1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN 24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "gatt_client.c" 39 40 #include <stdint.h> 41 #include <string.h> 42 #include <stddef.h> 43 44 #include "btstack_config.h" 45 46 #include "ble/att_dispatch.h" 47 #include "ble/att_db.h" 48 #include "ble/gatt_client.h" 49 #include "ble/le_device_db.h" 50 #include "ble/sm.h" 51 #include "bluetooth_psm.h" 52 #include "btstack_debug.h" 53 #include "btstack_event.h" 54 #include "btstack_memory.h" 55 #include "btstack_run_loop.h" 56 #include "btstack_util.h" 57 #include "hci.h" 58 #include "hci_dump.h" 59 #include "hci_event_builder.h" 60 #include "l2cap.h" 61 #include "classic/sdp_client.h" 62 #include "bluetooth_gatt.h" 63 #include "bluetooth_sdp.h" 64 #include "classic/sdp_util.h" 65 66 #if defined(ENABLE_GATT_OVER_EATT) && !defined(ENABLE_L2CAP_ENHANCED_CREDIT_BASED_FLOW_CONTROL_MODE) 67 #error "GATT Over EATT requires support for L2CAP Enhanced CoC. Please enable ENABLE_L2CAP_ENHANCED_CREDIT_BASED_FLOW_CONTROL_MODE" 68 #endif 69 70 // L2CAP Test Spec p35 defines a minimum of 100 ms, but PTS might indicate an error if we sent after 100 ms 71 #define GATT_CLIENT_COLLISION_BACKOFF_MS 150 72 73 static btstack_linked_list_t gatt_client_connections; 74 static btstack_linked_list_t gatt_client_value_listeners; 75 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 76 static btstack_linked_list_t gatt_client_service_changed_handler; 77 #endif 78 static btstack_packet_callback_registration_t hci_event_callback_registration; 79 static btstack_packet_callback_registration_t sm_event_callback_registration; 80 static btstack_context_callback_registration_t gatt_client_deferred_event_emit; 81 82 // GATT Client Configuration 83 static bool gatt_client_mtu_exchange_enabled; 84 static gap_security_level_t gatt_client_required_security_level; 85 86 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size); 87 static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 88 static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code); 89 90 #ifdef ENABLE_LE_SIGNED_WRITE 91 static void att_signed_write_handle_cmac_result(uint8_t hash[8]); 92 #endif 93 94 #ifdef ENABLE_GATT_OVER_CLASSIC 95 static gatt_client_t * gatt_client_get_context_for_l2cap_cid(uint16_t l2cap_cid); 96 static void gatt_client_classic_handle_connected(gatt_client_t * gatt_client, uint8_t status); 97 static void gatt_client_classic_handle_disconnected(gatt_client_t * gatt_client); 98 static void gatt_client_classic_retry(btstack_timer_source_t * ts); 99 #endif 100 101 #ifdef ENABLE_GATT_OVER_EATT 102 static bool gatt_client_le_enhanced_handle_can_send_query(gatt_client_t * gatt_client); 103 static void gatt_client_le_enhanced_retry(btstack_timer_source_t * ts); 104 #endif 105 106 void gatt_client_init(void){ 107 gatt_client_connections = NULL; 108 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 109 gatt_client_service_changed_handler = NULL; 110 #endif 111 // default configuration 112 gatt_client_mtu_exchange_enabled = true; 113 gatt_client_required_security_level = LEVEL_0; 114 115 // register for HCI Events 116 hci_event_callback_registration.callback = &gatt_client_event_packet_handler; 117 hci_add_event_handler(&hci_event_callback_registration); 118 119 // register for SM Events 120 sm_event_callback_registration.callback = &gatt_client_event_packet_handler; 121 sm_add_event_handler(&sm_event_callback_registration); 122 123 // and ATT Client PDUs 124 att_dispatch_register_client(gatt_client_att_packet_handler); 125 } 126 127 void gatt_client_set_required_security_level(gap_security_level_t level){ 128 gatt_client_required_security_level = level; 129 } 130 131 static gatt_client_t * gatt_client_for_timer(btstack_timer_source_t * ts){ 132 btstack_linked_list_iterator_t it; 133 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 134 while (btstack_linked_list_iterator_has_next(&it)){ 135 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 136 if (&gatt_client->gc_timeout == ts) { 137 return gatt_client; 138 } 139 } 140 return NULL; 141 } 142 143 static void gatt_client_timeout_handler(btstack_timer_source_t * timer){ 144 gatt_client_t * gatt_client = gatt_client_for_timer(timer); 145 if (gatt_client == NULL) return; 146 log_info("GATT client timeout handle, handle 0x%02x", gatt_client->con_handle); 147 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_TIMEOUT); 148 } 149 150 static void gatt_client_timeout_start(gatt_client_t * gatt_client){ 151 log_debug("GATT client timeout start, handle 0x%02x", gatt_client->con_handle); 152 btstack_run_loop_remove_timer(&gatt_client->gc_timeout); 153 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_timeout_handler); 154 btstack_run_loop_set_timer(&gatt_client->gc_timeout, 30000); // 30 seconds sm timeout 155 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 156 } 157 158 static void gatt_client_timeout_stop(gatt_client_t * gatt_client){ 159 log_debug("GATT client timeout stop, handle 0x%02x", gatt_client->con_handle); 160 btstack_run_loop_remove_timer(&gatt_client->gc_timeout); 161 } 162 163 static gap_security_level_t gatt_client_le_security_level_for_connection(hci_con_handle_t con_handle){ 164 uint8_t encryption_key_size = gap_encryption_key_size(con_handle); 165 if (encryption_key_size == 0) return LEVEL_0; 166 167 bool authenticated = gap_authenticated(con_handle); 168 if (!authenticated) return LEVEL_2; 169 170 return encryption_key_size == 16 ? LEVEL_4 : LEVEL_3; 171 } 172 173 static gatt_client_t * gatt_client_get_context_for_handle(uint16_t handle){ 174 btstack_linked_item_t *it; 175 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 176 gatt_client_t * gatt_client = (gatt_client_t *) it; 177 if (gatt_client->con_handle == handle){ 178 return gatt_client; 179 } 180 } 181 return NULL; 182 } 183 184 185 // @return gatt_client context 186 // returns existing one, or tries to setup new one 187 static uint8_t gatt_client_provide_context_for_handle(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 188 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 189 190 if (gatt_client != NULL){ 191 *out_gatt_client = gatt_client; 192 return ERROR_CODE_SUCCESS; 193 } 194 195 // bail if no such hci connection 196 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 197 if (hci_connection == NULL){ 198 log_error("No connection for handle 0x%04x", con_handle); 199 *out_gatt_client = NULL; 200 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 201 } 202 203 gatt_client = btstack_memory_gatt_client_get(); 204 if (gatt_client == NULL){ 205 *out_gatt_client = NULL; 206 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 207 } 208 // init state 209 gatt_client->bearer_type = ATT_BEARER_UNENHANCED_LE; 210 gatt_client->con_handle = con_handle; 211 gatt_client->mtu = ATT_DEFAULT_MTU; 212 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 213 if (gatt_client_mtu_exchange_enabled){ 214 gatt_client->mtu_state = SEND_MTU_EXCHANGE; 215 } else { 216 gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 217 } 218 gatt_client->state = P_READY; 219 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_W2_SEND; 220 #ifdef ENABLE_GATT_OVER_EATT 221 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 222 #endif 223 btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); 224 225 // get unenhanced att bearer state 226 if (hci_connection->att_connection.mtu_exchanged){ 227 gatt_client->mtu = hci_connection->att_connection.mtu; 228 gatt_client->mtu_state = MTU_EXCHANGED; 229 } 230 *out_gatt_client = gatt_client; 231 return ERROR_CODE_SUCCESS; 232 } 233 234 static bool is_ready(gatt_client_t * gatt_client){ 235 return gatt_client->state == P_READY; 236 } 237 238 static uint8_t gatt_client_provide_context_for_request(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 239 gatt_client_t * gatt_client = NULL; 240 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 241 if (status != ERROR_CODE_SUCCESS){ 242 return status; 243 } 244 245 #ifdef ENABLE_GATT_OVER_EATT 246 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY){ 247 btstack_linked_list_iterator_t it; 248 gatt_client_t * eatt_client = NULL; 249 // find free eatt client 250 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 251 while (btstack_linked_list_iterator_has_next(&it)){ 252 gatt_client_t * client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 253 if (client->state == P_READY){ 254 eatt_client = client; 255 break; 256 } 257 } 258 if (eatt_client == NULL){ 259 return ERROR_CODE_COMMAND_DISALLOWED; 260 } 261 gatt_client = eatt_client; 262 } 263 #endif 264 265 if (is_ready(gatt_client) == false){ 266 return GATT_CLIENT_IN_WRONG_STATE; 267 } 268 269 gatt_client_timeout_start(gatt_client); 270 271 *out_gatt_client = gatt_client; 272 273 return status; 274 } 275 276 int gatt_client_is_ready(hci_con_handle_t con_handle){ 277 gatt_client_t * gatt_client; 278 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 279 if (status != ERROR_CODE_SUCCESS){ 280 return 0; 281 } 282 return is_ready(gatt_client) ? 1 : 0; 283 } 284 285 void gatt_client_mtu_enable_auto_negotiation(uint8_t enabled){ 286 gatt_client_mtu_exchange_enabled = enabled != 0; 287 } 288 289 uint8_t gatt_client_get_mtu(hci_con_handle_t con_handle, uint16_t * mtu){ 290 gatt_client_t * gatt_client; 291 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 292 if (status != ERROR_CODE_SUCCESS){ 293 return status; 294 } 295 296 if ((gatt_client->mtu_state == MTU_EXCHANGED) || (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED)){ 297 *mtu = gatt_client->mtu; 298 return ERROR_CODE_SUCCESS; 299 } 300 *mtu = ATT_DEFAULT_MTU; 301 return GATT_CLIENT_IN_WRONG_STATE; 302 } 303 304 static uint8_t *gatt_client_reserve_request_buffer(gatt_client_t *gatt_client) { 305 switch (gatt_client->bearer_type){ 306 #ifdef ENABLE_GATT_OVER_CLASSIC 307 case ATT_BEARER_UNENHANCED_CLASSIC: 308 #endif 309 case ATT_BEARER_UNENHANCED_LE: 310 l2cap_reserve_packet_buffer(); 311 return l2cap_get_outgoing_buffer(); 312 #ifdef ENABLE_GATT_OVER_EATT 313 case ATT_BEARER_ENHANCED_LE: 314 return gatt_client->eatt_storage_buffer; 315 #endif 316 default: 317 btstack_unreachable(); 318 break; 319 } 320 return NULL; 321 } 322 323 // precondition: can_send_packet_now == TRUE 324 static uint8_t gatt_client_send(gatt_client_t * gatt_client, uint16_t len){ 325 switch (gatt_client->bearer_type){ 326 case ATT_BEARER_UNENHANCED_LE: 327 return l2cap_send_prepared_connectionless(gatt_client->con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, len); 328 #ifdef ENABLE_GATT_OVER_CLASSIC 329 case ATT_BEARER_UNENHANCED_CLASSIC: 330 return l2cap_send_prepared(gatt_client->l2cap_cid, len); 331 #endif 332 #ifdef ENABLE_GATT_OVER_EATT 333 case ATT_BEARER_ENHANCED_LE: 334 return l2cap_send(gatt_client->l2cap_cid, gatt_client->eatt_storage_buffer, len); 335 #endif 336 default: 337 btstack_unreachable(); 338 return ERROR_CODE_HARDWARE_FAILURE; 339 } 340 } 341 342 // precondition: can_send_packet_now == TRUE 343 static uint8_t att_confirmation(gatt_client_t * gatt_client) { 344 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 345 346 request[0] = ATT_HANDLE_VALUE_CONFIRMATION; 347 348 return gatt_client_send(gatt_client, 1); 349 } 350 351 // precondition: can_send_packet_now == TRUE 352 static uint8_t att_find_information_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t start_handle, 353 uint16_t end_handle) { 354 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 355 356 request[0] = request_type; 357 little_endian_store_16(request, 1, start_handle); 358 little_endian_store_16(request, 3, end_handle); 359 360 return gatt_client_send(gatt_client, 5); 361 } 362 363 // precondition: can_send_packet_now == TRUE 364 static uint8_t 365 att_find_by_type_value_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_group_type, 366 uint16_t start_handle, uint16_t end_handle, uint8_t *value, uint16_t value_size) { 367 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 368 request[0] = request_type; 369 370 little_endian_store_16(request, 1, start_handle); 371 little_endian_store_16(request, 3, end_handle); 372 little_endian_store_16(request, 5, attribute_group_type); 373 (void)memcpy(&request[7], value, value_size); 374 375 return gatt_client_send(gatt_client, 7u + value_size); 376 } 377 378 // precondition: can_send_packet_now == TRUE 379 static uint8_t 380 att_read_by_type_or_group_request_for_uuid16(gatt_client_t *gatt_client, uint8_t request_type, uint16_t uuid16, 381 uint16_t start_handle, uint16_t end_handle) { 382 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 383 384 request[0] = request_type; 385 little_endian_store_16(request, 1, start_handle); 386 little_endian_store_16(request, 3, end_handle); 387 little_endian_store_16(request, 5, uuid16); 388 389 return gatt_client_send(gatt_client, 7); 390 } 391 392 // precondition: can_send_packet_now == TRUE 393 static uint8_t 394 att_read_by_type_or_group_request_for_uuid128(gatt_client_t *gatt_client, uint8_t request_type, const uint8_t *uuid128, 395 uint16_t start_handle, uint16_t end_handle) { 396 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 397 398 request[0] = request_type; 399 little_endian_store_16(request, 1, start_handle); 400 little_endian_store_16(request, 3, end_handle); 401 reverse_128(uuid128, &request[5]); 402 403 return gatt_client_send(gatt_client, 21); 404 } 405 406 // precondition: can_send_packet_now == TRUE 407 static uint8_t att_read_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle) { 408 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 409 410 request[0] = request_type; 411 little_endian_store_16(request, 1, attribute_handle); 412 413 return gatt_client_send(gatt_client, 3); 414 } 415 416 // precondition: can_send_packet_now == TRUE 417 static uint8_t att_read_blob_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, 418 uint16_t value_offset) { 419 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 420 421 request[0] = request_type; 422 little_endian_store_16(request, 1, attribute_handle); 423 little_endian_store_16(request, 3, value_offset); 424 425 return gatt_client_send(gatt_client, 5); 426 } 427 428 static uint8_t 429 att_read_multiple_request_with_opcode(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles, uint8_t opcode) { 430 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 431 432 request[0] = opcode; 433 uint16_t i; 434 uint16_t offset = 1; 435 for (i=0;i<num_value_handles;i++){ 436 little_endian_store_16(request, offset, value_handles[i]); 437 offset += 2; 438 } 439 440 return gatt_client_send(gatt_client, offset); 441 } 442 443 static uint8_t 444 att_read_multiple_request(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles) { 445 return att_read_multiple_request_with_opcode(gatt_client, num_value_handles, value_handles, ATT_READ_MULTIPLE_REQUEST); 446 } 447 448 #ifdef ENABLE_GATT_OVER_EATT 449 static uint8_t 450 att_read_multiple_variable_request(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles) { 451 return att_read_multiple_request_with_opcode(gatt_client, num_value_handles, value_handles, ATT_READ_MULTIPLE_VARIABLE_REQ); 452 } 453 #endif 454 455 #ifdef ENABLE_LE_SIGNED_WRITE 456 // precondition: can_send_packet_now == TRUE 457 static uint8_t att_signed_write_request(gatt_client_t *gatt_client, uint16_t request_type, uint16_t attribute_handle, 458 uint16_t value_length, uint8_t *value, uint32_t sign_counter, uint8_t sgn[8]) { 459 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 460 461 request[0] = request_type; 462 little_endian_store_16(request, 1, attribute_handle); 463 (void)memcpy(&request[3], value, value_length); 464 little_endian_store_32(request, 3 + value_length, sign_counter); 465 reverse_64(sgn, &request[3 + value_length + 4]); 466 467 return gatt_client_send(gatt_client, 3 + value_length + 12); 468 } 469 #endif 470 471 // precondition: can_send_packet_now == TRUE 472 static uint8_t 473 att_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, uint16_t value_length, 474 uint8_t *value) { 475 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 476 477 request[0] = request_type; 478 little_endian_store_16(request, 1, attribute_handle); 479 (void)memcpy(&request[3], value, value_length); 480 481 return gatt_client_send(gatt_client, 3u + value_length); 482 } 483 484 // precondition: can_send_packet_now == TRUE 485 static uint8_t att_execute_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint8_t execute_write) { 486 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 487 488 request[0] = request_type; 489 request[1] = execute_write; 490 491 return gatt_client_send(gatt_client, 2); 492 } 493 494 // precondition: can_send_packet_now == TRUE 495 static uint8_t att_prepare_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, 496 uint16_t value_offset, uint16_t blob_length, uint8_t *value) { 497 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 498 499 request[0] = request_type; 500 little_endian_store_16(request, 1, attribute_handle); 501 little_endian_store_16(request, 3, value_offset); 502 (void)memcpy(&request[5], &value[value_offset], blob_length); 503 504 return gatt_client_send(gatt_client, 5u + blob_length); 505 } 506 507 static uint8_t att_exchange_mtu_request(gatt_client_t *gatt_client) { 508 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 509 510 request[0] = ATT_EXCHANGE_MTU_REQUEST; 511 uint16_t mtu = l2cap_max_le_mtu(); 512 little_endian_store_16(request, 1, mtu); 513 514 return gatt_client_send(gatt_client, 3); 515 } 516 517 static uint16_t write_blob_length(gatt_client_t * gatt_client){ 518 uint16_t max_blob_length = gatt_client->mtu - 5u; 519 if (gatt_client->attribute_offset >= gatt_client->attribute_length) { 520 return 0; 521 } 522 uint16_t rest_length = gatt_client->attribute_length - gatt_client->attribute_offset; 523 if (max_blob_length > rest_length){ 524 return rest_length; 525 } 526 return max_blob_length; 527 } 528 529 static void send_gatt_services_request(gatt_client_t *gatt_client){ 530 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_GROUP_TYPE_REQUEST, 531 gatt_client->uuid16, gatt_client->start_group_handle, 532 gatt_client->end_group_handle); 533 } 534 535 static void send_gatt_by_uuid_request(gatt_client_t *gatt_client, uint16_t attribute_group_type){ 536 if (gatt_client->uuid16 != 0u){ 537 uint8_t uuid16[2]; 538 little_endian_store_16(uuid16, 0, gatt_client->uuid16); 539 att_find_by_type_value_request(gatt_client, ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, 540 gatt_client->start_group_handle, gatt_client->end_group_handle, uuid16, 2); 541 return; 542 } 543 uint8_t uuid128[16]; 544 reverse_128(gatt_client->uuid128, uuid128); 545 att_find_by_type_value_request(gatt_client, ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, 546 gatt_client->start_group_handle, gatt_client->end_group_handle, uuid128, 16); 547 } 548 549 static void send_gatt_services_by_uuid_request(gatt_client_t *gatt_client){ 550 send_gatt_by_uuid_request(gatt_client, GATT_PRIMARY_SERVICE_UUID); 551 } 552 553 static void send_gatt_included_service_uuid_request(gatt_client_t *gatt_client){ 554 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->query_start_handle); 555 } 556 557 static void send_gatt_included_service_request(gatt_client_t *gatt_client){ 558 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 559 GATT_INCLUDE_SERVICE_UUID, gatt_client->start_group_handle, 560 gatt_client->end_group_handle); 561 } 562 563 static void send_gatt_characteristic_request(gatt_client_t *gatt_client){ 564 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 565 GATT_CHARACTERISTICS_UUID, gatt_client->start_group_handle, 566 gatt_client->end_group_handle); 567 } 568 569 static void send_gatt_characteristic_descriptor_request(gatt_client_t *gatt_client){ 570 att_find_information_request(gatt_client, ATT_FIND_INFORMATION_REQUEST, gatt_client->start_group_handle, 571 gatt_client->end_group_handle); 572 } 573 574 static void send_gatt_read_characteristic_value_request(gatt_client_t *gatt_client){ 575 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 576 } 577 578 static void send_gatt_read_by_type_request(gatt_client_t * gatt_client){ 579 if (gatt_client->uuid16 != 0u){ 580 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 581 gatt_client->uuid16, gatt_client->start_group_handle, 582 gatt_client->end_group_handle); 583 } else { 584 att_read_by_type_or_group_request_for_uuid128(gatt_client, ATT_READ_BY_TYPE_REQUEST, 585 gatt_client->uuid128, gatt_client->start_group_handle, 586 gatt_client->end_group_handle); 587 } 588 } 589 590 static void send_gatt_read_blob_request(gatt_client_t *gatt_client){ 591 if (gatt_client->attribute_offset == 0){ 592 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 593 } else { 594 att_read_blob_request(gatt_client, ATT_READ_BLOB_REQUEST, gatt_client->attribute_handle, 595 gatt_client->attribute_offset); 596 } 597 } 598 599 static void send_gatt_read_multiple_request(gatt_client_t * gatt_client){ 600 att_read_multiple_request(gatt_client, gatt_client->read_multiple_handle_count, gatt_client->read_multiple_handles); 601 } 602 603 #ifdef ENABLE_GATT_OVER_EATT 604 static void send_gatt_read_multiple_variable_request(gatt_client_t * gatt_client){ 605 att_read_multiple_variable_request(gatt_client, gatt_client->read_multiple_handle_count, gatt_client->read_multiple_handles); 606 } 607 #endif 608 609 static void send_gatt_write_attribute_value_request(gatt_client_t * gatt_client){ 610 att_write_request(gatt_client, ATT_WRITE_REQUEST, gatt_client->attribute_handle, gatt_client->attribute_length, 611 gatt_client->attribute_value); 612 } 613 614 static void send_gatt_write_client_characteristic_configuration_request(gatt_client_t * gatt_client){ 615 att_write_request(gatt_client, ATT_WRITE_REQUEST, gatt_client->client_characteristic_configuration_handle, 2, 616 gatt_client->client_characteristic_configuration_value); 617 } 618 619 static void send_gatt_prepare_write_request(gatt_client_t * gatt_client){ 620 att_prepare_write_request(gatt_client, ATT_PREPARE_WRITE_REQUEST, gatt_client->attribute_handle, 621 gatt_client->attribute_offset, write_blob_length(gatt_client), 622 gatt_client->attribute_value); 623 } 624 625 static void send_gatt_execute_write_request(gatt_client_t * gatt_client){ 626 att_execute_write_request(gatt_client, ATT_EXECUTE_WRITE_REQUEST, 1); 627 } 628 629 static void send_gatt_cancel_prepared_write_request(gatt_client_t * gatt_client){ 630 att_execute_write_request(gatt_client, ATT_EXECUTE_WRITE_REQUEST, 0); 631 } 632 633 #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 634 static void send_gatt_read_client_characteristic_configuration_request(gatt_client_t * gatt_client){ 635 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 636 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION, 637 gatt_client->start_group_handle, gatt_client->end_group_handle); 638 } 639 #endif 640 641 static void send_gatt_read_characteristic_descriptor_request(gatt_client_t * gatt_client){ 642 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 643 } 644 645 #ifdef ENABLE_LE_SIGNED_WRITE 646 static void send_gatt_signed_write_request(gatt_client_t * gatt_client, uint32_t sign_counter){ 647 att_signed_write_request(gatt_client, ATT_SIGNED_WRITE_COMMAND, gatt_client->attribute_handle, 648 gatt_client->attribute_length, gatt_client->attribute_value, sign_counter, 649 gatt_client->cmac); 650 } 651 #endif 652 653 static uint16_t get_last_result_handle_from_service_list(uint8_t * packet, uint16_t size){ 654 if (size < 2) return 0xffff; 655 uint8_t attr_length = packet[1]; 656 if ((2 + attr_length) > size) return 0xffff; 657 return little_endian_read_16(packet, size - attr_length + 2u); 658 } 659 660 static uint16_t get_last_result_handle_from_characteristics_list(uint8_t * packet, uint16_t size){ 661 if (size < 2) return 0xffff; 662 uint8_t attr_length = packet[1]; 663 if ((2 + attr_length) > size) return 0xffff; 664 return little_endian_read_16(packet, size - attr_length + 3u); 665 } 666 667 static uint16_t get_last_result_handle_from_included_services_list(uint8_t * packet, uint16_t size){ 668 if (size < 2) return 0xffff; 669 uint8_t attr_length = packet[1]; 670 if ((2 + attr_length) > size) return 0xffff; 671 return little_endian_read_16(packet, size - attr_length); 672 } 673 674 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 675 static void gatt_client_service_emit_event(gatt_client_t * gatt_client, uint8_t * event, uint16_t size){ 676 btstack_linked_list_iterator_t it; 677 btstack_linked_list_iterator_init(&it, &gatt_client_service_changed_handler); 678 while (btstack_linked_list_iterator_has_next(&it)) { 679 btstack_packet_callback_registration_t *callback = (btstack_packet_callback_registration_t *) btstack_linked_list_iterator_next(&it); 680 (*callback->callback)(HCI_EVENT_PACKET, (uint16_t) gatt_client->con_handle, event, size); 681 } 682 } 683 684 static void 685 gatt_client_service_emit_database_hash(gatt_client_t *gatt_client, const uint8_t *value, uint16_t value_len) { 686 if (value_len == 16){ 687 uint8_t event[21]; 688 hci_event_builder_context_t context; 689 hci_event_builder_init(&context, event, sizeof(event), HCI_EVENT_GATTSERVICE_META, GATTSERVICE_SUBEVENT_GATT_DATABASE_HASH); 690 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 691 hci_event_builder_add_bytes(&context, value, 16); 692 gatt_client_service_emit_event(gatt_client, event, hci_event_builder_get_length(&context)); 693 } 694 } 695 696 static void 697 gatt_client_service_emit_service_changed(gatt_client_t *gatt_client, const uint8_t *value, uint16_t value_len) { 698 if (value_len == 4){ 699 uint8_t event[9]; 700 hci_event_builder_context_t context; 701 hci_event_builder_init(&context, event, sizeof(event), HCI_EVENT_GATTSERVICE_META, GATTSERVICE_SUBEVENT_GATT_SERVICE_CHANGED); 702 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 703 hci_event_builder_add_bytes(&context, value, 4); 704 gatt_client_service_emit_event(gatt_client, event, hci_event_builder_get_length(&context)); 705 } 706 } 707 708 static void gatt_client_service_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 709 UNUSED(channel); // ok: handling own l2cap events 710 UNUSED(size); // ok: there is no channel 711 712 hci_con_handle_t con_handle; 713 gatt_client_t *gatt_client; 714 gatt_client_service_t service; 715 gatt_client_characteristic_t characteristic; 716 switch (packet_type) { 717 case HCI_EVENT_PACKET: 718 switch (hci_event_packet_get_type(packet)) { 719 case GATT_EVENT_SERVICE_QUERY_RESULT: 720 con_handle = gatt_event_service_query_result_get_handle(packet); 721 gatt_client = gatt_client_get_context_for_handle(con_handle); 722 btstack_assert(gatt_client != NULL); 723 btstack_assert(gatt_client->gatt_service_state == GATT_CLIENT_SERVICE_DISCOVER_W4_DONE); 724 gatt_event_service_query_result_get_service(packet, &service); 725 gatt_client->gatt_service_start_group_handle = service.start_group_handle; 726 gatt_client->gatt_service_end_group_handle = service.end_group_handle; 727 break; 728 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 729 con_handle = gatt_event_characteristic_query_result_get_handle(packet); 730 gatt_client = gatt_client_get_context_for_handle(con_handle); 731 btstack_assert(gatt_client != NULL); 732 btstack_assert(gatt_client->gatt_service_state == GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W4_DONE); 733 gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic); 734 switch (characteristic.uuid16){ 735 case ORG_BLUETOOTH_CHARACTERISTIC_GATT_SERVICE_CHANGED: 736 gatt_client->gatt_service_changed_value_handle = characteristic.value_handle; 737 gatt_client->gatt_service_changed_end_handle = characteristic.end_handle; 738 break; 739 case ORG_BLUETOOTH_CHARACTERISTIC_DATABASE_HASH: 740 gatt_client->gatt_service_database_hash_value_handle = characteristic.value_handle; 741 gatt_client->gatt_service_database_hash_end_handle = characteristic.end_handle; 742 break; 743 default: 744 break; 745 } 746 break; 747 case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: 748 con_handle = gatt_event_characteristic_value_query_result_get_handle(packet); 749 gatt_client = gatt_client_get_context_for_handle(con_handle); 750 btstack_assert(gatt_client != NULL); 751 btstack_assert(gatt_client->gatt_service_state == GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W4_DONE); 752 gatt_client_service_emit_database_hash(gatt_client, 753 gatt_event_characteristic_value_query_result_get_value(packet), 754 gatt_event_characteristic_value_query_result_get_value_length(packet)); 755 break; 756 case GATT_EVENT_QUERY_COMPLETE: 757 con_handle = gatt_event_query_complete_get_handle(packet); 758 gatt_client = gatt_client_get_context_for_handle(con_handle); 759 btstack_assert(gatt_client != NULL); 760 switch (gatt_client->gatt_service_state) { 761 case GATT_CLIENT_SERVICE_DISCOVER_W4_DONE: 762 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W2_SEND; 763 break; 764 case GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W4_DONE: 765 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W2_SEND; 766 break; 767 case GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W4_DONE: 768 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W2_SEND; 769 break; 770 case GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W4_DONE: 771 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W2_SEND; 772 break; 773 case GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W4_DONE: 774 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DONE; 775 break; 776 default: 777 btstack_unreachable(); 778 break; 779 } 780 break; 781 default: 782 break; 783 } 784 break; 785 default: 786 break; 787 } 788 } 789 #endif 790 791 static void gatt_client_notify_can_send_query(gatt_client_t * gatt_client){ 792 793 #ifdef ENABLE_GATT_OVER_EATT 794 // if eatt is ready, notify all clients that can send a query 795 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY){ 796 btstack_linked_list_iterator_t it; 797 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 798 while (btstack_linked_list_iterator_has_next(&it)){ 799 gatt_client_t * client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 800 if (client->state == P_READY){ 801 // call callback 802 btstack_context_callback_registration_t * callback = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->query_requests); 803 if (callback == NULL) { 804 return; 805 } 806 (*callback->callback)(callback->context); 807 } 808 } 809 return; 810 } 811 #endif 812 813 while (gatt_client->state == P_READY){ 814 bool query_sent = false; 815 UNUSED(query_sent); 816 817 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 818 uint8_t status = ERROR_CODE_SUCCESS; 819 gatt_client_service_t gatt_service; 820 gatt_client_characteristic_t characteristic; 821 switch (gatt_client->gatt_service_state){ 822 case GATT_CLIENT_SERVICE_DISCOVER_W2_SEND: 823 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_W4_DONE; 824 status = gatt_client_discover_primary_services_by_uuid16(&gatt_client_service_packet_handler, 825 gatt_client->con_handle, 826 ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 827 query_sent = true; 828 break; 829 case GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W2_SEND: 830 if (gatt_client->gatt_service_start_group_handle != 0){ 831 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W4_DONE; 832 gatt_service.start_group_handle = gatt_client->gatt_service_start_group_handle; 833 gatt_service.end_group_handle = gatt_client->gatt_service_end_group_handle; 834 status = gatt_client_discover_characteristics_for_service(&gatt_client_service_packet_handler, gatt_client->con_handle, &gatt_service); 835 query_sent = true; 836 break; 837 } 838 839 /* fall through */ 840 841 case GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W2_SEND: 842 if (gatt_client->gatt_service_changed_value_handle != 0){ 843 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W4_DONE; 844 characteristic.value_handle = gatt_client->gatt_service_changed_value_handle; 845 characteristic.end_handle = gatt_client->gatt_service_changed_end_handle; 846 // we assume good case. We cannot do much otherwise 847 characteristic.properties = ATT_PROPERTY_INDICATE; 848 status = gatt_client_write_client_characteristic_configuration(&gatt_client_service_packet_handler, 849 gatt_client->con_handle, &characteristic, 850 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION); 851 query_sent = true; 852 break; 853 } 854 855 /* fall through */ 856 857 case GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W2_SEND: 858 if (gatt_client->gatt_service_database_hash_value_handle != 0){ 859 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W4_DONE; 860 status = gatt_client_read_value_of_characteristics_by_uuid16(&gatt_client_service_packet_handler, 861 gatt_client->con_handle, 862 0x0001, 0xffff, ORG_BLUETOOTH_CHARACTERISTIC_DATABASE_HASH); 863 query_sent = true; 864 break; 865 } 866 867 /* fall through */ 868 869 case GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W2_SEND: 870 if (gatt_client->gatt_service_database_hash_value_handle != 0) { 871 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W4_DONE; 872 characteristic.value_handle = gatt_client->gatt_service_database_hash_value_handle; 873 characteristic.end_handle = gatt_client->gatt_service_database_hash_end_handle; 874 // we assume good case. We cannot do much otherwise 875 characteristic.properties = ATT_PROPERTY_INDICATE; 876 status = gatt_client_write_client_characteristic_configuration(&gatt_client_service_packet_handler, 877 gatt_client->con_handle, 878 &characteristic, 879 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION); 880 query_sent = true; 881 break; 882 } 883 884 // DONE 885 gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DONE; 886 break; 887 default: 888 break; 889 } 890 btstack_assert(status == ERROR_CODE_SUCCESS); 891 UNUSED(status); 892 if (query_sent){ 893 continue; 894 } 895 #endif 896 897 #ifdef ENABLE_GATT_OVER_EATT 898 query_sent = gatt_client_le_enhanced_handle_can_send_query(gatt_client); 899 if (query_sent){ 900 continue; 901 } 902 #endif 903 btstack_context_callback_registration_t * callback = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->query_requests); 904 if (callback == NULL) { 905 return; 906 } 907 (*callback->callback)(callback->context); 908 } 909 } 910 911 // test if notification/indication should be delivered to application (BLESA) 912 static bool gatt_client_accept_server_message(gatt_client_t *gatt_client) { 913 // ignore messages until re-encryption is complete 914 if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return false; 915 916 // after that ignore if bonded but not encrypted 917 return !gap_bonded(gatt_client->con_handle) || (gap_encryption_key_size(gatt_client->con_handle) > 0); 918 } 919 920 static void emit_event_new(btstack_packet_handler_t callback, uint8_t * packet, uint16_t size){ 921 if (!callback) return; 922 hci_dump_btstack_event(packet, size); 923 (*callback)(HCI_EVENT_PACKET, 0, packet, size); 924 } 925 926 static void emit_event_to_registered_listeners(hci_con_handle_t con_handle, uint16_t attribute_handle, uint8_t * packet, uint16_t size){ 927 btstack_linked_list_iterator_t it; 928 btstack_linked_list_iterator_init(&it, &gatt_client_value_listeners); 929 while (btstack_linked_list_iterator_has_next(&it)){ 930 gatt_client_notification_t * notification = (gatt_client_notification_t*) btstack_linked_list_iterator_next(&it); 931 if ((notification->con_handle != GATT_CLIENT_ANY_CONNECTION) && (notification->con_handle != con_handle)) continue; 932 if ((notification->attribute_handle != GATT_CLIENT_ANY_VALUE_HANDLE) && (notification->attribute_handle != attribute_handle)) continue; 933 (*notification->callback)(HCI_EVENT_PACKET, 0, packet, size); 934 } 935 } 936 937 static void emit_gatt_complete_event(gatt_client_t * gatt_client, uint8_t att_status){ 938 // @format H122 939 uint8_t packet[9]; 940 hci_event_builder_context_t context; 941 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_QUERY_COMPLETE, 0); 942 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 943 hci_event_builder_add_16(&context, gatt_client->service_id); 944 hci_event_builder_add_16(&context, gatt_client->connection_id); 945 hci_event_builder_add_08(&context, att_status); 946 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 947 } 948 949 static void emit_gatt_service_query_result_event(gatt_client_t * gatt_client, uint16_t start_group_handle, uint16_t end_group_handle, const uint8_t * uuid128){ 950 // @format H22X 951 uint8_t packet[28]; 952 hci_event_builder_context_t context; 953 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_SERVICE_QUERY_RESULT, 0); 954 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 955 hci_event_builder_add_16(&context, gatt_client->service_id); 956 hci_event_builder_add_16(&context, gatt_client->connection_id); 957 hci_event_builder_add_16(&context, start_group_handle); 958 hci_event_builder_add_16(&context, end_group_handle); 959 hci_event_builder_add_128(&context, uuid128); 960 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 961 } 962 963 static void emit_gatt_included_service_query_result_event(gatt_client_t * gatt_client, uint16_t include_handle, uint16_t start_group_handle, uint16_t end_group_handle, const uint8_t * uuid128){ 964 // @format H22X 965 uint8_t packet[30]; 966 hci_event_builder_context_t context; 967 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_INCLUDED_SERVICE_QUERY_RESULT, 0); 968 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 969 hci_event_builder_add_16(&context, gatt_client->service_id); 970 hci_event_builder_add_16(&context, gatt_client->connection_id); 971 hci_event_builder_add_16(&context, include_handle); 972 hci_event_builder_add_16(&context, start_group_handle); 973 hci_event_builder_add_16(&context, end_group_handle); 974 hci_event_builder_add_128(&context, uuid128); 975 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 976 } 977 978 static void emit_gatt_characteristic_query_result_event(gatt_client_t * gatt_client, uint16_t start_handle, uint16_t value_handle, uint16_t end_handle, 979 uint16_t properties, const uint8_t * uuid128){ 980 // @format H22Y 981 uint8_t packet[32]; 982 hci_event_builder_context_t context; 983 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_CHARACTERISTIC_QUERY_RESULT, 0); 984 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 985 hci_event_builder_add_16(&context, gatt_client->service_id); 986 hci_event_builder_add_16(&context, gatt_client->connection_id); 987 hci_event_builder_add_16(&context, start_handle); 988 hci_event_builder_add_16(&context, value_handle); 989 hci_event_builder_add_16(&context, end_handle); 990 hci_event_builder_add_16(&context, properties); 991 hci_event_builder_add_128(&context, uuid128); 992 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 993 } 994 995 static void emit_gatt_all_characteristic_descriptors_result_event( 996 gatt_client_t * gatt_client, uint16_t descriptor_handle, const uint8_t * uuid128){ 997 // @format H22Z 998 uint8_t packet[26]; 999 hci_event_builder_context_t context; 1000 hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT, 0); 1001 hci_event_builder_add_con_handle(&context, gatt_client->con_handle); 1002 hci_event_builder_add_16(&context, gatt_client->service_id); 1003 hci_event_builder_add_16(&context, gatt_client->connection_id); 1004 hci_event_builder_add_16(&context, descriptor_handle); 1005 hci_event_builder_add_128(&context, uuid128); 1006 emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); 1007 } 1008 1009 static void emit_gatt_mtu_exchanged_result_event(gatt_client_t * gatt_client, uint16_t new_mtu){ 1010 // @format H2 1011 uint8_t packet[6]; 1012 packet[0] = GATT_EVENT_MTU; 1013 packet[1] = sizeof(packet) - 2u; 1014 little_endian_store_16(packet, 2, gatt_client->con_handle); 1015 little_endian_store_16(packet, 4, new_mtu); 1016 att_dispatch_client_mtu_exchanged(gatt_client->con_handle, new_mtu); 1017 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 1018 } 1019 1020 // helper 1021 static void gatt_client_handle_transaction_complete(gatt_client_t *gatt_client, uint8_t att_status) { 1022 gatt_client->state = P_READY; 1023 gatt_client_timeout_stop(gatt_client); 1024 emit_gatt_complete_event(gatt_client, att_status); 1025 gatt_client_notify_can_send_query(gatt_client); 1026 } 1027 1028 // @return packet pointer 1029 // @note assume that value is part of an l2cap buffer - overwrite HCI + L2CAP packet headers 1030 #define CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 8 1031 static uint8_t * 1032 setup_characteristic_value_packet(const gatt_client_t *gatt_client, uint8_t type, uint16_t attribute_handle, 1033 uint8_t *value, uint16_t length) { 1034 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 1035 // copy value into test packet for testing 1036 static uint8_t packet[1000]; 1037 memcpy(&packet[CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE], value, length); 1038 #else 1039 // before the value inside the ATT PDU 1040 uint8_t * packet = value - CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE; 1041 #endif 1042 packet[0] = type; 1043 packet[1] = CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 2 + length; 1044 little_endian_store_16(packet, 2, gatt_client->con_handle); 1045 little_endian_store_16(packet, 4, attribute_handle); 1046 little_endian_store_16(packet, 6, length); 1047 return packet; 1048 } 1049 1050 // @return packet pointer 1051 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1052 #define LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 10 1053 1054 // L2CAP Header (4) + ACL Header (4) => 8 bytes 1055 #if !defined(HCI_INCOMING_PRE_BUFFER_SIZE) || ((HCI_INCOMING_PRE_BUFFER_SIZE < LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 8)) 1056 #error "Long Characteristic reads requires HCI_INCOMING_PRE_BUFFER_SIZE >= 2" 1057 #endif 1058 1059 static uint8_t * 1060 setup_long_characteristic_value_packet(const gatt_client_t *gatt_client, uint8_t type, uint16_t attribute_handle, 1061 uint16_t offset, uint8_t *value, uint16_t length) { 1062 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 1063 // avoid using pre ATT headers. 1064 // copy value into test packet for testing 1065 static uint8_t packet[1000]; 1066 memcpy(&packet[LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE], value, length); 1067 #else 1068 // before the value inside the ATT PDU 1069 uint8_t * packet = value - LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE; 1070 #endif 1071 packet[0] = type; 1072 packet[1] = LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 2 + length; 1073 little_endian_store_16(packet, 2, gatt_client->con_handle); 1074 little_endian_store_16(packet, 4, attribute_handle); 1075 little_endian_store_16(packet, 6, offset); 1076 little_endian_store_16(packet, 8, length); 1077 return packet; 1078 } 1079 1080 #if (LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE > CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE) 1081 #define REPORT_PREBUFFER_HEADER LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 1082 #else 1083 #define REPORT_PREBUFFER_HEADER CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 1084 #endif 1085 1086 /// 1087 static void report_gatt_services(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 1088 if (size < 2) return; 1089 uint8_t attr_length = packet[1]; 1090 uint8_t uuid_length = attr_length - 4u; 1091 1092 int i; 1093 for (i = 2; (i+attr_length) <= size; i += attr_length){ 1094 uint16_t start_group_handle = little_endian_read_16(packet,i); 1095 uint16_t end_group_handle = little_endian_read_16(packet,i+2); 1096 uint8_t uuid128[16]; 1097 uint16_t uuid16 = 0; 1098 1099 if (uuid_length == 2u){ 1100 uuid16 = little_endian_read_16(packet, i+4); 1101 uuid_add_bluetooth_prefix((uint8_t*) &uuid128, uuid16); 1102 } else if (uuid_length == 16u) { 1103 reverse_128(&packet[i+4], uuid128); 1104 } else { 1105 return; 1106 } 1107 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, uuid128); 1108 } 1109 } 1110 1111 static void report_gatt_characteristic_start_found(gatt_client_t * gatt_client, uint16_t start_handle, uint8_t properties, uint16_t value_handle, uint8_t * uuid, uint16_t uuid_length){ 1112 uint8_t uuid128[16]; 1113 uint16_t uuid16 = 0; 1114 if (uuid_length == 2u){ 1115 uuid16 = little_endian_read_16(uuid, 0); 1116 uuid_add_bluetooth_prefix((uint8_t*) uuid128, uuid16); 1117 } else if (uuid_length == 16u){ 1118 reverse_128(uuid, uuid128); 1119 } else { 1120 return; 1121 } 1122 1123 if (gatt_client->filter_with_uuid && (memcmp(gatt_client->uuid128, uuid128, 16) != 0)) return; 1124 1125 gatt_client->characteristic_properties = properties; 1126 gatt_client->characteristic_start_handle = start_handle; 1127 gatt_client->attribute_handle = value_handle; 1128 1129 if (gatt_client->filter_with_uuid) return; 1130 1131 gatt_client->uuid16 = uuid16; 1132 (void)memcpy(gatt_client->uuid128, uuid128, 16); 1133 } 1134 1135 static void report_gatt_characteristic_end_found(gatt_client_t * gatt_client, uint16_t end_handle){ 1136 // TODO: stop searching if filter and uuid found 1137 1138 if (!gatt_client->characteristic_start_handle) return; 1139 1140 emit_gatt_characteristic_query_result_event(gatt_client, gatt_client->characteristic_start_handle, gatt_client->attribute_handle, 1141 end_handle, gatt_client->characteristic_properties, gatt_client->uuid128); 1142 1143 gatt_client->characteristic_start_handle = 0; 1144 } 1145 1146 1147 static void report_gatt_characteristics(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 1148 if (size < 2u) return; 1149 uint8_t attr_length = packet[1]; 1150 if ((attr_length != 7u) && (attr_length != 21u)) return; 1151 uint8_t uuid_length = attr_length - 5u; 1152 int i; 1153 for (i = 2u; (i + attr_length) <= size; i += attr_length){ 1154 uint16_t start_handle = little_endian_read_16(packet, i); 1155 uint8_t properties = packet[i+2]; 1156 uint16_t value_handle = little_endian_read_16(packet, i+3); 1157 report_gatt_characteristic_end_found(gatt_client, start_handle - 1u); 1158 report_gatt_characteristic_start_found(gatt_client, start_handle, properties, value_handle, &packet[i + 5], 1159 uuid_length); 1160 } 1161 } 1162 1163 static void report_gatt_included_service_uuid16(gatt_client_t * gatt_client, uint16_t include_handle, uint16_t uuid16){ 1164 uint8_t normalized_uuid128[16]; 1165 uuid_add_bluetooth_prefix(normalized_uuid128, uuid16); 1166 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 1167 gatt_client->query_end_handle, normalized_uuid128); 1168 } 1169 1170 static void report_gatt_included_service_uuid128(gatt_client_t * gatt_client, uint16_t include_handle, const uint8_t * uuid128){ 1171 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 1172 gatt_client->query_end_handle, uuid128); 1173 } 1174 1175 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1176 static void report_gatt_notification(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { 1177 if (!gatt_client_accept_server_message(gatt_client)) return; 1178 uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_NOTIFICATION, value_handle, 1179 value, length); 1180 emit_event_to_registered_listeners(gatt_client->con_handle, value_handle, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 1181 } 1182 1183 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1184 static void report_gatt_indication(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { 1185 if (!gatt_client_accept_server_message(gatt_client)) return; 1186 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 1187 // Directly Handle GATT Service Changed and Database Hash indications 1188 if (value_handle == gatt_client->gatt_service_database_hash_value_handle){ 1189 gatt_client_service_emit_database_hash(gatt_client, value, length); 1190 } 1191 if (value_handle == gatt_client->gatt_service_changed_value_handle){ 1192 gatt_client_service_emit_service_changed(gatt_client, value, length); 1193 } 1194 #endif 1195 uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_INDICATION, value_handle, 1196 value, length); 1197 emit_event_to_registered_listeners(gatt_client->con_handle, value_handle, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 1198 } 1199 1200 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1201 static void report_gatt_characteristic_value(gatt_client_t * gatt_client, uint16_t attribute_handle, uint8_t * value, uint16_t length){ 1202 uint8_t * packet = setup_characteristic_value_packet( 1203 gatt_client, GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT, attribute_handle, value, length); 1204 emit_event_new(gatt_client->callback, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 1205 } 1206 1207 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 1208 static void report_gatt_long_characteristic_value_blob(gatt_client_t * gatt_client, uint16_t attribute_handle, uint8_t * blob, uint16_t blob_length, int value_offset){ 1209 uint8_t * packet = setup_long_characteristic_value_packet(gatt_client, 1210 GATT_EVENT_LONG_CHARACTERISTIC_VALUE_QUERY_RESULT, 1211 attribute_handle, value_offset, 1212 blob, blob_length); 1213 emit_event_new(gatt_client->callback, packet, blob_length + LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE); 1214 } 1215 1216 static void report_gatt_characteristic_descriptor(gatt_client_t * gatt_client, uint16_t descriptor_handle, uint8_t *value, uint16_t value_length, uint16_t value_offset){ 1217 UNUSED(value_offset); 1218 uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, 1219 descriptor_handle, value, 1220 value_length); 1221 emit_event_new(gatt_client->callback, packet, value_length + 8u); 1222 } 1223 1224 static void report_gatt_long_characteristic_descriptor(gatt_client_t * gatt_client, uint16_t descriptor_handle, uint8_t *blob, uint16_t blob_length, uint16_t value_offset){ 1225 uint8_t * packet = setup_long_characteristic_value_packet(gatt_client, 1226 GATT_EVENT_LONG_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, 1227 descriptor_handle, value_offset, 1228 blob, blob_length); 1229 emit_event_new(gatt_client->callback, packet, blob_length + LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE); 1230 } 1231 1232 static void report_gatt_all_characteristic_descriptors(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size, uint16_t pair_size){ 1233 int i; 1234 for (i = 0u; (i + pair_size) <= size; i += pair_size){ 1235 uint16_t descriptor_handle = little_endian_read_16(packet,i); 1236 uint8_t uuid128[16]; 1237 uint16_t uuid16 = 0; 1238 if (pair_size == 4u){ 1239 uuid16 = little_endian_read_16(packet,i+2); 1240 uuid_add_bluetooth_prefix(uuid128, uuid16); 1241 } else { 1242 reverse_128(&packet[i+2], uuid128); 1243 } 1244 emit_gatt_all_characteristic_descriptors_result_event(gatt_client, descriptor_handle, uuid128); 1245 } 1246 1247 } 1248 1249 static bool is_query_done(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1250 return last_result_handle >= gatt_client->end_group_handle; 1251 } 1252 1253 static void trigger_next_query(gatt_client_t * gatt_client, uint16_t last_result_handle, gatt_client_state_t next_query_state){ 1254 if (is_query_done(gatt_client, last_result_handle)){ 1255 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1256 return; 1257 } 1258 // next 1259 gatt_client->start_group_handle = last_result_handle + 1u; 1260 gatt_client->state = next_query_state; 1261 } 1262 1263 static void trigger_next_included_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1264 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_INCLUDED_SERVICE_QUERY); 1265 } 1266 1267 static void trigger_next_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1268 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_QUERY); 1269 } 1270 1271 static void trigger_next_service_by_uuid_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1272 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_WITH_UUID_QUERY); 1273 } 1274 1275 static void trigger_next_characteristic_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1276 if (is_query_done(gatt_client, last_result_handle)){ 1277 // report last characteristic 1278 report_gatt_characteristic_end_found(gatt_client, gatt_client->end_group_handle); 1279 } 1280 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY); 1281 } 1282 1283 static void trigger_next_characteristic_descriptor_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1284 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY); 1285 } 1286 1287 static void trigger_next_read_by_type_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1288 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_READ_BY_TYPE_REQUEST); 1289 } 1290 1291 static void trigger_next_prepare_write_query(gatt_client_t * gatt_client, gatt_client_state_t next_query_state, gatt_client_state_t done_state){ 1292 gatt_client->attribute_offset += write_blob_length(gatt_client); 1293 uint16_t next_blob_length = write_blob_length(gatt_client); 1294 1295 if (next_blob_length == 0u){ 1296 gatt_client->state = done_state; 1297 return; 1298 } 1299 gatt_client->state = next_query_state; 1300 } 1301 1302 static void trigger_next_blob_query(gatt_client_t * gatt_client, gatt_client_state_t next_query_state, uint16_t received_blob_length){ 1303 1304 uint16_t max_blob_length = gatt_client->mtu - 1u; 1305 if (received_blob_length < max_blob_length){ 1306 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1307 return; 1308 } 1309 1310 gatt_client->attribute_offset += received_blob_length; 1311 gatt_client->state = next_query_state; 1312 } 1313 1314 void gatt_client_listen_for_characteristic_value_updates(gatt_client_notification_t * notification, btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 1315 notification->callback = callback; 1316 notification->con_handle = con_handle; 1317 if (characteristic == NULL){ 1318 notification->attribute_handle = GATT_CLIENT_ANY_VALUE_HANDLE; 1319 } else { 1320 notification->attribute_handle = characteristic->value_handle; 1321 } 1322 btstack_linked_list_add(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 1323 } 1324 1325 void gatt_client_stop_listening_for_characteristic_value_updates(gatt_client_notification_t * notification){ 1326 btstack_linked_list_remove(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 1327 } 1328 1329 static bool is_value_valid(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size){ 1330 uint16_t attribute_handle = little_endian_read_16(packet, 1); 1331 uint16_t value_offset = little_endian_read_16(packet, 3); 1332 1333 if (gatt_client->attribute_handle != attribute_handle) return false; 1334 if (gatt_client->attribute_offset != value_offset) return false; 1335 return memcmp(&gatt_client->attribute_value[gatt_client->attribute_offset], &packet[5], size - 5u) == 0u; 1336 } 1337 1338 #ifdef ENABLE_LE_SIGNED_WRITE 1339 static void gatt_client_run_for_client_start_signed_write(gatt_client_t *gatt_client) { 1340 sm_key_t csrk; 1341 le_device_db_local_csrk_get(gatt_client->le_device_index, csrk); 1342 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 1343 gatt_client->state = P_W4_CMAC_RESULT; 1344 sm_cmac_signed_write_start(csrk, ATT_SIGNED_WRITE_COMMAND, gatt_client->attribute_handle, gatt_client->attribute_length, gatt_client->attribute_value, sign_counter, att_signed_write_handle_cmac_result); 1345 } 1346 #endif 1347 1348 // returns true if packet was sent 1349 static bool gatt_client_run_for_gatt_client(gatt_client_t * gatt_client){ 1350 1351 // wait until re-encryption is complete 1352 if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return false; 1353 1354 // wait until re-encryption is complete 1355 if (gatt_client->reencryption_active) return false; 1356 1357 // wait until pairing complete (either reactive authentication or due to required security level) 1358 if (gatt_client->wait_for_authentication_complete) return false; 1359 1360 bool client_request_pending = gatt_client->state != P_READY; 1361 1362 // verify security level for Mandatory Authentication over LE 1363 bool check_security; 1364 switch (gatt_client->bearer_type){ 1365 case ATT_BEARER_UNENHANCED_LE: 1366 check_security = true; 1367 break; 1368 default: 1369 check_security = false; 1370 break; 1371 } 1372 if (client_request_pending && (gatt_client_required_security_level > gatt_client->security_level) && check_security){ 1373 log_info("Trigger pairing, current security level %u, required %u\n", gatt_client->security_level, gatt_client_required_security_level); 1374 gatt_client->wait_for_authentication_complete = true; 1375 // set att error code for pairing failure based on required level 1376 switch (gatt_client_required_security_level){ 1377 case LEVEL_4: 1378 case LEVEL_3: 1379 gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_AUTHENTICATION; 1380 break; 1381 default: 1382 gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_ENCRYPTION; 1383 break; 1384 } 1385 sm_request_pairing(gatt_client->con_handle); 1386 // sm probably just sent a pdu 1387 return true; 1388 } 1389 1390 switch (gatt_client->mtu_state) { 1391 case SEND_MTU_EXCHANGE: 1392 gatt_client->mtu_state = SENT_MTU_EXCHANGE; 1393 att_exchange_mtu_request(gatt_client); 1394 return true; 1395 case SENT_MTU_EXCHANGE: 1396 return false; 1397 default: 1398 break; 1399 } 1400 1401 if (gatt_client->send_confirmation){ 1402 gatt_client->send_confirmation = false; 1403 att_confirmation(gatt_client); 1404 return true; 1405 } 1406 1407 // check MTU for writes 1408 switch (gatt_client->state){ 1409 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 1410 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 1411 if (gatt_client->attribute_length <= (gatt_client->mtu - 3u)) break; 1412 log_error("gatt_client_run: value len %u > MTU %u - 3\n", gatt_client->attribute_length,gatt_client->mtu); 1413 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH); 1414 return false; 1415 default: 1416 break; 1417 } 1418 1419 bool packet_sent = true; 1420 bool done = true; 1421 switch (gatt_client->state){ 1422 case P_W2_SEND_SERVICE_QUERY: 1423 gatt_client->state = P_W4_SERVICE_QUERY_RESULT; 1424 send_gatt_services_request(gatt_client); 1425 break; 1426 1427 case P_W2_SEND_SERVICE_WITH_UUID_QUERY: 1428 gatt_client->state = P_W4_SERVICE_WITH_UUID_RESULT; 1429 send_gatt_services_by_uuid_request(gatt_client); 1430 break; 1431 1432 case P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY: 1433 gatt_client->state = P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT; 1434 send_gatt_characteristic_request(gatt_client); 1435 break; 1436 1437 case P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY: 1438 gatt_client->state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 1439 send_gatt_characteristic_request(gatt_client); 1440 break; 1441 1442 case P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY: 1443 gatt_client->state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 1444 send_gatt_characteristic_descriptor_request(gatt_client); 1445 break; 1446 1447 case P_W2_SEND_INCLUDED_SERVICE_QUERY: 1448 gatt_client->state = P_W4_INCLUDED_SERVICE_QUERY_RESULT; 1449 send_gatt_included_service_request(gatt_client); 1450 break; 1451 1452 case P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY: 1453 gatt_client->state = P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT; 1454 send_gatt_included_service_uuid_request(gatt_client); 1455 break; 1456 1457 case P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY: 1458 gatt_client->state = P_W4_READ_CHARACTERISTIC_VALUE_RESULT; 1459 send_gatt_read_characteristic_value_request(gatt_client); 1460 break; 1461 1462 case P_W2_SEND_READ_BLOB_QUERY: 1463 gatt_client->state = P_W4_READ_BLOB_RESULT; 1464 send_gatt_read_blob_request(gatt_client); 1465 break; 1466 1467 case P_W2_SEND_READ_BY_TYPE_REQUEST: 1468 gatt_client->state = P_W4_READ_BY_TYPE_RESPONSE; 1469 send_gatt_read_by_type_request(gatt_client); 1470 break; 1471 1472 case P_W2_SEND_READ_MULTIPLE_REQUEST: 1473 gatt_client->state = P_W4_READ_MULTIPLE_RESPONSE; 1474 send_gatt_read_multiple_request(gatt_client); 1475 break; 1476 1477 #ifdef ENABLE_GATT_OVER_EATT 1478 case P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST: 1479 gatt_client->state = P_W4_READ_MULTIPLE_VARIABLE_RESPONSE; 1480 send_gatt_read_multiple_variable_request(gatt_client); 1481 break; 1482 #endif 1483 1484 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 1485 gatt_client->state = P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT; 1486 send_gatt_write_attribute_value_request(gatt_client); 1487 break; 1488 1489 case P_W2_PREPARE_WRITE: 1490 gatt_client->state = P_W4_PREPARE_WRITE_RESULT; 1491 send_gatt_prepare_write_request(gatt_client); 1492 break; 1493 1494 case P_W2_PREPARE_WRITE_SINGLE: 1495 gatt_client->state = P_W4_PREPARE_WRITE_SINGLE_RESULT; 1496 send_gatt_prepare_write_request(gatt_client); 1497 break; 1498 1499 case P_W2_PREPARE_RELIABLE_WRITE: 1500 gatt_client->state = P_W4_PREPARE_RELIABLE_WRITE_RESULT; 1501 send_gatt_prepare_write_request(gatt_client); 1502 break; 1503 1504 case P_W2_EXECUTE_PREPARED_WRITE: 1505 gatt_client->state = P_W4_EXECUTE_PREPARED_WRITE_RESULT; 1506 send_gatt_execute_write_request(gatt_client); 1507 break; 1508 1509 case P_W2_CANCEL_PREPARED_WRITE: 1510 gatt_client->state = P_W4_CANCEL_PREPARED_WRITE_RESULT; 1511 send_gatt_cancel_prepared_write_request(gatt_client); 1512 break; 1513 1514 case P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH: 1515 gatt_client->state = P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT; 1516 send_gatt_cancel_prepared_write_request(gatt_client); 1517 break; 1518 1519 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1520 case P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 1521 // use Find Information 1522 gatt_client->gatt_client_state = P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1523 send_gatt_characteristic_descriptor_request(gatt_client); 1524 #else 1525 case P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 1526 // Use Read By Type 1527 gatt_client->state = P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1528 send_gatt_read_client_characteristic_configuration_request(gatt_client); 1529 #endif 1530 break; 1531 1532 case P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY: 1533 gatt_client->state = P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT; 1534 send_gatt_read_characteristic_descriptor_request(gatt_client); 1535 break; 1536 1537 case P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY: 1538 gatt_client->state = P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT; 1539 send_gatt_read_blob_request(gatt_client); 1540 break; 1541 1542 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 1543 gatt_client->state = P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1544 send_gatt_write_attribute_value_request(gatt_client); 1545 break; 1546 1547 case P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION: 1548 gatt_client->state = P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT; 1549 send_gatt_write_client_characteristic_configuration_request(gatt_client); 1550 break; 1551 1552 case P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR: 1553 gatt_client->state = P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1554 send_gatt_prepare_write_request(gatt_client); 1555 break; 1556 1557 case P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR: 1558 gatt_client->state = P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1559 send_gatt_execute_write_request(gatt_client); 1560 break; 1561 1562 #ifdef ENABLE_LE_SIGNED_WRITE 1563 case P_W4_IDENTITY_RESOLVING: 1564 log_info("P_W4_IDENTITY_RESOLVING - state %x", sm_identity_resolving_state(gatt_client->con_handle)); 1565 switch (sm_identity_resolving_state(gatt_client->con_handle)){ 1566 case IRK_LOOKUP_SUCCEEDED: 1567 gatt_client->le_device_index = sm_le_device_index(gatt_client->con_handle); 1568 gatt_client->state = P_W4_CMAC_READY; 1569 if (sm_cmac_ready()){ 1570 gatt_client_run_for_client_start_signed_write(gatt_client); 1571 } 1572 break; 1573 case IRK_LOOKUP_FAILED: 1574 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1575 break; 1576 default: 1577 break; 1578 } 1579 packet_sent = false; 1580 break; 1581 1582 case P_W4_CMAC_READY: 1583 if (sm_cmac_ready()){ 1584 gatt_client_run_for_client_start_signed_write(gatt_client); 1585 } 1586 packet_sent = false; 1587 break; 1588 1589 case P_W2_SEND_SIGNED_WRITE: { 1590 gatt_client->state = P_W4_SEND_SIGNED_WRITE_DONE; 1591 // bump local signing counter 1592 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 1593 le_device_db_local_counter_set(gatt_client->le_device_index, sign_counter + 1); 1594 // send signed write command 1595 send_gatt_signed_write_request(gatt_client, sign_counter); 1596 // finally, notifiy client that write is complete 1597 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1598 break; 1599 } 1600 #endif 1601 default: 1602 done = false; 1603 break; 1604 } 1605 1606 if (done){ 1607 return packet_sent; 1608 } 1609 1610 // write without response callback 1611 btstack_context_callback_registration_t * callback = 1612 (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->write_without_response_requests); 1613 if (callback != NULL){ 1614 (*callback->callback)(callback->context); 1615 return true; 1616 } 1617 1618 // requested can send now old 1619 if (gatt_client->write_without_response_callback != NULL){ 1620 btstack_packet_handler_t packet_handler = gatt_client->write_without_response_callback; 1621 gatt_client->write_without_response_callback = NULL; 1622 uint8_t event[4]; 1623 event[0] = GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE; 1624 event[1] = sizeof(event) - 2u; 1625 little_endian_store_16(event, 2, gatt_client->con_handle); 1626 packet_handler(HCI_EVENT_PACKET, gatt_client->con_handle, event, sizeof(event)); 1627 return true; // to trigger requeueing (even if higher layer didn't sent) 1628 } 1629 1630 return false; 1631 } 1632 1633 static void gatt_client_run(void){ 1634 btstack_linked_item_t *it; 1635 bool packet_sent; 1636 #ifdef ENABLE_GATT_OVER_EATT 1637 btstack_linked_list_iterator_t it_eatt; 1638 #endif 1639 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 1640 gatt_client_t * gatt_client = (gatt_client_t *) it; 1641 switch (gatt_client->bearer_type){ 1642 case ATT_BEARER_UNENHANCED_LE: 1643 #ifdef ENABLE_GATT_OVER_EATT 1644 btstack_linked_list_iterator_init(&it_eatt, &gatt_client->eatt_clients); 1645 while (btstack_linked_list_iterator_has_next(&it_eatt)) { 1646 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it_eatt); 1647 if (eatt_client->state != P_READY){ 1648 if (att_dispatch_client_can_send_now(gatt_client->con_handle)){ 1649 gatt_client_run_for_gatt_client(eatt_client); 1650 } 1651 } 1652 } 1653 #endif 1654 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) { 1655 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1656 return; 1657 } 1658 packet_sent = gatt_client_run_for_gatt_client(gatt_client); 1659 if (packet_sent){ 1660 // request new permission 1661 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1662 // requeue client for fairness and exit 1663 // note: iterator has become invalid 1664 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1665 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1666 return; 1667 } 1668 break; 1669 #ifdef ENABLE_GATT_OVER_CLASSIC 1670 case ATT_BEARER_UNENHANCED_CLASSIC: 1671 if (gatt_client->con_handle == HCI_CON_HANDLE_INVALID) { 1672 continue; 1673 } 1674 1675 // handle GATT over BR/EDR 1676 if (att_dispatch_client_can_send_now(gatt_client->con_handle) == false) { 1677 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1678 return; 1679 } 1680 packet_sent = gatt_client_run_for_gatt_client(gatt_client); 1681 if (packet_sent){ 1682 // request new permission 1683 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1684 // requeue client for fairness and exit 1685 // note: iterator has become invalid 1686 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1687 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1688 return; 1689 } 1690 break; 1691 #endif 1692 default: 1693 btstack_unreachable(); 1694 break; 1695 } 1696 1697 1698 } 1699 } 1700 1701 // emit complete event, used to avoid emitting event from API call 1702 static void gatt_client_emit_events(void * context){ 1703 UNUSED(context); 1704 btstack_linked_item_t *it; 1705 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next) { 1706 gatt_client_t *gatt_client = (gatt_client_t *) it; 1707 if (gatt_client->state == P_W2_EMIT_QUERY_COMPLETE_EVENT){ 1708 gatt_client->state = P_READY; 1709 emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); 1710 } 1711 } 1712 } 1713 1714 static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code) { 1715 if (is_ready(gatt_client)) return; 1716 gatt_client_handle_transaction_complete(gatt_client, att_error_code); 1717 } 1718 1719 static void gatt_client_handle_reencryption_complete(const uint8_t * packet){ 1720 hci_con_handle_t con_handle = sm_event_reencryption_complete_get_handle(packet); 1721 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 1722 if (gatt_client == NULL) return; 1723 1724 // update security level 1725 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 1726 1727 gatt_client->reencryption_result = sm_event_reencryption_complete_get_status(packet); 1728 gatt_client->reencryption_active = false; 1729 gatt_client->wait_for_authentication_complete = false; 1730 1731 if (gatt_client->state == P_READY) return; 1732 1733 switch (sm_event_reencryption_complete_get_status(packet)){ 1734 case ERROR_CODE_SUCCESS: 1735 log_info("re-encryption success, retry operation"); 1736 break; 1737 case ERROR_CODE_AUTHENTICATION_FAILURE: 1738 case ERROR_CODE_PIN_OR_KEY_MISSING: 1739 #if defined(ENABLE_GATT_CLIENT_PAIRING) && !defined(ENABLE_LE_PROACTIVE_AUTHENTICATION) 1740 if (gatt_client_required_security_level == LEVEL_0) { 1741 // re-encryption failed for reactive authentication with pairing and we have a pending client request 1742 // => try to resolve it by deleting bonding information if we started pairing before 1743 // delete bonding information 1744 int le_device_db_index = sm_le_device_index(gatt_client->con_handle); 1745 btstack_assert(le_device_db_index >= 0); 1746 log_info("reactive auth with pairing: delete bonding and start pairing"); 1747 #ifdef ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION 1748 hci_remove_le_device_db_entry_from_resolving_list((uint16_t) le_device_db_index); 1749 #endif 1750 le_device_db_remove(le_device_db_index); 1751 // trigger pairing again 1752 sm_request_pairing(gatt_client->con_handle); 1753 break; 1754 } 1755 #endif 1756 // report bonding information missing 1757 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1758 break; 1759 default: 1760 // report bonding information missing 1761 gatt_client_handle_transaction_complete(gatt_client, gatt_client->pending_error_code); 1762 break; 1763 } 1764 } 1765 1766 static void gatt_client_handle_disconnection_complete(const uint8_t * packet){ 1767 log_info("GATT Client: HCI_EVENT_DISCONNECTION_COMPLETE"); 1768 hci_con_handle_t con_handle = little_endian_read_16(packet,3); 1769 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 1770 if (gatt_client == NULL) return; 1771 1772 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 1773 gatt_client_timeout_stop(gatt_client); 1774 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1775 btstack_memory_gatt_client_free(gatt_client); 1776 } 1777 1778 static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1779 UNUSED(channel); // ok: handling own l2cap events 1780 UNUSED(size); // ok: there is no channel 1781 1782 if (packet_type != HCI_EVENT_PACKET) return; 1783 1784 hci_con_handle_t con_handle; 1785 gatt_client_t * gatt_client; 1786 switch (hci_event_packet_get_type(packet)) { 1787 case HCI_EVENT_DISCONNECTION_COMPLETE: 1788 gatt_client_handle_disconnection_complete(packet); 1789 break; 1790 1791 // Pairing complete (with/without bonding=storing of pairing information) 1792 case SM_EVENT_PAIRING_COMPLETE: 1793 con_handle = sm_event_pairing_complete_get_handle(packet); 1794 gatt_client = gatt_client_get_context_for_handle(con_handle); 1795 if (gatt_client == NULL) break; 1796 1797 // update security level 1798 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 1799 1800 if (gatt_client->wait_for_authentication_complete){ 1801 gatt_client->wait_for_authentication_complete = false; 1802 if (sm_event_pairing_complete_get_status(packet) != ERROR_CODE_SUCCESS){ 1803 log_info("pairing failed, report previous error 0x%x", gatt_client->pending_error_code); 1804 gatt_client_report_error_if_pending(gatt_client, gatt_client->pending_error_code); 1805 } else { 1806 log_info("pairing success, retry operation"); 1807 } 1808 } 1809 break; 1810 1811 #ifdef ENABLE_LE_SIGNED_WRITE 1812 // Identity Resolving completed (no code, gatt_client_run will continue) 1813 case SM_EVENT_IDENTITY_RESOLVING_SUCCEEDED: 1814 case SM_EVENT_IDENTITY_RESOLVING_FAILED: 1815 break; 1816 #endif 1817 1818 // re-encryption started 1819 case SM_EVENT_REENCRYPTION_STARTED: 1820 con_handle = sm_event_reencryption_complete_get_handle(packet); 1821 gatt_client = gatt_client_get_context_for_handle(con_handle); 1822 if (gatt_client == NULL) break; 1823 1824 gatt_client->reencryption_active = true; 1825 gatt_client->reencryption_result = ERROR_CODE_SUCCESS; 1826 break; 1827 1828 // re-encryption complete 1829 case SM_EVENT_REENCRYPTION_COMPLETE: 1830 gatt_client_handle_reencryption_complete(packet); 1831 break; 1832 default: 1833 break; 1834 } 1835 1836 gatt_client_run(); 1837 } 1838 1839 static void gatt_client_handle_att_read_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { 1840 switch (gatt_client->state) { 1841 case P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT: 1842 if (size >= 17) { 1843 uint8_t uuid128[16]; 1844 reverse_128(&packet[1], uuid128); 1845 report_gatt_included_service_uuid128(gatt_client, gatt_client->start_group_handle, uuid128); 1846 } 1847 trigger_next_included_service_query(gatt_client, gatt_client->start_group_handle); 1848 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1849 break; 1850 1851 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 1852 report_gatt_characteristic_value(gatt_client, gatt_client->attribute_handle, &packet[1], size - 1u); 1853 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1854 break; 1855 1856 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: 1857 report_gatt_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], 1858 size - 1u, 0u); 1859 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1860 break; 1861 1862 // Use ATT_READ_REQUEST for first blob of Read Long Characteristic 1863 case P_W4_READ_BLOB_RESULT: 1864 report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], 1865 size - 1u, gatt_client->attribute_offset); 1866 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, size - 1u); 1867 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1868 break; 1869 1870 // Use ATT_READ_REQUEST for first blob of Read Long Characteristic Descriptor 1871 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 1872 report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], 1873 size - 1u, gatt_client->attribute_offset); 1874 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, 1875 size - 1u); 1876 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1877 break; 1878 1879 default: 1880 break; 1881 } 1882 } 1883 1884 static void gatt_client_handle_att_read_by_type_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { 1885 switch (gatt_client->state) { 1886 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 1887 report_gatt_characteristics(gatt_client, packet, size); 1888 trigger_next_characteristic_query(gatt_client, 1889 get_last_result_handle_from_characteristics_list(packet, size)); 1890 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1891 break; 1892 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 1893 report_gatt_characteristics(gatt_client, packet, size); 1894 trigger_next_characteristic_query(gatt_client, 1895 get_last_result_handle_from_characteristics_list(packet, size)); 1896 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1897 break; 1898 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: { 1899 if (size < 2u) break; 1900 uint16_t uuid16 = 0; 1901 uint16_t pair_size = packet[1]; 1902 1903 if (pair_size == 6u) { 1904 if (size < 8u) break; 1905 // UUIDs not available, query first included service 1906 gatt_client->start_group_handle = little_endian_read_16(packet, 2); // ready for next query 1907 gatt_client->query_start_handle = little_endian_read_16(packet, 4); 1908 gatt_client->query_end_handle = little_endian_read_16(packet, 6); 1909 gatt_client->state = P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY; 1910 break; 1911 } 1912 1913 if (pair_size != 8u) break; 1914 1915 // UUIDs included, report all of them 1916 uint16_t offset; 1917 for (offset = 2u; (offset + 8u) <= size; offset += pair_size) { 1918 uint16_t include_handle = little_endian_read_16(packet, offset); 1919 gatt_client->query_start_handle = little_endian_read_16(packet, offset + 2u); 1920 gatt_client->query_end_handle = little_endian_read_16(packet, offset + 4u); 1921 uuid16 = little_endian_read_16(packet, offset + 6u); 1922 report_gatt_included_service_uuid16(gatt_client, include_handle, uuid16); 1923 } 1924 1925 trigger_next_included_service_query(gatt_client, 1926 get_last_result_handle_from_included_services_list(packet, 1927 size)); 1928 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1929 break; 1930 } 1931 #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1932 case P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT: 1933 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, 2); 1934 gatt_client->state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 1935 break; 1936 #endif 1937 case P_W4_READ_BY_TYPE_RESPONSE: { 1938 uint16_t pair_size = packet[1]; 1939 // set last result handle to last valid handle, only used if pair_size invalid 1940 uint16_t last_result_handle = 0xffff; 1941 if (pair_size > 2) { 1942 uint16_t offset; 1943 for (offset = 2; offset < size; offset += pair_size) { 1944 uint16_t value_handle = little_endian_read_16(packet, offset); 1945 report_gatt_characteristic_value(gatt_client, value_handle, &packet[offset + 2u], 1946 pair_size - 2u); 1947 last_result_handle = value_handle; 1948 } 1949 } 1950 trigger_next_read_by_type_query(gatt_client, last_result_handle); 1951 break; 1952 } 1953 default: 1954 break; 1955 } 1956 } 1957 1958 static void gatt_client_handle_att_write_response(gatt_client_t *gatt_client) { 1959 switch (gatt_client->state) { 1960 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 1961 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1962 break; 1963 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 1964 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1965 break; 1966 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1967 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1968 break; 1969 default: 1970 break; 1971 } 1972 } 1973 1974 static void gatt_client_handle_att_response(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size) { 1975 uint8_t att_status; 1976 switch (packet[0]) { 1977 case ATT_EXCHANGE_MTU_RESPONSE: { 1978 if (size < 3u) break; 1979 bool update_gatt_server_att_mtu = false; 1980 uint16_t remote_rx_mtu = little_endian_read_16(packet, 1); 1981 uint16_t local_rx_mtu = l2cap_max_le_mtu(); 1982 switch (gatt_client->bearer_type){ 1983 case ATT_BEARER_UNENHANCED_LE: 1984 update_gatt_server_att_mtu = true; 1985 break; 1986 #ifdef ENABLE_GATT_OVER_CLASSIC 1987 case ATT_BEARER_UNENHANCED_CLASSIC: 1988 local_rx_mtu = gatt_client->mtu; 1989 break; 1990 #endif 1991 default: 1992 btstack_unreachable(); 1993 break; 1994 } 1995 1996 uint16_t mtu = (remote_rx_mtu < local_rx_mtu) ? remote_rx_mtu : local_rx_mtu; 1997 1998 // set gatt client mtu 1999 gatt_client->mtu = mtu; 2000 gatt_client->mtu_state = MTU_EXCHANGED; 2001 2002 if (update_gatt_server_att_mtu){ 2003 // set per connection mtu state - for fixed channel 2004 hci_connection_t *hci_connection = hci_connection_for_handle(gatt_client->con_handle); 2005 hci_connection->att_connection.mtu = gatt_client->mtu; 2006 hci_connection->att_connection.mtu_exchanged = true; 2007 } 2008 emit_gatt_mtu_exchanged_result_event(gatt_client, gatt_client->mtu); 2009 break; 2010 } 2011 case ATT_READ_BY_GROUP_TYPE_RESPONSE: 2012 switch (gatt_client->state) { 2013 case P_W4_SERVICE_QUERY_RESULT: 2014 report_gatt_services(gatt_client, packet, size); 2015 trigger_next_service_query(gatt_client, get_last_result_handle_from_service_list(packet, size)); 2016 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2017 break; 2018 default: 2019 break; 2020 } 2021 break; 2022 case ATT_HANDLE_VALUE_NOTIFICATION: 2023 if (size < 3u) return; 2024 report_gatt_notification(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); 2025 return; 2026 #ifdef ENABLE_GATT_OVER_EATT 2027 case ATT_MULTIPLE_HANDLE_VALUE_NTF: 2028 if (size >= 5u) { 2029 uint16_t offset = 1; 2030 while (true){ 2031 uint16_t value_handle = little_endian_read_16(packet, offset); 2032 offset += 2; 2033 uint16_t value_length = little_endian_read_16(packet, offset); 2034 offset += 2; 2035 if ((offset + value_length) > size) break; 2036 report_gatt_notification(gatt_client, value_handle, &packet[offset], value_length); 2037 offset += value_length; 2038 } 2039 } 2040 return; 2041 #endif 2042 case ATT_HANDLE_VALUE_INDICATION: 2043 if (size < 3u) break; 2044 report_gatt_indication(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); 2045 gatt_client->send_confirmation = true; 2046 break; 2047 case ATT_READ_BY_TYPE_RESPONSE: 2048 gatt_client_handle_att_read_by_type_response(gatt_client, packet, size); 2049 break; 2050 case ATT_READ_RESPONSE: 2051 gatt_client_handle_att_read_response(gatt_client, packet, size); 2052 break; 2053 case ATT_FIND_BY_TYPE_VALUE_RESPONSE: { 2054 uint8_t pair_size = 4; 2055 int i; 2056 uint16_t start_group_handle; 2057 uint16_t end_group_handle = 0xffff; // asserts GATT_EVENT_QUERY_COMPLETE is emitted if no results 2058 for (i = 1u; (i + pair_size) <= size; i += pair_size) { 2059 start_group_handle = little_endian_read_16(packet, i); 2060 end_group_handle = little_endian_read_16(packet, i + 2); 2061 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, 2062 gatt_client->uuid128); 2063 } 2064 trigger_next_service_by_uuid_query(gatt_client, end_group_handle); 2065 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2066 break; 2067 } 2068 case ATT_FIND_INFORMATION_REPLY: { 2069 if (size < 2u) break; 2070 2071 uint8_t pair_size = 4; 2072 if (packet[1u] == 2u) { 2073 pair_size = 18; 2074 } 2075 uint16_t offset = 2; 2076 2077 if (size < (pair_size + offset)) break; 2078 uint16_t last_descriptor_handle = little_endian_read_16(packet, size - pair_size); 2079 2080 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 2081 log_info("ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY, state %x", gatt_client->gatt_client_state); 2082 if (gatt_client->gatt_client_state == P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT){ 2083 // iterate over descriptors looking for CCC 2084 if (pair_size == 4){ 2085 while ((offset + 4) <= size){ 2086 uint16_t uuid16 = little_endian_read_16(packet, offset + 2); 2087 if (uuid16 == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION){ 2088 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, offset); 2089 gatt_client->gatt_client_state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 2090 log_info("CCC found %x", gatt_client->client_characteristic_configuration_handle); 2091 break; 2092 } 2093 offset += pair_size; 2094 } 2095 } 2096 if (is_query_done(gatt_client, last_descriptor_handle)){ 2097 2098 } else { 2099 // next 2100 gatt_client->start_group_handle = last_descriptor_handle + 1; 2101 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2102 } 2103 break; 2104 } 2105 #endif 2106 report_gatt_all_characteristic_descriptors(gatt_client, &packet[2], size - 2u, pair_size); 2107 trigger_next_characteristic_descriptor_query(gatt_client, last_descriptor_handle); 2108 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2109 break; 2110 } 2111 2112 case ATT_WRITE_RESPONSE: 2113 gatt_client_handle_att_write_response(gatt_client); 2114 break; 2115 2116 case ATT_READ_BLOB_RESPONSE: { 2117 uint16_t received_blob_length = size - 1u; 2118 switch (gatt_client->state) { 2119 case P_W4_READ_BLOB_RESULT: 2120 report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], 2121 received_blob_length, gatt_client->attribute_offset); 2122 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, received_blob_length); 2123 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2124 break; 2125 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 2126 report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, 2127 &packet[1], received_blob_length, 2128 gatt_client->attribute_offset); 2129 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, 2130 received_blob_length); 2131 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2132 break; 2133 default: 2134 break; 2135 } 2136 break; 2137 } 2138 case ATT_PREPARE_WRITE_RESPONSE: 2139 switch (gatt_client->state) { 2140 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 2141 if (is_value_valid(gatt_client, packet, size)) { 2142 att_status = ATT_ERROR_SUCCESS; 2143 } else { 2144 att_status = ATT_ERROR_DATA_MISMATCH; 2145 } 2146 gatt_client_handle_transaction_complete(gatt_client, att_status); 2147 break; 2148 2149 case P_W4_PREPARE_WRITE_RESULT: { 2150 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 2151 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE, P_W2_EXECUTE_PREPARED_WRITE); 2152 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2153 break; 2154 } 2155 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: { 2156 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 2157 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR, 2158 P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR); 2159 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2160 break; 2161 } 2162 case P_W4_PREPARE_RELIABLE_WRITE_RESULT: { 2163 if (is_value_valid(gatt_client, packet, size)) { 2164 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 2165 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_RELIABLE_WRITE, 2166 P_W2_EXECUTE_PREPARED_WRITE); 2167 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 2168 break; 2169 } 2170 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 2171 break; 2172 } 2173 default: 2174 break; 2175 } 2176 break; 2177 2178 case ATT_EXECUTE_WRITE_RESPONSE: 2179 switch (gatt_client->state) { 2180 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 2181 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2182 break; 2183 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 2184 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2185 break; 2186 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 2187 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_DATA_MISMATCH); 2188 break; 2189 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2190 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2191 break; 2192 default: 2193 break; 2194 2195 } 2196 break; 2197 2198 case ATT_READ_MULTIPLE_RESPONSE: 2199 switch (gatt_client->state) { 2200 case P_W4_READ_MULTIPLE_RESPONSE: 2201 report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); 2202 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2203 break; 2204 default: 2205 break; 2206 } 2207 break; 2208 2209 #ifdef ENABLE_GATT_OVER_EATT 2210 case ATT_READ_MULTIPLE_VARIABLE_RSP: 2211 switch (gatt_client->state) { 2212 case P_W4_READ_MULTIPLE_VARIABLE_RESPONSE: 2213 report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); 2214 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2215 break; 2216 default: 2217 break; 2218 } 2219 break; 2220 #endif 2221 2222 case ATT_ERROR_RESPONSE: 2223 if (size < 5u) return; 2224 att_status = packet[4]; 2225 switch (att_status) { 2226 case ATT_ERROR_ATTRIBUTE_NOT_FOUND: { 2227 switch (gatt_client->state) { 2228 case P_W4_SERVICE_QUERY_RESULT: 2229 case P_W4_SERVICE_WITH_UUID_RESULT: 2230 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: 2231 case P_W4_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT: 2232 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2233 break; 2234 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 2235 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 2236 report_gatt_characteristic_end_found(gatt_client, gatt_client->end_group_handle); 2237 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 2238 break; 2239 case P_W4_READ_BY_TYPE_RESPONSE: 2240 if (gatt_client->start_group_handle == gatt_client->query_start_handle) { 2241 att_status = ATT_ERROR_ATTRIBUTE_NOT_FOUND; 2242 } else { 2243 att_status = ATT_ERROR_SUCCESS; 2244 } 2245 gatt_client_handle_transaction_complete(gatt_client, att_status); 2246 break; 2247 default: 2248 gatt_client_report_error_if_pending(gatt_client, att_status); 2249 break; 2250 } 2251 break; 2252 } 2253 2254 #ifdef ENABLE_GATT_CLIENT_PAIRING 2255 2256 case ATT_ERROR_INSUFFICIENT_AUTHENTICATION: 2257 case ATT_ERROR_INSUFFICIENT_ENCRYPTION_KEY_SIZE: 2258 case ATT_ERROR_INSUFFICIENT_ENCRYPTION: { 2259 2260 // security too low 2261 if (gatt_client->security_counter > 0) { 2262 gatt_client_report_error_if_pending(gatt_client, att_status); 2263 break; 2264 } 2265 // start security 2266 gatt_client->security_counter++; 2267 2268 // setup action 2269 int retry = 1; 2270 switch (gatt_client->state){ 2271 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 2272 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY ; 2273 break; 2274 case P_W4_READ_BLOB_RESULT: 2275 gatt_client->state = P_W2_SEND_READ_BLOB_QUERY; 2276 break; 2277 case P_W4_READ_BY_TYPE_RESPONSE: 2278 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2279 break; 2280 case P_W4_READ_MULTIPLE_RESPONSE: 2281 gatt_client->state = P_W2_SEND_READ_MULTIPLE_REQUEST; 2282 break; 2283 case P_W4_READ_MULTIPLE_VARIABLE_RESPONSE: 2284 gatt_client->state = P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST; 2285 break; 2286 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 2287 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 2288 break; 2289 case P_W4_PREPARE_WRITE_RESULT: 2290 gatt_client->state = P_W2_PREPARE_WRITE; 2291 break; 2292 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 2293 gatt_client->state = P_W2_PREPARE_WRITE_SINGLE; 2294 break; 2295 case P_W4_PREPARE_RELIABLE_WRITE_RESULT: 2296 gatt_client->state = P_W2_PREPARE_RELIABLE_WRITE; 2297 break; 2298 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 2299 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE; 2300 break; 2301 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 2302 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE; 2303 break; 2304 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 2305 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 2306 break; 2307 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: 2308 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 2309 break; 2310 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 2311 gatt_client->state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 2312 break; 2313 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2314 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 2315 break; 2316 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 2317 gatt_client->state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 2318 break; 2319 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2320 gatt_client->state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 2321 break; 2322 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2323 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR; 2324 break; 2325 #ifdef ENABLE_LE_SIGNED_WRITE 2326 case P_W4_SEND_SIGNED_WRITE_DONE: 2327 gatt_client->state = P_W2_SEND_SIGNED_WRITE; 2328 break; 2329 #endif 2330 default: 2331 log_info("retry not supported for state %x", gatt_client->state); 2332 retry = 0; 2333 break; 2334 } 2335 2336 if (!retry) { 2337 gatt_client_report_error_if_pending(gatt_client, att_status); 2338 break; 2339 } 2340 2341 log_info("security error, start pairing"); 2342 2343 // start pairing for higher security level 2344 gatt_client->wait_for_authentication_complete = true; 2345 gatt_client->pending_error_code = att_status; 2346 sm_request_pairing(gatt_client->con_handle); 2347 break; 2348 } 2349 #endif 2350 2351 // nothing we can do about that 2352 case ATT_ERROR_INSUFFICIENT_AUTHORIZATION: 2353 default: 2354 gatt_client_report_error_if_pending(gatt_client, att_status); 2355 break; 2356 } 2357 break; 2358 2359 default: 2360 log_info("ATT Handler, unhandled response type 0x%02x", packet[0]); 2361 break; 2362 } 2363 } 2364 2365 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size) { 2366 gatt_client_t *gatt_client; 2367 #ifdef ENABLE_GATT_OVER_CLASSIC 2368 uint8_t status; 2369 hci_connection_t * hci_connection; 2370 hci_con_handle_t con_handle; 2371 #endif 2372 2373 if (size < 1u) return; 2374 switch (packet_type){ 2375 case HCI_EVENT_PACKET: 2376 switch (hci_event_packet_get_type(packet)) { 2377 #ifdef ENABLE_GATT_OVER_CLASSIC 2378 case L2CAP_EVENT_CHANNEL_OPENED: 2379 status = l2cap_event_channel_opened_get_status(packet); 2380 gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_opened_get_local_cid(packet)); 2381 if (gatt_client != NULL){ 2382 con_handle = l2cap_event_channel_opened_get_handle(packet); 2383 hci_connection = hci_connection_for_handle(con_handle); 2384 if (status == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_RESOURCES){ 2385 if ((hci_connection != NULL) && hci_connection->att_server.incoming_connection_request) { 2386 log_info("Collision, retry in 100ms"); 2387 gatt_client->state = P_W2_L2CAP_CONNECT; 2388 // set timer for retry 2389 btstack_run_loop_set_timer(&gatt_client->gc_timeout, GATT_CLIENT_COLLISION_BACKOFF_MS); 2390 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_classic_retry); 2391 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 2392 break; 2393 } 2394 } 2395 // if status != 0, gatt_client will be discarded 2396 gatt_client->state = P_READY; 2397 gatt_client->con_handle = l2cap_event_channel_opened_get_handle(packet); 2398 gatt_client->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); 2399 gatt_client_classic_handle_connected(gatt_client, status); 2400 } 2401 break; 2402 case L2CAP_EVENT_CHANNEL_CLOSED: 2403 gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_closed_get_local_cid(packet)); 2404 if (gatt_client != NULL){ 2405 // discard gatt client object 2406 gatt_client_classic_handle_disconnected(gatt_client); 2407 } 2408 break; 2409 #endif 2410 case L2CAP_EVENT_CAN_SEND_NOW: 2411 gatt_client_run(); 2412 break; 2413 // att_server has negotiated the mtu for this connection, cache if context exists 2414 case ATT_EVENT_MTU_EXCHANGE_COMPLETE: 2415 if (size < 6u) break; 2416 gatt_client = gatt_client_get_context_for_handle(handle); 2417 if (gatt_client != NULL) { 2418 gatt_client->mtu = little_endian_read_16(packet, 4); 2419 } 2420 break; 2421 default: 2422 break; 2423 } 2424 break; 2425 2426 case ATT_DATA_PACKET: 2427 // special cases: notifications & indications motivate creating context 2428 switch (packet[0]) { 2429 case ATT_HANDLE_VALUE_NOTIFICATION: 2430 case ATT_HANDLE_VALUE_INDICATION: 2431 gatt_client_provide_context_for_handle(handle, &gatt_client); 2432 break; 2433 default: 2434 gatt_client = gatt_client_get_context_for_handle(handle); 2435 break; 2436 } 2437 2438 if (gatt_client != NULL) { 2439 gatt_client_handle_att_response(gatt_client, packet, size); 2440 gatt_client_run(); 2441 } 2442 break; 2443 2444 #ifdef ENABLE_GATT_OVER_CLASSIC 2445 case L2CAP_DATA_PACKET: 2446 gatt_client = gatt_client_get_context_for_l2cap_cid(handle); 2447 if (gatt_client != NULL){ 2448 gatt_client_handle_att_response(gatt_client, packet, size); 2449 gatt_client_run(); 2450 } 2451 break; 2452 #endif 2453 2454 default: 2455 break; 2456 } 2457 } 2458 2459 #ifdef ENABLE_LE_SIGNED_WRITE 2460 static void att_signed_write_handle_cmac_result(uint8_t hash[8]){ 2461 btstack_linked_list_iterator_t it; 2462 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 2463 while (btstack_linked_list_iterator_has_next(&it)){ 2464 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 2465 if (gatt_client->state == P_W4_CMAC_RESULT){ 2466 // store result 2467 (void)memcpy(gatt_client->cmac, hash, 8); 2468 // reverse_64(hash, gatt_client->cmac); 2469 gatt_client->state = P_W2_SEND_SIGNED_WRITE; 2470 gatt_client_run(); 2471 return; 2472 } 2473 } 2474 } 2475 2476 uint8_t gatt_client_signed_write_without_response(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t message_len, uint8_t * message){ 2477 gatt_client_t * gatt_client; 2478 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2479 if (status != ERROR_CODE_SUCCESS){ 2480 return status; 2481 } 2482 if (is_ready(gatt_client) == 0){ 2483 return GATT_CLIENT_IN_WRONG_STATE; 2484 } 2485 2486 gatt_client->callback = callback; 2487 gatt_client->attribute_handle = value_handle; 2488 gatt_client->attribute_length = message_len; 2489 gatt_client->attribute_value = message; 2490 gatt_client->state = P_W4_IDENTITY_RESOLVING; 2491 gatt_client_run(); 2492 return ERROR_CODE_SUCCESS; 2493 } 2494 #endif 2495 2496 uint8_t gatt_client_discover_primary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2497 gatt_client_t * gatt_client; 2498 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2499 if (status != ERROR_CODE_SUCCESS){ 2500 return status; 2501 } 2502 2503 gatt_client->callback = callback; 2504 gatt_client->start_group_handle = 0x0001; 2505 gatt_client->end_group_handle = 0xffff; 2506 gatt_client->state = P_W2_SEND_SERVICE_QUERY; 2507 gatt_client->uuid16 = GATT_PRIMARY_SERVICE_UUID; 2508 gatt_client_run(); 2509 return ERROR_CODE_SUCCESS; 2510 } 2511 2512 uint8_t gatt_client_discover_secondary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2513 gatt_client_t * gatt_client; 2514 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2515 if (status != ERROR_CODE_SUCCESS){ 2516 return status; 2517 } 2518 2519 gatt_client->callback = callback; 2520 gatt_client->start_group_handle = 0x0001; 2521 gatt_client->end_group_handle = 0xffff; 2522 gatt_client->state = P_W2_SEND_SERVICE_QUERY; 2523 gatt_client->uuid16 = GATT_SECONDARY_SERVICE_UUID; 2524 gatt_client_run(); 2525 return ERROR_CODE_SUCCESS; 2526 } 2527 2528 uint8_t gatt_client_discover_primary_services_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t uuid16){ 2529 gatt_client_t * gatt_client; 2530 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2531 if (status != ERROR_CODE_SUCCESS){ 2532 return status; 2533 } 2534 2535 gatt_client->callback = callback; 2536 gatt_client->start_group_handle = 0x0001; 2537 gatt_client->end_group_handle = 0xffff; 2538 gatt_client->state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 2539 gatt_client->uuid16 = uuid16; 2540 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), gatt_client->uuid16); 2541 gatt_client_run(); 2542 return ERROR_CODE_SUCCESS; 2543 } 2544 2545 uint8_t gatt_client_discover_primary_services_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, const uint8_t * uuid128){ 2546 gatt_client_t * gatt_client; 2547 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2548 if (status != ERROR_CODE_SUCCESS){ 2549 return status; 2550 } 2551 2552 gatt_client->callback = callback; 2553 gatt_client->start_group_handle = 0x0001; 2554 gatt_client->end_group_handle = 0xffff; 2555 gatt_client->uuid16 = 0; 2556 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2557 gatt_client->state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 2558 gatt_client_run(); 2559 return ERROR_CODE_SUCCESS; 2560 } 2561 2562 uint8_t gatt_client_discover_characteristics_for_service(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service){ 2563 gatt_client_t * gatt_client; 2564 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2565 if (status != ERROR_CODE_SUCCESS){ 2566 return status; 2567 } 2568 2569 gatt_client->callback = callback; 2570 gatt_client->start_group_handle = service->start_group_handle; 2571 gatt_client->end_group_handle = service->end_group_handle; 2572 gatt_client->filter_with_uuid = false; 2573 gatt_client->characteristic_start_handle = 0; 2574 gatt_client->state = P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY; 2575 gatt_client_run(); 2576 return ERROR_CODE_SUCCESS; 2577 } 2578 2579 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){ 2580 gatt_client_t * gatt_client; 2581 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2582 if (status != ERROR_CODE_SUCCESS){ 2583 return status; 2584 } 2585 2586 gatt_client->callback = callback; 2587 gatt_client->start_group_handle = service->start_group_handle; 2588 gatt_client->end_group_handle = service->end_group_handle; 2589 gatt_client->state = P_W2_SEND_INCLUDED_SERVICE_QUERY; 2590 2591 gatt_client_run(); 2592 return ERROR_CODE_SUCCESS; 2593 } 2594 2595 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){ 2596 gatt_client_t * gatt_client; 2597 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2598 if (status != ERROR_CODE_SUCCESS){ 2599 return status; 2600 } 2601 2602 gatt_client->callback = callback; 2603 gatt_client->start_group_handle = start_handle; 2604 gatt_client->end_group_handle = end_handle; 2605 gatt_client->filter_with_uuid = true; 2606 gatt_client->uuid16 = uuid16; 2607 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 2608 gatt_client->characteristic_start_handle = 0; 2609 gatt_client->state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 2610 gatt_client_run(); 2611 return ERROR_CODE_SUCCESS; 2612 } 2613 2614 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){ 2615 gatt_client_t * gatt_client; 2616 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2617 if (status != ERROR_CODE_SUCCESS){ 2618 return status; 2619 } 2620 2621 gatt_client->callback = callback; 2622 gatt_client->start_group_handle = start_handle; 2623 gatt_client->end_group_handle = end_handle; 2624 gatt_client->filter_with_uuid = true; 2625 gatt_client->uuid16 = 0; 2626 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2627 gatt_client->characteristic_start_handle = 0; 2628 gatt_client->state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 2629 gatt_client_run(); 2630 return ERROR_CODE_SUCCESS; 2631 } 2632 2633 2634 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){ 2635 return gatt_client_discover_characteristics_for_handle_range_by_uuid16(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid16); 2636 } 2637 2638 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){ 2639 return gatt_client_discover_characteristics_for_handle_range_by_uuid128(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid128); 2640 } 2641 2642 uint8_t gatt_client_discover_characteristic_descriptors(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 2643 gatt_client_t * gatt_client; 2644 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2645 if (status != ERROR_CODE_SUCCESS){ 2646 return status; 2647 } 2648 2649 // check if there is space for characteristics descriptors 2650 if (characteristic->end_handle > characteristic->value_handle){ 2651 gatt_client->callback = callback; 2652 gatt_client->start_group_handle = characteristic->value_handle + 1u; 2653 gatt_client->end_group_handle = characteristic->end_handle; 2654 gatt_client->state = P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY; 2655 gatt_client_run(); 2656 } else { 2657 // schedule gatt complete event on next run loop iteration otherwise 2658 gatt_client->state = P_W2_EMIT_QUERY_COMPLETE_EVENT; 2659 gatt_client_deferred_event_emit.callback = gatt_client_emit_events; 2660 btstack_run_loop_execute_on_main_thread(&gatt_client_deferred_event_emit); 2661 } 2662 return ERROR_CODE_SUCCESS; 2663 } 2664 2665 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){ 2666 gatt_client_t * gatt_client; 2667 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2668 if (status != ERROR_CODE_SUCCESS){ 2669 return status; 2670 } 2671 2672 gatt_client->callback = callback; 2673 gatt_client->attribute_handle = value_handle; 2674 gatt_client->attribute_offset = 0; 2675 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY; 2676 gatt_client_run(); 2677 return ERROR_CODE_SUCCESS; 2678 } 2679 2680 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){ 2681 gatt_client_t * gatt_client; 2682 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2683 if (status != ERROR_CODE_SUCCESS){ 2684 return status; 2685 } 2686 2687 gatt_client->callback = callback; 2688 gatt_client->start_group_handle = start_handle; 2689 gatt_client->end_group_handle = end_handle; 2690 gatt_client->query_start_handle = start_handle; 2691 gatt_client->query_end_handle = end_handle; 2692 gatt_client->uuid16 = uuid16; 2693 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 2694 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2695 gatt_client_run(); 2696 return ERROR_CODE_SUCCESS; 2697 } 2698 2699 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){ 2700 gatt_client_t * gatt_client; 2701 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2702 if (status != ERROR_CODE_SUCCESS){ 2703 return status; 2704 } 2705 2706 gatt_client->callback = callback; 2707 gatt_client->start_group_handle = start_handle; 2708 gatt_client->end_group_handle = end_handle; 2709 gatt_client->query_start_handle = start_handle; 2710 gatt_client->query_end_handle = end_handle; 2711 gatt_client->uuid16 = 0; 2712 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2713 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2714 gatt_client_run(); 2715 return ERROR_CODE_SUCCESS; 2716 } 2717 2718 2719 uint8_t gatt_client_read_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 2720 return gatt_client_read_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); 2721 } 2722 2723 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){ 2724 gatt_client_t * gatt_client; 2725 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2726 if (status != ERROR_CODE_SUCCESS){ 2727 return status; 2728 } 2729 2730 gatt_client->callback = callback; 2731 gatt_client->attribute_handle = value_handle; 2732 gatt_client->attribute_offset = offset; 2733 gatt_client->state = P_W2_SEND_READ_BLOB_QUERY; 2734 gatt_client_run(); 2735 return ERROR_CODE_SUCCESS; 2736 } 2737 2738 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){ 2739 return gatt_client_read_long_value_of_characteristic_using_value_handle_with_offset(callback, con_handle, value_handle, 0); 2740 } 2741 2742 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){ 2743 return gatt_client_read_long_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); 2744 } 2745 2746 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){ 2747 gatt_client_t * gatt_client; 2748 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2749 if (status != ERROR_CODE_SUCCESS){ 2750 return status; 2751 } 2752 2753 #ifdef ENABLE_GATT_OVER_EATT 2754 if (state == P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST){ 2755 if (gatt_client->bearer_type != ATT_BEARER_ENHANCED_LE){ 2756 return ERROR_CODE_COMMAND_DISALLOWED; 2757 } 2758 } 2759 #endif 2760 2761 gatt_client->callback = callback; 2762 gatt_client->read_multiple_handle_count = num_value_handles; 2763 gatt_client->read_multiple_handles = value_handles; 2764 gatt_client->state = state; 2765 gatt_client_run(); 2766 return ERROR_CODE_SUCCESS; 2767 } 2768 2769 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){ 2770 return gatt_client_read_multiple_characteristic_values_with_state(callback, con_handle, num_value_handles, value_handles, P_W2_SEND_READ_MULTIPLE_REQUEST); 2771 } 2772 2773 #ifdef ENABLE_GATT_OVER_EATT 2774 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){ 2775 return gatt_client_read_multiple_characteristic_values_with_state(callback, con_handle, num_value_handles, value_handles, P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST); 2776 } 2777 #endif 2778 2779 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){ 2780 gatt_client_t * gatt_client; 2781 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2782 if (status != ERROR_CODE_SUCCESS){ 2783 return status; 2784 } 2785 2786 if (value_length > (gatt_client->mtu - 3u)) return GATT_CLIENT_VALUE_TOO_LONG; 2787 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) return GATT_CLIENT_BUSY; 2788 2789 return att_write_request(gatt_client, ATT_WRITE_COMMAND, value_handle, value_length, value); 2790 } 2791 2792 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){ 2793 gatt_client_t * gatt_client; 2794 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2795 if (status != ERROR_CODE_SUCCESS){ 2796 return status; 2797 } 2798 2799 gatt_client->callback = callback; 2800 gatt_client->attribute_handle = value_handle; 2801 gatt_client->attribute_length = value_length; 2802 gatt_client->attribute_value = value; 2803 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 2804 gatt_client_run(); 2805 return ERROR_CODE_SUCCESS; 2806 } 2807 2808 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){ 2809 gatt_client_t * gatt_client; 2810 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2811 if (status != ERROR_CODE_SUCCESS){ 2812 return status; 2813 } 2814 2815 gatt_client->callback = callback; 2816 gatt_client->attribute_handle = value_handle; 2817 gatt_client->attribute_length = value_length; 2818 gatt_client->attribute_offset = offset; 2819 gatt_client->attribute_value = value; 2820 gatt_client->state = P_W2_PREPARE_WRITE; 2821 gatt_client_run(); 2822 return ERROR_CODE_SUCCESS; 2823 } 2824 2825 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){ 2826 return gatt_client_write_long_value_of_characteristic_with_offset(callback, con_handle, value_handle, 0, value_length, value); 2827 } 2828 2829 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){ 2830 gatt_client_t * gatt_client; 2831 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2832 if (status != ERROR_CODE_SUCCESS){ 2833 return status; 2834 } 2835 2836 gatt_client->callback = callback; 2837 gatt_client->attribute_handle = value_handle; 2838 gatt_client->attribute_length = value_length; 2839 gatt_client->attribute_offset = 0; 2840 gatt_client->attribute_value = value; 2841 gatt_client->state = P_W2_PREPARE_RELIABLE_WRITE; 2842 gatt_client_run(); 2843 return ERROR_CODE_SUCCESS; 2844 } 2845 2846 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){ 2847 gatt_client_t * gatt_client; 2848 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2849 if (status != ERROR_CODE_SUCCESS){ 2850 return status; 2851 } 2852 2853 if (configuration > 3){ 2854 return ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE; 2855 } 2856 2857 if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION) && 2858 ((characteristic->properties & ATT_PROPERTY_NOTIFY) == 0u)) { 2859 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED"); 2860 return GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED; 2861 } else if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION) && 2862 ((characteristic->properties & ATT_PROPERTY_INDICATE) == 0u)){ 2863 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED"); 2864 return GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED; 2865 } 2866 2867 gatt_client->callback = callback; 2868 gatt_client->start_group_handle = characteristic->value_handle; 2869 gatt_client->end_group_handle = characteristic->end_handle; 2870 little_endian_store_16(gatt_client->client_characteristic_configuration_value, 0, configuration); 2871 2872 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 2873 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2874 #else 2875 gatt_client->state = P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2876 #endif 2877 gatt_client_run(); 2878 return ERROR_CODE_SUCCESS; 2879 } 2880 2881 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){ 2882 gatt_client_t * gatt_client; 2883 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2884 if (status != ERROR_CODE_SUCCESS){ 2885 return status; 2886 } 2887 2888 gatt_client->callback = callback; 2889 gatt_client->attribute_handle = descriptor_handle; 2890 2891 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 2892 gatt_client_run(); 2893 return ERROR_CODE_SUCCESS; 2894 } 2895 2896 uint8_t gatt_client_read_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor){ 2897 return gatt_client_read_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2898 } 2899 2900 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){ 2901 gatt_client_t * gatt_client; 2902 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2903 if (status != ERROR_CODE_SUCCESS){ 2904 return status; 2905 } 2906 2907 gatt_client->callback = callback; 2908 gatt_client->attribute_handle = descriptor_handle; 2909 gatt_client->attribute_offset = offset; 2910 gatt_client->state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 2911 gatt_client_run(); 2912 return ERROR_CODE_SUCCESS; 2913 } 2914 2915 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){ 2916 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0); 2917 } 2918 2919 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){ 2920 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2921 } 2922 2923 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){ 2924 gatt_client_t * gatt_client; 2925 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2926 if (status != ERROR_CODE_SUCCESS){ 2927 return status; 2928 } 2929 2930 gatt_client->callback = callback; 2931 gatt_client->attribute_handle = descriptor_handle; 2932 gatt_client->attribute_length = value_length; 2933 gatt_client->attribute_offset = 0; 2934 gatt_client->attribute_value = value; 2935 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 2936 gatt_client_run(); 2937 return ERROR_CODE_SUCCESS; 2938 } 2939 2940 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){ 2941 return gatt_client_write_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); 2942 } 2943 2944 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){ 2945 gatt_client_t * gatt_client; 2946 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2947 if (status != ERROR_CODE_SUCCESS){ 2948 return status; 2949 } 2950 2951 gatt_client->callback = callback; 2952 gatt_client->attribute_handle = descriptor_handle; 2953 gatt_client->attribute_length = value_length; 2954 gatt_client->attribute_offset = offset; 2955 gatt_client->attribute_value = value; 2956 gatt_client->state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 2957 gatt_client_run(); 2958 return ERROR_CODE_SUCCESS; 2959 } 2960 2961 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){ 2962 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0, value_length, value); 2963 } 2964 2965 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){ 2966 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); 2967 } 2968 2969 /** 2970 * @brief -> gatt complete event 2971 */ 2972 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){ 2973 gatt_client_t * gatt_client; 2974 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2975 if (status != ERROR_CODE_SUCCESS){ 2976 return status; 2977 } 2978 2979 gatt_client->callback = callback; 2980 gatt_client->attribute_handle = attribute_handle; 2981 gatt_client->attribute_length = value_length; 2982 gatt_client->attribute_offset = offset; 2983 gatt_client->attribute_value = value; 2984 gatt_client->state = P_W2_PREPARE_WRITE_SINGLE; 2985 gatt_client_run(); 2986 return ERROR_CODE_SUCCESS; 2987 } 2988 2989 /** 2990 * @brief -> gatt complete event 2991 */ 2992 uint8_t gatt_client_execute_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2993 gatt_client_t * gatt_client; 2994 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2995 if (status != ERROR_CODE_SUCCESS){ 2996 return status; 2997 } 2998 2999 gatt_client->callback = callback; 3000 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE; 3001 gatt_client_run(); 3002 return ERROR_CODE_SUCCESS; 3003 } 3004 3005 /** 3006 * @brief -> gatt complete event 3007 */ 3008 uint8_t gatt_client_cancel_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3009 gatt_client_t * gatt_client; 3010 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 3011 if (status != ERROR_CODE_SUCCESS){ 3012 return status; 3013 } 3014 3015 gatt_client->callback = callback; 3016 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE; 3017 gatt_client_run(); 3018 return ERROR_CODE_SUCCESS; 3019 } 3020 3021 void gatt_client_deserialize_service(const uint8_t *packet, int offset, gatt_client_service_t * service){ 3022 service->start_group_handle = little_endian_read_16(packet, offset); 3023 service->end_group_handle = little_endian_read_16(packet, offset + 2); 3024 reverse_128(&packet[offset + 4], service->uuid128); 3025 if (uuid_has_bluetooth_prefix(service->uuid128)){ 3026 service->uuid16 = big_endian_read_32(service->uuid128, 0); 3027 } else { 3028 service->uuid16 = 0; 3029 } 3030 } 3031 3032 void gatt_client_deserialize_characteristic(const uint8_t * packet, int offset, gatt_client_characteristic_t * characteristic){ 3033 characteristic->start_handle = little_endian_read_16(packet, offset); 3034 characteristic->value_handle = little_endian_read_16(packet, offset + 2); 3035 characteristic->end_handle = little_endian_read_16(packet, offset + 4); 3036 characteristic->properties = little_endian_read_16(packet, offset + 6); 3037 reverse_128(&packet[offset+8], characteristic->uuid128); 3038 if (uuid_has_bluetooth_prefix(characteristic->uuid128)){ 3039 characteristic->uuid16 = big_endian_read_32(characteristic->uuid128, 0); 3040 } else { 3041 characteristic->uuid16 = 0; 3042 } 3043 } 3044 3045 void gatt_client_deserialize_characteristic_descriptor(const uint8_t * packet, int offset, gatt_client_characteristic_descriptor_t * descriptor){ 3046 descriptor->handle = little_endian_read_16(packet, offset); 3047 reverse_128(&packet[offset+2], descriptor->uuid128); 3048 if (uuid_has_bluetooth_prefix(descriptor->uuid128)){ 3049 descriptor->uuid16 = big_endian_read_32(descriptor->uuid128, 0); 3050 } else { 3051 descriptor->uuid16 = 0; 3052 } 3053 } 3054 3055 void gatt_client_send_mtu_negotiation(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3056 gatt_client_t * gatt_client; 3057 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3058 if (status != ERROR_CODE_SUCCESS){ 3059 return; 3060 } 3061 if (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED){ 3062 gatt_client->callback = callback; 3063 gatt_client->mtu_state = SEND_MTU_EXCHANGE; 3064 gatt_client_run(); 3065 } 3066 } 3067 3068 uint8_t gatt_client_request_to_write_without_response(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 3069 gatt_client_t * gatt_client; 3070 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3071 if (status != ERROR_CODE_SUCCESS){ 3072 return status; 3073 } 3074 bool added = btstack_linked_list_add_tail(&gatt_client->write_without_response_requests, (btstack_linked_item_t*) callback_registration); 3075 if (added == false){ 3076 return ERROR_CODE_COMMAND_DISALLOWED; 3077 } else { 3078 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 3079 return ERROR_CODE_SUCCESS; 3080 } 3081 } 3082 3083 uint8_t gatt_client_request_to_send_gatt_query(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 3084 gatt_client_t * gatt_client; 3085 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3086 if (status != ERROR_CODE_SUCCESS){ 3087 return status; 3088 } 3089 bool added = btstack_linked_list_add_tail(&gatt_client->query_requests, (btstack_linked_item_t*) callback_registration); 3090 if (added == false){ 3091 return ERROR_CODE_COMMAND_DISALLOWED; 3092 } else { 3093 gatt_client_notify_can_send_query(gatt_client); 3094 return ERROR_CODE_SUCCESS; 3095 } 3096 } 3097 3098 uint8_t gatt_client_remove_gatt_query(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 3099 gatt_client_t * gatt_client; 3100 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3101 if (status != ERROR_CODE_SUCCESS){ 3102 return status; 3103 } 3104 (void)btstack_linked_list_remove(&gatt_client->query_requests, (btstack_linked_item_t*) callback_registration); 3105 return ERROR_CODE_SUCCESS; 3106 } 3107 3108 uint8_t gatt_client_request_can_write_without_response_event(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3109 gatt_client_t * gatt_client; 3110 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3111 if (status != ERROR_CODE_SUCCESS){ 3112 return status; 3113 } 3114 if (gatt_client->write_without_response_callback != NULL){ 3115 return GATT_CLIENT_IN_WRONG_STATE; 3116 } 3117 gatt_client->write_without_response_callback = callback; 3118 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 3119 return ERROR_CODE_SUCCESS; 3120 } 3121 3122 #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED 3123 void gatt_client_add_service_changed_handler(btstack_packet_callback_registration_t * callback) { 3124 btstack_linked_list_add_tail(&gatt_client_service_changed_handler, (btstack_linked_item_t*) callback); 3125 } 3126 3127 void gatt_client_remove_service_changed_handler(btstack_packet_callback_registration_t * callback){ 3128 btstack_linked_list_remove(&gatt_client_service_changed_handler, (btstack_linked_item_t*) callback); 3129 } 3130 #endif 3131 3132 #if defined(ENABLE_GATT_OVER_CLASSIC) || defined(ENABLE_GATT_OVER_EATT) 3133 3134 #include "hci_event.h" 3135 3136 static const hci_event_t gatt_client_connected = { 3137 GATT_EVENT_CONNECTED, 0, "11BH" 3138 }; 3139 3140 static const hci_event_t gatt_client_disconnected = { 3141 GATT_EVENT_DISCONNECTED, 0, "H" 3142 }; 3143 3144 static void 3145 gatt_client_emit_connected(btstack_packet_handler_t callback, uint8_t status, bd_addr_type_t addr_type, bd_addr_t addr, 3146 hci_con_handle_t con_handle) { 3147 uint8_t buffer[20]; 3148 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_connected, status, addr, con_handle); 3149 (*callback)(HCI_EVENT_PACKET, 0, buffer, len); 3150 } 3151 3152 #endif 3153 3154 #ifdef ENABLE_GATT_OVER_CLASSIC 3155 3156 #include "bluetooth_psm.h" 3157 3158 // single active SDP query 3159 static gatt_client_t * gatt_client_classic_active_sdp_query; 3160 3161 // macos protocol descriptor list requires 16 bytes 3162 static uint8_t gatt_client_classic_sdp_buffer[32]; 3163 3164 3165 static gatt_client_t * gatt_client_get_context_for_classic_addr(bd_addr_t addr){ 3166 btstack_linked_item_t *it; 3167 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 3168 gatt_client_t * gatt_client = (gatt_client_t *) it; 3169 if (memcmp(gatt_client->addr, addr, 6) == 0){ 3170 return gatt_client; 3171 } 3172 } 3173 return NULL; 3174 } 3175 3176 static gatt_client_t * gatt_client_get_context_for_l2cap_cid(uint16_t l2cap_cid){ 3177 btstack_linked_item_t *it; 3178 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 3179 gatt_client_t * gatt_client = (gatt_client_t *) it; 3180 if (gatt_client->l2cap_cid == l2cap_cid){ 3181 return gatt_client; 3182 } 3183 } 3184 return NULL; 3185 } 3186 3187 static void gatt_client_classic_handle_connected(gatt_client_t * gatt_client, uint8_t status){ 3188 // cache peer information 3189 bd_addr_t addr; 3190 // cppcheck-suppress uninitvar ; addr is reported as uninitialized although it's the destination of the memcpy 3191 memcpy(addr, gatt_client->addr, 6); 3192 bd_addr_type_t addr_type = gatt_client->addr_type; 3193 gatt_client->addr_type = BD_ADDR_TYPE_ACL; 3194 hci_con_handle_t con_handle = gatt_client->con_handle; 3195 btstack_packet_handler_t callback = gatt_client->callback; 3196 3197 if (status != ERROR_CODE_SUCCESS){ 3198 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 3199 btstack_memory_gatt_client_free(gatt_client); 3200 } 3201 3202 gatt_client_emit_connected(callback, status, addr_type, addr, con_handle); 3203 } 3204 3205 static void gatt_client_classic_retry(btstack_timer_source_t * ts){ 3206 gatt_client_t * gatt_client = gatt_client_for_timer(ts); 3207 if (gatt_client != NULL){ 3208 gatt_client->state = P_W4_L2CAP_CONNECTION; 3209 att_dispatch_classic_connect(gatt_client->addr, gatt_client->l2cap_psm, &gatt_client->l2cap_cid); 3210 } 3211 } 3212 3213 static void gatt_client_classic_handle_disconnected(gatt_client_t * gatt_client){ 3214 3215 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 3216 gatt_client_timeout_stop(gatt_client); 3217 3218 hci_con_handle_t con_handle = gatt_client->con_handle; 3219 btstack_packet_handler_t callback = gatt_client->callback; 3220 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 3221 btstack_memory_gatt_client_free(gatt_client); 3222 3223 uint8_t buffer[20]; 3224 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_disconnected, con_handle); 3225 (*callback)(HCI_EVENT_PACKET, 0, buffer, len); 3226 } 3227 3228 static void gatt_client_handle_sdp_client_query_attribute_value(gatt_client_t * connection, uint8_t *packet){ 3229 des_iterator_t des_list_it; 3230 des_iterator_t prot_it; 3231 3232 if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= sizeof(gatt_client_classic_sdp_buffer)) { 3233 gatt_client_classic_sdp_buffer[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); 3234 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)) { 3235 switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) { 3236 case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST: 3237 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)) { 3238 uint8_t *des_element; 3239 uint8_t *element; 3240 uint32_t uuid; 3241 3242 if (des_iterator_get_type(&des_list_it) != DE_DES) continue; 3243 3244 des_element = des_iterator_get_element(&des_list_it); 3245 des_iterator_init(&prot_it, des_element); 3246 element = des_iterator_get_element(&prot_it); 3247 3248 if (de_get_element_type(element) != DE_UUID) continue; 3249 3250 uuid = de_get_uuid32(element); 3251 des_iterator_next(&prot_it); 3252 // we assume that the even if there are both roles supported, remote device uses the same psm and avdtp version for both 3253 switch (uuid){ 3254 case BLUETOOTH_PROTOCOL_L2CAP: 3255 if (!des_iterator_has_more(&prot_it)) continue; 3256 de_element_get_uint16(des_iterator_get_element(&prot_it), &connection->l2cap_psm); 3257 break; 3258 default: 3259 break; 3260 } 3261 } 3262 break; 3263 3264 default: 3265 break; 3266 } 3267 } 3268 } 3269 } 3270 3271 static void gatt_client_classic_sdp_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 3272 gatt_client_t * gatt_client = gatt_client_classic_active_sdp_query; 3273 btstack_assert(gatt_client != NULL); 3274 uint8_t status; 3275 3276 // TODO: handle sdp events, get l2cap psm 3277 switch (hci_event_packet_get_type(packet)){ 3278 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: 3279 gatt_client_handle_sdp_client_query_attribute_value(gatt_client, packet); 3280 // TODO: 3281 return; 3282 case SDP_EVENT_QUERY_COMPLETE: 3283 status = sdp_event_query_complete_get_status(packet); 3284 gatt_client_classic_active_sdp_query = NULL; 3285 log_info("l2cap psm: %0x, status %02x", gatt_client->l2cap_psm, status); 3286 if (status != ERROR_CODE_SUCCESS) break; 3287 if (gatt_client->l2cap_psm == 0) { 3288 status = SDP_SERVICE_NOT_FOUND; 3289 break; 3290 } 3291 break; 3292 default: 3293 btstack_assert(false); 3294 return; 3295 } 3296 3297 // done 3298 if (status == ERROR_CODE_SUCCESS){ 3299 gatt_client->state = P_W4_L2CAP_CONNECTION; 3300 status = att_dispatch_classic_connect(gatt_client->addr, gatt_client->l2cap_psm, &gatt_client->l2cap_cid); 3301 } 3302 if (status != ERROR_CODE_SUCCESS) { 3303 gatt_client_classic_handle_connected(gatt_client, status); 3304 } 3305 } 3306 3307 static void gatt_client_classic_sdp_start(void * context){ 3308 gatt_client_classic_active_sdp_query = (gatt_client_t *) context; 3309 gatt_client_classic_active_sdp_query->state = P_W4_SDP_QUERY; 3310 sdp_client_query_uuid16(gatt_client_classic_sdp_handler, gatt_client_classic_active_sdp_query->addr, ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 3311 } 3312 3313 static void gatt_client_classic_emit_connected(void * context){ 3314 gatt_client_t * gatt_client = (gatt_client_t *) context; 3315 gatt_client->state = P_READY; 3316 gatt_client_emit_connected(gatt_client->callback, ERROR_CODE_SUCCESS, gatt_client->addr_type, gatt_client->addr, gatt_client->con_handle); 3317 } 3318 3319 uint8_t gatt_client_classic_connect(btstack_packet_handler_t callback, bd_addr_t addr){ 3320 gatt_client_t * gatt_client = gatt_client_get_context_for_classic_addr(addr); 3321 if (gatt_client != NULL){ 3322 return ERROR_CODE_ACL_CONNECTION_ALREADY_EXISTS; 3323 } 3324 gatt_client = btstack_memory_gatt_client_get(); 3325 if (gatt_client == NULL){ 3326 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 3327 } 3328 // init state 3329 gatt_client->bearer_type = ATT_BEARER_UNENHANCED_CLASSIC; 3330 gatt_client->con_handle = HCI_CON_HANDLE_INVALID; 3331 memcpy(gatt_client->addr, addr, 6); 3332 gatt_client->addr_type = BD_ADDR_TYPE_ACL; 3333 gatt_client->mtu = ATT_DEFAULT_MTU; 3334 gatt_client->security_level = LEVEL_0; 3335 gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 3336 gatt_client->callback = callback; 3337 #ifdef ENABLE_GATT_OVER_EATT 3338 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3339 #endif 3340 btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); 3341 3342 // schedule emitted event if already connected, otherwise 3343 bool already_connected = false; 3344 hci_connection_t * hci_connection = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL); 3345 if (hci_connection != NULL){ 3346 if (hci_connection->att_server.l2cap_cid != 0){ 3347 already_connected = true; 3348 } 3349 } 3350 gatt_client->callback_request.context = gatt_client; 3351 if (already_connected){ 3352 gatt_client->con_handle = hci_connection->con_handle; 3353 gatt_client->callback_request.callback = &gatt_client_classic_emit_connected; 3354 gatt_client->state = P_W2_EMIT_CONNECTED; 3355 btstack_run_loop_execute_on_main_thread(&gatt_client->callback_request); 3356 } else { 3357 gatt_client->callback_request.callback = &gatt_client_classic_sdp_start; 3358 gatt_client->state = P_W2_SDP_QUERY; 3359 sdp_client_register_query_callback(&gatt_client->callback_request); 3360 } 3361 return ERROR_CODE_SUCCESS; 3362 } 3363 3364 uint8_t gatt_client_classic_disconnect(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3365 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 3366 if (gatt_client == NULL){ 3367 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 3368 } 3369 gatt_client->callback = callback; 3370 return l2cap_disconnect(gatt_client->l2cap_cid); 3371 } 3372 #endif 3373 3374 #ifdef ENABLE_GATT_OVER_EATT 3375 3376 #define MAX_NR_EATT_CHANNELS 5 3377 3378 static void gatt_client_le_enhanced_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 3379 3380 static uint8_t gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client_t * gatt_client, gatt_client_state_t state){ 3381 uint8_t num_clients = 0; 3382 btstack_linked_list_iterator_t it; 3383 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 3384 while (btstack_linked_list_iterator_has_next(&it)){ 3385 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3386 if (eatt_client->state == state){ 3387 num_clients++; 3388 } 3389 } 3390 return num_clients; 3391 } 3392 3393 static void gatt_client_eatt_finalize(gatt_client_t * gatt_client) { 3394 // free eatt clients 3395 btstack_linked_list_iterator_t it; 3396 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3397 while (btstack_linked_list_iterator_has_next(&it)) { 3398 gatt_client_t *eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3399 btstack_linked_list_iterator_remove(&it); 3400 btstack_memory_gatt_client_free(eatt_client); 3401 } 3402 } 3403 3404 // all channels connected 3405 static void gatt_client_le_enhanced_handle_connected(gatt_client_t * gatt_client, uint8_t status) { 3406 if (status == ERROR_CODE_SUCCESS){ 3407 uint8_t num_ready = gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client, P_READY); 3408 if (num_ready > 0){ 3409 gatt_client->eatt_state = GATT_CLIENT_EATT_READY; 3410 // free unused channels 3411 btstack_linked_list_iterator_t it; 3412 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3413 while (btstack_linked_list_iterator_has_next(&it)) { 3414 gatt_client_t *eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3415 if (eatt_client->state == P_L2CAP_CLOSED){ 3416 btstack_linked_list_iterator_remove(&it); 3417 btstack_memory_gatt_client_free(eatt_client); 3418 } 3419 } 3420 } else { 3421 hci_connection_t * hci_connection = hci_connection_for_handle(gatt_client->con_handle); 3422 btstack_assert(hci_connection != NULL); 3423 if (hci_connection->att_server.incoming_connection_request){ 3424 hci_connection->att_server.incoming_connection_request = false; 3425 log_info("Collision, retry in 100ms"); 3426 gatt_client->state = P_W2_L2CAP_CONNECT; 3427 // set timer for retry 3428 btstack_run_loop_set_timer(&gatt_client->gc_timeout, GATT_CLIENT_COLLISION_BACKOFF_MS); 3429 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_le_enhanced_retry); 3430 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 3431 return; 3432 } else { 3433 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3434 status = ERROR_CODE_CONNECTION_REJECTED_DUE_TO_LIMITED_RESOURCES; 3435 } 3436 } 3437 } else { 3438 gatt_client_eatt_finalize(gatt_client); 3439 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3440 } 3441 3442 gatt_client_emit_connected(gatt_client->callback, status, gatt_client->addr_type, gatt_client->addr, gatt_client->con_handle); 3443 } 3444 3445 // single channel disconnected 3446 static void gatt_client_le_enhanced_handle_ecbm_disconnected(gatt_client_t * gatt_client, gatt_client_t * eatt_client) { 3447 3448 // report error 3449 gatt_client_report_error_if_pending(eatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 3450 3451 // free memory 3452 btstack_linked_list_remove(&gatt_client->eatt_clients, (btstack_linked_item_t *) eatt_client); 3453 btstack_memory_gatt_client_free(eatt_client); 3454 3455 // last channel 3456 if (btstack_linked_list_empty(&gatt_client->eatt_clients)){ 3457 hci_connection_t * hci_connection = hci_connection_for_handle(gatt_client->con_handle); 3458 hci_connection->att_server.eatt_outgoing_active = false; 3459 3460 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY) { 3461 // report disconnected if last channel closed 3462 uint8_t buffer[20]; 3463 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_disconnected, gatt_client->con_handle); 3464 (*gatt_client->callback)(HCI_EVENT_PACKET, 0, buffer, len); 3465 } 3466 } 3467 } 3468 3469 static gatt_client_t * gatt_client_le_enhanced_get_context_for_l2cap_cid(uint16_t l2cap_cid, gatt_client_t ** out_eatt_client){ 3470 btstack_linked_list_iterator_t it; 3471 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3472 while (btstack_linked_list_iterator_has_next(&it)) { 3473 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3474 btstack_linked_list_iterator_t it2; 3475 btstack_linked_list_iterator_init(&it2, &gatt_client->eatt_clients); 3476 while (btstack_linked_list_iterator_has_next(&it2)) { 3477 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it2); 3478 if (eatt_client->l2cap_cid == l2cap_cid){ 3479 *out_eatt_client = eatt_client; 3480 return gatt_client; 3481 } 3482 } 3483 } 3484 return NULL; 3485 } 3486 3487 static void gatt_client_le_enhanced_setup_l2cap_channel(gatt_client_t * gatt_client){ 3488 uint8_t num_channels = gatt_client->eatt_num_clients; 3489 3490 // setup channels 3491 uint16_t buffer_size_per_client = gatt_client->eatt_storage_size / num_channels; 3492 uint16_t max_mtu = (buffer_size_per_client - REPORT_PREBUFFER_HEADER) / 2; 3493 uint8_t * receive_buffers[MAX_NR_EATT_CHANNELS]; 3494 uint16_t new_cids[MAX_NR_EATT_CHANNELS]; 3495 memset(gatt_client->eatt_storage_buffer, 0, gatt_client->eatt_storage_size); 3496 uint8_t i; 3497 for (i=0;i<gatt_client->eatt_num_clients; i++){ 3498 receive_buffers[i] = &gatt_client->eatt_storage_buffer[REPORT_PREBUFFER_HEADER]; 3499 gatt_client->eatt_storage_buffer += REPORT_PREBUFFER_HEADER + max_mtu; 3500 } 3501 3502 log_info("%u EATT clients with receive buffer size %u", gatt_client->eatt_num_clients, buffer_size_per_client); 3503 3504 uint8_t status = l2cap_ecbm_create_channels(&gatt_client_le_enhanced_packet_handler, 3505 gatt_client->con_handle, 3506 gatt_client->security_level, 3507 BLUETOOTH_PSM_EATT, num_channels, 3508 L2CAP_LE_AUTOMATIC_CREDITS, 3509 buffer_size_per_client, 3510 receive_buffers, 3511 new_cids); 3512 3513 if (status == ERROR_CODE_SUCCESS){ 3514 i = 0; 3515 btstack_linked_list_iterator_t it; 3516 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 3517 while (btstack_linked_list_iterator_has_next(&it)) { 3518 gatt_client_t *new_eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3519 3520 // init state with new cid and transmit buffer 3521 new_eatt_client->bearer_type = ATT_BEARER_ENHANCED_LE; 3522 new_eatt_client->con_handle = gatt_client->con_handle; 3523 new_eatt_client->mtu = 64; 3524 new_eatt_client->security_level = LEVEL_0; 3525 new_eatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 3526 new_eatt_client->state = P_W4_L2CAP_CONNECTION; 3527 new_eatt_client->l2cap_cid = new_cids[i]; 3528 new_eatt_client->eatt_storage_buffer = gatt_client->eatt_storage_buffer; 3529 gatt_client->eatt_storage_buffer += max_mtu; 3530 i++; 3531 } 3532 gatt_client->eatt_state = GATT_CLIENT_EATT_L2CAP_SETUP; 3533 } else { 3534 gatt_client_le_enhanced_handle_connected(gatt_client, status); 3535 } 3536 } 3537 3538 static void gatt_client_le_enhanced_retry(btstack_timer_source_t * ts){ 3539 gatt_client_t * gatt_client = gatt_client_for_timer(ts); 3540 if (gatt_client != NULL){ 3541 gatt_client->state = P_W4_L2CAP_CONNECTION; 3542 gatt_client_le_enhanced_setup_l2cap_channel(gatt_client); 3543 } 3544 } 3545 3546 static void gatt_client_le_enhanced_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) { 3547 gatt_client_t *gatt_client; 3548 gatt_client_t *eatt_client; 3549 hci_con_handle_t con_handle; 3550 uint16_t l2cap_cid; 3551 uint8_t status; 3552 gatt_client_characteristic_t characteristic; 3553 gatt_client_service_t service; 3554 switch (packet_type) { 3555 case HCI_EVENT_PACKET: 3556 switch (hci_event_packet_get_type(packet)) { 3557 case GATT_EVENT_SERVICE_QUERY_RESULT: 3558 con_handle = gatt_event_service_query_result_get_handle(packet); 3559 gatt_client = gatt_client_get_context_for_handle(con_handle); 3560 btstack_assert(gatt_client != NULL); 3561 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE); 3562 gatt_event_service_query_result_get_service(packet, &service); 3563 gatt_client->gatt_service_start_group_handle = service.start_group_handle; 3564 gatt_client->gatt_service_end_group_handle = service.end_group_handle; 3565 break; 3566 case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: 3567 con_handle = gatt_event_characteristic_value_query_result_get_handle(packet); 3568 gatt_client = gatt_client_get_context_for_handle(con_handle); 3569 btstack_assert(gatt_client != NULL); 3570 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE); 3571 if (gatt_event_characteristic_value_query_result_get_value_length(packet) >= 1) { 3572 gatt_client->gatt_server_supported_features = gatt_event_characteristic_value_query_result_get_value(packet)[0]; 3573 } 3574 break; 3575 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 3576 con_handle = gatt_event_characteristic_query_result_get_handle(packet); 3577 gatt_client = gatt_client_get_context_for_handle(con_handle); 3578 btstack_assert(gatt_client != NULL); 3579 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE); 3580 gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic); 3581 gatt_client->gatt_client_supported_features_handle = characteristic.value_handle; 3582 break; 3583 case GATT_EVENT_QUERY_COMPLETE: 3584 con_handle = gatt_event_query_complete_get_handle(packet); 3585 gatt_client = gatt_client_get_context_for_handle(con_handle); 3586 btstack_assert(gatt_client != NULL); 3587 switch (gatt_client->eatt_state){ 3588 case GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE: 3589 if (gatt_client->gatt_service_start_group_handle == 0){ 3590 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3591 } else { 3592 gatt_client->eatt_state = GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W2_SEND; 3593 } 3594 break; 3595 case GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE: 3596 if ((gatt_client->gatt_server_supported_features & 1) == 0) { 3597 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3598 } else { 3599 gatt_client->eatt_state = GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W2_SEND; 3600 } 3601 break; 3602 case GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE: 3603 if (gatt_client->gatt_client_supported_features_handle == 0){ 3604 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3605 } else { 3606 gatt_client->eatt_state = GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W2_SEND; 3607 } 3608 break; 3609 case GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W4_DONE: 3610 gatt_client_le_enhanced_setup_l2cap_channel(gatt_client); 3611 break; 3612 default: 3613 break; 3614 } 3615 break; 3616 case L2CAP_EVENT_ECBM_CHANNEL_OPENED: 3617 l2cap_cid = l2cap_event_ecbm_channel_opened_get_local_cid(packet); 3618 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(l2cap_cid, &eatt_client); 3619 3620 btstack_assert(gatt_client != NULL); 3621 btstack_assert(eatt_client != NULL); 3622 btstack_assert(eatt_client->state == P_W4_L2CAP_CONNECTION); 3623 3624 status = l2cap_event_channel_opened_get_status(packet); 3625 if (status == ERROR_CODE_SUCCESS){ 3626 eatt_client->state = P_READY; 3627 eatt_client->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); 3628 } else { 3629 eatt_client->state = P_L2CAP_CLOSED; 3630 } 3631 // connected if opened event for all channels received 3632 if (gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client, P_W4_L2CAP_CONNECTION) == 0){ 3633 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_SUCCESS); 3634 } 3635 break; 3636 case L2CAP_EVENT_CHANNEL_CLOSED: 3637 l2cap_cid = l2cap_event_channel_closed_get_local_cid(packet); 3638 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(l2cap_cid, &eatt_client); 3639 btstack_assert(gatt_client != NULL); 3640 btstack_assert(eatt_client != NULL); 3641 gatt_client_le_enhanced_handle_ecbm_disconnected(gatt_client, eatt_client); 3642 break; 3643 default: 3644 break; 3645 } 3646 break; 3647 case L2CAP_DATA_PACKET: 3648 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(channel, &eatt_client); 3649 btstack_assert(gatt_client != NULL); 3650 btstack_assert(eatt_client != NULL); 3651 gatt_client_handle_att_response(eatt_client, packet, size); 3652 gatt_client_run(); 3653 break; 3654 default: 3655 break; 3656 } 3657 } 3658 3659 static bool gatt_client_le_enhanced_handle_can_send_query(gatt_client_t * gatt_client){ 3660 uint8_t status = ERROR_CODE_SUCCESS; 3661 uint8_t gatt_client_supported_features = 0x06; // eatt + multiple value notifications 3662 switch (gatt_client->eatt_state){ 3663 case GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W2_SEND: 3664 gatt_client->gatt_service_start_group_handle = 0; 3665 gatt_client->eatt_state = GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE; 3666 status = gatt_client_discover_primary_services_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3667 gatt_client->con_handle, 3668 ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 3669 break; 3670 case GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W2_SEND: 3671 gatt_client->gatt_server_supported_features = 0; 3672 gatt_client->eatt_state = GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE; 3673 status = gatt_client_read_value_of_characteristics_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3674 gatt_client->con_handle, 3675 gatt_client->gatt_service_start_group_handle, 3676 gatt_client->gatt_service_end_group_handle, 3677 ORG_BLUETOOTH_CHARACTERISTIC_SERVER_SUPPORTED_FEATURES); 3678 return true; 3679 case GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W2_SEND: 3680 gatt_client->gatt_client_supported_features_handle = 0; 3681 gatt_client->eatt_state = GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE; 3682 status = gatt_client_discover_characteristics_for_handle_range_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3683 gatt_client->con_handle, 3684 gatt_client->gatt_service_start_group_handle, 3685 gatt_client->gatt_service_end_group_handle, 3686 ORG_BLUETOOTH_CHARACTERISTIC_CLIENT_SUPPORTED_FEATURES); 3687 return true; 3688 case GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W2_SEND: 3689 gatt_client->eatt_state = GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W4_DONE; 3690 status = gatt_client_write_value_of_characteristic(&gatt_client_le_enhanced_packet_handler, gatt_client->con_handle, 3691 gatt_client->gatt_client_supported_features_handle, 1, 3692 &gatt_client_supported_features); 3693 return true; 3694 default: 3695 break; 3696 } 3697 btstack_assert(status == ERROR_CODE_SUCCESS); 3698 UNUSED(status); 3699 return false; 3700 } 3701 3702 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) { 3703 gatt_client_t * gatt_client; 3704 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3705 if (status != ERROR_CODE_SUCCESS){ 3706 return status; 3707 } 3708 3709 if (gatt_client->eatt_state != GATT_CLIENT_EATT_IDLE){ 3710 return ERROR_CODE_COMMAND_DISALLOWED; 3711 } 3712 3713 // need one buffer for sending and one for receiving. Receiving includes pre-buffer for reports 3714 uint16_t buffer_size_per_client = storage_size / num_channels; 3715 uint16_t max_mtu = (buffer_size_per_client - REPORT_PREBUFFER_HEADER) / 2; 3716 if (max_mtu < 64) { 3717 return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS; 3718 } 3719 3720 if ((num_channels == 0) || (num_channels > MAX_NR_EATT_CHANNELS)){ 3721 return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS; 3722 } 3723 3724 // create max num_channel eatt clients 3725 uint8_t i; 3726 btstack_linked_list_t eatt_clients = NULL; 3727 for (i=0;i<num_channels;i++) { 3728 gatt_client_t * new_gatt_client = btstack_memory_gatt_client_get(); 3729 if (new_gatt_client == NULL) { 3730 break; 3731 } 3732 btstack_linked_list_add(&eatt_clients, (btstack_linked_item_t*)new_gatt_client); 3733 } 3734 3735 if (i != num_channels){ 3736 while (true){ 3737 gatt_client = (gatt_client_t *) btstack_linked_list_pop(&eatt_clients); 3738 if (gatt_client == NULL) { 3739 break; 3740 } 3741 btstack_memory_gatt_client_free(gatt_client); 3742 } 3743 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 3744 } 3745 3746 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 3747 hci_connection->att_server.eatt_outgoing_active = true; 3748 3749 gatt_client->callback = callback; 3750 gatt_client->eatt_num_clients = num_channels; 3751 gatt_client->eatt_storage_buffer = storage_buffer; 3752 gatt_client->eatt_storage_size = storage_size; 3753 gatt_client->eatt_clients = eatt_clients; 3754 gatt_client->eatt_state = GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W2_SEND; 3755 gatt_client_notify_can_send_query(gatt_client); 3756 3757 return ERROR_CODE_SUCCESS; 3758 } 3759 3760 #endif 3761 3762 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 3763 void gatt_client_att_packet_handler_fuzz(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 3764 gatt_client_att_packet_handler(packet_type, handle, packet, size); 3765 } 3766 3767 uint8_t gatt_client_get_client(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 3768 uint8_t status = gatt_client_provide_context_for_handle(con_handle, out_gatt_client); 3769 return status; 3770 } 3771 #endif 3772