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 MATTHIAS 24 * RINGWALD 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 <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "btstack_config.h" 46 47 #include "att_dispatch.h" 48 #include "ad_parser.h" 49 #include "ble/att_db.h" 50 #include "ble/core.h" 51 #include "ble/gatt_client.h" 52 #include "ble/le_device_db.h" 53 #include "ble/sm.h" 54 #include "btstack_debug.h" 55 #include "btstack_event.h" 56 #include "btstack_memory.h" 57 #include "btstack_run_loop.h" 58 #include "btstack_util.h" 59 #include "classic/sdp_util.h" 60 #include "hci.h" 61 #include "hci_cmd.h" 62 #include "hci_dump.h" 63 #include "l2cap.h" 64 65 static btstack_linked_list_t gatt_client_connections; 66 static btstack_linked_list_t gatt_client_value_listeners; 67 static btstack_packet_callback_registration_t hci_event_callback_registration; 68 69 static uint8_t mtu_exchange_enabled; 70 71 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size); 72 static void gatt_client_hci_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 73 static void gatt_client_report_error_if_pending(gatt_client_t *peripheral, uint8_t error_code); 74 75 #ifdef ENABLE_LE_SIGNED_WRITE 76 static void att_signed_write_handle_cmac_result(uint8_t hash[8]); 77 #endif 78 79 static uint16_t peripheral_mtu(gatt_client_t *peripheral){ 80 if (peripheral->mtu > l2cap_max_le_mtu()){ 81 log_error("Peripheral mtu is not initialized"); 82 return l2cap_max_le_mtu(); 83 } 84 return peripheral->mtu; 85 } 86 87 void gatt_client_init(void){ 88 gatt_client_connections = NULL; 89 mtu_exchange_enabled = 1; 90 // regsister for HCI Events 91 hci_event_callback_registration.callback = &gatt_client_hci_event_packet_handler; 92 hci_add_event_handler(&hci_event_callback_registration); 93 94 // and ATT Client PDUs 95 att_dispatch_register_client(gatt_client_att_packet_handler); 96 } 97 98 static gatt_client_t * gatt_client_for_timer(btstack_timer_source_t * ts){ 99 btstack_linked_list_iterator_t it; 100 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 101 while (btstack_linked_list_iterator_has_next(&it)){ 102 gatt_client_t * peripheral = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 103 if ( &peripheral->gc_timeout == ts) { 104 return peripheral; 105 } 106 } 107 return NULL; 108 } 109 110 static void gatt_client_timeout_handler(btstack_timer_source_t * timer){ 111 gatt_client_t * peripheral = gatt_client_for_timer(timer); 112 if (!peripheral) return; 113 log_info("GATT client timeout handle, handle 0x%02x", peripheral->con_handle); 114 gatt_client_report_error_if_pending(peripheral, ATT_ERROR_TIMEOUT); 115 } 116 117 static void gatt_client_timeout_start(gatt_client_t * peripheral){ 118 log_info("GATT client timeout start, handle 0x%02x", peripheral->con_handle); 119 btstack_run_loop_remove_timer(&peripheral->gc_timeout); 120 btstack_run_loop_set_timer_handler(&peripheral->gc_timeout, gatt_client_timeout_handler); 121 btstack_run_loop_set_timer(&peripheral->gc_timeout, 30000); // 30 seconds sm timeout 122 btstack_run_loop_add_timer(&peripheral->gc_timeout); 123 } 124 125 static void gatt_client_timeout_stop(gatt_client_t * peripheral){ 126 log_info("GATT client timeout stop, handle 0x%02x", peripheral->con_handle); 127 btstack_run_loop_remove_timer(&peripheral->gc_timeout); 128 } 129 130 static gatt_client_t * get_gatt_client_context_for_handle(uint16_t handle){ 131 btstack_linked_item_t *it; 132 for (it = (btstack_linked_item_t *) gatt_client_connections; it ; it = it->next){ 133 gatt_client_t * peripheral = (gatt_client_t *) it; 134 if (peripheral->con_handle == handle){ 135 return peripheral; 136 } 137 } 138 return NULL; 139 } 140 141 142 // @returns context 143 // returns existing one, or tries to setup new one 144 static gatt_client_t * provide_context_for_conn_handle(hci_con_handle_t con_handle){ 145 gatt_client_t * context = get_gatt_client_context_for_handle(con_handle); 146 if (context) return context; 147 148 context = btstack_memory_gatt_client_get(); 149 if (!context) return NULL; 150 // init state 151 memset(context, 0, sizeof(gatt_client_t)); 152 context->con_handle = con_handle; 153 context->mtu = ATT_DEFAULT_MTU; 154 if (mtu_exchange_enabled){ 155 context->mtu_state = SEND_MTU_EXCHANGE; 156 } else { 157 context->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 158 } 159 context->gatt_client_state = P_READY; 160 btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)context); 161 return context; 162 } 163 164 static gatt_client_t * provide_context_for_conn_handle_and_start_timer(hci_con_handle_t con_handle){ 165 gatt_client_t * context = provide_context_for_conn_handle(con_handle); 166 if (!context) return NULL; 167 gatt_client_timeout_start(context); 168 return context; 169 } 170 171 static int is_ready(gatt_client_t * context){ 172 return context->gatt_client_state == P_READY; 173 } 174 175 int gatt_client_is_ready(hci_con_handle_t con_handle){ 176 gatt_client_t * context = provide_context_for_conn_handle(con_handle); 177 if (!context) return 0; 178 return is_ready(context); 179 } 180 181 void gatt_client_mtu_enable_auto_negotiation(uint8_t enabled){ 182 mtu_exchange_enabled = enabled; 183 } 184 185 uint8_t gatt_client_get_mtu(hci_con_handle_t con_handle, uint16_t * mtu){ 186 gatt_client_t * context = provide_context_for_conn_handle(con_handle); 187 if (context && (context->mtu_state == MTU_EXCHANGED || context->mtu_state == MTU_AUTO_EXCHANGE_DISABLED)){ 188 *mtu = context->mtu; 189 return 0; 190 } 191 *mtu = ATT_DEFAULT_MTU; 192 return GATT_CLIENT_IN_WRONG_STATE; 193 } 194 195 // precondition: can_send_packet_now == TRUE 196 static void att_confirmation(uint16_t peripheral_handle){ 197 l2cap_reserve_packet_buffer(); 198 uint8_t * request = l2cap_get_outgoing_buffer(); 199 request[0] = ATT_HANDLE_VALUE_CONFIRMATION; 200 l2cap_send_prepared_connectionless(peripheral_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 1); 201 } 202 203 // precondition: can_send_packet_now == TRUE 204 static void att_find_information_request(uint16_t request_type, uint16_t peripheral_handle, uint16_t start_handle, uint16_t end_handle){ 205 l2cap_reserve_packet_buffer(); 206 uint8_t * request = l2cap_get_outgoing_buffer(); 207 request[0] = request_type; 208 little_endian_store_16(request, 1, start_handle); 209 little_endian_store_16(request, 3, end_handle); 210 211 l2cap_send_prepared_connectionless(peripheral_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 5); 212 } 213 214 // precondition: can_send_packet_now == TRUE 215 static void att_find_by_type_value_request(uint16_t request_type, uint16_t attribute_group_type, uint16_t peripheral_handle, uint16_t start_handle, uint16_t end_handle, uint8_t * value, uint16_t value_size){ 216 l2cap_reserve_packet_buffer(); 217 uint8_t * request = l2cap_get_outgoing_buffer(); 218 219 request[0] = request_type; 220 little_endian_store_16(request, 1, start_handle); 221 little_endian_store_16(request, 3, end_handle); 222 little_endian_store_16(request, 5, attribute_group_type); 223 memcpy(&request[7], value, value_size); 224 225 l2cap_send_prepared_connectionless(peripheral_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 7+value_size); 226 } 227 228 // precondition: can_send_packet_now == TRUE 229 static void att_read_by_type_or_group_request_for_uuid16(uint16_t request_type, uint16_t uuid16, uint16_t peripheral_handle, uint16_t start_handle, uint16_t end_handle){ 230 l2cap_reserve_packet_buffer(); 231 uint8_t * request = l2cap_get_outgoing_buffer(); 232 request[0] = request_type; 233 little_endian_store_16(request, 1, start_handle); 234 little_endian_store_16(request, 3, end_handle); 235 little_endian_store_16(request, 5, uuid16); 236 237 l2cap_send_prepared_connectionless(peripheral_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 7); 238 } 239 240 // precondition: can_send_packet_now == TRUE 241 static void att_read_by_type_or_group_request_for_uuid128(uint16_t request_type, uint8_t * uuid128, uint16_t peripheral_handle, uint16_t start_handle, uint16_t end_handle){ 242 l2cap_reserve_packet_buffer(); 243 uint8_t * request = l2cap_get_outgoing_buffer(); 244 request[0] = request_type; 245 little_endian_store_16(request, 1, start_handle); 246 little_endian_store_16(request, 3, end_handle); 247 reverse_128(uuid128, &request[5]); 248 249 l2cap_send_prepared_connectionless(peripheral_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 21); 250 } 251 252 // precondition: can_send_packet_now == TRUE 253 static void att_read_request(uint16_t request_type, uint16_t peripheral_handle, uint16_t attribute_handle){ 254 l2cap_reserve_packet_buffer(); 255 uint8_t * request = l2cap_get_outgoing_buffer(); 256 request[0] = request_type; 257 little_endian_store_16(request, 1, attribute_handle); 258 259 l2cap_send_prepared_connectionless(peripheral_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 3); 260 } 261 262 // precondition: can_send_packet_now == TRUE 263 static void att_read_blob_request(uint16_t request_type, uint16_t peripheral_handle, uint16_t attribute_handle, uint16_t value_offset){ 264 l2cap_reserve_packet_buffer(); 265 uint8_t * request = l2cap_get_outgoing_buffer(); 266 request[0] = request_type; 267 little_endian_store_16(request, 1, attribute_handle); 268 little_endian_store_16(request, 3, value_offset); 269 270 l2cap_send_prepared_connectionless(peripheral_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 5); 271 } 272 273 static void att_read_multiple_request(uint16_t peripheral_handle, uint16_t num_value_handles, uint16_t * value_handles){ 274 l2cap_reserve_packet_buffer(); 275 uint8_t * request = l2cap_get_outgoing_buffer(); 276 request[0] = ATT_READ_MULTIPLE_REQUEST; 277 int i; 278 int offset = 1; 279 for (i=0;i<num_value_handles;i++){ 280 little_endian_store_16(request, offset, value_handles[i]); 281 offset += 2; 282 } 283 l2cap_send_prepared_connectionless(peripheral_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, offset); 284 } 285 286 #ifdef ENABLE_LE_SIGNED_WRITE 287 // precondition: can_send_packet_now == TRUE 288 static void att_signed_write_request(uint16_t request_type, uint16_t peripheral_handle, uint16_t attribute_handle, uint16_t value_length, uint8_t * value, uint32_t sign_counter, uint8_t sgn[8]){ 289 l2cap_reserve_packet_buffer(); 290 uint8_t * request = l2cap_get_outgoing_buffer(); 291 request[0] = request_type; 292 little_endian_store_16(request, 1, attribute_handle); 293 memcpy(&request[3], value, value_length); 294 little_endian_store_32(request, 3 + value_length, sign_counter); 295 reverse_64(sgn, &request[3 + value_length + 4]); 296 l2cap_send_prepared_connectionless(peripheral_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 3 + value_length + 12); 297 } 298 #endif 299 300 // precondition: can_send_packet_now == TRUE 301 static void att_write_request(uint16_t request_type, uint16_t peripheral_handle, uint16_t attribute_handle, uint16_t value_length, uint8_t * value){ 302 l2cap_reserve_packet_buffer(); 303 uint8_t * request = l2cap_get_outgoing_buffer(); 304 request[0] = request_type; 305 little_endian_store_16(request, 1, attribute_handle); 306 memcpy(&request[3], value, value_length); 307 308 l2cap_send_prepared_connectionless(peripheral_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 3 + value_length); 309 } 310 311 // precondition: can_send_packet_now == TRUE 312 static void att_execute_write_request(uint16_t request_type, uint16_t peripheral_handle, uint8_t execute_write){ 313 l2cap_reserve_packet_buffer(); 314 uint8_t * request = l2cap_get_outgoing_buffer(); 315 request[0] = request_type; 316 request[1] = execute_write; 317 l2cap_send_prepared_connectionless(peripheral_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 2); 318 } 319 320 // precondition: can_send_packet_now == TRUE 321 static void att_prepare_write_request(uint16_t request_type, uint16_t peripheral_handle, uint16_t attribute_handle, uint16_t value_offset, uint16_t blob_length, uint8_t * value){ 322 l2cap_reserve_packet_buffer(); 323 uint8_t * request = l2cap_get_outgoing_buffer(); 324 request[0] = request_type; 325 little_endian_store_16(request, 1, attribute_handle); 326 little_endian_store_16(request, 3, value_offset); 327 memcpy(&request[5], &value[value_offset], blob_length); 328 329 l2cap_send_prepared_connectionless(peripheral_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 5+blob_length); 330 } 331 332 static void att_exchange_mtu_request(uint16_t peripheral_handle){ 333 uint16_t mtu = l2cap_max_le_mtu(); 334 l2cap_reserve_packet_buffer(); 335 uint8_t * request = l2cap_get_outgoing_buffer(); 336 request[0] = ATT_EXCHANGE_MTU_REQUEST; 337 little_endian_store_16(request, 1, mtu); 338 l2cap_send_prepared_connectionless(peripheral_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 3); 339 } 340 341 static uint16_t write_blob_length(gatt_client_t * peripheral){ 342 uint16_t max_blob_length = peripheral_mtu(peripheral) - 5; 343 if (peripheral->attribute_offset >= peripheral->attribute_length) { 344 return 0; 345 } 346 uint16_t rest_length = peripheral->attribute_length - peripheral->attribute_offset; 347 if (max_blob_length > rest_length){ 348 return rest_length; 349 } 350 return max_blob_length; 351 } 352 353 static void send_gatt_services_request(gatt_client_t *peripheral){ 354 att_read_by_type_or_group_request_for_uuid16(ATT_READ_BY_GROUP_TYPE_REQUEST, GATT_PRIMARY_SERVICE_UUID, peripheral->con_handle, peripheral->start_group_handle, peripheral->end_group_handle); 355 } 356 357 static void send_gatt_by_uuid_request(gatt_client_t *peripheral, uint16_t attribute_group_type){ 358 if (peripheral->uuid16){ 359 uint8_t uuid16[2]; 360 little_endian_store_16(uuid16, 0, peripheral->uuid16); 361 att_find_by_type_value_request(ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, peripheral->con_handle, peripheral->start_group_handle, peripheral->end_group_handle, uuid16, 2); 362 return; 363 } 364 uint8_t uuid128[16]; 365 reverse_128(peripheral->uuid128, uuid128); 366 att_find_by_type_value_request(ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, peripheral->con_handle, peripheral->start_group_handle, peripheral->end_group_handle, uuid128, 16); 367 } 368 369 static void send_gatt_services_by_uuid_request(gatt_client_t *peripheral){ 370 send_gatt_by_uuid_request(peripheral, GATT_PRIMARY_SERVICE_UUID); 371 } 372 373 static void send_gatt_included_service_uuid_request(gatt_client_t *peripheral){ 374 att_read_request(ATT_READ_REQUEST, peripheral->con_handle, peripheral->query_start_handle); 375 } 376 377 static void send_gatt_included_service_request(gatt_client_t *peripheral){ 378 att_read_by_type_or_group_request_for_uuid16(ATT_READ_BY_TYPE_REQUEST, GATT_INCLUDE_SERVICE_UUID, peripheral->con_handle, peripheral->start_group_handle, peripheral->end_group_handle); 379 } 380 381 static void send_gatt_characteristic_request(gatt_client_t *peripheral){ 382 att_read_by_type_or_group_request_for_uuid16(ATT_READ_BY_TYPE_REQUEST, GATT_CHARACTERISTICS_UUID, peripheral->con_handle, peripheral->start_group_handle, peripheral->end_group_handle); 383 } 384 385 static void send_gatt_characteristic_descriptor_request(gatt_client_t *peripheral){ 386 att_find_information_request(ATT_FIND_INFORMATION_REQUEST, peripheral->con_handle, peripheral->start_group_handle, peripheral->end_group_handle); 387 } 388 389 static void send_gatt_read_characteristic_value_request(gatt_client_t *peripheral){ 390 att_read_request(ATT_READ_REQUEST, peripheral->con_handle, peripheral->attribute_handle); 391 } 392 393 static void send_gatt_read_by_type_request(gatt_client_t * peripheral){ 394 if (peripheral->uuid16){ 395 att_read_by_type_or_group_request_for_uuid16(ATT_READ_BY_TYPE_REQUEST, peripheral->uuid16, peripheral->con_handle, peripheral->start_group_handle, peripheral->end_group_handle); 396 } else { 397 att_read_by_type_or_group_request_for_uuid128(ATT_READ_BY_TYPE_REQUEST, peripheral->uuid128, peripheral->con_handle, peripheral->start_group_handle, peripheral->end_group_handle); 398 } 399 } 400 401 static void send_gatt_read_blob_request(gatt_client_t *peripheral){ 402 att_read_blob_request(ATT_READ_BLOB_REQUEST, peripheral->con_handle, peripheral->attribute_handle, peripheral->attribute_offset); 403 } 404 405 static void send_gatt_read_multiple_request(gatt_client_t * peripheral){ 406 att_read_multiple_request(peripheral->con_handle, peripheral->read_multiple_handle_count, peripheral->read_multiple_handles); 407 } 408 409 static void send_gatt_write_attribute_value_request(gatt_client_t * peripheral){ 410 att_write_request(ATT_WRITE_REQUEST, peripheral->con_handle, peripheral->attribute_handle, peripheral->attribute_length, peripheral->attribute_value); 411 } 412 413 static void send_gatt_write_client_characteristic_configuration_request(gatt_client_t * peripheral){ 414 att_write_request(ATT_WRITE_REQUEST, peripheral->con_handle, peripheral->client_characteristic_configuration_handle, 2, peripheral->client_characteristic_configuration_value); 415 } 416 417 static void send_gatt_prepare_write_request(gatt_client_t * peripheral){ 418 att_prepare_write_request(ATT_PREPARE_WRITE_REQUEST, peripheral->con_handle, peripheral->attribute_handle, peripheral->attribute_offset, write_blob_length(peripheral), peripheral->attribute_value); 419 } 420 421 static void send_gatt_execute_write_request(gatt_client_t * peripheral){ 422 att_execute_write_request(ATT_EXECUTE_WRITE_REQUEST, peripheral->con_handle, 1); 423 } 424 425 static void send_gatt_cancel_prepared_write_request(gatt_client_t * peripheral){ 426 att_execute_write_request(ATT_EXECUTE_WRITE_REQUEST, peripheral->con_handle, 0); 427 } 428 429 static void send_gatt_read_client_characteristic_configuration_request(gatt_client_t * peripheral){ 430 att_read_by_type_or_group_request_for_uuid16(ATT_READ_BY_TYPE_REQUEST, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION, peripheral->con_handle, peripheral->start_group_handle, peripheral->end_group_handle); 431 } 432 433 static void send_gatt_read_characteristic_descriptor_request(gatt_client_t * peripheral){ 434 att_read_request(ATT_READ_REQUEST, peripheral->con_handle, peripheral->attribute_handle); 435 } 436 437 #ifdef ENABLE_LE_SIGNED_WRITE 438 static void send_gatt_signed_write_request(gatt_client_t * peripheral, uint32_t sign_counter){ 439 att_signed_write_request(ATT_SIGNED_WRITE_COMMAND, peripheral->con_handle, peripheral->attribute_handle, peripheral->attribute_length, peripheral->attribute_value, sign_counter, peripheral->cmac); 440 } 441 #endif 442 443 static uint16_t get_last_result_handle_from_service_list(uint8_t * packet, uint16_t size){ 444 uint8_t attr_length = packet[1]; 445 return little_endian_read_16(packet, size - attr_length + 2); 446 } 447 448 static uint16_t get_last_result_handle_from_characteristics_list(uint8_t * packet, uint16_t size){ 449 uint8_t attr_length = packet[1]; 450 return little_endian_read_16(packet, size - attr_length + 3); 451 } 452 453 static uint16_t get_last_result_handle_from_included_services_list(uint8_t * packet, uint16_t size){ 454 uint8_t attr_length = packet[1]; 455 return little_endian_read_16(packet, size - attr_length); 456 } 457 458 static void gatt_client_handle_transaction_complete(gatt_client_t * peripheral){ 459 peripheral->gatt_client_state = P_READY; 460 gatt_client_timeout_stop(peripheral); 461 } 462 463 static void emit_event_new(btstack_packet_handler_t callback, uint8_t * packet, uint16_t size){ 464 if (!callback) return; 465 hci_dump_packet(HCI_EVENT_PACKET, 0, packet, size); 466 (*callback)(HCI_EVENT_PACKET, 0, packet, size); 467 } 468 469 void gatt_client_listen_for_characteristic_value_updates(gatt_client_notification_t * notification, btstack_packet_handler_t packet_handler, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 470 notification->callback = packet_handler; 471 notification->con_handle = con_handle; 472 notification->attribute_handle = characteristic->value_handle; 473 btstack_linked_list_add(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 474 } 475 476 void gatt_client_stop_listening_for_characteristic_value_updates(gatt_client_notification_t * notification){ 477 btstack_linked_list_remove(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 478 } 479 480 static void emit_event_to_registered_listeners(hci_con_handle_t con_handle, uint16_t attribute_handle, uint8_t * packet, uint16_t size){ 481 btstack_linked_list_iterator_t it; 482 btstack_linked_list_iterator_init(&it, &gatt_client_value_listeners); 483 while (btstack_linked_list_iterator_has_next(&it)){ 484 gatt_client_notification_t * notification = (gatt_client_notification_t*) btstack_linked_list_iterator_next(&it); 485 if (notification->con_handle != con_handle) continue; 486 if (notification->attribute_handle != attribute_handle) continue; 487 (*notification->callback)(HCI_EVENT_PACKET, 0, packet, size); 488 } 489 } 490 491 static void emit_gatt_complete_event(gatt_client_t * peripheral, uint8_t status){ 492 // @format H1 493 uint8_t packet[5]; 494 packet[0] = GATT_EVENT_QUERY_COMPLETE; 495 packet[1] = 3; 496 little_endian_store_16(packet, 2, peripheral->con_handle); 497 packet[4] = status; 498 emit_event_new(peripheral->callback, packet, sizeof(packet)); 499 } 500 501 static void emit_gatt_service_query_result_event(gatt_client_t * peripheral, uint16_t start_group_handle, uint16_t end_group_handle, uint8_t * uuid128){ 502 // @format HX 503 uint8_t packet[24]; 504 packet[0] = GATT_EVENT_SERVICE_QUERY_RESULT; 505 packet[1] = sizeof(packet) - 2; 506 little_endian_store_16(packet, 2, peripheral->con_handle); 507 /// 508 little_endian_store_16(packet, 4, start_group_handle); 509 little_endian_store_16(packet, 6, end_group_handle); 510 reverse_128(uuid128, &packet[8]); 511 emit_event_new(peripheral->callback, packet, sizeof(packet)); 512 } 513 514 static void emit_gatt_included_service_query_result_event(gatt_client_t * peripheral, uint16_t include_handle, uint16_t start_group_handle, uint16_t end_group_handle, uint8_t * uuid128){ 515 // @format HX 516 uint8_t packet[26]; 517 packet[0] = GATT_EVENT_INCLUDED_SERVICE_QUERY_RESULT; 518 packet[1] = sizeof(packet) - 2; 519 little_endian_store_16(packet, 2, peripheral->con_handle); 520 /// 521 little_endian_store_16(packet, 4, include_handle); 522 // 523 little_endian_store_16(packet, 6, start_group_handle); 524 little_endian_store_16(packet, 8, end_group_handle); 525 reverse_128(uuid128, &packet[10]); 526 emit_event_new(peripheral->callback, packet, sizeof(packet)); 527 } 528 529 static void emit_gatt_characteristic_query_result_event(gatt_client_t * peripheral, uint16_t start_handle, uint16_t value_handle, uint16_t end_handle, 530 uint16_t properties, uint8_t * uuid128){ 531 // @format HY 532 uint8_t packet[28]; 533 packet[0] = GATT_EVENT_CHARACTERISTIC_QUERY_RESULT; 534 packet[1] = sizeof(packet) - 2; 535 little_endian_store_16(packet, 2, peripheral->con_handle); 536 /// 537 little_endian_store_16(packet, 4, start_handle); 538 little_endian_store_16(packet, 6, value_handle); 539 little_endian_store_16(packet, 8, end_handle); 540 little_endian_store_16(packet, 10, properties); 541 reverse_128(uuid128, &packet[12]); 542 emit_event_new(peripheral->callback, packet, sizeof(packet)); 543 } 544 545 static void emit_gatt_all_characteristic_descriptors_result_event( 546 gatt_client_t * peripheral, uint16_t descriptor_handle, uint8_t * uuid128){ 547 // @format HZ 548 uint8_t packet[22]; 549 packet[0] = GATT_EVENT_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT; 550 packet[1] = sizeof(packet) - 2; 551 little_endian_store_16(packet, 2, peripheral->con_handle); 552 /// 553 little_endian_store_16(packet, 4, descriptor_handle); 554 reverse_128(uuid128, &packet[6]); 555 emit_event_new(peripheral->callback, packet, sizeof(packet)); 556 } 557 558 static void emit_gatt_mtu_exchanged_result_event(gatt_client_t * peripheral, uint16_t new_mtu){ 559 // @format H2 560 uint8_t packet[6]; 561 packet[0] = GATT_EVENT_MTU; 562 packet[1] = sizeof(packet) - 2; 563 little_endian_store_16(packet, 2, peripheral->con_handle); 564 little_endian_store_16(packet, 4, new_mtu); 565 att_dispatch_client_mtu_exchanged(peripheral->con_handle, new_mtu); 566 emit_event_new(peripheral->callback, packet, sizeof(packet)); 567 } 568 /// 569 static void report_gatt_services(gatt_client_t * peripheral, uint8_t * packet, uint16_t size){ 570 uint8_t attr_length = packet[1]; 571 uint8_t uuid_length = attr_length - 4; 572 573 int i; 574 for (i = 2; i < size; i += attr_length){ 575 uint16_t start_group_handle = little_endian_read_16(packet,i); 576 uint16_t end_group_handle = little_endian_read_16(packet,i+2); 577 uint8_t uuid128[16]; 578 uint16_t uuid16 = 0; 579 580 if (uuid_length == 2){ 581 uuid16 = little_endian_read_16(packet, i+4); 582 uuid_add_bluetooth_prefix((uint8_t*) &uuid128, uuid16); 583 } else { 584 reverse_128(&packet[i+4], uuid128); 585 } 586 emit_gatt_service_query_result_event(peripheral, start_group_handle, end_group_handle, uuid128); 587 } 588 // log_info("report_gatt_services for %02X done", peripheral->con_handle); 589 } 590 591 // helper 592 static void characteristic_start_found(gatt_client_t * peripheral, uint16_t start_handle, uint8_t properties, uint16_t value_handle, uint8_t * uuid, uint16_t uuid_length){ 593 uint8_t uuid128[16]; 594 uint16_t uuid16 = 0; 595 if (uuid_length == 2){ 596 uuid16 = little_endian_read_16(uuid, 0); 597 uuid_add_bluetooth_prefix((uint8_t*) uuid128, uuid16); 598 } else { 599 reverse_128(uuid, uuid128); 600 } 601 602 if (peripheral->filter_with_uuid && memcmp(peripheral->uuid128, uuid128, 16) != 0) return; 603 604 peripheral->characteristic_properties = properties; 605 peripheral->characteristic_start_handle = start_handle; 606 peripheral->attribute_handle = value_handle; 607 608 if (peripheral->filter_with_uuid) return; 609 610 peripheral->uuid16 = uuid16; 611 memcpy(peripheral->uuid128, uuid128, 16); 612 } 613 614 static void characteristic_end_found(gatt_client_t * peripheral, uint16_t end_handle){ 615 // TODO: stop searching if filter and uuid found 616 617 if (!peripheral->characteristic_start_handle) return; 618 619 emit_gatt_characteristic_query_result_event(peripheral, peripheral->characteristic_start_handle, peripheral->attribute_handle, 620 end_handle, peripheral->characteristic_properties, peripheral->uuid128); 621 622 peripheral->characteristic_start_handle = 0; 623 } 624 625 static void report_gatt_characteristics(gatt_client_t * peripheral, uint8_t * packet, uint16_t size){ 626 uint8_t attr_length = packet[1]; 627 uint8_t uuid_length = attr_length - 5; 628 int i; 629 for (i = 2; i < size; i += attr_length){ 630 uint16_t start_handle = little_endian_read_16(packet, i); 631 uint8_t properties = packet[i+2]; 632 uint16_t value_handle = little_endian_read_16(packet, i+3); 633 characteristic_end_found(peripheral, start_handle-1); 634 characteristic_start_found(peripheral, start_handle, properties, value_handle, &packet[i+5], uuid_length); 635 } 636 } 637 638 static void report_gatt_included_service_uuid16(gatt_client_t * peripheral, uint16_t include_handle, uint16_t uuid16){ 639 uint8_t normalized_uuid128[16]; 640 uuid_add_bluetooth_prefix(normalized_uuid128, uuid16); 641 emit_gatt_included_service_query_result_event(peripheral, include_handle, peripheral->query_start_handle, 642 peripheral->query_end_handle, normalized_uuid128); 643 } 644 645 static void report_gatt_included_service_uuid128(gatt_client_t * peripheral, uint16_t include_handle, uint8_t *uuid128){ 646 emit_gatt_included_service_query_result_event(peripheral, include_handle, peripheral->query_start_handle, 647 peripheral->query_end_handle, uuid128); 648 } 649 650 // @returns packet pointer 651 // @note assume that value is part of an l2cap buffer - overwrite HCI + L2CAP packet headers 652 static const int characteristic_value_event_header_size = 8; 653 static uint8_t * setup_characteristic_value_packet(uint8_t type, hci_con_handle_t con_handle, uint16_t attribute_handle, uint8_t * value, uint16_t length){ 654 // before the value inside the ATT PDU 655 uint8_t * packet = value - characteristic_value_event_header_size; 656 packet[0] = type; 657 packet[1] = characteristic_value_event_header_size - 2 + length; 658 little_endian_store_16(packet, 2, con_handle); 659 little_endian_store_16(packet, 4, attribute_handle); 660 little_endian_store_16(packet, 6, length); 661 return packet; 662 } 663 664 // @returns packet pointer 665 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 666 static const int long_characteristic_value_event_header_size = 10; 667 static uint8_t * setup_long_characteristic_value_packet(uint8_t type, hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint8_t * value, uint16_t length){ 668 #if defined(HCI_INCOMING_PRE_BUFFER_SIZE) && (HCI_INCOMING_PRE_BUFFER_SIZE >= 10 - 8) // L2CAP Header (4) - ACL Header (4) 669 // before the value inside the ATT PDU 670 uint8_t * packet = value - long_characteristic_value_event_header_size; 671 packet[0] = type; 672 packet[1] = long_characteristic_value_event_header_size - 2 + length; 673 little_endian_store_16(packet, 2, con_handle); 674 little_endian_store_16(packet, 4, attribute_handle); 675 little_endian_store_16(packet, 6, offset); 676 little_endian_store_16(packet, 8, length); 677 return packet; 678 #else 679 log_error("HCI_INCOMING_PRE_BUFFER_SIZE >= 2 required for long characteristic reads"); 680 return NULL; 681 #endif 682 } 683 684 685 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 686 static void report_gatt_notification(hci_con_handle_t con_handle, uint16_t value_handle, uint8_t * value, int length){ 687 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_NOTIFICATION, con_handle, value_handle, value, length); 688 emit_event_to_registered_listeners(con_handle, value_handle, packet, characteristic_value_event_header_size + length); 689 } 690 691 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 692 static void report_gatt_indication(hci_con_handle_t con_handle, uint16_t value_handle, uint8_t * value, int length){ 693 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_INDICATION, con_handle, value_handle, value, length); 694 emit_event_to_registered_listeners(con_handle, value_handle, packet, characteristic_value_event_header_size + length); 695 } 696 697 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 698 static void report_gatt_characteristic_value(gatt_client_t * peripheral, uint16_t attribute_handle, uint8_t * value, uint16_t length){ 699 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT, peripheral->con_handle, attribute_handle, value, length); 700 emit_event_new(peripheral->callback, packet, characteristic_value_event_header_size + length); 701 } 702 703 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 704 static void report_gatt_long_characteristic_value_blob(gatt_client_t * peripheral, uint16_t attribute_handle, uint8_t * blob, uint16_t blob_length, int value_offset){ 705 uint8_t * packet = setup_long_characteristic_value_packet(GATT_EVENT_LONG_CHARACTERISTIC_VALUE_QUERY_RESULT, peripheral->con_handle, attribute_handle, value_offset, blob, blob_length); 706 if (!packet) return; 707 emit_event_new(peripheral->callback, packet, blob_length + long_characteristic_value_event_header_size); 708 } 709 710 static void report_gatt_characteristic_descriptor(gatt_client_t * peripheral, uint16_t descriptor_handle, uint8_t *value, uint16_t value_length, uint16_t value_offset){ 711 UNUSED(value_offset); 712 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, peripheral->con_handle, descriptor_handle, value, value_length); 713 emit_event_new(peripheral->callback, packet, value_length + 8); 714 } 715 716 static void report_gatt_long_characteristic_descriptor(gatt_client_t * peripheral, uint16_t descriptor_handle, uint8_t *blob, uint16_t blob_length, uint16_t value_offset){ 717 uint8_t * packet = setup_long_characteristic_value_packet(GATT_EVENT_LONG_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, peripheral->con_handle, descriptor_handle, value_offset, blob, blob_length); 718 if (!packet) return; 719 emit_event_new(peripheral->callback, packet, blob_length + long_characteristic_value_event_header_size); 720 } 721 722 static void report_gatt_all_characteristic_descriptors(gatt_client_t * peripheral, uint8_t * packet, uint16_t size, uint16_t pair_size){ 723 int i; 724 for (i = 0; i<size; i+=pair_size){ 725 uint16_t descriptor_handle = little_endian_read_16(packet,i); 726 uint8_t uuid128[16]; 727 uint16_t uuid16 = 0; 728 if (pair_size == 4){ 729 uuid16 = little_endian_read_16(packet,i+2); 730 uuid_add_bluetooth_prefix(uuid128, uuid16); 731 } else { 732 reverse_128(&packet[i+2], uuid128); 733 } 734 emit_gatt_all_characteristic_descriptors_result_event(peripheral, descriptor_handle, uuid128); 735 } 736 737 } 738 739 static int is_query_done(gatt_client_t * peripheral, uint16_t last_result_handle){ 740 return last_result_handle >= peripheral->end_group_handle; 741 } 742 743 static void trigger_next_query(gatt_client_t * peripheral, uint16_t last_result_handle, gatt_client_state_t next_query_state){ 744 if (is_query_done(peripheral, last_result_handle)){ 745 gatt_client_handle_transaction_complete(peripheral); 746 emit_gatt_complete_event(peripheral, 0); 747 return; 748 } 749 // next 750 peripheral->start_group_handle = last_result_handle + 1; 751 peripheral->gatt_client_state = next_query_state; 752 } 753 754 static inline void trigger_next_included_service_query(gatt_client_t * peripheral, uint16_t last_result_handle){ 755 trigger_next_query(peripheral, last_result_handle, P_W2_SEND_INCLUDED_SERVICE_QUERY); 756 } 757 758 static inline void trigger_next_service_query(gatt_client_t * peripheral, uint16_t last_result_handle){ 759 trigger_next_query(peripheral, last_result_handle, P_W2_SEND_SERVICE_QUERY); 760 } 761 762 static inline void trigger_next_service_by_uuid_query(gatt_client_t * peripheral, uint16_t last_result_handle){ 763 trigger_next_query(peripheral, last_result_handle, P_W2_SEND_SERVICE_WITH_UUID_QUERY); 764 } 765 766 static inline void trigger_next_characteristic_query(gatt_client_t * peripheral, uint16_t last_result_handle){ 767 if (is_query_done(peripheral, last_result_handle)){ 768 // report last characteristic 769 characteristic_end_found(peripheral, peripheral->end_group_handle); 770 } 771 trigger_next_query(peripheral, last_result_handle, P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY); 772 } 773 774 static inline void trigger_next_characteristic_descriptor_query(gatt_client_t * peripheral, uint16_t last_result_handle){ 775 trigger_next_query(peripheral, last_result_handle, P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY); 776 } 777 778 static inline void trigger_next_read_by_type_query(gatt_client_t * peripheral, uint16_t last_result_handle){ 779 trigger_next_query(peripheral, last_result_handle, P_W2_SEND_READ_BY_TYPE_REQUEST); 780 } 781 782 static inline void trigger_next_prepare_write_query(gatt_client_t * peripheral, gatt_client_state_t next_query_state, gatt_client_state_t done_state){ 783 peripheral->attribute_offset += write_blob_length(peripheral); 784 uint16_t next_blob_length = write_blob_length(peripheral); 785 786 if (next_blob_length == 0){ 787 peripheral->gatt_client_state = done_state; 788 return; 789 } 790 peripheral->gatt_client_state = next_query_state; 791 } 792 793 static inline void trigger_next_blob_query(gatt_client_t * peripheral, gatt_client_state_t next_query_state, uint16_t received_blob_length){ 794 795 uint16_t max_blob_length = peripheral_mtu(peripheral) - 1; 796 if (received_blob_length < max_blob_length){ 797 gatt_client_handle_transaction_complete(peripheral); 798 emit_gatt_complete_event(peripheral, 0); 799 return; 800 } 801 802 peripheral->attribute_offset += received_blob_length; 803 peripheral->gatt_client_state = next_query_state; 804 } 805 806 807 static int is_value_valid(gatt_client_t *peripheral, uint8_t *packet, uint16_t size){ 808 uint16_t attribute_handle = little_endian_read_16(packet, 1); 809 uint16_t value_offset = little_endian_read_16(packet, 3); 810 811 if (peripheral->attribute_handle != attribute_handle) return 0; 812 if (peripheral->attribute_offset != value_offset) return 0; 813 return memcmp(&peripheral->attribute_value[peripheral->attribute_offset], &packet[5], size-5) == 0; 814 } 815 816 // returns 1 if packet was sent 817 static int gatt_client_run_for_peripheral( gatt_client_t * peripheral){ 818 // log_info("- handle_peripheral_list, mtu state %u, client state %u", peripheral->mtu_state, peripheral->gatt_client_state); 819 820 switch (peripheral->mtu_state) { 821 case SEND_MTU_EXCHANGE: 822 peripheral->mtu_state = SENT_MTU_EXCHANGE; 823 att_exchange_mtu_request(peripheral->con_handle); 824 return 1; 825 case SENT_MTU_EXCHANGE: 826 return 0; 827 default: 828 break; 829 } 830 831 if (peripheral->send_confirmation){ 832 peripheral->send_confirmation = 0; 833 att_confirmation(peripheral->con_handle); 834 return 1; 835 } 836 837 // check MTU for writes 838 switch (peripheral->gatt_client_state){ 839 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 840 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 841 if (peripheral->attribute_length <= peripheral_mtu(peripheral) - 3) break; 842 log_error("gatt_client_run: value len %u > MTU %u - 3\n", peripheral->attribute_length, peripheral_mtu(peripheral)); 843 gatt_client_handle_transaction_complete(peripheral); 844 emit_gatt_complete_event(peripheral, ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH); 845 return 0; 846 default: 847 break; 848 } 849 850 // log_info("gatt_client_state %u", peripheral->gatt_client_state); 851 switch (peripheral->gatt_client_state){ 852 case P_W2_SEND_SERVICE_QUERY: 853 peripheral->gatt_client_state = P_W4_SERVICE_QUERY_RESULT; 854 send_gatt_services_request(peripheral); 855 return 1; 856 857 case P_W2_SEND_SERVICE_WITH_UUID_QUERY: 858 peripheral->gatt_client_state = P_W4_SERVICE_WITH_UUID_RESULT; 859 send_gatt_services_by_uuid_request(peripheral); 860 return 1; 861 862 case P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY: 863 peripheral->gatt_client_state = P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT; 864 send_gatt_characteristic_request(peripheral); 865 return 1; 866 867 case P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY: 868 peripheral->gatt_client_state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 869 send_gatt_characteristic_request(peripheral); 870 return 1; 871 872 case P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY: 873 peripheral->gatt_client_state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 874 send_gatt_characteristic_descriptor_request(peripheral); 875 return 1; 876 877 case P_W2_SEND_INCLUDED_SERVICE_QUERY: 878 peripheral->gatt_client_state = P_W4_INCLUDED_SERVICE_QUERY_RESULT; 879 send_gatt_included_service_request(peripheral); 880 return 1; 881 882 case P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY: 883 peripheral->gatt_client_state = P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT; 884 send_gatt_included_service_uuid_request(peripheral); 885 return 1; 886 887 case P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY: 888 peripheral->gatt_client_state = P_W4_READ_CHARACTERISTIC_VALUE_RESULT; 889 send_gatt_read_characteristic_value_request(peripheral); 890 return 1; 891 892 case P_W2_SEND_READ_BLOB_QUERY: 893 peripheral->gatt_client_state = P_W4_READ_BLOB_RESULT; 894 send_gatt_read_blob_request(peripheral); 895 return 1; 896 897 case P_W2_SEND_READ_BY_TYPE_REQUEST: 898 peripheral->gatt_client_state = P_W4_READ_BY_TYPE_RESPONSE; 899 send_gatt_read_by_type_request(peripheral); 900 return 1; 901 902 case P_W2_SEND_READ_MULTIPLE_REQUEST: 903 peripheral->gatt_client_state = P_W4_READ_MULTIPLE_RESPONSE; 904 send_gatt_read_multiple_request(peripheral); 905 return 1; 906 907 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 908 peripheral->gatt_client_state = P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT; 909 send_gatt_write_attribute_value_request(peripheral); 910 return 1; 911 912 case P_W2_PREPARE_WRITE: 913 peripheral->gatt_client_state = P_W4_PREPARE_WRITE_RESULT; 914 send_gatt_prepare_write_request(peripheral); 915 return 1; 916 917 case P_W2_PREPARE_WRITE_SINGLE: 918 peripheral->gatt_client_state = P_W4_PREPARE_WRITE_SINGLE_RESULT; 919 send_gatt_prepare_write_request(peripheral); 920 return 1; 921 922 case P_W2_PREPARE_RELIABLE_WRITE: 923 peripheral->gatt_client_state = P_W4_PREPARE_RELIABLE_WRITE_RESULT; 924 send_gatt_prepare_write_request(peripheral); 925 return 1; 926 927 case P_W2_EXECUTE_PREPARED_WRITE: 928 peripheral->gatt_client_state = P_W4_EXECUTE_PREPARED_WRITE_RESULT; 929 send_gatt_execute_write_request(peripheral); 930 return 1; 931 932 case P_W2_CANCEL_PREPARED_WRITE: 933 peripheral->gatt_client_state = P_W4_CANCEL_PREPARED_WRITE_RESULT; 934 send_gatt_cancel_prepared_write_request(peripheral); 935 return 1; 936 937 case P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH: 938 peripheral->gatt_client_state = P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT; 939 send_gatt_cancel_prepared_write_request(peripheral); 940 return 1; 941 942 case P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 943 peripheral->gatt_client_state = P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 944 send_gatt_read_client_characteristic_configuration_request(peripheral); 945 return 1; 946 947 case P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY: 948 peripheral->gatt_client_state = P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT; 949 send_gatt_read_characteristic_descriptor_request(peripheral); 950 return 1; 951 952 case P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY: 953 peripheral->gatt_client_state = P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT; 954 send_gatt_read_blob_request(peripheral); 955 return 1; 956 957 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 958 peripheral->gatt_client_state = P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 959 send_gatt_write_attribute_value_request(peripheral); 960 return 1; 961 962 case P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION: 963 peripheral->gatt_client_state = P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT; 964 send_gatt_write_client_characteristic_configuration_request(peripheral); 965 return 1; 966 967 case P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR: 968 peripheral->gatt_client_state = P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 969 send_gatt_prepare_write_request(peripheral); 970 return 1; 971 972 case P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR: 973 peripheral->gatt_client_state = P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 974 send_gatt_execute_write_request(peripheral); 975 return 1; 976 977 #ifdef ENABLE_LE_SIGNED_WRITE 978 case P_W4_CMAC_READY: 979 if (sm_cmac_ready()){ 980 sm_key_t csrk; 981 le_device_db_local_csrk_get(peripheral->le_device_index, csrk); 982 uint32_t sign_counter = le_device_db_local_counter_get(peripheral->le_device_index); 983 peripheral->gatt_client_state = P_W4_CMAC_RESULT; 984 sm_cmac_signed_write_start(csrk, ATT_SIGNED_WRITE_COMMAND, peripheral->attribute_handle, peripheral->attribute_length, peripheral->attribute_value, sign_counter, att_signed_write_handle_cmac_result); 985 } 986 return 0; 987 988 case P_W2_SEND_SIGNED_WRITE: { 989 peripheral->gatt_client_state = P_W4_SEND_SINGED_WRITE_DONE; 990 // bump local signing counter 991 uint32_t sign_counter = le_device_db_local_counter_get(peripheral->le_device_index); 992 le_device_db_local_counter_set(peripheral->le_device_index, sign_counter + 1); 993 994 send_gatt_signed_write_request(peripheral, sign_counter); 995 peripheral->gatt_client_state = P_READY; 996 // finally, notifiy client that write is complete 997 gatt_client_handle_transaction_complete(peripheral); 998 return 1; 999 } 1000 #endif 1001 1002 default: 1003 break; 1004 } 1005 return 0; 1006 } 1007 1008 static void gatt_client_run(void){ 1009 btstack_linked_item_t *it; 1010 for (it = (btstack_linked_item_t *) gatt_client_connections; it ; it = it->next){ 1011 gatt_client_t * peripheral = (gatt_client_t *) it; 1012 if (!att_dispatch_client_can_send_now(peripheral->con_handle)) { 1013 att_dispatch_client_request_can_send_now_event(peripheral->con_handle); 1014 return; 1015 } 1016 int packet_sent = gatt_client_run_for_peripheral(peripheral); 1017 if (packet_sent){ 1018 // request new permission 1019 att_dispatch_client_request_can_send_now_event(peripheral->con_handle); 1020 // requeue client for fairness and exit 1021 // note: iterator has become invalid 1022 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) peripheral); 1023 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) peripheral); 1024 return; 1025 } 1026 } 1027 } 1028 1029 static void gatt_client_report_error_if_pending(gatt_client_t *peripheral, uint8_t error_code) { 1030 if (is_ready(peripheral)) return; 1031 gatt_client_handle_transaction_complete(peripheral); 1032 emit_gatt_complete_event(peripheral, error_code); 1033 } 1034 1035 static void gatt_client_hci_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1036 UNUSED(channel); // ok: handling own l2cap events 1037 UNUSED(size); // ok: there is no channel 1038 1039 if (packet_type != HCI_EVENT_PACKET) return; 1040 1041 switch (hci_event_packet_get_type(packet)) { 1042 case HCI_EVENT_DISCONNECTION_COMPLETE: 1043 { 1044 log_info("GATT Client: HCI_EVENT_DISCONNECTION_COMPLETE"); 1045 hci_con_handle_t con_handle = little_endian_read_16(packet,3); 1046 gatt_client_t * peripheral = get_gatt_client_context_for_handle(con_handle); 1047 if (!peripheral) break; 1048 gatt_client_report_error_if_pending(peripheral, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 1049 1050 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) peripheral); 1051 btstack_memory_gatt_client_free(peripheral); 1052 break; 1053 } 1054 default: 1055 break; 1056 } 1057 1058 gatt_client_run(); 1059 } 1060 1061 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 1062 1063 if (packet_type == HCI_EVENT_PACKET && packet[0] == L2CAP_EVENT_CAN_SEND_NOW){ 1064 gatt_client_run(); 1065 } 1066 1067 if (packet_type != ATT_DATA_PACKET) return; 1068 1069 // special cases: notifications don't need a context while indications motivate creating one 1070 gatt_client_t * peripheral; 1071 switch (packet[0]){ 1072 case ATT_HANDLE_VALUE_NOTIFICATION: 1073 report_gatt_notification(handle, little_endian_read_16(packet,1), &packet[3], size-3); 1074 return; 1075 case ATT_HANDLE_VALUE_INDICATION: 1076 peripheral = provide_context_for_conn_handle(handle); 1077 break; 1078 default: 1079 peripheral = get_gatt_client_context_for_handle(handle); 1080 break; 1081 } 1082 1083 if (!peripheral) return; 1084 1085 switch (packet[0]){ 1086 // att_server has negotiated the mtu for this connection 1087 case ATT_EVENT_MTU_EXCHANGE_COMPLETE: 1088 { 1089 peripheral->mtu = little_endian_read_16(packet, 4); 1090 break; 1091 } 1092 case ATT_EXCHANGE_MTU_RESPONSE: 1093 { 1094 uint16_t remote_rx_mtu = little_endian_read_16(packet, 1); 1095 uint16_t local_rx_mtu = l2cap_max_le_mtu(); 1096 peripheral->mtu = remote_rx_mtu < local_rx_mtu ? remote_rx_mtu : local_rx_mtu; 1097 peripheral->mtu_state = MTU_EXCHANGED; 1098 emit_gatt_mtu_exchanged_result_event(peripheral, peripheral->mtu); 1099 break; 1100 } 1101 case ATT_READ_BY_GROUP_TYPE_RESPONSE: 1102 switch(peripheral->gatt_client_state){ 1103 case P_W4_SERVICE_QUERY_RESULT: 1104 report_gatt_services(peripheral, packet, size); 1105 trigger_next_service_query(peripheral, get_last_result_handle_from_service_list(packet, size)); 1106 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1107 break; 1108 default: 1109 break; 1110 } 1111 break; 1112 case ATT_HANDLE_VALUE_INDICATION: 1113 report_gatt_indication(handle, little_endian_read_16(packet,1), &packet[3], size-3); 1114 peripheral->send_confirmation = 1; 1115 break; 1116 1117 case ATT_READ_BY_TYPE_RESPONSE: 1118 switch (peripheral->gatt_client_state){ 1119 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 1120 report_gatt_characteristics(peripheral, packet, size); 1121 trigger_next_characteristic_query(peripheral, get_last_result_handle_from_characteristics_list(packet, size)); 1122 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1123 break; 1124 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 1125 report_gatt_characteristics(peripheral, packet, size); 1126 trigger_next_characteristic_query(peripheral, get_last_result_handle_from_characteristics_list(packet, size)); 1127 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1128 break; 1129 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: 1130 { 1131 uint16_t uuid16 = 0; 1132 uint16_t pair_size = packet[1]; 1133 1134 if (pair_size < 7){ 1135 // UUIDs not available, query first included service 1136 peripheral->start_group_handle = little_endian_read_16(packet, 2); // ready for next query 1137 peripheral->query_start_handle = little_endian_read_16(packet, 4); 1138 peripheral->query_end_handle = little_endian_read_16(packet,6); 1139 peripheral->gatt_client_state = P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY; 1140 break; 1141 } 1142 1143 uint16_t offset; 1144 for (offset = 2; offset < size; offset += pair_size){ 1145 uint16_t include_handle = little_endian_read_16(packet, offset); 1146 peripheral->query_start_handle = little_endian_read_16(packet,offset+2); 1147 peripheral->query_end_handle = little_endian_read_16(packet,offset+4); 1148 uuid16 = little_endian_read_16(packet, offset+6); 1149 report_gatt_included_service_uuid16(peripheral, include_handle, uuid16); 1150 } 1151 1152 trigger_next_included_service_query(peripheral, get_last_result_handle_from_included_services_list(packet, size)); 1153 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1154 break; 1155 } 1156 case P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT: 1157 peripheral->client_characteristic_configuration_handle = little_endian_read_16(packet, 2); 1158 peripheral->gatt_client_state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 1159 break; 1160 case P_W4_READ_BY_TYPE_RESPONSE: { 1161 uint16_t pair_size = packet[1]; 1162 uint16_t offset; 1163 uint16_t last_result_handle = 0; 1164 for (offset = 2; offset < size ; offset += pair_size){ 1165 uint16_t value_handle = little_endian_read_16(packet, offset); 1166 report_gatt_characteristic_value(peripheral, value_handle, &packet[offset+2], pair_size-2); 1167 last_result_handle = value_handle; 1168 } 1169 trigger_next_read_by_type_query(peripheral, last_result_handle); 1170 break; 1171 } 1172 default: 1173 break; 1174 } 1175 break; 1176 case ATT_READ_RESPONSE: 1177 switch (peripheral->gatt_client_state){ 1178 case P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT: { 1179 uint8_t uuid128[16]; 1180 reverse_128(&packet[1], uuid128); 1181 report_gatt_included_service_uuid128(peripheral, peripheral->start_group_handle, uuid128); 1182 trigger_next_included_service_query(peripheral, peripheral->start_group_handle); 1183 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1184 break; 1185 } 1186 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 1187 gatt_client_handle_transaction_complete(peripheral); 1188 report_gatt_characteristic_value(peripheral, peripheral->attribute_handle, &packet[1], size-1); 1189 emit_gatt_complete_event(peripheral, 0); 1190 break; 1191 1192 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT:{ 1193 gatt_client_handle_transaction_complete(peripheral); 1194 report_gatt_characteristic_descriptor(peripheral, peripheral->attribute_handle, &packet[1], size-1, 0); 1195 emit_gatt_complete_event(peripheral, 0); 1196 break; 1197 } 1198 default: 1199 break; 1200 } 1201 break; 1202 1203 case ATT_FIND_BY_TYPE_VALUE_RESPONSE: 1204 { 1205 uint8_t pair_size = 4; 1206 int i; 1207 uint16_t start_group_handle; 1208 uint16_t end_group_handle= 0xffff; // asserts GATT_EVENT_QUERY_COMPLETE is emitted if no results 1209 for (i = 1; i<size; i+=pair_size){ 1210 start_group_handle = little_endian_read_16(packet,i); 1211 end_group_handle = little_endian_read_16(packet,i+2); 1212 emit_gatt_service_query_result_event(peripheral, start_group_handle, end_group_handle, peripheral->uuid128); 1213 } 1214 trigger_next_service_by_uuid_query(peripheral, end_group_handle); 1215 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1216 break; 1217 } 1218 case ATT_FIND_INFORMATION_REPLY: 1219 { 1220 uint8_t pair_size = 4; 1221 if (packet[1] == 2){ 1222 pair_size = 18; 1223 } 1224 uint16_t last_descriptor_handle = little_endian_read_16(packet, size - pair_size); 1225 report_gatt_all_characteristic_descriptors(peripheral, &packet[2], size-2, pair_size); 1226 trigger_next_characteristic_descriptor_query(peripheral, last_descriptor_handle); 1227 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1228 break; 1229 } 1230 1231 case ATT_WRITE_RESPONSE: 1232 switch (peripheral->gatt_client_state){ 1233 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 1234 gatt_client_handle_transaction_complete(peripheral); 1235 emit_gatt_complete_event(peripheral, 0); 1236 break; 1237 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 1238 gatt_client_handle_transaction_complete(peripheral); 1239 emit_gatt_complete_event(peripheral, 0); 1240 break; 1241 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1242 gatt_client_handle_transaction_complete(peripheral); 1243 emit_gatt_complete_event(peripheral, 0); 1244 break; 1245 default: 1246 break; 1247 } 1248 break; 1249 1250 case ATT_READ_BLOB_RESPONSE:{ 1251 uint16_t received_blob_length = size-1; 1252 switch(peripheral->gatt_client_state){ 1253 case P_W4_READ_BLOB_RESULT: 1254 report_gatt_long_characteristic_value_blob(peripheral, peripheral->attribute_handle, &packet[1], received_blob_length, peripheral->attribute_offset); 1255 trigger_next_blob_query(peripheral, P_W2_SEND_READ_BLOB_QUERY, received_blob_length); 1256 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1257 break; 1258 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 1259 report_gatt_long_characteristic_descriptor(peripheral, peripheral->attribute_handle, 1260 &packet[1], received_blob_length, 1261 peripheral->attribute_offset); 1262 trigger_next_blob_query(peripheral, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, received_blob_length); 1263 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1264 break; 1265 default: 1266 break; 1267 } 1268 break; 1269 } 1270 case ATT_PREPARE_WRITE_RESPONSE: 1271 switch (peripheral->gatt_client_state){ 1272 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 1273 gatt_client_handle_transaction_complete(peripheral); 1274 if (is_value_valid(peripheral, packet, size)){ 1275 emit_gatt_complete_event(peripheral, 0); 1276 } else { 1277 emit_gatt_complete_event(peripheral, ATT_ERROR_DATA_MISMATCH); 1278 } 1279 break; 1280 1281 case P_W4_PREPARE_WRITE_RESULT:{ 1282 peripheral->attribute_offset = little_endian_read_16(packet, 3); 1283 trigger_next_prepare_write_query(peripheral, P_W2_PREPARE_WRITE, P_W2_EXECUTE_PREPARED_WRITE); 1284 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1285 break; 1286 } 1287 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT:{ 1288 peripheral->attribute_offset = little_endian_read_16(packet, 3); 1289 trigger_next_prepare_write_query(peripheral, P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR, P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR); 1290 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1291 break; 1292 } 1293 case P_W4_PREPARE_RELIABLE_WRITE_RESULT:{ 1294 if (is_value_valid(peripheral, packet, size)){ 1295 peripheral->attribute_offset = little_endian_read_16(packet, 3); 1296 trigger_next_prepare_write_query(peripheral, P_W2_PREPARE_RELIABLE_WRITE, P_W2_EXECUTE_PREPARED_WRITE); 1297 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1298 break; 1299 } 1300 peripheral->gatt_client_state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 1301 break; 1302 } 1303 default: 1304 break; 1305 } 1306 break; 1307 1308 case ATT_EXECUTE_WRITE_RESPONSE: 1309 switch (peripheral->gatt_client_state){ 1310 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 1311 gatt_client_handle_transaction_complete(peripheral); 1312 emit_gatt_complete_event(peripheral, 0); 1313 break; 1314 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 1315 gatt_client_handle_transaction_complete(peripheral); 1316 emit_gatt_complete_event(peripheral, 0); 1317 break; 1318 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 1319 gatt_client_handle_transaction_complete(peripheral); 1320 emit_gatt_complete_event(peripheral, ATT_ERROR_DATA_MISMATCH); 1321 break; 1322 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1323 gatt_client_handle_transaction_complete(peripheral); 1324 emit_gatt_complete_event(peripheral, 0); 1325 break; 1326 default: 1327 break; 1328 1329 } 1330 break; 1331 1332 case ATT_READ_MULTIPLE_RESPONSE: 1333 switch(peripheral->gatt_client_state){ 1334 case P_W4_READ_MULTIPLE_RESPONSE: 1335 report_gatt_characteristic_value(peripheral, 0, &packet[1], size-1); 1336 gatt_client_handle_transaction_complete(peripheral); 1337 emit_gatt_complete_event(peripheral, 0); 1338 break; 1339 default: 1340 break; 1341 } 1342 break; 1343 1344 case ATT_ERROR_RESPONSE: 1345 1346 switch (packet[4]){ 1347 case ATT_ERROR_ATTRIBUTE_NOT_FOUND: { 1348 switch(peripheral->gatt_client_state){ 1349 case P_W4_SERVICE_QUERY_RESULT: 1350 case P_W4_SERVICE_WITH_UUID_RESULT: 1351 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: 1352 case P_W4_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT: 1353 gatt_client_handle_transaction_complete(peripheral); 1354 emit_gatt_complete_event(peripheral, 0); 1355 break; 1356 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 1357 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 1358 characteristic_end_found(peripheral, peripheral->end_group_handle); 1359 gatt_client_handle_transaction_complete(peripheral); 1360 emit_gatt_complete_event(peripheral, 0); 1361 break; 1362 case P_W4_READ_BY_TYPE_RESPONSE: 1363 gatt_client_handle_transaction_complete(peripheral); 1364 if (peripheral->start_group_handle == peripheral->query_start_handle){ 1365 emit_gatt_complete_event(peripheral, ATT_ERROR_ATTRIBUTE_NOT_FOUND); 1366 } else { 1367 emit_gatt_complete_event(peripheral, 0); 1368 } 1369 break; 1370 default: 1371 gatt_client_report_error_if_pending(peripheral, packet[4]); 1372 break; 1373 } 1374 break; 1375 } 1376 default: 1377 gatt_client_report_error_if_pending(peripheral, packet[4]); 1378 break; 1379 } 1380 break; 1381 1382 default: 1383 log_info("ATT Handler, unhandled response type 0x%02x", packet[0]); 1384 break; 1385 } 1386 gatt_client_run(); 1387 } 1388 1389 #ifdef ENABLE_LE_SIGNED_WRITE 1390 static void att_signed_write_handle_cmac_result(uint8_t hash[8]){ 1391 btstack_linked_list_iterator_t it; 1392 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 1393 while (btstack_linked_list_iterator_has_next(&it)){ 1394 gatt_client_t * peripheral = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 1395 if (peripheral->gatt_client_state == P_W4_CMAC_RESULT){ 1396 // store result 1397 memcpy(peripheral->cmac, hash, 8); 1398 // reverse_64(hash, peripheral->cmac); 1399 peripheral->gatt_client_state = P_W2_SEND_SIGNED_WRITE; 1400 gatt_client_run(); 1401 return; 1402 } 1403 } 1404 } 1405 1406 uint8_t gatt_client_signed_write_without_response(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t handle, uint16_t message_len, uint8_t * message){ 1407 gatt_client_t * peripheral = provide_context_for_conn_handle(con_handle); 1408 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1409 peripheral->le_device_index = sm_le_device_index(con_handle); 1410 if (peripheral->le_device_index < 0) return GATT_CLIENT_IN_WRONG_STATE; // device lookup not done / no stored bonding information 1411 1412 peripheral->callback = callback; 1413 peripheral->attribute_handle = handle; 1414 peripheral->attribute_length = message_len; 1415 peripheral->attribute_value = message; 1416 peripheral->gatt_client_state = P_W4_CMAC_READY; 1417 1418 gatt_client_run(); 1419 return 0; 1420 } 1421 #endif 1422 1423 uint8_t gatt_client_discover_primary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 1424 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1425 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1426 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1427 1428 peripheral->callback = callback; 1429 peripheral->start_group_handle = 0x0001; 1430 peripheral->end_group_handle = 0xffff; 1431 peripheral->gatt_client_state = P_W2_SEND_SERVICE_QUERY; 1432 peripheral->uuid16 = 0; 1433 gatt_client_run(); 1434 return 0; 1435 } 1436 1437 1438 uint8_t gatt_client_discover_primary_services_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t uuid16){ 1439 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1440 1441 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1442 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1443 1444 peripheral->callback = callback; 1445 peripheral->start_group_handle = 0x0001; 1446 peripheral->end_group_handle = 0xffff; 1447 peripheral->gatt_client_state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 1448 peripheral->uuid16 = uuid16; 1449 uuid_add_bluetooth_prefix((uint8_t*) &(peripheral->uuid128), peripheral->uuid16); 1450 gatt_client_run(); 1451 return 0; 1452 } 1453 1454 uint8_t gatt_client_discover_primary_services_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, const uint8_t * uuid128){ 1455 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1456 1457 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1458 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1459 1460 peripheral->callback = callback; 1461 peripheral->start_group_handle = 0x0001; 1462 peripheral->end_group_handle = 0xffff; 1463 peripheral->uuid16 = 0; 1464 memcpy(peripheral->uuid128, uuid128, 16); 1465 peripheral->gatt_client_state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 1466 gatt_client_run(); 1467 return 0; 1468 } 1469 1470 uint8_t gatt_client_discover_characteristics_for_service(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t *service){ 1471 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1472 1473 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1474 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1475 1476 peripheral->callback = callback; 1477 peripheral->start_group_handle = service->start_group_handle; 1478 peripheral->end_group_handle = service->end_group_handle; 1479 peripheral->filter_with_uuid = 0; 1480 peripheral->characteristic_start_handle = 0; 1481 peripheral->gatt_client_state = P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY; 1482 gatt_client_run(); 1483 return 0; 1484 } 1485 1486 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){ 1487 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1488 1489 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1490 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1491 1492 peripheral->callback = callback; 1493 peripheral->start_group_handle = service->start_group_handle; 1494 peripheral->end_group_handle = service->end_group_handle; 1495 peripheral->gatt_client_state = P_W2_SEND_INCLUDED_SERVICE_QUERY; 1496 1497 gatt_client_run(); 1498 return 0; 1499 } 1500 1501 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){ 1502 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1503 1504 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1505 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1506 1507 peripheral->callback = callback; 1508 peripheral->start_group_handle = start_handle; 1509 peripheral->end_group_handle = end_handle; 1510 peripheral->filter_with_uuid = 1; 1511 peripheral->uuid16 = uuid16; 1512 uuid_add_bluetooth_prefix((uint8_t*) &(peripheral->uuid128), uuid16); 1513 peripheral->characteristic_start_handle = 0; 1514 peripheral->gatt_client_state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 1515 1516 gatt_client_run(); 1517 return 0; 1518 } 1519 1520 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, uint8_t * uuid128){ 1521 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1522 1523 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1524 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1525 1526 peripheral->callback = callback; 1527 peripheral->start_group_handle = start_handle; 1528 peripheral->end_group_handle = end_handle; 1529 peripheral->filter_with_uuid = 1; 1530 peripheral->uuid16 = 0; 1531 memcpy(peripheral->uuid128, uuid128, 16); 1532 peripheral->characteristic_start_handle = 0; 1533 peripheral->gatt_client_state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 1534 1535 gatt_client_run(); 1536 return 0; 1537 } 1538 1539 1540 uint8_t gatt_client_discover_characteristics_for_service_by_uuid16(btstack_packet_handler_t callback, uint16_t handle, gatt_client_service_t *service, uint16_t uuid16){ 1541 return gatt_client_discover_characteristics_for_handle_range_by_uuid16(callback, handle, service->start_group_handle, service->end_group_handle, uuid16); 1542 } 1543 1544 uint8_t gatt_client_discover_characteristics_for_service_by_uuid128(btstack_packet_handler_t callback, uint16_t handle, gatt_client_service_t *service, uint8_t * uuid128){ 1545 return gatt_client_discover_characteristics_for_handle_range_by_uuid128(callback, handle, service->start_group_handle, service->end_group_handle, uuid128); 1546 } 1547 1548 uint8_t gatt_client_discover_characteristic_descriptors(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t *characteristic){ 1549 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1550 1551 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1552 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1553 1554 if (characteristic->value_handle == characteristic->end_handle){ 1555 emit_gatt_complete_event(peripheral, 0); 1556 return 0; 1557 } 1558 peripheral->callback = callback; 1559 peripheral->start_group_handle = characteristic->value_handle + 1; 1560 peripheral->end_group_handle = characteristic->end_handle; 1561 peripheral->gatt_client_state = P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY; 1562 1563 gatt_client_run(); 1564 return 0; 1565 } 1566 1567 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){ 1568 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1569 1570 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1571 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1572 1573 peripheral->callback = callback; 1574 peripheral->attribute_handle = value_handle; 1575 peripheral->attribute_offset = 0; 1576 peripheral->gatt_client_state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY; 1577 gatt_client_run(); 1578 return 0; 1579 } 1580 1581 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){ 1582 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1583 1584 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1585 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1586 1587 peripheral->callback = callback; 1588 peripheral->start_group_handle = start_handle; 1589 peripheral->end_group_handle = end_handle; 1590 peripheral->query_start_handle = start_handle; 1591 peripheral->query_end_handle = end_handle; 1592 peripheral->uuid16 = uuid16; 1593 uuid_add_bluetooth_prefix((uint8_t*) &(peripheral->uuid128), uuid16); 1594 peripheral->gatt_client_state = P_W2_SEND_READ_BY_TYPE_REQUEST; 1595 gatt_client_run(); 1596 return 0; 1597 } 1598 1599 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, uint8_t * uuid128){ 1600 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1601 1602 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1603 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1604 1605 peripheral->callback = callback; 1606 peripheral->start_group_handle = start_handle; 1607 peripheral->end_group_handle = end_handle; 1608 peripheral->query_start_handle = start_handle; 1609 peripheral->query_end_handle = end_handle; 1610 peripheral->uuid16 = 0; 1611 memcpy(peripheral->uuid128, uuid128, 16); 1612 peripheral->gatt_client_state = P_W2_SEND_READ_BY_TYPE_REQUEST; 1613 gatt_client_run(); 1614 return 0; 1615 } 1616 1617 1618 uint8_t gatt_client_read_value_of_characteristic(btstack_packet_handler_t callback, uint16_t handle, gatt_client_characteristic_t *characteristic){ 1619 return gatt_client_read_value_of_characteristic_using_value_handle(callback, handle, characteristic->value_handle); 1620 } 1621 1622 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 characteristic_value_handle, uint16_t offset){ 1623 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1624 1625 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1626 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1627 1628 peripheral->callback = callback; 1629 peripheral->attribute_handle = characteristic_value_handle; 1630 peripheral->attribute_offset = offset; 1631 peripheral->gatt_client_state = P_W2_SEND_READ_BLOB_QUERY; 1632 gatt_client_run(); 1633 return 0; 1634 } 1635 1636 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 characteristic_value_handle){ 1637 return gatt_client_read_long_value_of_characteristic_using_value_handle_with_offset(callback, con_handle, characteristic_value_handle, 0); 1638 } 1639 1640 uint8_t gatt_client_read_long_value_of_characteristic(btstack_packet_handler_t callback, uint16_t handle, gatt_client_characteristic_t *characteristic){ 1641 return gatt_client_read_long_value_of_characteristic_using_value_handle(callback, handle, characteristic->value_handle); 1642 } 1643 1644 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){ 1645 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1646 1647 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1648 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1649 1650 peripheral->callback = callback; 1651 peripheral->read_multiple_handle_count = num_value_handles; 1652 peripheral->read_multiple_handles = value_handles; 1653 peripheral->gatt_client_state = P_W2_SEND_READ_MULTIPLE_REQUEST; 1654 gatt_client_run(); 1655 return 0; 1656 } 1657 1658 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){ 1659 gatt_client_t * peripheral = provide_context_for_conn_handle(con_handle); 1660 1661 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1662 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1663 1664 if (value_length > peripheral_mtu(peripheral) - 3) return GATT_CLIENT_VALUE_TOO_LONG; 1665 if (!att_dispatch_client_can_send_now(peripheral->con_handle)) return GATT_CLIENT_BUSY; 1666 1667 att_write_request(ATT_WRITE_COMMAND, peripheral->con_handle, value_handle, value_length, value); 1668 return 0; 1669 } 1670 1671 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 * data){ 1672 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1673 1674 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1675 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1676 1677 peripheral->callback = callback; 1678 peripheral->attribute_handle = value_handle; 1679 peripheral->attribute_length = value_length; 1680 peripheral->attribute_value = data; 1681 peripheral->gatt_client_state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 1682 gatt_client_run(); 1683 return 0; 1684 } 1685 1686 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 * data){ 1687 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1688 1689 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1690 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1691 1692 peripheral->callback = callback; 1693 peripheral->attribute_handle = value_handle; 1694 peripheral->attribute_length = value_length; 1695 peripheral->attribute_offset = offset; 1696 peripheral->attribute_value = data; 1697 peripheral->gatt_client_state = P_W2_PREPARE_WRITE; 1698 gatt_client_run(); 1699 return 0; 1700 } 1701 1702 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){ 1703 return gatt_client_write_long_value_of_characteristic_with_offset(callback, con_handle, value_handle, 0, value_length, value); 1704 } 1705 1706 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){ 1707 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1708 1709 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1710 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1711 1712 peripheral->callback = callback; 1713 peripheral->attribute_handle = value_handle; 1714 peripheral->attribute_length = value_length; 1715 peripheral->attribute_offset = 0; 1716 peripheral->attribute_value = value; 1717 peripheral->gatt_client_state = P_W2_PREPARE_RELIABLE_WRITE; 1718 gatt_client_run(); 1719 return 0; 1720 } 1721 1722 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){ 1723 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1724 1725 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1726 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1727 1728 if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION) && 1729 (characteristic->properties & ATT_PROPERTY_NOTIFY) == 0) { 1730 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED"); 1731 return GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED; 1732 } else if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION) && 1733 (characteristic->properties & ATT_PROPERTY_INDICATE) == 0){ 1734 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED"); 1735 return GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED; 1736 } 1737 1738 peripheral->callback = callback; 1739 peripheral->start_group_handle = characteristic->value_handle; 1740 peripheral->end_group_handle = characteristic->end_handle; 1741 little_endian_store_16(peripheral->client_characteristic_configuration_value, 0, configuration); 1742 1743 peripheral->gatt_client_state = P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 1744 gatt_client_run(); 1745 return 0; 1746 } 1747 1748 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){ 1749 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1750 1751 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1752 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1753 1754 peripheral->callback = callback; 1755 peripheral->attribute_handle = descriptor_handle; 1756 1757 peripheral->gatt_client_state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 1758 gatt_client_run(); 1759 return 0; 1760 } 1761 1762 uint8_t gatt_client_read_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor){ 1763 return gatt_client_read_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 1764 } 1765 1766 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){ 1767 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1768 1769 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1770 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1771 1772 peripheral->callback = callback; 1773 peripheral->attribute_handle = descriptor_handle; 1774 peripheral->attribute_offset = offset; 1775 peripheral->gatt_client_state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 1776 gatt_client_run(); 1777 return 0; 1778 } 1779 1780 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){ 1781 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0); 1782 } 1783 1784 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){ 1785 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 1786 } 1787 1788 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 length, uint8_t * data){ 1789 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1790 1791 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1792 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1793 1794 peripheral->callback = callback; 1795 peripheral->attribute_handle = descriptor_handle; 1796 peripheral->attribute_length = length; 1797 peripheral->attribute_offset = 0; 1798 peripheral->attribute_value = data; 1799 peripheral->gatt_client_state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 1800 gatt_client_run(); 1801 return 0; 1802 } 1803 1804 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 length, uint8_t * value){ 1805 return gatt_client_write_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, length, value); 1806 } 1807 1808 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 length, uint8_t * data){ 1809 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1810 1811 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1812 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1813 1814 peripheral->callback = callback; 1815 peripheral->attribute_handle = descriptor_handle; 1816 peripheral->attribute_length = length; 1817 peripheral->attribute_offset = offset; 1818 peripheral->attribute_value = data; 1819 peripheral->gatt_client_state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 1820 gatt_client_run(); 1821 return 0; 1822 } 1823 1824 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 length, uint8_t * data){ 1825 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0, length, data ); 1826 } 1827 1828 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 length, uint8_t * value){ 1829 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, length, value); 1830 } 1831 1832 /** 1833 * @brief -> gatt complete event 1834 */ 1835 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 length, uint8_t * data){ 1836 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1837 1838 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1839 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1840 1841 peripheral->callback = callback; 1842 peripheral->attribute_handle = attribute_handle; 1843 peripheral->attribute_length = length; 1844 peripheral->attribute_offset = offset; 1845 peripheral->attribute_value = data; 1846 peripheral->gatt_client_state = P_W2_PREPARE_WRITE_SINGLE; 1847 gatt_client_run(); 1848 return 0; 1849 } 1850 1851 /** 1852 * @brief -> gatt complete event 1853 */ 1854 uint8_t gatt_client_execute_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 1855 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1856 1857 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1858 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1859 1860 peripheral->callback = callback; 1861 peripheral->gatt_client_state = P_W2_EXECUTE_PREPARED_WRITE; 1862 gatt_client_run(); 1863 return 0; 1864 } 1865 1866 /** 1867 * @brief -> gatt complete event 1868 */ 1869 uint8_t gatt_client_cancel_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 1870 gatt_client_t * peripheral = provide_context_for_conn_handle_and_start_timer(con_handle); 1871 1872 if (!peripheral) return BTSTACK_MEMORY_ALLOC_FAILED; 1873 if (!is_ready(peripheral)) return GATT_CLIENT_IN_WRONG_STATE; 1874 1875 peripheral->callback = callback; 1876 peripheral->gatt_client_state = P_W2_CANCEL_PREPARED_WRITE; 1877 gatt_client_run(); 1878 return 0; 1879 } 1880 1881 void gatt_client_deserialize_service(const uint8_t *packet, int offset, gatt_client_service_t *service){ 1882 service->start_group_handle = little_endian_read_16(packet, offset); 1883 service->end_group_handle = little_endian_read_16(packet, offset + 2); 1884 reverse_128(&packet[offset + 4], service->uuid128); 1885 if (uuid_has_bluetooth_prefix(service->uuid128)){ 1886 service->uuid16 = big_endian_read_32(service->uuid128, 0); 1887 } 1888 } 1889 1890 void gatt_client_deserialize_characteristic(const uint8_t * packet, int offset, gatt_client_characteristic_t * characteristic){ 1891 characteristic->start_handle = little_endian_read_16(packet, offset); 1892 characteristic->value_handle = little_endian_read_16(packet, offset + 2); 1893 characteristic->end_handle = little_endian_read_16(packet, offset + 4); 1894 characteristic->properties = little_endian_read_16(packet, offset + 6); 1895 reverse_128(&packet[offset+8], characteristic->uuid128); 1896 if (uuid_has_bluetooth_prefix(characteristic->uuid128)){ 1897 characteristic->uuid16 = big_endian_read_32(characteristic->uuid128, 0); 1898 } 1899 } 1900 1901 void gatt_client_deserialize_characteristic_descriptor(const uint8_t * packet, int offset, gatt_client_characteristic_descriptor_t * descriptor){ 1902 descriptor->handle = little_endian_read_16(packet, offset); 1903 reverse_128(&packet[offset+2], descriptor->uuid128); 1904 if (uuid_has_bluetooth_prefix(descriptor->uuid128)){ 1905 descriptor->uuid16 = big_endian_read_32(descriptor->uuid128, 0); 1906 } 1907 } 1908 1909 void gatt_client_send_mtu_negotiation(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 1910 gatt_client_t * context = provide_context_for_conn_handle(con_handle); 1911 if (!context) return; 1912 if (context->mtu_state == MTU_AUTO_EXCHANGE_DISABLED){ 1913 context->callback = callback; 1914 context->mtu_state = SEND_MTU_EXCHANGE; 1915 gatt_client_run(); 1916 } 1917 } 1918