0]); 2353 break; 2354 } 2355 } 2356 2357 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size) { 2358 gatt_client_t *gatt_client; 2359 #ifdef ENABLE_GATT_OVER_CLASSIC 2360 uint8_t status; 2361 hci_connection_t * hci_connection; 2362 hci_con_handle_t con_handle; 2363 #endif 2364 2365 if (size < 1u) return; 2366 switch (packet_type){ 2367 case HCI_EVENT_PACKET: 2368 switch (hci_event_packet_get_type(packet)) { 2369 #ifdef ENABLE_GATT_OVER_CLASSIC 2370 case L2CAP_EVENT_CHANNEL_OPENED: 2371 status = l2cap_event_channel_opened_get_status(packet); 2372 gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_opened_get_local_cid(packet)); 2373 if (gatt_client != NULL){ 2374 con_handle = l2cap_event_channel_opened_get_handle(packet); 2375 hci_connection = hci_connection_for_handle(con_handle); 2376 if (status == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_RESOURCES){ 2377 if ((hci_connection != NULL) && hci_connection->att_server.incoming_connection_request) { 2378 log_info("Collision, retry in 100ms"); 2379 gatt_client->state = P_W2_L2CAP_CONNECT; 2380 // set timer for retry 2381 btstack_run_loop_set_timer(&gatt_client->gc_timeout, GATT_CLIENT_COLLISION_BACKOFF_MS); 2382 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_classic_retry); 2383 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 2384 break; 2385 } 2386 } 2387 // if status != 0, gatt_client will be discarded 2388 gatt_client->state = P_READY; 2389 gatt_client->con_handle = l2cap_event_channel_opened_get_handle(packet); 2390 gatt_client->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); 2391 gatt_client_classic_handle_connected(gatt_client, status); 2392 } 2393 break; 2394 case L2CAP_EVENT_CHANNEL_CLOSED: 2395 gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_closed_get_local_cid(packet)); 2396 if (gatt_client != NULL){ 2397 // discard gatt client object 2398 gatt_client_classic_handle_disconnected(gatt_client); 2399 } 2400 break; 2401 #endif 2402 case L2CAP_EVENT_CAN_SEND_NOW: 2403 gatt_client_run(); 2404 break; 2405 // att_server has negotiated the mtu for this connection, cache if context exists 2406 case ATT_EVENT_MTU_EXCHANGE_COMPLETE: 2407 if (size < 6u) break; 2408 gatt_client = gatt_client_get_context_for_handle(handle); 2409 if (gatt_client != NULL) { 2410 gatt_client->mtu = little_endian_read_16(packet, 4); 2411 } 2412 break; 2413 default: 2414 break; 2415 } 2416 break; 2417 2418 case ATT_DATA_PACKET: 2419 // special cases: notifications & indications motivate creating context 2420 switch (packet[0]) { 2421 case ATT_HANDLE_VALUE_NOTIFICATION: 2422 case ATT_HANDLE_VALUE_INDICATION: 2423 gatt_client_provide_context_for_handle(handle, &gatt_client); 2424 break; 2425 default: 2426 gatt_client = gatt_client_get_context_for_handle(handle); 2427 break; 2428 } 2429 2430 if (gatt_client != NULL) { 2431 gatt_client_handle_att_response(gatt_client, packet, size); 2432 gatt_client_run(); 2433 } 2434 break; 2435 2436 #ifdef ENABLE_GATT_OVER_CLASSIC 2437 case L2CAP_DATA_PACKET: 2438 gatt_client = gatt_client_get_context_for_l2cap_cid(handle); 2439 if (gatt_client != NULL){ 2440 gatt_client_handle_att_response(gatt_client, packet, size); 2441 gatt_client_run(); 2442 } 2443 break; 2444 #endif 2445 2446 default: 2447 break; 2448 } 2449 } 2450 2451 #ifdef ENABLE_LE_SIGNED_WRITE 2452 static void att_signed_write_handle_cmac_result(uint8_t hash[8]){ 2453 btstack_linked_list_iterator_t it; 2454 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 2455 while (btstack_linked_list_iterator_has_next(&it)){ 2456 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 2457 if (gatt_client->state == P_W4_CMAC_RESULT){ 2458 // store result 2459 (void)memcpy(gatt_client->cmac, hash, 8); 2460 // reverse_64(hash, gatt_client->cmac); 2461 gatt_client->state = P_W2_SEND_SIGNED_WRITE; 2462 gatt_client_run(); 2463 return; 2464 } 2465 } 2466 } 2467 2468 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){ 2469 gatt_client_t * gatt_client; 2470 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2471 if (status != ERROR_CODE_SUCCESS){ 2472 return status; 2473 } 2474 if (is_ready(gatt_client) == 0){ 2475 return GATT_CLIENT_IN_WRONG_STATE; 2476 } 2477 2478 gatt_client->callback = callback; 2479 gatt_client->attribute_handle = value_handle; 2480 gatt_client->attribute_length = message_len; 2481 gatt_client->attribute_value = message; 2482 gatt_client->state = P_W4_IDENTITY_RESOLVING; 2483 gatt_client_run(); 2484 return ERROR_CODE_SUCCESS; 2485 } 2486 #endif 2487 2488 uint8_t gatt_client_discover_primary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2489 gatt_client_t * gatt_client; 2490 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2491 if (status != ERROR_CODE_SUCCESS){ 2492 return status; 2493 } 2494 2495 gatt_client->callback = callback; 2496 gatt_client->start_group_handle = 0x0001; 2497 gatt_client->end_group_handle = 0xffff; 2498 gatt_client->state = P_W2_SEND_SERVICE_QUERY; 2499 gatt_client->uuid16 = GATT_PRIMARY_SERVICE_UUID; 2500 gatt_client_run(); 2501 return ERROR_CODE_SUCCESS; 2502 } 2503 2504 uint8_t gatt_client_discover_secondary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2505 gatt_client_t * gatt_client; 2506 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2507 if (status != ERROR_CODE_SUCCESS){ 2508 return status; 2509 } 2510 2511 gatt_client->callback = callback; 2512 gatt_client->start_group_handle = 0x0001; 2513 gatt_client->end_group_handle = 0xffff; 2514 gatt_client->state = P_W2_SEND_SERVICE_QUERY; 2515 gatt_client->uuid16 = GATT_SECONDARY_SERVICE_UUID; 2516 gatt_client_run(); 2517 return ERROR_CODE_SUCCESS; 2518 } 2519 2520 uint8_t gatt_client_discover_primary_services_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t uuid16){ 2521 gatt_client_t * gatt_client; 2522 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2523 if (status != ERROR_CODE_SUCCESS){ 2524 return status; 2525 } 2526 2527 gatt_client->callback = callback; 2528 gatt_client->start_group_handle = 0x0001; 2529 gatt_client->end_group_handle = 0xffff; 2530 gatt_client->state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 2531 gatt_client->uuid16 = uuid16; 2532 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), gatt_client->uuid16); 2533 gatt_client_run(); 2534 return ERROR_CODE_SUCCESS; 2535 } 2536 2537 uint8_t gatt_client_discover_primary_services_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, const uint8_t * uuid128){ 2538 gatt_client_t * gatt_client; 2539 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2540 if (status != ERROR_CODE_SUCCESS){ 2541 return status; 2542 } 2543 2544 gatt_client->callback = callback; 2545 gatt_client->start_group_handle = 0x0001; 2546 gatt_client->end_group_handle = 0xffff; 2547 gatt_client->uuid16 = 0; 2548 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2549 gatt_client->state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 2550 gatt_client_run(); 2551 return ERROR_CODE_SUCCESS; 2552 } 2553 2554 uint8_t gatt_client_discover_characteristics_for_service(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service){ 2555 gatt_client_t * gatt_client; 2556 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2557 if (status != ERROR_CODE_SUCCESS){ 2558 return status; 2559 } 2560 2561 gatt_client->callback = callback; 2562 gatt_client->start_group_handle = service->start_group_handle; 2563 gatt_client->end_group_handle = service->end_group_handle; 2564 gatt_client->filter_with_uuid = false; 2565 gatt_client->characteristic_start_handle = 0; 2566 gatt_client->state = P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY; 2567 gatt_client_run(); 2568 return ERROR_CODE_SUCCESS; 2569 } 2570 2571 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){ 2572 gatt_client_t * gatt_client; 2573 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2574 if (status != ERROR_CODE_SUCCESS){ 2575 return status; 2576 } 2577 2578 gatt_client->callback = callback; 2579 gatt_client->start_group_handle = service->start_group_handle; 2580 gatt_client->end_group_handle = service->end_group_handle; 2581 gatt_client->state = P_W2_SEND_INCLUDED_SERVICE_QUERY; 2582 2583 gatt_client_run(); 2584 return ERROR_CODE_SUCCESS; 2585 } 2586 2587 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){ 2588 gatt_client_t * gatt_client; 2589 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2590 if (status != ERROR_CODE_SUCCESS){ 2591 return status; 2592 } 2593 2594 gatt_client->callback = callback; 2595 gatt_client->start_group_handle = start_handle; 2596 gatt_client->end_group_handle = end_handle; 2597 gatt_client->filter_with_uuid = true; 2598 gatt_client->uuid16 = uuid16; 2599 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 2600 gatt_client->characteristic_start_handle = 0; 2601 gatt_client->state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 2602 gatt_client_run(); 2603 return ERROR_CODE_SUCCESS; 2604 } 2605 2606 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){ 2607 gatt_client_t * gatt_client; 2608 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2609 if (status != ERROR_CODE_SUCCESS){ 2610 return status; 2611 } 2612 2613 gatt_client->callback = callback; 2614 gatt_client->start_group_handle = start_handle; 2615 gatt_client->end_group_handle = end_handle; 2616 gatt_client->filter_with_uuid = true; 2617 gatt_client->uuid16 = 0; 2618 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2619 gatt_client->characteristic_start_handle = 0; 2620 gatt_client->state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 2621 gatt_client_run(); 2622 return ERROR_CODE_SUCCESS; 2623 } 2624 2625 2626 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){ 2627 return gatt_client_discover_characteristics_for_handle_range_by_uuid16(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid16); 2628 } 2629 2630 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){ 2631 return gatt_client_discover_characteristics_for_handle_range_by_uuid128(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid128); 2632 } 2633 2634 uint8_t gatt_client_discover_characteristic_descriptors(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 2635 gatt_client_t * gatt_client; 2636 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2637 if (status != ERROR_CODE_SUCCESS){ 2638 return status; 2639 } 2640 2641 // check if there is space for characteristics descriptors 2642 if (characteristic->end_handle > characteristic->value_handle){ 2643 gatt_client->callback = callback; 2644 gatt_client->start_group_handle = characteristic->value_handle + 1u; 2645 gatt_client->end_group_handle = characteristic->end_handle; 2646 gatt_client->state = P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY; 2647 gatt_client_run(); 2648 } else { 2649 // schedule gatt complete event on next run loop iteration otherwise 2650 gatt_client->state = P_W2_EMIT_QUERY_COMPLETE_EVENT; 2651 gatt_client_deferred_event_emit.callback = gatt_client_emit_events; 2652 btstack_run_loop_execute_on_main_thread(&gatt_client_deferred_event_emit); 2653 } 2654 return ERROR_CODE_SUCCESS; 2655 } 2656 2657 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){ 2658 gatt_client_t * gatt_client; 2659 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2660 if (status != ERROR_CODE_SUCCESS){ 2661 return status; 2662 } 2663 2664 gatt_client->callback = callback; 2665 gatt_client->attribute_handle = value_handle; 2666 gatt_client->attribute_offset = 0; 2667 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY; 2668 gatt_client_run(); 2669 return ERROR_CODE_SUCCESS; 2670 } 2671 2672 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){ 2673 gatt_client_t * gatt_client; 2674 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2675 if (status != ERROR_CODE_SUCCESS){ 2676 return status; 2677 } 2678 2679 gatt_client->callback = callback; 2680 gatt_client->start_group_handle = start_handle; 2681 gatt_client->end_group_handle = end_handle; 2682 gatt_client->query_start_handle = start_handle; 2683 gatt_client->query_end_handle = end_handle; 2684 gatt_client->uuid16 = uuid16; 2685 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 2686 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2687 gatt_client_run(); 2688 return ERROR_CODE_SUCCESS; 2689 } 2690 2691 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){ 2692 gatt_client_t * gatt_client; 2693 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2694 if (status != ERROR_CODE_SUCCESS){ 2695 return status; 2696 } 2697 2698 gatt_client->callback = callback; 2699 gatt_client->start_group_handle = start_handle; 2700 gatt_client->end_group_handle = end_handle; 2701 gatt_client->query_start_handle = start_handle; 2702 gatt_client->query_end_handle = end_handle; 2703 gatt_client->uuid16 = 0; 2704 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2705 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2706 gatt_client_run(); 2707 return ERROR_CODE_SUCCESS; 2708 } 2709 2710 2711 uint8_t gatt_client_read_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 2712 return gatt_client_read_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); 2713 } 2714 2715 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){ 2716 gatt_client_t * gatt_client; 2717 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2718 if (status != ERROR_CODE_SUCCESS){ 2719 return status; 2720 } 2721 2722 gatt_client->callback = callback; 2723 gatt_client->attribute_handle = value_handle; 2724 gatt_client->attribute_offset = offset; 2725 gatt_client->state = P_W2_SEND_READ_BLOB_QUERY; 2726 gatt_client_run(); 2727 return ERROR_CODE_SUCCESS; 2728 } 2729 2730 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){ 2731 return gatt_client_read_long_value_of_characteristic_using_value_handle_with_offset(callback, con_handle, value_handle, 0); 2732 } 2733 2734 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){ 2735 return gatt_client_read_long_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); 2736 } 2737 2738 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){ 2739 gatt_client_t * gatt_client; 2740 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2741 if (status != ERROR_CODE_SUCCESS){ 2742 return status; 2743 } 2744 2745 #ifdef ENABLE_GATT_OVER_EATT 2746 if (state == P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST){ 2747 if (gatt_client->bearer_type != ATT_BEARER_ENHANCED_LE){ 2748 return ERROR_CODE_COMMAND_DISALLOWED; 2749 } 2750 } 2751 #endif 2752 2753 gatt_client->callback = callback; 2754 gatt_client->read_multiple_handle_count = num_value_handles; 2755 gatt_client->read_multiple_handles = value_handles; 2756 gatt_client->state = state; 2757 gatt_client_run(); 2758 return ERROR_CODE_SUCCESS; 2759 } 2760 2761 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){ 2762 return gatt_client_read_multiple_characteristic_values_with_state(callback, con_handle, num_value_handles, value_handles, P_W2_SEND_READ_MULTIPLE_REQUEST); 2763 } 2764 2765 #ifdef ENABLE_GATT_OVER_EATT 2766 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){ 2767 return gatt_client_read_multiple_characteristic_values_with_state(callback, con_handle, num_value_handles, value_handles, P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST); 2768 } 2769 #endif 2770 2771 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){ 2772 gatt_client_t * gatt_client; 2773 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2774 if (status != ERROR_CODE_SUCCESS){ 2775 return status; 2776 } 2777 2778 if (value_length > (gatt_client->mtu - 3u)) return GATT_CLIENT_VALUE_TOO_LONG; 2779 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) return GATT_CLIENT_BUSY; 2780 2781 return att_write_request(gatt_client, ATT_WRITE_COMMAND, value_handle, value_length, value); 2782 } 2783 2784 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){ 2785 gatt_client_t * gatt_client; 2786 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2787 if (status != ERROR_CODE_SUCCESS){ 2788 return status; 2789 } 2790 2791 gatt_client->callback = callback; 2792 gatt_client->attribute_handle = value_handle; 2793 gatt_client->attribute_length = value_length; 2794 gatt_client->attribute_value = value; 2795 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 2796 gatt_client_run(); 2797 return ERROR_CODE_SUCCESS; 2798 } 2799 2800 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){ 2801 gatt_client_t * gatt_client; 2802 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2803 if (status != ERROR_CODE_SUCCESS){ 2804 return status; 2805 } 2806 2807 gatt_client->callback = callback; 2808 gatt_client->attribute_handle = value_handle; 2809 gatt_client->attribute_length = value_length; 2810 gatt_client->attribute_offset = offset; 2811 gatt_client->attribute_value = value; 2812 gatt_client->state = P_W2_PREPARE_WRITE; 2813 gatt_client_run(); 2814 return ERROR_CODE_SUCCESS; 2815 } 2816 2817 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){ 2818 return gatt_client_write_long_value_of_characteristic_with_offset(callback, con_handle, value_handle, 0, value_length, value); 2819 } 2820 2821 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){ 2822 gatt_client_t * gatt_client; 2823 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2824 if (status != ERROR_CODE_SUCCESS){ 2825 return status; 2826 } 2827 2828 gatt_client->callback = callback; 2829 gatt_client->attribute_handle = value_handle; 2830 gatt_client->attribute_length = value_length; 2831 gatt_client->attribute_offset = 0; 2832 gatt_client->attribute_value = value; 2833 gatt_client->state = P_W2_PREPARE_RELIABLE_WRITE; 2834 gatt_client_run(); 2835 return ERROR_CODE_SUCCESS; 2836 } 2837 2838 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){ 2839 gatt_client_t * gatt_client; 2840 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2841 if (status != ERROR_CODE_SUCCESS){ 2842 return status; 2843 } 2844 2845 if (configuration > 3){ 2846 return ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE; 2847 } 2848 2849 if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION) && 2850 ((characteristic->properties & ATT_PROPERTY_NOTIFY) == 0u)) { 2851 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED"); 2852 return GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED; 2853 } else if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION) && 2854 ((characteristic->properties & ATT_PROPERTY_INDICATE) == 0u)){ 2855 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED"); 2856 return GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED; 2857 } 2858 2859 gatt_client->callback = callback; 2860 gatt_client->start_group_handle = characteristic->value_handle; 2861 gatt_client->end_group_handle = characteristic->end_handle; 2862 little_endian_store_16(gatt_client->client_characteristic_configuration_value, 0, configuration); 2863 2864 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 2865 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2866 #else 2867 gatt_client->state = P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2868 #endif 2869 gatt_client_run(); 2870 return ERROR_CODE_SUCCESS; 2871 } 2872 2873 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){ 2874 gatt_client_t * gatt_client; 2875 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2876 if (status != ERROR_CODE_SUCCESS){ 2877 return status; 2878 } 2879 2880 gatt_client->callback = callback; 2881 gatt_client->attribute_handle = descriptor_handle; 2882 2883 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 2884 gatt_client_run(); 2885 return ERROR_CODE_SUCCESS; 2886 } 2887 2888 uint8_t gatt_client_read_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor){ 2889 return gatt_client_read_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2890 } 2891 2892 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){ 2893 gatt_client_t * gatt_client; 2894 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2895 if (status != ERROR_CODE_SUCCESS){ 2896 return status; 2897 } 2898 2899 gatt_client->callback = callback; 2900 gatt_client->attribute_handle = descriptor_handle; 2901 gatt_client->attribute_offset = offset; 2902 gatt_client->state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 2903 gatt_client_run(); 2904 return ERROR_CODE_SUCCESS; 2905 } 2906 2907 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){ 2908 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0); 2909 } 2910 2911 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){ 2912 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2913 } 2914 2915 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){ 2916 gatt_client_t * gatt_client; 2917 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2918 if (status != ERROR_CODE_SUCCESS){ 2919 return status; 2920 } 2921 2922 gatt_client->callback = callback; 2923 gatt_client->attribute_handle = descriptor_handle; 2924 gatt_client->attribute_length = value_length; 2925 gatt_client->attribute_offset = 0; 2926 gatt_client->attribute_value = value; 2927 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 2928 gatt_client_run(); 2929 return ERROR_CODE_SUCCESS; 2930 } 2931 2932 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){ 2933 return gatt_client_write_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); 2934 } 2935 2936 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){ 2937 gatt_client_t * gatt_client; 2938 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2939 if (status != ERROR_CODE_SUCCESS){ 2940 return status; 2941 } 2942 2943 gatt_client->callback = callback; 2944 gatt_client->attribute_handle = descriptor_handle; 2945 gatt_client->attribute_length = value_length; 2946 gatt_client->attribute_offset = offset; 2947 gatt_client->attribute_value = value; 2948 gatt_client->state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 2949 gatt_client_run(); 2950 return ERROR_CODE_SUCCESS; 2951 } 2952 2953 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){ 2954 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0, value_length, value); 2955 } 2956 2957 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){ 2958 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); 2959 } 2960 2961 /** 2962 * @brief -> gatt complete event 2963 */ 2964 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){ 2965 gatt_client_t * gatt_client; 2966 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2967 if (status != ERROR_CODE_SUCCESS){ 2968 return status; 2969 } 2970 2971 gatt_client->callback = callback; 2972 gatt_client->attribute_handle = attribute_handle; 2973 gatt_client->attribute_length = value_length; 2974 gatt_client->attribute_offset = offset; 2975 gatt_client->attribute_value = value; 2976 gatt_client->state = P_W2_PREPARE_WRITE_SINGLE; 2977 gatt_client_run(); 2978 return ERROR_CODE_SUCCESS; 2979 } 2980 2981 /** 2982 * @brief -> gatt complete event 2983 */ 2984 uint8_t gatt_client_execute_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2985 gatt_client_t * gatt_client; 2986 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2987 if (status != ERROR_CODE_SUCCESS){ 2988 return status; 2989 } 2990 2991 gatt_client->callback = callback; 2992 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE; 2993 gatt_client_run(); 2994 return ERROR_CODE_SUCCESS; 2995 } 2996 2997 /** 2998 * @brief -> gatt complete event 2999 */ 3000 uint8_t gatt_client_cancel_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3001 gatt_client_t * gatt_client; 3002 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 3003 if (status != ERROR_CODE_SUCCESS){ 3004 return status; 3005 } 3006 3007 gatt_client->callback = callback; 3008 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE; 3009 gatt_client_run(); 3010 return ERROR_CODE_SUCCESS; 3011 } 3012 3013 void gatt_client_deserialize_service(const uint8_t *packet, int offset, gatt_client_service_t * service){ 3014 service->start_group_handle = little_endian_read_16(packet, offset); 3015 service->end_group_handle = little_endian_read_16(packet, offset + 2); 3016 reverse_128(&packet[offset + 4], service->uuid128); 3017 if (uuid_has_bluetooth_prefix(service->uuid128)){ 3018 service->uuid16 = big_endian_read_32(service->uuid128, 0); 3019 } else { 3020 service->uuid16 = 0; 3021 } 3022 } 3023 3024 void gatt_client_deserialize_characteristic(const uint8_t * packet, int offset, gatt_client_characteristic_t * characteristic){ 3025 characteristic->start_handle = little_endian_read_16(packet, offset); 3026 characteristic->value_handle = little_endian_read_16(packet, offset + 2); 3027 characteristic->end_handle = little_endian_read_16(packet, offset + 4); 3028 characteristic->properties = little_endian_read_16(packet, offset + 6); 3029 reverse_128(&packet[offset+8], characteristic->uuid128); 3030 if (uuid_has_bluetooth_prefix(characteristic->uuid128)){ 3031 characteristic->uuid16 = big_endian_read_32(characteristic->uuid128, 0); 3032 } else { 3033 characteristic->uuid16 = 0; 3034 } 3035 } 3036 3037 void gatt_client_deserialize_characteristic_descriptor(const uint8_t * packet, int offset, gatt_client_characteristic_descriptor_t * descriptor){ 3038 descriptor->handle = little_endian_read_16(packet, offset); 3039 reverse_128(&packet[offset+2], descriptor->uuid128); 3040 if (uuid_has_bluetooth_prefix(descriptor->uuid128)){ 3041 descriptor->uuid16 = big_endian_read_32(descriptor->uuid128, 0); 3042 } else { 3043 descriptor->uuid16 = 0; 3044 } 3045 } 3046 3047 void gatt_client_send_mtu_negotiation(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3048 gatt_client_t * gatt_client; 3049 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3050 if (status != ERROR_CODE_SUCCESS){ 3051 return; 3052 } 3053 if (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED){ 3054 gatt_client->callback = callback; 3055 gatt_client->mtu_state = SEND_MTU_EXCHANGE; 3056 gatt_client_run(); 3057 } 3058 } 3059 3060 uint8_t gatt_client_request_to_write_without_response(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 3061 gatt_client_t * gatt_client; 3062 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3063 if (status != ERROR_CODE_SUCCESS){ 3064 return status; 3065 } 3066 bool added = btstack_linked_list_add_tail(&gatt_client->write_without_response_requests, (btstack_linked_item_t*) callback_registration); 3067 if (added == false){ 3068 return ERROR_CODE_COMMAND_DISALLOWED; 3069 } else { 3070 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 3071 return ERROR_CODE_SUCCESS; 3072 } 3073 } 3074 3075 uint8_t gatt_client_request_to_send_gatt_query(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 3076 gatt_client_t * gatt_client; 3077 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3078 if (status != ERROR_CODE_SUCCESS){ 3079 return status; 3080 } 3081 bool added = btstack_linked_list_add_tail(&gatt_client->query_requests, (btstack_linked_item_t*) callback_registration); 3082 if (added == false){ 3083 return ERROR_CODE_COMMAND_DISALLOWED; 3084 } else { 3085 gatt_client_notify_can_send_query(gatt_client); 3086 return ERROR_CODE_SUCCESS; 3087 } 3088 } 3089 3090 uint8_t gatt_client_remove_gatt_query(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 3091 gatt_client_t * gatt_client; 3092 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3093 if (status != ERROR_CODE_SUCCESS){ 3094 return status; 3095 } 3096 (void)btstack_linked_list_remove(&gatt_client->query_requests, (btstack_linked_item_t*) callback_registration); 3097 return ERROR_CODE_SUCCESS; 3098 } 3099 3100 uint8_t gatt_client_request_can_write_without_response_event(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3101 gatt_client_t * gatt_client; 3102 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3103 if (status != ERROR_CODE_SUCCESS){ 3104 return status; 3105 } 3106 if (gatt_client->write_without_response_callback != NULL){ 3107 return GATT_CLIENT_IN_WRONG_STATE; 3108 } 3109 gatt_client->write_without_response_callback = callback; 3110 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 3111 return ERROR_CODE_SUCCESS; 3112 } 3113 3114 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 3115 void gatt_client_add_service_changed_handler(btstack_packet_callback_registration_t * callback) { 3116 btstack_linked_list_add_tail(&gatt_client_service_changed_handler, (btstack_linked_item_t*) callback); 3117 } 3118 3119 void gatt_client_remove_service_changed_handler(btstack_packet_callback_registration_t * callback){ 3120 btstack_linked_list_remove(&gatt_client_service_changed_handler, (btstack_linked_item_t*) callback); 3121 } 3122 #endif 3123 3124 #if defined(ENABLE_GATT_OVER_CLASSIC) || defined(ENABLE_GATT_OVER_EATT) 3125 3126 #include "hci_event.h" 3127 3128 static const hci_event_t gatt_client_connected = { 3129 GATT_EVENT_CONNECTED, 0, "11BH" 3130 }; 3131 3132 static const hci_event_t gatt_client_disconnected = { 3133 GATT_EVENT_DISCONNECTED, 0, "H" 3134 }; 3135 3136 static void 3137 gatt_client_emit_connected(btstack_packet_handler_t callback, uint8_t status, bd_addr_type_t addr_type, bd_addr_t addr, 3138 hci_con_handle_t con_handle) { 3139 uint8_t buffer[20]; 3140 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_connected, status, addr, con_handle); 3141 (*callback)(HCI_EVENT_PACKET, 0, buffer, len); 3142 } 3143 3144 #endif 3145 3146 #ifdef ENABLE_GATT_OVER_CLASSIC 3147 3148 #include "bluetooth_psm.h" 3149 3150 // single active SDP query 3151 static gatt_client_t * gatt_client_classic_active_sdp_query; 3152 3153 // macos protocol descriptor list requires 16 bytes 3154 static uint8_t gatt_client_classic_sdp_buffer[32]; 3155 3156 3157 static gatt_client_t * gatt_client_get_context_for_classic_addr(bd_addr_t addr){ 3158 btstack_linked_item_t *it; 3159 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 3160 gatt_client_t * gatt_client = (gatt_client_t *) it; 3161 if (memcmp(gatt_client->addr, addr, 6) == 0){ 3162 return gatt_client; 3163 } 3164 } 3165 return NULL; 3166 } 3167 3168 static gatt_client_t * gatt_client_get_context_for_l2cap_cid(uint16_t l2cap_cid){ 3169 btstack_linked_item_t *it; 3170 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 3171 gatt_client_t * gatt_client = (gatt_client_t *) it; 3172 if (gatt_client->l2cap_cid == l2cap_cid){ 3173 return gatt_client; 3174 } 3175 } 3176 return NULL; 3177 } 3178 3179 static void gatt_client_classic_handle_connected(gatt_client_t * gatt_client, uint8_t status){ 3180 // cache peer information 3181 bd_addr_t addr; 3182 // cppcheck-suppress uninitvar ; addr is reported as uninitialized although it's the destination of the memcpy 3183 memcpy(addr, gatt_client->addr, 6); 3184 bd_addr_type_t addr_type = gatt_client->addr_type; 3185 gatt_client->addr_type = BD_ADDR_TYPE_ACL; 3186 hci_con_handle_t con_handle = gatt_client->con_handle; 3187 btstack_packet_handler_t callback = gatt_client->callback; 3188 3189 if (status != ERROR_CODE_SUCCESS){ 3190 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 3191 btstack_memory_gatt_client_free(gatt_client); 3192 } 3193 3194 gatt_client_emit_connected(callback, status, addr_type, addr, con_handle); 3195 } 3196 3197 static void gatt_client_classic_retry(btstack_timer_source_t * ts){ 3198 gatt_client_t * gatt_client = gatt_client_for_timer(ts); 3199 if (gatt_client != NULL){ 3200 gatt_client->state = P_W4_L2CAP_CONNECTION; 3201 att_dispatch_classic_connect(gatt_client->addr, gatt_client->l2cap_psm, &gatt_client->l2cap_cid); 3202 } 3203 } 3204 3205 static void gatt_client_classic_handle_disconnected(gatt_client_t * gatt_client){ 3206 3207 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 3208 gatt_client_timeout_stop(gatt_client); 3209 3210 hci_con_handle_t con_handle = gatt_client->con_handle; 3211 btstack_packet_handler_t callback = gatt_client->callback; 3212 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 3213 btstack_memory_gatt_client_free(gatt_client); 3214 3215 uint8_t buffer[20]; 3216 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_disconnected, con_handle); 3217 (*callback)(HCI_EVENT_PACKET, 0, buffer, len); 3218 } 3219 3220 static void gatt_client_handle_sdp_client_query_attribute_value(gatt_client_t * connection, uint8_t *packet){ 3221 des_iterator_t des_list_it; 3222 des_iterator_t prot_it; 3223 3224 if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= sizeof(gatt_client_classic_sdp_buffer)) { 3225 gatt_client_classic_sdp_buffer[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); 3226 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)) { 3227 switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) { 3228 case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST: 3229 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)) { 3230 uint8_t *des_element; 3231 uint8_t *element; 3232 uint32_t uuid; 3233 3234 if (des_iterator_get_type(&des_list_it) != DE_DES) continue; 3235 3236 des_element = des_iterator_get_element(&des_list_it); 3237 des_iterator_init(&prot_it, des_element); 3238 element = des_iterator_get_element(&prot_it); 3239 3240 if (de_get_element_type(element) != DE_UUID) continue; 3241 3242 uuid = de_get_uuid32(element); 3243 des_iterator_next(&prot_it); 3244 // we assume that the even if there are both roles supported, remote device uses the same psm and avdtp version for both 3245 switch (uuid){ 3246 case BLUETOOTH_PROTOCOL_L2CAP: 3247 if (!des_iterator_has_more(&prot_it)) continue; 3248 de_element_get_uint16(des_iterator_get_element(&prot_it), &connection->l2cap_psm); 3249 break; 3250 default: 3251 break; 3252 } 3253 } 3254 break; 3255 3256 default: 3257 break; 3258 } 3259 } 3260 } 3261 } 3262 3263 static void gatt_client_classic_sdp_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 3264 gatt_client_t * gatt_client = gatt_client_classic_active_sdp_query; 3265 btstack_assert(gatt_client != NULL); 3266 uint8_t status; 3267 3268 // TODO: handle sdp events, get l2cap psm 3269 switch (hci_event_packet_get_type(packet)){ 3270 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: 3271 gatt_client_handle_sdp_client_query_attribute_value(gatt_client, packet); 3272 // TODO: 3273 return; 3274 case SDP_EVENT_QUERY_COMPLETE: 3275 status = sdp_event_query_complete_get_status(packet); 3276 gatt_client_classic_active_sdp_query = NULL; 3277 log_info("l2cap psm: %0x, status %02x", gatt_client->l2cap_psm, status); 3278 if (status != ERROR_CODE_SUCCESS) break; 3279 if (gatt_client->l2cap_psm == 0) { 3280 status = SDP_SERVICE_NOT_FOUND; 3281 break; 3282 } 3283 break; 3284 default: 3285 btstack_assert(false); 3286 return; 3287 } 3288 3289 // done 3290 if (status == ERROR_CODE_SUCCESS){ 3291 gatt_client->state = P_W4_L2CAP_CONNECTION; 3292 status = att_dispatch_classic_connect(gatt_client->addr, gatt_client->l2cap_psm, &gatt_client->l2cap_cid); 3293 } 3294 if (status != ERROR_CODE_SUCCESS) { 3295 gatt_client_classic_handle_connected(gatt_client, status); 3296 } 3297 } 3298 3299 static void gatt_client_classic_sdp_start(void * context){ 3300 gatt_client_classic_active_sdp_query = (gatt_client_t *) context; 3301 gatt_client_classic_active_sdp_query->state = P_W4_SDP_QUERY; 3302 sdp_client_query_uuid16(gatt_client_classic_sdp_handler, gatt_client_classic_active_sdp_query->addr, ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 3303 } 3304 3305 static void gatt_client_classic_emit_connected(void * context){ 3306 gatt_client_t * gatt_client = (gatt_client_t *) context; 3307 gatt_client->state = P_READY; 3308 gatt_client_emit_connected(gatt_client->callback, ERROR_CODE_SUCCESS, gatt_client->addr_type, gatt_client->addr, gatt_client->con_handle); 3309 } 3310 3311 uint8_t gatt_client_classic_connect(btstack_packet_handler_t callback, bd_addr_t addr){ 3312 gatt_client_t * gatt_client = gatt_client_get_context_for_classic_addr(addr); 3313 if (gatt_client != NULL){ 3314 return ERROR_CODE_ACL_CONNECTION_ALREADY_EXISTS; 3315 } 3316 gatt_client = btstack_memory_gatt_client_get(); 3317 if (gatt_client == NULL){ 3318 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 3319 } 3320 // init state 3321 gatt_client->bearer_type = ATT_BEARER_UNENHANCED_CLASSIC; 3322 gatt_client->con_handle = HCI_CON_HANDLE_INVALID; 3323 memcpy(gatt_client->addr, addr, 6); 3324 gatt_client->addr_type = BD_ADDR_TYPE_ACL; 3325 gatt_client->mtu = ATT_DEFAULT_MTU; 3326 gatt_client->security_level = LEVEL_0; 3327 gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 3328 gatt_client->callback = callback; 3329 #ifdef ENABLE_GATT_OVER_EATT 3330 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3331 #endif 3332 btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); 3333 3334 // schedule emitted event if already connected, otherwise 3335 bool already_connected = false; 3336 hci_connection_t * hci_connection = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL); 3337 if (hci_connection != NULL){ 3338 if (hci_connection->att_server.l2cap_cid != 0){ 3339 already_connected = true; 3340 } 3341 } 3342 gatt_client->callback_request.context = gatt_client; 3343 if (already_connected){ 3344 gatt_client->con_handle = hci_connection->con_handle; 3345 gatt_client->callback_request.callback = &gatt_client_classic_emit_connected; 3346 gatt_client->state = P_W2_EMIT_CONNECTED; 3347 btstack_run_loop_execute_on_main_thread(&gatt_client->callback_request); 3348 } else { 3349 gatt_client->callback_request.callback = &gatt_client_classic_sdp_start; 3350 gatt_client->state = P_W2_SDP_QUERY; 3351 sdp_client_register_query_callback(&gatt_client->callback_request); 3352 } 3353 return ERROR_CODE_SUCCESS; 3354 } 3355 3356 uint8_t gatt_client_classic_disconnect(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3357 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 3358 if (gatt_client == NULL){ 3359 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 3360 } 3361 gatt_client->callback = callback; 3362 return l2cap_disconnect(gatt_client->l2cap_cid); 3363 } 3364 #endif 3365 3366 #ifdef ENABLE_GATT_OVER_EATT 3367 3368 #define MAX_NR_EATT_CHANNELS 5 3369 3370 static void gatt_client_le_enhanced_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 3371 3372 static uint8_t gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client_t * gatt_client, gatt_client_state_t state){ 3373 uint8_t num_clients = 0; 3374 btstack_linked_list_iterator_t it; 3375 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 3376 while (btstack_linked_list_iterator_has_next(&it)){ 3377 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3378 if (eatt_client->state == state){ 3379 num_clients++; 3380 } 3381 } 3382 return num_clients; 3383 } 3384 3385 static void gatt_client_eatt_finalize(gatt_client_t * gatt_client) { 3386 // free eatt clients 3387 btstack_linked_list_iterator_t it; 3388 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3389 while (btstack_linked_list_iterator_has_next(&it)) { 3390 gatt_client_t *eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3391 btstack_linked_list_iterator_remove(&it); 3392 btstack_memory_gatt_client_free(eatt_client); 3393 } 3394 } 3395 3396 // all channels connected 3397 static void gatt_client_le_enhanced_handle_connected(gatt_client_t * gatt_client, uint8_t status) { 3398 if (status == ERROR_CODE_SUCCESS){ 3399 uint8_t num_ready = gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client, P_READY); 3400 if (num_ready > 0){ 3401 gatt_client->eatt_state = GATT_CLIENT_EATT_READY; 3402 // free unused channels 3403 btstack_linked_list_iterator_t it; 3404 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3405 while (btstack_linked_list_iterator_has_next(&it)) { 3406 gatt_client_t *eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3407 if (eatt_client->state == P_L2CAP_CLOSED){ 3408 btstack_linked_list_iterator_remove(&it); 3409 btstack_memory_gatt_client_free(eatt_client); 3410 } 3411 } 3412 } else { 3413 hci_connection_t * hci_connection = hci_connection_for_handle(gatt_client->con_handle); 3414 btstack_assert(hci_connection != NULL); 3415 if (hci_connection->att_server.incoming_connection_request){ 3416 hci_connection->att_server.incoming_connection_request = false; 3417 log_info("Collision, retry in 100ms"); 3418 gatt_client->state = P_W2_L2CAP_CONNECT; 3419 // set timer for retry 3420 btstack_run_loop_set_timer(&gatt_client->gc_timeout, GATT_CLIENT_COLLISION_BACKOFF_MS); 3421 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_le_enhanced_retry); 3422 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 3423 return; 3424 } else { 3425 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3426 status = ERROR_CODE_CONNECTION_REJECTED_DUE_TO_LIMITED_RESOURCES; 3427 } 3428 } 3429 } else { 3430 gatt_client_eatt_finalize(gatt_client); 3431 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3432 } 3433 3434 gatt_client_emit_connected(gatt_client->callback, status, gatt_client->addr_type, gatt_client->addr, gatt_client->con_handle); 3435 } 3436 3437 // single channel disconnected 3438 static void gatt_client_le_enhanced_handle_ecbm_disconnected(gatt_client_t * gatt_client, gatt_client_t * eatt_client) { 3439 3440 // report error 3441 gatt_client_report_error_if_pending(eatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 3442 3443 // free memory 3444 btstack_linked_list_remove(&gatt_client->eatt_clients, (btstack_linked_item_t *) eatt_client); 3445 btstack_memory_gatt_client_free(eatt_client); 3446 3447 // last channel 3448 if (btstack_linked_list_empty(&gatt_client->eatt_clients)){ 3449 hci_connection_t * hci_connection = hci_connection_for_handle(gatt_client->con_handle); 3450 hci_connection->att_server.eatt_outgoing_active = false; 3451 3452 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY) { 3453 // report disconnected if last channel closed 3454 uint8_t buffer[20]; 3455 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_disconnected, gatt_client->con_handle); 3456 (*gatt_client->callback)(HCI_EVENT_PACKET, 0, buffer, len); 3457 } 3458 } 3459 } 3460 3461 static gatt_client_t * gatt_client_le_enhanced_get_context_for_l2cap_cid(uint16_t l2cap_cid, gatt_client_t ** out_eatt_client){ 3462 btstack_linked_list_iterator_t it; 3463 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3464 while (btstack_linked_list_iterator_has_next(&it)) { 3465 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3466 btstack_linked_list_iterator_t it2; 3467 btstack_linked_list_iterator_init(&it2, &gatt_client->eatt_clients); 3468 while (btstack_linked_list_iterator_has_next(&it2)) { 3469 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it2); 3470 if (eatt_client->l2cap_cid == l2cap_cid){ 3471 *out_eatt_client = eatt_client; 3472 return gatt_client; 3473 } 3474 } 3475 } 3476 return NULL; 3477 } 3478 3479 static void gatt_client_le_enhanced_setup_l2cap_channel(gatt_client_t * gatt_client){ 3480 uint8_t num_channels = gatt_client->eatt_num_clients; 3481 3482 // setup channels 3483 uint16_t buffer_size_per_client = gatt_client->eatt_storage_size / num_channels; 3484 uint16_t max_mtu = (buffer_size_per_client - REPORT_PREBUFFER_HEADER) / 2; 3485 uint8_t * receive_buffers[MAX_NR_EATT_CHANNELS]; 3486 uint16_t new_cids[MAX_NR_EATT_CHANNELS]; 3487 memset(gatt_client->eatt_storage_buffer, 0, gatt_client->eatt_storage_size); 3488 uint8_t i; 3489 for (i=0;i<gatt_client->eatt_num_clients; i++){ 3490 receive_buffers[i] = &gatt_client->eatt_storage_buffer[REPORT_PREBUFFER_HEADER]; 3491 gatt_client->eatt_storage_buffer += REPORT_PREBUFFER_HEADER + max_mtu; 3492 } 3493 3494 log_info("%u EATT clients with receive buffer size %u", gatt_client->eatt_num_clients, buffer_size_per_client); 3495 3496 uint8_t status = l2cap_ecbm_create_channels(&gatt_client_le_enhanced_packet_handler, 3497 gatt_client->con_handle, 3498 gatt_client->security_level, 3499 BLUETOOTH_PSM_EATT, num_channels, 3500 L2CAP_LE_AUTOMATIC_CREDITS, 3501 buffer_size_per_client, 3502 receive_buffers, 3503 new_cids); 3504 3505 if (status == ERROR_CODE_SUCCESS){ 3506 i = 0; 3507 btstack_linked_list_iterator_t it; 3508 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 3509 while (btstack_linked_list_iterator_has_next(&it)) { 3510 gatt_client_t *new_eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3511 3512 // init state with new cid and transmit buffer 3513 new_eatt_client->bearer_type = ATT_BEARER_ENHANCED_LE; 3514 new_eatt_client->con_handle = gatt_client->con_handle; 3515 new_eatt_client->mtu = 64; 3516 new_eatt_client->security_level = LEVEL_0; 3517 new_eatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 3518 new_eatt_client->state = P_W4_L2CAP_CONNECTION; 3519 new_eatt_client->l2cap_cid = new_cids[i]; 3520 new_eatt_client->eatt_storage_buffer = gatt_client->eatt_storage_buffer; 3521 gatt_client->eatt_storage_buffer += max_mtu; 3522 i++; 3523 } 3524 gatt_client->eatt_state = GATT_CLIENT_EATT_L2CAP_SETUP; 3525 } else { 3526 gatt_client_le_enhanced_handle_connected(gatt_client, status); 3527 } 3528 } 3529 3530 static void gatt_client_le_enhanced_retry(btstack_timer_source_t * ts){ 3531 gatt_client_t * gatt_client = gatt_client_for_timer(ts); 3532 if (gatt_client != NULL){ 3533 gatt_client->state = P_W4_L2CAP_CONNECTION; 3534 gatt_client_le_enhanced_setup_l2cap_channel(gatt_client); 3535 } 3536 } 3537 3538 static void gatt_client_le_enhanced_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) { 3539 gatt_client_t *gatt_client; 3540 gatt_client_t *eatt_client; 3541 hci_con_handle_t con_handle; 3542 uint16_t l2cap_cid; 3543 uint8_t status; 3544 gatt_client_characteristic_t characteristic; 3545 gatt_client_service_t service; 3546 switch (packet_type) { 3547 case HCI_EVENT_PACKET: 3548 switch (hci_event_packet_get_type(packet)) { 3549 case GATT_EVENT_SERVICE_QUERY_RESULT: 3550 con_handle = gatt_event_service_query_result_get_handle(packet); 3551 gatt_client = gatt_client_get_context_for_handle(con_handle); 3552 btstack_assert(gatt_client != NULL); 3553 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE); 3554 gatt_event_service_query_result_get_service(packet, &service); 3555 gatt_client->gatt_service_start_group_handle = service.start_group_handle; 3556 gatt_client->gatt_service_end_group_handle = service.end_group_handle; 3557 break; 3558 case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: 3559 con_handle = gatt_event_characteristic_value_query_result_get_handle(packet); 3560 gatt_client = gatt_client_get_context_for_handle(con_handle); 3561 btstack_assert(gatt_client != NULL); 3562 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE); 3563 if (gatt_event_characteristic_value_query_result_get_value_length(packet) >= 1) { 3564 gatt_client->gatt_server_supported_features = gatt_event_characteristic_value_query_result_get_value(packet)[0]; 3565 } 3566 break; 3567 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 3568 con_handle = gatt_event_characteristic_query_result_get_handle(packet); 3569 gatt_client = gatt_client_get_context_for_handle(con_handle); 3570 btstack_assert(gatt_client != NULL); 3571 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE); 3572 gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic); 3573 gatt_client->gatt_client_supported_features_handle = characteristic.value_handle; 3574 break; 3575 case GATT_EVENT_QUERY_COMPLETE: 3576 con_handle = gatt_event_query_complete_get_handle(packet); 3577 gatt_client = gatt_client_get_context_for_handle(con_handle); 3578 btstack_assert(gatt_client != NULL); 3579 switch (gatt_client->eatt_state){ 3580 case GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE: 3581 if (gatt_client->gatt_service_start_group_handle == 0){ 3582 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3583 } else { 3584 gatt_client->eatt_state = GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W2_SEND; 3585 } 3586 break; 3587 case GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE: 3588 if ((gatt_client->gatt_server_supported_features & 1) == 0) { 3589 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3590 } else { 3591 gatt_client->eatt_state = GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W2_SEND; 3592 } 3593 break; 3594 case GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE: 3595 if (gatt_client->gatt_client_supported_features_handle == 0){ 3596 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3597 } else { 3598 gatt_client->eatt_state = GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W2_SEND; 3599 } 3600 break; 3601 case GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W4_DONE: 3602 gatt_client_le_enhanced_setup_l2cap_channel(gatt_client); 3603 break; 3604 default: 3605 break; 3606 } 3607 break; 3608 case L2CAP_EVENT_ECBM_CHANNEL_OPENED: 3609 l2cap_cid = l2cap_event_ecbm_channel_opened_get_local_cid(packet); 3610 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(l2cap_cid, &eatt_client); 3611 3612 btstack_assert(gatt_client != NULL); 3613 btstack_assert(eatt_client != NULL); 3614 btstack_assert(eatt_client->state == P_W4_L2CAP_CONNECTION); 3615 3616 status = l2cap_event_channel_opened_get_status(packet); 3617 if (status == ERROR_CODE_SUCCESS){ 3618 eatt_client->state = P_READY; 3619 eatt_client->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); 3620 } else { 3621 eatt_client->state = P_L2CAP_CLOSED; 3622 } 3623 // connected if opened event for all channels received 3624 if (gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client, P_W4_L2CAP_CONNECTION) == 0){ 3625 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_SUCCESS); 3626 } 3627 break; 3628 case L2CAP_EVENT_CHANNEL_CLOSED: 3629 l2cap_cid = l2cap_event_channel_closed_get_local_cid(packet); 3630 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(l2cap_cid, &eatt_client); 3631 btstack_assert(gatt_client != NULL); 3632 btstack_assert(eatt_client != NULL); 3633 gatt_client_le_enhanced_handle_ecbm_disconnected(gatt_client, eatt_client); 3634 break; 3635 default: 3636 break; 3637 } 3638 break; 3639 case L2CAP_DATA_PACKET: 3640 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(channel, &eatt_client); 3641 btstack_assert(gatt_client != NULL); 3642 btstack_assert(eatt_client != NULL); 3643 gatt_client_handle_att_response(eatt_client, packet, size); 3644 gatt_client_run(); 3645 break; 3646 default: 3647 break; 3648 } 3649 } 3650 3651 static bool gatt_client_le_enhanced_handle_can_send_query(gatt_client_t * gatt_client){ 3652 uint8_t status = ERROR_CODE_SUCCESS; 3653 uint8_t gatt_client_supported_features = 0x06; // eatt + multiple value notifications 3654 switch (gatt_client->eatt_state){ 3655 case GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W2_SEND: 3656 gatt_client->gatt_service_start_group_handle = 0; 3657 gatt_client->eatt_state = GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE; 3658 status = gatt_client_discover_primary_services_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3659 gatt_client->con_handle, 3660 ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 3661 break; 3662 case GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W2_SEND: 3663 gatt_client->gatt_server_supported_features = 0; 3664 gatt_client->eatt_state = GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE; 3665 status = gatt_client_read_value_of_characteristics_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3666 gatt_client->con_handle, 3667 gatt_client->gatt_service_start_group_handle, 3668 gatt_client->gatt_service_end_group_handle, 3669 ORG_BLUETOOTH_CHARACTERISTIC_SERVER_SUPPORTED_FEATURES); 3670 return true; 3671 case GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W2_SEND: 3672 gatt_client->gatt_client_supported_features_handle = 0; 3673 gatt_client->eatt_state = GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE; 3674 status = gatt_client_discover_characteristics_for_handle_range_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3675 gatt_client->con_handle, 3676 gatt_client->gatt_service_start_group_handle, 3677 gatt_client->gatt_service_end_group_handle, 3678 ORG_BLUETOOTH_CHARACTERISTIC_CLIENT_SUPPORTED_FEATURES); 3679 return true; 3680 case GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W2_SEND: 3681 gatt_client->eatt_state = GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W4_DONE; 3682 status = gatt_client_write_value_of_characteristic(&gatt_client_le_enhanced_packet_handler, gatt_client->con_handle, 3683 gatt_client->gatt_client_supported_features_handle, 1, 3684 &gatt_client_supported_features); 3685 return true; 3686 default: 3687 break; 3688 } 3689 btstack_assert(status == ERROR_CODE_SUCCESS); 3690 UNUSED(status); 3691 return false; 3692 } 3693 3694 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) { 3695 gatt_client_t * gatt_client; 3696 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3697 if (status != ERROR_CODE_SUCCESS){ 3698 return status; 3699 } 3700 3701 if (gatt_client->eatt_state != GATT_CLIENT_EATT_IDLE){ 3702 return ERROR_CODE_COMMAND_DISALLOWED; 3703 } 3704 3705 // need one buffer for sending and one for receiving. Receiving includes pre-buffer for reports 3706 uint16_t buffer_size_per_client = storage_size / num_channels; 3707 uint16_t max_mtu = (buffer_size_per_client - REPORT_PREBUFFER_HEADER) / 2; 3708 if (max_mtu < 64) { 3709 return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS; 3710 } 3711 3712 if ((num_channels == 0) || (num_channels > MAX_NR_EATT_CHANNELS)){ 3713 return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS; 3714 } 3715 3716 // create max num_channel eatt clients 3717 uint8_t i; 3718 btstack_linked_list_t eatt_clients = NULL; 3719 for (i=0;i<num_channels;i++) { 3720 gatt_client_t * new_gatt_client = btstack_memory_gatt_client_get(); 3721 if (new_gatt_client == NULL) { 3722 break; 3723 } 3724 btstack_linked_list_add(&eatt_clients, (btstack_linked_item_t*)new_gatt_client); 3725 } 3726 3727 if (i != num_channels){ 3728 while (true){ 3729 gatt_client = (gatt_client_t *) btstack_linked_list_pop(&eatt_clients); 3730 if (gatt_client == NULL) { 3731 break; 3732 } 3733 btstack_memory_gatt_client_free(gatt_client); 3734 } 3735 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 3736 } 3737 3738 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 3739 hci_connection->att_server.eatt_outgoing_active = true; 3740 3741 gatt_client->callback = callback; 3742 gatt_client->eatt_num_clients = num_channels; 3743 gatt_client->eatt_storage_buffer = storage_buffer; 3744 gatt_client->eatt_storage_size = storage_size; 3745 gatt_client->eatt_clients = eatt_clients; 3746 gatt_client->eatt_state = GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W2_SEND; 3747 gatt_client_notify_can_send_query(gatt_client); 3748 3749 return ERROR_CODE_SUCCESS; 3750 } 3751 3752 #endif 3753 3754 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 3755 void gatt_client_att_packet_handler_fuzz(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 3756 gatt_client_att_packet_handler(packet_type, handle, packet, size); 3757 } 3758 3759 uint8_t gatt_client_get_client(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 3760 uint8_t status = gatt_client_provide_context_for_handle(con_handle, out_gatt_client); 3761 return status; 3762 } 3763 #endif 3764