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