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 "btstack_debug.h" 52 #include "btstack_event.h" 53 #include "btstack_memory.h" 54 #include "btstack_run_loop.h" 55 #include "btstack_util.h" 56 #include "hci.h" 57 #include "hci_dump.h" 58 #include "l2cap.h" 59 #include "classic/sdp_client.h" 60 #include "bluetooth_gatt.h" 61 #include "bluetooth_sdp.h" 62 #include "classic/sdp_util.h" 63 64 static btstack_linked_list_t gatt_client_connections; 65 static btstack_linked_list_t gatt_client_value_listeners; 66 static btstack_packet_callback_registration_t hci_event_callback_registration; 67 static btstack_packet_callback_registration_t sm_event_callback_registration; 68 69 // GATT Client Configuration 70 static bool gatt_client_mtu_exchange_enabled; 71 static gap_security_level_t gatt_client_required_security_level; 72 73 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size); 74 static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 75 static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code); 76 77 #ifdef ENABLE_LE_SIGNED_WRITE 78 static void att_signed_write_handle_cmac_result(uint8_t hash[8]); 79 #endif 80 81 #ifdef ENABLE_GATT_OVER_CLASSIC 82 static gatt_client_t * gatt_client_get_context_for_l2cap_cid(uint16_t l2cap_cid); 83 static void gatt_client_classic_handle_connected(gatt_client_t * gatt_client, uint8_t status); 84 static void gatt_client_classic_handle_disconnected(gatt_client_t * gatt_client); 85 #endif 86 87 #ifdef ENABLE_GATT_OVER_EATT 88 static bool gatt_client_le_enhanced_handle_can_send_query(gatt_client_t * gatt_client); 89 #endif 90 91 void gatt_client_init(void){ 92 gatt_client_connections = NULL; 93 94 // default configuration 95 gatt_client_mtu_exchange_enabled = true; 96 gatt_client_required_security_level = LEVEL_0; 97 98 // register for HCI Events 99 hci_event_callback_registration.callback = &gatt_client_event_packet_handler; 100 hci_add_event_handler(&hci_event_callback_registration); 101 102 // register for SM Events 103 sm_event_callback_registration.callback = &gatt_client_event_packet_handler; 104 sm_add_event_handler(&sm_event_callback_registration); 105 106 // and ATT Client PDUs 107 att_dispatch_register_client(gatt_client_att_packet_handler); 108 } 109 110 void gatt_client_set_required_security_level(gap_security_level_t level){ 111 gatt_client_required_security_level = level; 112 } 113 114 static gatt_client_t * gatt_client_for_timer(btstack_timer_source_t * ts){ 115 btstack_linked_list_iterator_t it; 116 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 117 while (btstack_linked_list_iterator_has_next(&it)){ 118 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 119 if (&gatt_client->gc_timeout == ts) { 120 return gatt_client; 121 } 122 } 123 return NULL; 124 } 125 126 static void gatt_client_timeout_handler(btstack_timer_source_t * timer){ 127 gatt_client_t * gatt_client = gatt_client_for_timer(timer); 128 if (gatt_client == NULL) return; 129 log_info("GATT client timeout handle, handle 0x%02x", gatt_client->con_handle); 130 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_TIMEOUT); 131 } 132 133 static void gatt_client_timeout_start(gatt_client_t * gatt_client){ 134 log_info("GATT client timeout start, handle 0x%02x", gatt_client->con_handle); 135 btstack_run_loop_remove_timer(&gatt_client->gc_timeout); 136 btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_timeout_handler); 137 btstack_run_loop_set_timer(&gatt_client->gc_timeout, 30000); // 30 seconds sm timeout 138 btstack_run_loop_add_timer(&gatt_client->gc_timeout); 139 } 140 141 static void gatt_client_timeout_stop(gatt_client_t * gatt_client){ 142 log_info("GATT client timeout stop, handle 0x%02x", gatt_client->con_handle); 143 btstack_run_loop_remove_timer(&gatt_client->gc_timeout); 144 } 145 146 static gap_security_level_t gatt_client_le_security_level_for_connection(hci_con_handle_t con_handle){ 147 uint8_t encryption_key_size = gap_encryption_key_size(con_handle); 148 if (encryption_key_size == 0) return LEVEL_0; 149 150 bool authenticated = gap_authenticated(con_handle); 151 if (!authenticated) return LEVEL_2; 152 153 return encryption_key_size == 16 ? LEVEL_4 : LEVEL_3; 154 } 155 156 static gatt_client_t * gatt_client_get_context_for_handle(uint16_t handle){ 157 btstack_linked_item_t *it; 158 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 159 gatt_client_t * gatt_client = (gatt_client_t *) it; 160 if (gatt_client->con_handle == handle){ 161 return gatt_client; 162 } 163 } 164 return NULL; 165 } 166 167 168 // @return gatt_client context 169 // returns existing one, or tries to setup new one 170 static uint8_t gatt_client_provide_context_for_handle(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 171 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 172 173 if (gatt_client != NULL){ 174 *out_gatt_client = gatt_client; 175 return ERROR_CODE_SUCCESS; 176 } 177 178 // bail if no such hci connection 179 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 180 if (hci_connection == NULL){ 181 log_error("No connection for handle 0x%04x", con_handle); 182 *out_gatt_client = NULL; 183 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 184 } 185 186 gatt_client = btstack_memory_gatt_client_get(); 187 if (gatt_client == NULL){ 188 *out_gatt_client = NULL; 189 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 190 } 191 // init state 192 gatt_client->bearer_type = ATT_BEARER_UNENHANCED_LE; 193 gatt_client->con_handle = con_handle; 194 gatt_client->mtu = ATT_DEFAULT_MTU; 195 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 196 if (gatt_client_mtu_exchange_enabled){ 197 gatt_client->mtu_state = SEND_MTU_EXCHANGE; 198 } else { 199 gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 200 } 201 gatt_client->state = P_READY; 202 #ifdef ENABLE_GATT_OVER_EATT 203 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 204 #endif 205 btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); 206 207 // get unenhanced att bearer state 208 if (hci_connection->att_connection.mtu_exchanged){ 209 gatt_client->mtu = hci_connection->att_connection.mtu; 210 gatt_client->mtu_state = MTU_EXCHANGED; 211 } 212 *out_gatt_client = gatt_client; 213 return ERROR_CODE_SUCCESS; 214 } 215 216 static bool is_ready(gatt_client_t * gatt_client){ 217 return gatt_client->state == P_READY; 218 } 219 220 static uint8_t gatt_client_provide_context_for_request(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 221 gatt_client_t * gatt_client = NULL; 222 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 223 if (status != ERROR_CODE_SUCCESS){ 224 return status; 225 } 226 227 #ifdef ENABLE_GATT_OVER_EATT 228 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY){ 229 btstack_linked_list_iterator_t it; 230 gatt_client_t * eatt_client = NULL; 231 // find free eatt client 232 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 233 while (btstack_linked_list_iterator_has_next(&it)){ 234 gatt_client_t * client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 235 if (client->state == P_READY){ 236 eatt_client = client; 237 break; 238 } 239 } 240 if (eatt_client == NULL){ 241 return ERROR_CODE_COMMAND_DISALLOWED; 242 } 243 gatt_client = eatt_client; 244 } 245 #endif 246 247 if (is_ready(gatt_client) == 0){ 248 return GATT_CLIENT_IN_WRONG_STATE; 249 } 250 251 gatt_client_timeout_start(gatt_client); 252 253 *out_gatt_client = gatt_client; 254 255 return status; 256 } 257 258 int gatt_client_is_ready(hci_con_handle_t con_handle){ 259 gatt_client_t * gatt_client; 260 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 261 if (status != ERROR_CODE_SUCCESS){ 262 return 0; 263 } 264 return is_ready(gatt_client) ? 1 : 0; 265 } 266 267 void gatt_client_mtu_enable_auto_negotiation(uint8_t enabled){ 268 gatt_client_mtu_exchange_enabled = enabled != 0; 269 } 270 271 uint8_t gatt_client_get_mtu(hci_con_handle_t con_handle, uint16_t * mtu){ 272 gatt_client_t * gatt_client; 273 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 274 if (status != ERROR_CODE_SUCCESS){ 275 return status; 276 } 277 278 if ((gatt_client->mtu_state == MTU_EXCHANGED) || (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED)){ 279 *mtu = gatt_client->mtu; 280 return ERROR_CODE_SUCCESS; 281 } 282 *mtu = ATT_DEFAULT_MTU; 283 return GATT_CLIENT_IN_WRONG_STATE; 284 } 285 286 #ifdef ENABLE_GATT_OVER_CLASSIC 287 // TODO: re-use single buffer for all eatt channels 288 static uint8_t gatt_client_le_enhanced_request_buffer[512]; 289 #endif 290 291 static uint8_t *gatt_client_reserve_request_buffer(gatt_client_t *gatt_client) { 292 switch (gatt_client->bearer_type){ 293 #ifdef ENABLE_GATT_OVER_CLASSIC 294 case ATT_BEARER_UNENHANCED_CLASSIC: 295 #endif 296 case ATT_BEARER_UNENHANCED_LE: 297 l2cap_reserve_packet_buffer(); 298 return l2cap_get_outgoing_buffer(); 299 #ifdef ENABLE_GATT_OVER_EATT 300 case ATT_BEARER_ENHANCED_LE: 301 return gatt_client->eatt_storage_buffer; 302 #endif 303 default: 304 btstack_unreachable(); 305 break; 306 } 307 return NULL; 308 } 309 310 // precondition: can_send_packet_now == TRUE 311 static uint8_t gatt_client_send(gatt_client_t * gatt_client, uint16_t len){ 312 switch (gatt_client->bearer_type){ 313 case ATT_BEARER_UNENHANCED_LE: 314 return l2cap_send_prepared_connectionless(gatt_client->con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, len); 315 #ifdef ENABLE_GATT_OVER_CLASSIC 316 case ATT_BEARER_UNENHANCED_CLASSIC: 317 return l2cap_send_prepared(gatt_client->l2cap_cid, len); 318 #endif 319 #ifdef ENABLE_GATT_OVER_EATT 320 case ATT_BEARER_ENHANCED_LE: 321 return l2cap_send(gatt_client->l2cap_cid, gatt_client->eatt_storage_buffer, len); 322 #endif 323 default: 324 btstack_unreachable(); 325 return ERROR_CODE_HARDWARE_FAILURE; 326 } 327 } 328 329 // precondition: can_send_packet_now == TRUE 330 static uint8_t att_confirmation(gatt_client_t * gatt_client) { 331 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 332 333 request[0] = ATT_HANDLE_VALUE_CONFIRMATION; 334 335 return gatt_client_send(gatt_client, 1); 336 } 337 338 // precondition: can_send_packet_now == TRUE 339 static uint8_t att_find_information_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t start_handle, 340 uint16_t end_handle) { 341 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 342 343 request[0] = request_type; 344 little_endian_store_16(request, 1, start_handle); 345 little_endian_store_16(request, 3, end_handle); 346 347 return gatt_client_send(gatt_client, 5); 348 } 349 350 // precondition: can_send_packet_now == TRUE 351 static uint8_t 352 att_find_by_type_value_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_group_type, 353 uint16_t start_handle, uint16_t end_handle, uint8_t *value, uint16_t value_size) { 354 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 355 request[0] = request_type; 356 357 little_endian_store_16(request, 1, start_handle); 358 little_endian_store_16(request, 3, end_handle); 359 little_endian_store_16(request, 5, attribute_group_type); 360 (void)memcpy(&request[7], value, value_size); 361 362 return gatt_client_send(gatt_client, 7u + value_size); 363 } 364 365 // precondition: can_send_packet_now == TRUE 366 static uint8_t 367 att_read_by_type_or_group_request_for_uuid16(gatt_client_t *gatt_client, uint8_t request_type, uint16_t uuid16, 368 uint16_t start_handle, uint16_t end_handle) { 369 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 370 371 request[0] = request_type; 372 little_endian_store_16(request, 1, start_handle); 373 little_endian_store_16(request, 3, end_handle); 374 little_endian_store_16(request, 5, uuid16); 375 376 return gatt_client_send(gatt_client, 7); 377 } 378 379 // precondition: can_send_packet_now == TRUE 380 static uint8_t 381 att_read_by_type_or_group_request_for_uuid128(gatt_client_t *gatt_client, uint8_t request_type, const uint8_t *uuid128, 382 uint16_t start_handle, uint16_t end_handle) { 383 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 384 385 request[0] = request_type; 386 little_endian_store_16(request, 1, start_handle); 387 little_endian_store_16(request, 3, end_handle); 388 reverse_128(uuid128, &request[5]); 389 390 return gatt_client_send(gatt_client, 21); 391 } 392 393 // precondition: can_send_packet_now == TRUE 394 static uint8_t att_read_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle) { 395 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 396 397 request[0] = request_type; 398 little_endian_store_16(request, 1, attribute_handle); 399 400 return gatt_client_send(gatt_client, 3); 401 } 402 403 // precondition: can_send_packet_now == TRUE 404 static uint8_t att_read_blob_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, 405 uint16_t value_offset) { 406 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 407 408 request[0] = request_type; 409 little_endian_store_16(request, 1, attribute_handle); 410 little_endian_store_16(request, 3, value_offset); 411 412 return gatt_client_send(gatt_client, 5); 413 } 414 415 static uint8_t 416 att_read_multiple_request_with_opcode(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles, uint8_t opcode) { 417 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 418 419 request[0] = opcode; 420 uint16_t i; 421 uint16_t offset = 1; 422 for (i=0;i<num_value_handles;i++){ 423 little_endian_store_16(request, offset, value_handles[i]); 424 offset += 2; 425 } 426 427 return gatt_client_send(gatt_client, offset); 428 } 429 430 static uint8_t 431 att_read_multiple_request(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles) { 432 return att_read_multiple_request_with_opcode(gatt_client, num_value_handles, value_handles, ATT_READ_MULTIPLE_REQUEST); 433 } 434 435 #ifdef ENABLE_GATT_OVER_EATT 436 static uint8_t 437 att_read_multiple_variable_request(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles) { 438 return att_read_multiple_request_with_opcode(gatt_client, num_value_handles, value_handles, ATT_READ_MULTIPLE_VARIABLE_REQ); 439 } 440 #endif 441 442 #ifdef ENABLE_LE_SIGNED_WRITE 443 // precondition: can_send_packet_now == TRUE 444 static uint8_t att_signed_write_request(gatt_client_t *gatt_client, uint16_t request_type, uint16_t attribute_handle, 445 uint16_t value_length, uint8_t *value, uint32_t sign_counter, uint8_t sgn[8]) { 446 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 447 448 request[0] = request_type; 449 little_endian_store_16(request, 1, attribute_handle); 450 (void)memcpy(&request[3], value, value_length); 451 little_endian_store_32(request, 3 + value_length, sign_counter); 452 reverse_64(sgn, &request[3 + value_length + 4]); 453 454 return gatt_client_send(gatt_client, 3 + value_length + 12); 455 } 456 #endif 457 458 // precondition: can_send_packet_now == TRUE 459 static uint8_t 460 att_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, uint16_t value_length, 461 uint8_t *value) { 462 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 463 464 request[0] = request_type; 465 little_endian_store_16(request, 1, attribute_handle); 466 (void)memcpy(&request[3], value, value_length); 467 468 return gatt_client_send(gatt_client, 3u + value_length); 469 } 470 471 // precondition: can_send_packet_now == TRUE 472 static uint8_t att_execute_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint8_t execute_write) { 473 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 474 475 request[0] = request_type; 476 request[1] = execute_write; 477 478 return gatt_client_send(gatt_client, 2); 479 } 480 481 // precondition: can_send_packet_now == TRUE 482 static uint8_t att_prepare_write_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, 483 uint16_t value_offset, uint16_t blob_length, uint8_t *value) { 484 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 485 486 request[0] = request_type; 487 little_endian_store_16(request, 1, attribute_handle); 488 little_endian_store_16(request, 3, value_offset); 489 (void)memcpy(&request[5], &value[value_offset], blob_length); 490 491 return gatt_client_send(gatt_client, 5u + blob_length); 492 } 493 494 static uint8_t att_exchange_mtu_request(gatt_client_t *gatt_client) { 495 uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); 496 497 request[0] = ATT_EXCHANGE_MTU_REQUEST; 498 uint16_t mtu = l2cap_max_le_mtu(); 499 little_endian_store_16(request, 1, mtu); 500 501 return gatt_client_send(gatt_client, 3); 502 } 503 504 static uint16_t write_blob_length(gatt_client_t * gatt_client){ 505 uint16_t max_blob_length = gatt_client->mtu - 5u; 506 if (gatt_client->attribute_offset >= gatt_client->attribute_length) { 507 return 0; 508 } 509 uint16_t rest_length = gatt_client->attribute_length - gatt_client->attribute_offset; 510 if (max_blob_length > rest_length){ 511 return rest_length; 512 } 513 return max_blob_length; 514 } 515 516 static void send_gatt_services_request(gatt_client_t *gatt_client){ 517 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_GROUP_TYPE_REQUEST, 518 gatt_client->uuid16, gatt_client->start_group_handle, 519 gatt_client->end_group_handle); 520 } 521 522 static void send_gatt_by_uuid_request(gatt_client_t *gatt_client, uint16_t attribute_group_type){ 523 if (gatt_client->uuid16){ 524 uint8_t uuid16[2]; 525 little_endian_store_16(uuid16, 0, gatt_client->uuid16); 526 att_find_by_type_value_request(gatt_client, ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, 527 gatt_client->start_group_handle, gatt_client->end_group_handle, uuid16, 2); 528 return; 529 } 530 uint8_t uuid128[16]; 531 reverse_128(gatt_client->uuid128, uuid128); 532 att_find_by_type_value_request(gatt_client, ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, 533 gatt_client->start_group_handle, gatt_client->end_group_handle, uuid128, 16); 534 } 535 536 static void send_gatt_services_by_uuid_request(gatt_client_t *gatt_client){ 537 send_gatt_by_uuid_request(gatt_client, GATT_PRIMARY_SERVICE_UUID); 538 } 539 540 static void send_gatt_included_service_uuid_request(gatt_client_t *gatt_client){ 541 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->query_start_handle); 542 } 543 544 static void send_gatt_included_service_request(gatt_client_t *gatt_client){ 545 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 546 GATT_INCLUDE_SERVICE_UUID, gatt_client->start_group_handle, 547 gatt_client->end_group_handle); 548 } 549 550 static void send_gatt_characteristic_request(gatt_client_t *gatt_client){ 551 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 552 GATT_CHARACTERISTICS_UUID, gatt_client->start_group_handle, 553 gatt_client->end_group_handle); 554 } 555 556 static void send_gatt_characteristic_descriptor_request(gatt_client_t *gatt_client){ 557 att_find_information_request(gatt_client, ATT_FIND_INFORMATION_REQUEST, gatt_client->start_group_handle, 558 gatt_client->end_group_handle); 559 } 560 561 static void send_gatt_read_characteristic_value_request(gatt_client_t *gatt_client){ 562 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 563 } 564 565 static void send_gatt_read_by_type_request(gatt_client_t * gatt_client){ 566 if (gatt_client->uuid16){ 567 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 568 gatt_client->uuid16, gatt_client->start_group_handle, 569 gatt_client->end_group_handle); 570 } else { 571 att_read_by_type_or_group_request_for_uuid128(gatt_client, ATT_READ_BY_TYPE_REQUEST, 572 gatt_client->uuid128, gatt_client->start_group_handle, 573 gatt_client->end_group_handle); 574 } 575 } 576 577 static void send_gatt_read_blob_request(gatt_client_t *gatt_client){ 578 if (gatt_client->attribute_offset == 0){ 579 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 580 } else { 581 att_read_blob_request(gatt_client, ATT_READ_BLOB_REQUEST, gatt_client->attribute_handle, 582 gatt_client->attribute_offset); 583 } 584 } 585 586 static void send_gatt_read_multiple_request(gatt_client_t * gatt_client){ 587 att_read_multiple_request(gatt_client, gatt_client->read_multiple_handle_count, gatt_client->read_multiple_handles); 588 } 589 590 #ifdef ENABLE_GATT_OVER_EATT 591 static void send_gatt_read_multiple_variable_request(gatt_client_t * gatt_client){ 592 att_read_multiple_variable_request(gatt_client, gatt_client->read_multiple_handle_count, gatt_client->read_multiple_handles); 593 } 594 #endif 595 596 static void send_gatt_write_attribute_value_request(gatt_client_t * gatt_client){ 597 att_write_request(gatt_client, ATT_WRITE_REQUEST, gatt_client->attribute_handle, gatt_client->attribute_length, 598 gatt_client->attribute_value); 599 } 600 601 static void send_gatt_write_client_characteristic_configuration_request(gatt_client_t * gatt_client){ 602 att_write_request(gatt_client, ATT_WRITE_REQUEST, gatt_client->client_characteristic_configuration_handle, 2, 603 gatt_client->client_characteristic_configuration_value); 604 } 605 606 static void send_gatt_prepare_write_request(gatt_client_t * gatt_client){ 607 att_prepare_write_request(gatt_client, ATT_PREPARE_WRITE_REQUEST, gatt_client->attribute_handle, 608 gatt_client->attribute_offset, write_blob_length(gatt_client), 609 gatt_client->attribute_value); 610 } 611 612 static void send_gatt_execute_write_request(gatt_client_t * gatt_client){ 613 att_execute_write_request(gatt_client, ATT_EXECUTE_WRITE_REQUEST, 1); 614 } 615 616 static void send_gatt_cancel_prepared_write_request(gatt_client_t * gatt_client){ 617 att_execute_write_request(gatt_client, ATT_EXECUTE_WRITE_REQUEST, 0); 618 } 619 620 #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 621 static void send_gatt_read_client_characteristic_configuration_request(gatt_client_t * gatt_client){ 622 att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, 623 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION, 624 gatt_client->start_group_handle, gatt_client->end_group_handle); 625 } 626 #endif 627 628 static void send_gatt_read_characteristic_descriptor_request(gatt_client_t * gatt_client){ 629 att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); 630 } 631 632 #ifdef ENABLE_LE_SIGNED_WRITE 633 static void send_gatt_signed_write_request(gatt_client_t * gatt_client, uint32_t sign_counter){ 634 att_signed_write_request(gatt_client, ATT_SIGNED_WRITE_COMMAND, gatt_client->attribute_handle, 635 gatt_client->attribute_length, gatt_client->attribute_value, sign_counter, 636 gatt_client->cmac); 637 } 638 #endif 639 640 static uint16_t get_last_result_handle_from_service_list(uint8_t * packet, uint16_t size){ 641 if (size < 2) return 0xffff; 642 uint8_t attr_length = packet[1]; 643 if ((2 + attr_length) > size) return 0xffff; 644 return little_endian_read_16(packet, size - attr_length + 2u); 645 } 646 647 static uint16_t get_last_result_handle_from_characteristics_list(uint8_t * packet, uint16_t size){ 648 if (size < 2) return 0xffff; 649 uint8_t attr_length = packet[1]; 650 if ((2 + attr_length) > size) return 0xffff; 651 return little_endian_read_16(packet, size - attr_length + 3u); 652 } 653 654 static uint16_t get_last_result_handle_from_included_services_list(uint8_t * packet, uint16_t size){ 655 if (size < 2) return 0xffff; 656 uint8_t attr_length = packet[1]; 657 if ((2 + attr_length) > size) return 0xffff; 658 return little_endian_read_16(packet, size - attr_length); 659 } 660 661 static void gatt_client_notify_can_send_query(gatt_client_t * gatt_client){ 662 663 #ifdef ENABLE_GATT_OVER_EATT 664 // if eatt is ready, notify all clients that can send a query 665 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY){ 666 btstack_linked_list_iterator_t it; 667 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 668 while (btstack_linked_list_iterator_has_next(&it)){ 669 gatt_client_t * client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 670 if (client->state == P_READY){ 671 // call callback 672 btstack_context_callback_registration_t * callback = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->query_requests); 673 if (callback == NULL) { 674 return; 675 } 676 (*callback->callback)(callback->context); 677 } 678 } 679 return; 680 } 681 #endif 682 683 while (gatt_client->state == P_READY){ 684 #ifdef ENABLE_GATT_OVER_EATT 685 bool query_sent = gatt_client_le_enhanced_handle_can_send_query(gatt_client); 686 if (query_sent){ 687 continue; 688 } 689 #endif 690 btstack_context_callback_registration_t * callback = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->query_requests); 691 if (callback == NULL) { 692 return; 693 } 694 (*callback->callback)(callback->context); 695 } 696 } 697 698 // test if notification/indication should be delivered to application (BLESA) 699 static bool gatt_client_accept_server_message(gatt_client_t *gatt_client) { 700 // ignore messages until re-encryption is complete 701 if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return false; 702 703 // after that ignore if bonded but not encrypted 704 return !gap_bonded(gatt_client->con_handle) || (gap_encryption_key_size(gatt_client->con_handle) > 0); 705 } 706 707 static void emit_event_new(btstack_packet_handler_t callback, uint8_t * packet, uint16_t size){ 708 if (!callback) return; 709 hci_dump_packet(HCI_EVENT_PACKET, 1, packet, size); 710 (*callback)(HCI_EVENT_PACKET, 0, packet, size); 711 } 712 713 static void emit_event_to_registered_listeners(hci_con_handle_t con_handle, uint16_t attribute_handle, uint8_t * packet, uint16_t size){ 714 btstack_linked_list_iterator_t it; 715 btstack_linked_list_iterator_init(&it, &gatt_client_value_listeners); 716 while (btstack_linked_list_iterator_has_next(&it)){ 717 gatt_client_notification_t * notification = (gatt_client_notification_t*) btstack_linked_list_iterator_next(&it); 718 if ((notification->con_handle != GATT_CLIENT_ANY_CONNECTION) && (notification->con_handle != con_handle)) continue; 719 if ((notification->attribute_handle != GATT_CLIENT_ANY_VALUE_HANDLE) && (notification->attribute_handle != attribute_handle)) continue; 720 (*notification->callback)(HCI_EVENT_PACKET, 0, packet, size); 721 } 722 } 723 724 static void emit_gatt_complete_event(gatt_client_t * gatt_client, uint8_t att_status){ 725 // @format H1 726 uint8_t packet[5]; 727 packet[0] = GATT_EVENT_QUERY_COMPLETE; 728 packet[1] = 3; 729 little_endian_store_16(packet, 2, gatt_client->con_handle); 730 packet[4] = att_status; 731 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 732 } 733 734 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){ 735 // @format HX 736 uint8_t packet[24]; 737 packet[0] = GATT_EVENT_SERVICE_QUERY_RESULT; 738 packet[1] = sizeof(packet) - 2u; 739 little_endian_store_16(packet, 2, gatt_client->con_handle); 740 /// 741 little_endian_store_16(packet, 4, start_group_handle); 742 little_endian_store_16(packet, 6, end_group_handle); 743 reverse_128(uuid128, &packet[8]); 744 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 745 } 746 747 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){ 748 // @format HX 749 uint8_t packet[26]; 750 packet[0] = GATT_EVENT_INCLUDED_SERVICE_QUERY_RESULT; 751 packet[1] = sizeof(packet) - 2u; 752 little_endian_store_16(packet, 2, gatt_client->con_handle); 753 /// 754 little_endian_store_16(packet, 4, include_handle); 755 // 756 little_endian_store_16(packet, 6, start_group_handle); 757 little_endian_store_16(packet, 8, end_group_handle); 758 reverse_128(uuid128, &packet[10]); 759 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 760 } 761 762 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, 763 uint16_t properties, const uint8_t * uuid128){ 764 // @format HY 765 uint8_t packet[28]; 766 packet[0] = GATT_EVENT_CHARACTERISTIC_QUERY_RESULT; 767 packet[1] = sizeof(packet) - 2u; 768 little_endian_store_16(packet, 2, gatt_client->con_handle); 769 /// 770 little_endian_store_16(packet, 4, start_handle); 771 little_endian_store_16(packet, 6, value_handle); 772 little_endian_store_16(packet, 8, end_handle); 773 little_endian_store_16(packet, 10, properties); 774 reverse_128(uuid128, &packet[12]); 775 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 776 } 777 778 static void emit_gatt_all_characteristic_descriptors_result_event( 779 gatt_client_t * gatt_client, uint16_t descriptor_handle, const uint8_t * uuid128){ 780 // @format HZ 781 uint8_t packet[22]; 782 packet[0] = GATT_EVENT_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT; 783 packet[1] = sizeof(packet) - 2u; 784 little_endian_store_16(packet, 2, gatt_client->con_handle); 785 /// 786 little_endian_store_16(packet, 4, descriptor_handle); 787 reverse_128(uuid128, &packet[6]); 788 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 789 } 790 791 static void emit_gatt_mtu_exchanged_result_event(gatt_client_t * gatt_client, uint16_t new_mtu){ 792 // @format H2 793 uint8_t packet[6]; 794 packet[0] = GATT_EVENT_MTU; 795 packet[1] = sizeof(packet) - 2u; 796 little_endian_store_16(packet, 2, gatt_client->con_handle); 797 little_endian_store_16(packet, 4, new_mtu); 798 att_dispatch_client_mtu_exchanged(gatt_client->con_handle, new_mtu); 799 emit_event_new(gatt_client->callback, packet, sizeof(packet)); 800 } 801 802 // helper 803 static void gatt_client_handle_transaction_complete(gatt_client_t *gatt_client, uint8_t att_status) { 804 gatt_client->state = P_READY; 805 gatt_client_timeout_stop(gatt_client); 806 emit_gatt_complete_event(gatt_client, att_status); 807 gatt_client_notify_can_send_query(gatt_client); 808 } 809 810 // @return packet pointer 811 // @note assume that value is part of an l2cap buffer - overwrite HCI + L2CAP packet headers 812 #define CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 8 813 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){ 814 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 815 // copy value into test packet for testing 816 static uint8_t packet[1000]; 817 memcpy(&packet[8], value, length); 818 #else 819 // before the value inside the ATT PDU 820 uint8_t * packet = value - CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE; 821 #endif 822 packet[0] = type; 823 packet[1] = CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 2 + length; 824 little_endian_store_16(packet, 2, con_handle); 825 little_endian_store_16(packet, 4, attribute_handle); 826 little_endian_store_16(packet, 6, length); 827 return packet; 828 } 829 830 // @return packet pointer 831 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 832 #define LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 10 833 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){ 834 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 835 // avoid using pre ATT headers. 836 return NULL; 837 #endif 838 #if defined(HCI_INCOMING_PRE_BUFFER_SIZE) && (HCI_INCOMING_PRE_BUFFER_SIZE >= LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 8) // L2CAP Header (4) - ACL Header (4) 839 // before the value inside the ATT PDU 840 uint8_t * packet = value - LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE; 841 packet[0] = type; 842 packet[1] = LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 2 + length; 843 little_endian_store_16(packet, 2, con_handle); 844 little_endian_store_16(packet, 4, attribute_handle); 845 little_endian_store_16(packet, 6, offset); 846 little_endian_store_16(packet, 8, length); 847 return packet; 848 #else 849 log_error("HCI_INCOMING_PRE_BUFFER_SIZE >= 2 required for long characteristic reads"); 850 return NULL; 851 #endif 852 } 853 854 #if (LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE > CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE) 855 #define REPORT_PREBUFFER_HEADER LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 856 #else 857 #define REPORT_PREBUFFER_HEADER CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 858 #endif 859 860 /// 861 static void report_gatt_services(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 862 if (size < 2) return; 863 uint8_t attr_length = packet[1]; 864 uint8_t uuid_length = attr_length - 4u; 865 866 int i; 867 for (i = 2; (i+attr_length) <= size; i += attr_length){ 868 uint16_t start_group_handle = little_endian_read_16(packet,i); 869 uint16_t end_group_handle = little_endian_read_16(packet,i+2); 870 uint8_t uuid128[16]; 871 uint16_t uuid16 = 0; 872 873 if (uuid_length == 2u){ 874 uuid16 = little_endian_read_16(packet, i+4); 875 uuid_add_bluetooth_prefix((uint8_t*) &uuid128, uuid16); 876 } else if (uuid_length == 16u) { 877 reverse_128(&packet[i+4], uuid128); 878 } else { 879 return; 880 } 881 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, uuid128); 882 } 883 } 884 885 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){ 886 uint8_t uuid128[16]; 887 uint16_t uuid16 = 0; 888 if (uuid_length == 2u){ 889 uuid16 = little_endian_read_16(uuid, 0); 890 uuid_add_bluetooth_prefix((uint8_t*) uuid128, uuid16); 891 } else if (uuid_length == 16u){ 892 reverse_128(uuid, uuid128); 893 } else { 894 return; 895 } 896 897 if (gatt_client->filter_with_uuid && (memcmp(gatt_client->uuid128, uuid128, 16) != 0)) return; 898 899 gatt_client->characteristic_properties = properties; 900 gatt_client->characteristic_start_handle = start_handle; 901 gatt_client->attribute_handle = value_handle; 902 903 if (gatt_client->filter_with_uuid) return; 904 905 gatt_client->uuid16 = uuid16; 906 (void)memcpy(gatt_client->uuid128, uuid128, 16); 907 } 908 909 static void report_gatt_characteristic_end_found(gatt_client_t * gatt_client, uint16_t end_handle){ 910 // TODO: stop searching if filter and uuid found 911 912 if (!gatt_client->characteristic_start_handle) return; 913 914 emit_gatt_characteristic_query_result_event(gatt_client, gatt_client->characteristic_start_handle, gatt_client->attribute_handle, 915 end_handle, gatt_client->characteristic_properties, gatt_client->uuid128); 916 917 gatt_client->characteristic_start_handle = 0; 918 } 919 920 921 static void report_gatt_characteristics(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ 922 if (size < 2u) return; 923 uint8_t attr_length = packet[1]; 924 if ((attr_length != 7u) && (attr_length != 21u)) return; 925 uint8_t uuid_length = attr_length - 5u; 926 int i; 927 for (i = 2u; (i + attr_length) <= size; i += attr_length){ 928 uint16_t start_handle = little_endian_read_16(packet, i); 929 uint8_t properties = packet[i+2]; 930 uint16_t value_handle = little_endian_read_16(packet, i+3); 931 report_gatt_characteristic_end_found(gatt_client, start_handle - 1u); 932 report_gatt_characteristic_start_found(gatt_client, start_handle, properties, value_handle, &packet[i + 5], 933 uuid_length); 934 } 935 } 936 937 static void report_gatt_included_service_uuid16(gatt_client_t * gatt_client, uint16_t include_handle, uint16_t uuid16){ 938 uint8_t normalized_uuid128[16]; 939 uuid_add_bluetooth_prefix(normalized_uuid128, uuid16); 940 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 941 gatt_client->query_end_handle, normalized_uuid128); 942 } 943 944 static void report_gatt_included_service_uuid128(gatt_client_t * gatt_client, uint16_t include_handle, const uint8_t * uuid128){ 945 emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, 946 gatt_client->query_end_handle, uuid128); 947 } 948 949 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 950 static void report_gatt_notification(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { 951 if (!gatt_client_accept_server_message(gatt_client)) return; 952 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_NOTIFICATION, gatt_client->con_handle, value_handle, value, length); 953 emit_event_to_registered_listeners(gatt_client->con_handle, value_handle, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 954 } 955 956 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 957 static void report_gatt_indication(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { 958 if (!gatt_client_accept_server_message(gatt_client)) return; 959 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_INDICATION, gatt_client->con_handle, value_handle, value, length); 960 emit_event_to_registered_listeners(gatt_client->con_handle, value_handle, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 961 } 962 963 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 964 static void report_gatt_characteristic_value(gatt_client_t * gatt_client, uint16_t attribute_handle, uint8_t * value, uint16_t length){ 965 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT, gatt_client->con_handle, attribute_handle, value, length); 966 emit_event_new(gatt_client->callback, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); 967 } 968 969 // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes 970 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){ 971 uint8_t * packet = setup_long_characteristic_value_packet(GATT_EVENT_LONG_CHARACTERISTIC_VALUE_QUERY_RESULT, gatt_client->con_handle, attribute_handle, value_offset, blob, blob_length); 972 if (!packet) return; 973 emit_event_new(gatt_client->callback, packet, blob_length + LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE); 974 } 975 976 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){ 977 UNUSED(value_offset); 978 uint8_t * packet = setup_characteristic_value_packet(GATT_EVENT_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, gatt_client->con_handle, descriptor_handle, value, value_length); 979 emit_event_new(gatt_client->callback, packet, value_length + 8u); 980 } 981 982 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){ 983 uint8_t * packet = setup_long_characteristic_value_packet(GATT_EVENT_LONG_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, gatt_client->con_handle, descriptor_handle, value_offset, blob, blob_length); 984 if (!packet) return; 985 emit_event_new(gatt_client->callback, packet, blob_length + LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE); 986 } 987 988 static void report_gatt_all_characteristic_descriptors(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size, uint16_t pair_size){ 989 int i; 990 for (i = 0u; (i + pair_size) <= size; i += pair_size){ 991 uint16_t descriptor_handle = little_endian_read_16(packet,i); 992 uint8_t uuid128[16]; 993 uint16_t uuid16 = 0; 994 if (pair_size == 4u){ 995 uuid16 = little_endian_read_16(packet,i+2); 996 uuid_add_bluetooth_prefix(uuid128, uuid16); 997 } else { 998 reverse_128(&packet[i+2], uuid128); 999 } 1000 emit_gatt_all_characteristic_descriptors_result_event(gatt_client, descriptor_handle, uuid128); 1001 } 1002 1003 } 1004 1005 static int is_query_done(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1006 return last_result_handle >= gatt_client->end_group_handle; 1007 } 1008 1009 static void trigger_next_query(gatt_client_t * gatt_client, uint16_t last_result_handle, gatt_client_state_t next_query_state){ 1010 if (is_query_done(gatt_client, last_result_handle)){ 1011 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1012 return; 1013 } 1014 // next 1015 gatt_client->start_group_handle = last_result_handle + 1u; 1016 gatt_client->state = next_query_state; 1017 } 1018 1019 static void trigger_next_included_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1020 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_INCLUDED_SERVICE_QUERY); 1021 } 1022 1023 static void trigger_next_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1024 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_QUERY); 1025 } 1026 1027 static void trigger_next_service_by_uuid_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1028 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_WITH_UUID_QUERY); 1029 } 1030 1031 static void trigger_next_characteristic_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1032 if (is_query_done(gatt_client, last_result_handle)){ 1033 // report last characteristic 1034 report_gatt_characteristic_end_found(gatt_client, gatt_client->end_group_handle); 1035 } 1036 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY); 1037 } 1038 1039 static void trigger_next_characteristic_descriptor_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1040 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY); 1041 } 1042 1043 static void trigger_next_read_by_type_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ 1044 trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_READ_BY_TYPE_REQUEST); 1045 } 1046 1047 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){ 1048 gatt_client->attribute_offset += write_blob_length(gatt_client); 1049 uint16_t next_blob_length = write_blob_length(gatt_client); 1050 1051 if (next_blob_length == 0u){ 1052 gatt_client->state = done_state; 1053 return; 1054 } 1055 gatt_client->state = next_query_state; 1056 } 1057 1058 static void trigger_next_blob_query(gatt_client_t * gatt_client, gatt_client_state_t next_query_state, uint16_t received_blob_length){ 1059 1060 uint16_t max_blob_length = gatt_client->mtu - 1u; 1061 if (received_blob_length < max_blob_length){ 1062 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1063 return; 1064 } 1065 1066 gatt_client->attribute_offset += received_blob_length; 1067 gatt_client->state = next_query_state; 1068 } 1069 1070 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){ 1071 notification->callback = callback; 1072 notification->con_handle = con_handle; 1073 if (characteristic == NULL){ 1074 notification->attribute_handle = GATT_CLIENT_ANY_VALUE_HANDLE; 1075 } else { 1076 notification->attribute_handle = characteristic->value_handle; 1077 } 1078 btstack_linked_list_add(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 1079 } 1080 1081 void gatt_client_stop_listening_for_characteristic_value_updates(gatt_client_notification_t * notification){ 1082 btstack_linked_list_remove(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); 1083 } 1084 1085 static int is_value_valid(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size){ 1086 uint16_t attribute_handle = little_endian_read_16(packet, 1); 1087 uint16_t value_offset = little_endian_read_16(packet, 3); 1088 1089 if (gatt_client->attribute_handle != attribute_handle) return 0; 1090 if (gatt_client->attribute_offset != value_offset) return 0; 1091 return memcmp(&gatt_client->attribute_value[gatt_client->attribute_offset], &packet[5], size - 5u) == 0u; 1092 } 1093 1094 #ifdef ENABLE_LE_SIGNED_WRITE 1095 static void gatt_client_run_for_client_start_signed_write(gatt_client_t *gatt_client) { 1096 sm_key_t csrk; 1097 le_device_db_local_csrk_get(gatt_client->le_device_index, csrk); 1098 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 1099 gatt_client->state = P_W4_CMAC_RESULT; 1100 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); 1101 } 1102 #endif 1103 1104 // returns true if packet was sent 1105 static bool gatt_client_run_for_gatt_client(gatt_client_t * gatt_client){ 1106 1107 // wait until re-encryption is complete 1108 if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return false; 1109 1110 // wait until re-encryption is complete 1111 if (gatt_client->reencryption_active) return false; 1112 1113 // wait until pairing complete (either reactive authentication or due to required security level) 1114 if (gatt_client->wait_for_authentication_complete) return false; 1115 1116 bool client_request_pending = gatt_client->state != P_READY; 1117 1118 // verify security level for Mandatory Authentication over LE 1119 bool check_security; 1120 switch (gatt_client->bearer_type){ 1121 case ATT_BEARER_UNENHANCED_LE: 1122 check_security = true; 1123 break; 1124 default: 1125 check_security = false; 1126 break; 1127 } 1128 if (client_request_pending && (gatt_client_required_security_level > gatt_client->security_level) && check_security){ 1129 log_info("Trigger pairing, current security level %u, required %u\n", gatt_client->security_level, gatt_client_required_security_level); 1130 gatt_client->wait_for_authentication_complete = 1; 1131 // set att error code for pairing failure based on required level 1132 switch (gatt_client_required_security_level){ 1133 case LEVEL_4: 1134 case LEVEL_3: 1135 gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_AUTHENTICATION; 1136 break; 1137 default: 1138 gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_ENCRYPTION; 1139 break; 1140 } 1141 sm_request_pairing(gatt_client->con_handle); 1142 // sm probably just sent a pdu 1143 return true; 1144 } 1145 1146 switch (gatt_client->mtu_state) { 1147 case SEND_MTU_EXCHANGE: 1148 gatt_client->mtu_state = SENT_MTU_EXCHANGE; 1149 att_exchange_mtu_request(gatt_client); 1150 return true; 1151 case SENT_MTU_EXCHANGE: 1152 return false; 1153 default: 1154 break; 1155 } 1156 1157 if (gatt_client->send_confirmation){ 1158 gatt_client->send_confirmation = 0; 1159 att_confirmation(gatt_client); 1160 return true; 1161 } 1162 1163 // check MTU for writes 1164 switch (gatt_client->state){ 1165 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 1166 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 1167 if (gatt_client->attribute_length <= (gatt_client->mtu - 3u)) break; 1168 log_error("gatt_client_run: value len %u > MTU %u - 3\n", gatt_client->attribute_length,gatt_client->mtu); 1169 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH); 1170 return false; 1171 default: 1172 break; 1173 } 1174 1175 bool packet_sent = true; 1176 bool done = true; 1177 switch (gatt_client->state){ 1178 case P_W2_SEND_SERVICE_QUERY: 1179 gatt_client->state = P_W4_SERVICE_QUERY_RESULT; 1180 send_gatt_services_request(gatt_client); 1181 break; 1182 1183 case P_W2_SEND_SERVICE_WITH_UUID_QUERY: 1184 gatt_client->state = P_W4_SERVICE_WITH_UUID_RESULT; 1185 send_gatt_services_by_uuid_request(gatt_client); 1186 break; 1187 1188 case P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY: 1189 gatt_client->state = P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT; 1190 send_gatt_characteristic_request(gatt_client); 1191 break; 1192 1193 case P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY: 1194 gatt_client->state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 1195 send_gatt_characteristic_request(gatt_client); 1196 break; 1197 1198 case P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY: 1199 gatt_client->state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; 1200 send_gatt_characteristic_descriptor_request(gatt_client); 1201 break; 1202 1203 case P_W2_SEND_INCLUDED_SERVICE_QUERY: 1204 gatt_client->state = P_W4_INCLUDED_SERVICE_QUERY_RESULT; 1205 send_gatt_included_service_request(gatt_client); 1206 break; 1207 1208 case P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY: 1209 gatt_client->state = P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT; 1210 send_gatt_included_service_uuid_request(gatt_client); 1211 break; 1212 1213 case P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY: 1214 gatt_client->state = P_W4_READ_CHARACTERISTIC_VALUE_RESULT; 1215 send_gatt_read_characteristic_value_request(gatt_client); 1216 break; 1217 1218 case P_W2_SEND_READ_BLOB_QUERY: 1219 gatt_client->state = P_W4_READ_BLOB_RESULT; 1220 send_gatt_read_blob_request(gatt_client); 1221 break; 1222 1223 case P_W2_SEND_READ_BY_TYPE_REQUEST: 1224 gatt_client->state = P_W4_READ_BY_TYPE_RESPONSE; 1225 send_gatt_read_by_type_request(gatt_client); 1226 break; 1227 1228 case P_W2_SEND_READ_MULTIPLE_REQUEST: 1229 gatt_client->state = P_W4_READ_MULTIPLE_RESPONSE; 1230 send_gatt_read_multiple_request(gatt_client); 1231 break; 1232 1233 #ifdef ENABLE_GATT_OVER_EATT 1234 case P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST: 1235 gatt_client->state = P_W4_READ_MULTIPLE_VARIABLE_RESPONSE; 1236 send_gatt_read_multiple_variable_request(gatt_client); 1237 break; 1238 #endif 1239 1240 case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: 1241 gatt_client->state = P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT; 1242 send_gatt_write_attribute_value_request(gatt_client); 1243 break; 1244 1245 case P_W2_PREPARE_WRITE: 1246 gatt_client->state = P_W4_PREPARE_WRITE_RESULT; 1247 send_gatt_prepare_write_request(gatt_client); 1248 break; 1249 1250 case P_W2_PREPARE_WRITE_SINGLE: 1251 gatt_client->state = P_W4_PREPARE_WRITE_SINGLE_RESULT; 1252 send_gatt_prepare_write_request(gatt_client); 1253 break; 1254 1255 case P_W2_PREPARE_RELIABLE_WRITE: 1256 gatt_client->state = P_W4_PREPARE_RELIABLE_WRITE_RESULT; 1257 send_gatt_prepare_write_request(gatt_client); 1258 break; 1259 1260 case P_W2_EXECUTE_PREPARED_WRITE: 1261 gatt_client->state = P_W4_EXECUTE_PREPARED_WRITE_RESULT; 1262 send_gatt_execute_write_request(gatt_client); 1263 break; 1264 1265 case P_W2_CANCEL_PREPARED_WRITE: 1266 gatt_client->state = P_W4_CANCEL_PREPARED_WRITE_RESULT; 1267 send_gatt_cancel_prepared_write_request(gatt_client); 1268 break; 1269 1270 case P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH: 1271 gatt_client->state = P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT; 1272 send_gatt_cancel_prepared_write_request(gatt_client); 1273 break; 1274 1275 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1276 case P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 1277 // use Find Information 1278 gatt_client->gatt_client_state = P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1279 send_gatt_characteristic_descriptor_request(gatt_client); 1280 #else 1281 case P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: 1282 // Use Read By Type 1283 gatt_client->state = P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; 1284 send_gatt_read_client_characteristic_configuration_request(gatt_client); 1285 #endif 1286 break; 1287 1288 case P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY: 1289 gatt_client->state = P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT; 1290 send_gatt_read_characteristic_descriptor_request(gatt_client); 1291 break; 1292 1293 case P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY: 1294 gatt_client->state = P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT; 1295 send_gatt_read_blob_request(gatt_client); 1296 break; 1297 1298 case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: 1299 gatt_client->state = P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1300 send_gatt_write_attribute_value_request(gatt_client); 1301 break; 1302 1303 case P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION: 1304 gatt_client->state = P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT; 1305 send_gatt_write_client_characteristic_configuration_request(gatt_client); 1306 break; 1307 1308 case P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR: 1309 gatt_client->state = P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1310 send_gatt_prepare_write_request(gatt_client); 1311 break; 1312 1313 case P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR: 1314 gatt_client->state = P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; 1315 send_gatt_execute_write_request(gatt_client); 1316 break; 1317 1318 #ifdef ENABLE_LE_SIGNED_WRITE 1319 case P_W4_IDENTITY_RESOLVING: 1320 log_info("P_W4_IDENTITY_RESOLVING - state %x", sm_identity_resolving_state(gatt_client->con_handle)); 1321 switch (sm_identity_resolving_state(gatt_client->con_handle)){ 1322 case IRK_LOOKUP_SUCCEEDED: 1323 gatt_client->le_device_index = sm_le_device_index(gatt_client->con_handle); 1324 gatt_client->state = P_W4_CMAC_READY; 1325 if (sm_cmac_ready()){ 1326 gatt_client_run_for_client_start_signed_write(gatt_client); 1327 } 1328 break; 1329 case IRK_LOOKUP_FAILED: 1330 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1331 break; 1332 default: 1333 break; 1334 } 1335 packet_sent = false; 1336 break; 1337 1338 case P_W4_CMAC_READY: 1339 if (sm_cmac_ready()){ 1340 gatt_client_run_for_client_start_signed_write(gatt_client); 1341 } 1342 packet_sent = false; 1343 break; 1344 1345 case P_W2_SEND_SIGNED_WRITE: { 1346 gatt_client->state = P_W4_SEND_SINGED_WRITE_DONE; 1347 // bump local signing counter 1348 uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); 1349 le_device_db_local_counter_set(gatt_client->le_device_index, sign_counter + 1); 1350 // send signed write command 1351 send_gatt_signed_write_request(gatt_client, sign_counter); 1352 // finally, notifiy client that write is complete 1353 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1354 break; 1355 } 1356 #endif 1357 default: 1358 done = false; 1359 break; 1360 } 1361 1362 if (done){ 1363 return packet_sent; 1364 } 1365 1366 // write without response callback 1367 btstack_context_callback_registration_t * callback = 1368 (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->write_without_response_requests); 1369 if (callback != NULL){ 1370 (*callback->callback)(callback->context); 1371 return true; 1372 } 1373 1374 // requested can send now old 1375 if (gatt_client->write_without_response_callback){ 1376 btstack_packet_handler_t packet_handler = gatt_client->write_without_response_callback; 1377 gatt_client->write_without_response_callback = NULL; 1378 uint8_t event[4]; 1379 event[0] = GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE; 1380 event[1] = sizeof(event) - 2u; 1381 little_endian_store_16(event, 2, gatt_client->con_handle); 1382 packet_handler(HCI_EVENT_PACKET, gatt_client->con_handle, event, sizeof(event)); 1383 return true; // to trigger requeueing (even if higher layer didn't sent) 1384 } 1385 1386 return false; 1387 } 1388 1389 static void gatt_client_run(void){ 1390 btstack_linked_item_t *it; 1391 bool packet_sent; 1392 #ifdef ENABLE_GATT_OVER_EATT 1393 btstack_linked_list_iterator_t it_eatt; 1394 #endif 1395 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 1396 gatt_client_t * gatt_client = (gatt_client_t *) it; 1397 switch (gatt_client->bearer_type){ 1398 case ATT_BEARER_UNENHANCED_LE: 1399 #ifdef ENABLE_GATT_OVER_EATT 1400 btstack_linked_list_iterator_init(&it_eatt, &gatt_client->eatt_clients); 1401 while (btstack_linked_list_iterator_has_next(&it_eatt)) { 1402 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it_eatt); 1403 if (eatt_client->state != P_READY){ 1404 if (att_dispatch_client_can_send_now(gatt_client->con_handle)){ 1405 gatt_client_run_for_gatt_client(eatt_client); 1406 } 1407 } 1408 } 1409 #endif 1410 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) { 1411 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1412 return; 1413 } 1414 packet_sent = gatt_client_run_for_gatt_client(gatt_client); 1415 if (packet_sent){ 1416 // request new permission 1417 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1418 // requeue client for fairness and exit 1419 // note: iterator has become invalid 1420 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1421 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1422 return; 1423 } 1424 break; 1425 #ifdef ENABLE_GATT_OVER_CLASSIC 1426 case ATT_BEARER_UNENHANCED_CLASSIC: 1427 if (gatt_client->con_handle == HCI_CON_HANDLE_INVALID) { 1428 continue; 1429 } 1430 1431 // handle GATT over BR/EDR 1432 if (att_dispatch_client_can_send_now(gatt_client->con_handle) == false) { 1433 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1434 return; 1435 } 1436 packet_sent = gatt_client_run_for_gatt_client(gatt_client); 1437 if (packet_sent){ 1438 // request new permission 1439 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 1440 // requeue client for fairness and exit 1441 // note: iterator has become invalid 1442 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1443 btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1444 return; 1445 } 1446 break; 1447 #endif 1448 default: 1449 btstack_unreachable(); 1450 break; 1451 } 1452 1453 1454 } 1455 } 1456 1457 static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code) { 1458 if (is_ready(gatt_client) == 1) return; 1459 gatt_client_handle_transaction_complete(gatt_client, att_error_code); 1460 } 1461 1462 static void gatt_client_handle_reencryption_complete(const uint8_t * packet){ 1463 hci_con_handle_t con_handle = sm_event_reencryption_complete_get_handle(packet); 1464 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 1465 if (gatt_client == NULL) return; 1466 1467 // update security level 1468 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 1469 1470 gatt_client->reencryption_result = sm_event_reencryption_complete_get_status(packet); 1471 gatt_client->reencryption_active = false; 1472 gatt_client->wait_for_authentication_complete = 0; 1473 1474 if (gatt_client->state == P_READY) return; 1475 1476 switch (sm_event_reencryption_complete_get_status(packet)){ 1477 case ERROR_CODE_SUCCESS: 1478 log_info("re-encryption success, retry operation"); 1479 break; 1480 case ERROR_CODE_AUTHENTICATION_FAILURE: 1481 case ERROR_CODE_PIN_OR_KEY_MISSING: 1482 #if defined(ENABLE_GATT_CLIENT_PAIRING) && !defined(ENABLE_LE_PROACTIVE_AUTHENTICATION) 1483 if (gatt_client_required_security_level == LEVEL_0) { 1484 // re-encryption failed for reactive authentication with pairing and we have a pending client request 1485 // => try to resolve it by deleting bonding information if we started pairing before 1486 // delete bonding information 1487 int le_device_db_index = sm_le_device_index(gatt_client->con_handle); 1488 btstack_assert(le_device_db_index >= 0); 1489 log_info("reactive auth with pairing: delete bonding and start pairing"); 1490 #ifdef ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION 1491 hci_remove_le_device_db_entry_from_resolving_list((uint16_t) le_device_db_index); 1492 #endif 1493 le_device_db_remove(le_device_db_index); 1494 // trigger pairing again 1495 sm_request_pairing(gatt_client->con_handle); 1496 break; 1497 } 1498 #endif 1499 // report bonding information missing 1500 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); 1501 break; 1502 default: 1503 // report bonding information missing 1504 gatt_client_handle_transaction_complete(gatt_client, gatt_client->pending_error_code); 1505 break; 1506 } 1507 } 1508 1509 static void gatt_client_handle_disconnection_complete(const uint8_t * packet){ 1510 log_info("GATT Client: HCI_EVENT_DISCONNECTION_COMPLETE"); 1511 hci_con_handle_t con_handle = little_endian_read_16(packet,3); 1512 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 1513 if (gatt_client == NULL) return; 1514 1515 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 1516 gatt_client_timeout_stop(gatt_client); 1517 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 1518 btstack_memory_gatt_client_free(gatt_client); 1519 } 1520 1521 static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1522 UNUSED(channel); // ok: handling own l2cap events 1523 UNUSED(size); // ok: there is no channel 1524 1525 if (packet_type != HCI_EVENT_PACKET) return; 1526 1527 hci_con_handle_t con_handle; 1528 gatt_client_t * gatt_client; 1529 switch (hci_event_packet_get_type(packet)) { 1530 case HCI_EVENT_DISCONNECTION_COMPLETE: 1531 gatt_client_handle_disconnection_complete(packet); 1532 break; 1533 1534 // Pairing complete (with/without bonding=storing of pairing information) 1535 case SM_EVENT_PAIRING_COMPLETE: 1536 con_handle = sm_event_pairing_complete_get_handle(packet); 1537 gatt_client = gatt_client_get_context_for_handle(con_handle); 1538 if (gatt_client == NULL) break; 1539 1540 // update security level 1541 gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); 1542 1543 if (gatt_client->wait_for_authentication_complete){ 1544 gatt_client->wait_for_authentication_complete = 0; 1545 if (sm_event_pairing_complete_get_status(packet)){ 1546 log_info("pairing failed, report previous error 0x%x", gatt_client->pending_error_code); 1547 gatt_client_report_error_if_pending(gatt_client, gatt_client->pending_error_code); 1548 } else { 1549 log_info("pairing success, retry operation"); 1550 } 1551 } 1552 break; 1553 1554 #ifdef ENABLE_LE_SIGNED_WRITE 1555 // Identity Resolving completed (no code, gatt_client_run will continue) 1556 case SM_EVENT_IDENTITY_RESOLVING_SUCCEEDED: 1557 case SM_EVENT_IDENTITY_RESOLVING_FAILED: 1558 break; 1559 #endif 1560 1561 // re-encryption started 1562 case SM_EVENT_REENCRYPTION_STARTED: 1563 con_handle = sm_event_reencryption_complete_get_handle(packet); 1564 gatt_client = gatt_client_get_context_for_handle(con_handle); 1565 if (gatt_client == NULL) break; 1566 1567 gatt_client->reencryption_active = true; 1568 gatt_client->reencryption_result = ERROR_CODE_SUCCESS; 1569 break; 1570 1571 // re-encryption complete 1572 case SM_EVENT_REENCRYPTION_COMPLETE: 1573 gatt_client_handle_reencryption_complete(packet); 1574 break; 1575 default: 1576 break; 1577 } 1578 1579 gatt_client_run(); 1580 } 1581 1582 static void gatt_client_handle_att_read_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { 1583 switch (gatt_client->state) { 1584 case P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT: 1585 if (size >= 17) { 1586 uint8_t uuid128[16]; 1587 reverse_128(&packet[1], uuid128); 1588 report_gatt_included_service_uuid128(gatt_client, gatt_client->start_group_handle, uuid128); 1589 } 1590 trigger_next_included_service_query(gatt_client, gatt_client->start_group_handle); 1591 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1592 break; 1593 1594 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 1595 report_gatt_characteristic_value(gatt_client, gatt_client->attribute_handle, &packet[1], size - 1u); 1596 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1597 break; 1598 1599 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: 1600 report_gatt_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], 1601 size - 1u, 0u); 1602 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1603 break; 1604 1605 // Use ATT_READ_REQUEST for first blob of Read Long Characteristic 1606 case P_W4_READ_BLOB_RESULT: 1607 report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], 1608 size - 1u, gatt_client->attribute_offset); 1609 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, size - 1u); 1610 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1611 break; 1612 1613 // Use ATT_READ_REQUEST for first blob of Read Long Characteristic Descriptor 1614 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 1615 report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], 1616 size - 1u, gatt_client->attribute_offset); 1617 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, 1618 size - 1u); 1619 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1620 break; 1621 1622 default: 1623 break; 1624 } 1625 } 1626 1627 static void gatt_client_handle_att_read_by_type_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { 1628 switch (gatt_client->state) { 1629 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 1630 report_gatt_characteristics(gatt_client, packet, size); 1631 trigger_next_characteristic_query(gatt_client, 1632 get_last_result_handle_from_characteristics_list(packet, size)); 1633 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1634 break; 1635 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 1636 report_gatt_characteristics(gatt_client, packet, size); 1637 trigger_next_characteristic_query(gatt_client, 1638 get_last_result_handle_from_characteristics_list(packet, size)); 1639 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR 1640 break; 1641 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: { 1642 if (size < 2u) break; 1643 uint16_t uuid16 = 0; 1644 uint16_t pair_size = packet[1]; 1645 1646 if (pair_size == 6u) { 1647 if (size < 8u) break; 1648 // UUIDs not available, query first included service 1649 gatt_client->start_group_handle = little_endian_read_16(packet, 2); // ready for next query 1650 gatt_client->query_start_handle = little_endian_read_16(packet, 4); 1651 gatt_client->query_end_handle = little_endian_read_16(packet, 6); 1652 gatt_client->state = P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY; 1653 break; 1654 } 1655 1656 if (pair_size != 8u) break; 1657 1658 // UUIDs included, report all of them 1659 uint16_t offset; 1660 for (offset = 2u; (offset + 8u) <= size; offset += pair_size) { 1661 uint16_t include_handle = little_endian_read_16(packet, offset); 1662 gatt_client->query_start_handle = little_endian_read_16(packet, offset + 2u); 1663 gatt_client->query_end_handle = little_endian_read_16(packet, offset + 4u); 1664 uuid16 = little_endian_read_16(packet, offset + 6u); 1665 report_gatt_included_service_uuid16(gatt_client, include_handle, uuid16); 1666 } 1667 1668 trigger_next_included_service_query(gatt_client, 1669 get_last_result_handle_from_included_services_list(packet, 1670 size)); 1671 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1672 break; 1673 } 1674 #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1675 case P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT: 1676 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, 2); 1677 gatt_client->state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 1678 break; 1679 #endif 1680 case P_W4_READ_BY_TYPE_RESPONSE: { 1681 uint16_t pair_size = packet[1]; 1682 // set last result handle to last valid handle, only used if pair_size invalid 1683 uint16_t last_result_handle = 0xffff; 1684 if (pair_size > 2) { 1685 uint16_t offset; 1686 for (offset = 2; offset < size; offset += pair_size) { 1687 uint16_t value_handle = little_endian_read_16(packet, offset); 1688 report_gatt_characteristic_value(gatt_client, value_handle, &packet[offset + 2u], 1689 pair_size - 2u); 1690 last_result_handle = value_handle; 1691 } 1692 } 1693 trigger_next_read_by_type_query(gatt_client, last_result_handle); 1694 break; 1695 } 1696 default: 1697 break; 1698 } 1699 } 1700 1701 static void gatt_client_handle_att_write_response(gatt_client_t *gatt_client) { 1702 switch (gatt_client->state) { 1703 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 1704 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1705 break; 1706 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 1707 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1708 break; 1709 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1710 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1711 break; 1712 default: 1713 break; 1714 } 1715 } 1716 1717 static void gatt_client_handle_att_response(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size) { 1718 uint8_t att_status; 1719 switch (packet[0]) { 1720 case ATT_EXCHANGE_MTU_RESPONSE: { 1721 if (size < 3u) break; 1722 bool update_gatt_server_att_mtu = false; 1723 uint16_t remote_rx_mtu = little_endian_read_16(packet, 1); 1724 uint16_t local_rx_mtu = l2cap_max_le_mtu(); 1725 switch (gatt_client->bearer_type){ 1726 case ATT_BEARER_UNENHANCED_LE: 1727 update_gatt_server_att_mtu = true; 1728 break; 1729 #ifdef ENABLE_GATT_OVER_CLASSIC 1730 case ATT_BEARER_UNENHANCED_CLASSIC: 1731 local_rx_mtu = gatt_client->mtu; 1732 break; 1733 #endif 1734 default: 1735 btstack_unreachable(); 1736 break; 1737 } 1738 1739 uint16_t mtu = (remote_rx_mtu < local_rx_mtu) ? remote_rx_mtu : local_rx_mtu; 1740 1741 // set gatt client mtu 1742 gatt_client->mtu = mtu; 1743 gatt_client->mtu_state = MTU_EXCHANGED; 1744 1745 if (update_gatt_server_att_mtu){ 1746 // set per connection mtu state - for fixed channel 1747 hci_connection_t *hci_connection = hci_connection_for_handle(gatt_client->con_handle); 1748 hci_connection->att_connection.mtu = gatt_client->mtu; 1749 hci_connection->att_connection.mtu_exchanged = true; 1750 } 1751 emit_gatt_mtu_exchanged_result_event(gatt_client, gatt_client->mtu); 1752 break; 1753 } 1754 case ATT_READ_BY_GROUP_TYPE_RESPONSE: 1755 switch (gatt_client->state) { 1756 case P_W4_SERVICE_QUERY_RESULT: 1757 report_gatt_services(gatt_client, packet, size); 1758 trigger_next_service_query(gatt_client, get_last_result_handle_from_service_list(packet, size)); 1759 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1760 break; 1761 default: 1762 break; 1763 } 1764 break; 1765 case ATT_HANDLE_VALUE_NOTIFICATION: 1766 if (size < 3u) return; 1767 report_gatt_notification(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); 1768 return; 1769 #ifdef ENABLE_GATT_OVER_EATT 1770 case ATT_MULTIPLE_HANDLE_VALUE_NTF: 1771 if (size >= 5u) { 1772 uint16_t offset = 1; 1773 while (true){ 1774 uint16_t value_handle = little_endian_read_16(packet, offset); 1775 offset += 2; 1776 uint16_t value_length = little_endian_read_16(packet, offset); 1777 offset += 2; 1778 if ((offset + value_length) > size) break; 1779 report_gatt_notification(gatt_client, value_handle, &packet[offset], value_length); 1780 offset += value_length; 1781 } 1782 } 1783 return; 1784 #endif 1785 case ATT_HANDLE_VALUE_INDICATION: 1786 if (size < 3u) break; 1787 report_gatt_indication(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); 1788 gatt_client->send_confirmation = 1; 1789 break; 1790 case ATT_READ_BY_TYPE_RESPONSE: 1791 gatt_client_handle_att_read_by_type_response(gatt_client, packet, size); 1792 break; 1793 case ATT_READ_RESPONSE: 1794 gatt_client_handle_att_read_response(gatt_client, packet, size); 1795 break; 1796 case ATT_FIND_BY_TYPE_VALUE_RESPONSE: { 1797 uint8_t pair_size = 4; 1798 int i; 1799 uint16_t start_group_handle; 1800 uint16_t end_group_handle = 0xffff; // asserts GATT_EVENT_QUERY_COMPLETE is emitted if no results 1801 for (i = 1u; (i + pair_size) <= size; i += pair_size) { 1802 start_group_handle = little_endian_read_16(packet, i); 1803 end_group_handle = little_endian_read_16(packet, i + 2); 1804 emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, 1805 gatt_client->uuid128); 1806 } 1807 trigger_next_service_by_uuid_query(gatt_client, end_group_handle); 1808 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1809 break; 1810 } 1811 case ATT_FIND_INFORMATION_REPLY: { 1812 if (size < 2u) break; 1813 1814 uint8_t pair_size = 4; 1815 if (packet[1u] == 2u) { 1816 pair_size = 18; 1817 } 1818 uint16_t offset = 2; 1819 1820 if (size < (pair_size + offset)) break; 1821 uint16_t last_descriptor_handle = little_endian_read_16(packet, size - pair_size); 1822 1823 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 1824 log_info("ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY, state %x", gatt_client->gatt_client_state); 1825 if (gatt_client->gatt_client_state == P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT){ 1826 // iterate over descriptors looking for CCC 1827 if (pair_size == 4){ 1828 while ((offset + 4) <= size){ 1829 uint16_t uuid16 = little_endian_read_16(packet, offset + 2); 1830 if (uuid16 == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION){ 1831 gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, offset); 1832 gatt_client->gatt_client_state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 1833 log_info("CCC found %x", gatt_client->client_characteristic_configuration_handle); 1834 break; 1835 } 1836 offset += pair_size; 1837 } 1838 } 1839 if (is_query_done(gatt_client, last_descriptor_handle)){ 1840 1841 } else { 1842 // next 1843 gatt_client->start_group_handle = last_descriptor_handle + 1; 1844 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 1845 } 1846 break; 1847 } 1848 #endif 1849 report_gatt_all_characteristic_descriptors(gatt_client, &packet[2], size - 2u, pair_size); 1850 trigger_next_characteristic_descriptor_query(gatt_client, last_descriptor_handle); 1851 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1852 break; 1853 } 1854 1855 case ATT_WRITE_RESPONSE: 1856 gatt_client_handle_att_write_response(gatt_client); 1857 break; 1858 1859 case ATT_READ_BLOB_RESPONSE: { 1860 uint16_t received_blob_length = size - 1u; 1861 switch (gatt_client->state) { 1862 case P_W4_READ_BLOB_RESULT: 1863 report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], 1864 received_blob_length, gatt_client->attribute_offset); 1865 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, received_blob_length); 1866 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1867 break; 1868 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 1869 report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, 1870 &packet[1], received_blob_length, 1871 gatt_client->attribute_offset); 1872 trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, 1873 received_blob_length); 1874 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1875 break; 1876 default: 1877 break; 1878 } 1879 break; 1880 } 1881 case ATT_PREPARE_WRITE_RESPONSE: 1882 switch (gatt_client->state) { 1883 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 1884 if (is_value_valid(gatt_client, packet, size)) { 1885 att_status = ATT_ERROR_SUCCESS; 1886 } else { 1887 att_status = ATT_ERROR_DATA_MISMATCH; 1888 } 1889 gatt_client_handle_transaction_complete(gatt_client, att_status); 1890 break; 1891 1892 case P_W4_PREPARE_WRITE_RESULT: { 1893 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 1894 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE, P_W2_EXECUTE_PREPARED_WRITE); 1895 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1896 break; 1897 } 1898 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: { 1899 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 1900 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR, 1901 P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR); 1902 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1903 break; 1904 } 1905 case P_W4_PREPARE_RELIABLE_WRITE_RESULT: { 1906 if (is_value_valid(gatt_client, packet, size)) { 1907 gatt_client->attribute_offset = little_endian_read_16(packet, 3); 1908 trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_RELIABLE_WRITE, 1909 P_W2_EXECUTE_PREPARED_WRITE); 1910 // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done 1911 break; 1912 } 1913 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 1914 break; 1915 } 1916 default: 1917 break; 1918 } 1919 break; 1920 1921 case ATT_EXECUTE_WRITE_RESPONSE: 1922 switch (gatt_client->state) { 1923 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 1924 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1925 break; 1926 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 1927 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1928 break; 1929 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 1930 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_DATA_MISMATCH); 1931 break; 1932 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 1933 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1934 break; 1935 default: 1936 break; 1937 1938 } 1939 break; 1940 1941 case ATT_READ_MULTIPLE_RESPONSE: 1942 switch (gatt_client->state) { 1943 case P_W4_READ_MULTIPLE_RESPONSE: 1944 report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); 1945 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1946 break; 1947 default: 1948 break; 1949 } 1950 break; 1951 1952 #ifdef ENABLE_GATT_OVER_EATT 1953 case ATT_READ_MULTIPLE_VARIABLE_RSP: 1954 switch (gatt_client->state) { 1955 case P_W4_READ_MULTIPLE_VARIABLE_RESPONSE: 1956 report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); 1957 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1958 break; 1959 default: 1960 break; 1961 } 1962 break; 1963 #endif 1964 1965 case ATT_ERROR_RESPONSE: 1966 if (size < 5u) return; 1967 att_status = packet[4]; 1968 switch (att_status) { 1969 case ATT_ERROR_ATTRIBUTE_NOT_FOUND: { 1970 switch (gatt_client->state) { 1971 case P_W4_SERVICE_QUERY_RESULT: 1972 case P_W4_SERVICE_WITH_UUID_RESULT: 1973 case P_W4_INCLUDED_SERVICE_QUERY_RESULT: 1974 case P_W4_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT: 1975 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1976 break; 1977 case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: 1978 case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: 1979 report_gatt_characteristic_end_found(gatt_client, gatt_client->end_group_handle); 1980 gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); 1981 break; 1982 case P_W4_READ_BY_TYPE_RESPONSE: 1983 if (gatt_client->start_group_handle == gatt_client->query_start_handle) { 1984 att_status = ATT_ERROR_ATTRIBUTE_NOT_FOUND; 1985 } else { 1986 att_status = ATT_ERROR_SUCCESS; 1987 } 1988 gatt_client_handle_transaction_complete(gatt_client, att_status); 1989 break; 1990 default: 1991 gatt_client_report_error_if_pending(gatt_client, att_status); 1992 break; 1993 } 1994 break; 1995 } 1996 1997 #ifdef ENABLE_GATT_CLIENT_PAIRING 1998 1999 case ATT_ERROR_INSUFFICIENT_AUTHENTICATION: 2000 case ATT_ERROR_INSUFFICIENT_ENCRYPTION_KEY_SIZE: 2001 case ATT_ERROR_INSUFFICIENT_ENCRYPTION: { 2002 2003 // security too low 2004 if (gatt_client->security_counter > 0) { 2005 gatt_client_report_error_if_pending(gatt_client, att_status); 2006 break; 2007 } 2008 // start security 2009 gatt_client->security_counter++; 2010 2011 // setup action 2012 int retry = 1; 2013 switch (gatt_client->state){ 2014 case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: 2015 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY ; 2016 break; 2017 case P_W4_READ_BLOB_RESULT: 2018 gatt_client->state = P_W2_SEND_READ_BLOB_QUERY; 2019 break; 2020 case P_W4_READ_BY_TYPE_RESPONSE: 2021 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2022 break; 2023 case P_W4_READ_MULTIPLE_RESPONSE: 2024 gatt_client->state = P_W2_SEND_READ_MULTIPLE_REQUEST; 2025 break; 2026 case P_W4_READ_MULTIPLE_VARIABLE_RESPONSE: 2027 gatt_client->state = P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST; 2028 break; 2029 case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: 2030 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 2031 break; 2032 case P_W4_PREPARE_WRITE_RESULT: 2033 gatt_client->state = P_W2_PREPARE_WRITE; 2034 break; 2035 case P_W4_PREPARE_WRITE_SINGLE_RESULT: 2036 gatt_client->state = P_W2_PREPARE_WRITE_SINGLE; 2037 break; 2038 case P_W4_PREPARE_RELIABLE_WRITE_RESULT: 2039 gatt_client->state = P_W2_PREPARE_RELIABLE_WRITE; 2040 break; 2041 case P_W4_EXECUTE_PREPARED_WRITE_RESULT: 2042 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE; 2043 break; 2044 case P_W4_CANCEL_PREPARED_WRITE_RESULT: 2045 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE; 2046 break; 2047 case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: 2048 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; 2049 break; 2050 case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: 2051 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 2052 break; 2053 case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: 2054 gatt_client->state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 2055 break; 2056 case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2057 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 2058 break; 2059 case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: 2060 gatt_client->state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; 2061 break; 2062 case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2063 gatt_client->state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 2064 break; 2065 case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: 2066 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR; 2067 break; 2068 #ifdef ENABLE_LE_SIGNED_WRITE 2069 case P_W4_SEND_SINGED_WRITE_DONE: 2070 gatt_client->state = P_W2_SEND_SIGNED_WRITE; 2071 break; 2072 #endif 2073 default: 2074 log_info("retry not supported for state %x", gatt_client->state); 2075 retry = 0; 2076 break; 2077 } 2078 2079 if (!retry) { 2080 gatt_client_report_error_if_pending(gatt_client, att_status); 2081 break; 2082 } 2083 2084 log_info("security error, start pairing"); 2085 2086 // start pairing for higher security level 2087 gatt_client->wait_for_authentication_complete = 1; 2088 gatt_client->pending_error_code = att_status; 2089 sm_request_pairing(gatt_client->con_handle); 2090 break; 2091 } 2092 #endif 2093 2094 // nothing we can do about that 2095 case ATT_ERROR_INSUFFICIENT_AUTHORIZATION: 2096 default: 2097 gatt_client_report_error_if_pending(gatt_client, att_status); 2098 break; 2099 } 2100 break; 2101 2102 default: 2103 log_info("ATT Handler, unhandled response type 0x%02x", packet[0]); 2104 break; 2105 } 2106 } 2107 2108 static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size) { 2109 gatt_client_t *gatt_client; 2110 hci_connection_t * hci_connection; 2111 uint8_t status; 2112 if (size < 1u) return; 2113 switch (packet_type){ 2114 case HCI_EVENT_PACKET: 2115 switch (hci_event_packet_get_type(packet)) { 2116 #ifdef ENABLE_GATT_OVER_CLASSIC 2117 case L2CAP_EVENT_CHANNEL_OPENED: 2118 status = l2cap_event_channel_opened_get_status(packet); 2119 gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_opened_get_local_cid(packet)); 2120 btstack_assert(gatt_client != NULL); 2121 // if status != 0, gatt_client will be discarded 2122 gatt_client->state = P_READY; 2123 gatt_client->con_handle = l2cap_event_channel_opened_get_handle(packet); 2124 gatt_client->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); 2125 gatt_client_classic_handle_connected(gatt_client, status); 2126 break; 2127 case L2CAP_EVENT_CHANNEL_CLOSED: 2128 gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_closed_get_local_cid(packet)); 2129 // clear l2cap cid in hci_connection->att_server 2130 hci_connection = hci_connection_for_handle(gatt_client->con_handle); 2131 hci_connection->att_server.l2cap_cid = 0; 2132 // discard gatt client object 2133 gatt_client_classic_handle_disconnected(gatt_client); 2134 break; 2135 #endif 2136 case L2CAP_EVENT_CAN_SEND_NOW: 2137 gatt_client_run(); 2138 break; 2139 // att_server has negotiated the mtu for this connection, cache if context exists 2140 case ATT_EVENT_MTU_EXCHANGE_COMPLETE: 2141 if (size < 6u) break; 2142 gatt_client = gatt_client_get_context_for_handle(handle); 2143 if (gatt_client == NULL) break; 2144 gatt_client->mtu = little_endian_read_16(packet, 4); 2145 break; 2146 default: 2147 break; 2148 } 2149 break; 2150 2151 case ATT_DATA_PACKET: 2152 // special cases: notifications & indications motivate creating context 2153 switch (packet[0]) { 2154 case ATT_HANDLE_VALUE_NOTIFICATION: 2155 case ATT_HANDLE_VALUE_INDICATION: 2156 gatt_client_provide_context_for_handle(handle, &gatt_client); 2157 break; 2158 default: 2159 gatt_client = gatt_client_get_context_for_handle(handle); 2160 break; 2161 } 2162 2163 if (gatt_client != NULL) { 2164 gatt_client_handle_att_response(gatt_client, packet, size); 2165 gatt_client_run(); 2166 } 2167 break; 2168 2169 #ifdef ENABLE_GATT_OVER_CLASSIC 2170 case L2CAP_DATA_PACKET: 2171 gatt_client = gatt_client_get_context_for_l2cap_cid(handle); 2172 btstack_assert(gatt_client != NULL); 2173 gatt_client_handle_att_response(gatt_client, packet, size); 2174 gatt_client_run(); 2175 break; 2176 #endif 2177 2178 default: 2179 break; 2180 } 2181 } 2182 2183 #ifdef ENABLE_LE_SIGNED_WRITE 2184 static void att_signed_write_handle_cmac_result(uint8_t hash[8]){ 2185 btstack_linked_list_iterator_t it; 2186 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 2187 while (btstack_linked_list_iterator_has_next(&it)){ 2188 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 2189 if (gatt_client->state == P_W4_CMAC_RESULT){ 2190 // store result 2191 (void)memcpy(gatt_client->cmac, hash, 8); 2192 // reverse_64(hash, gatt_client->cmac); 2193 gatt_client->state = P_W2_SEND_SIGNED_WRITE; 2194 gatt_client_run(); 2195 return; 2196 } 2197 } 2198 } 2199 2200 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){ 2201 gatt_client_t * gatt_client; 2202 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2203 if (status != ERROR_CODE_SUCCESS){ 2204 return status; 2205 } 2206 if (is_ready(gatt_client) == 0){ 2207 return GATT_CLIENT_IN_WRONG_STATE; 2208 } 2209 2210 gatt_client->callback = callback; 2211 gatt_client->attribute_handle = value_handle; 2212 gatt_client->attribute_length = message_len; 2213 gatt_client->attribute_value = message; 2214 gatt_client->state = P_W4_IDENTITY_RESOLVING; 2215 gatt_client_run(); 2216 return ERROR_CODE_SUCCESS; 2217 } 2218 #endif 2219 2220 uint8_t gatt_client_discover_primary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2221 gatt_client_t * gatt_client; 2222 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2223 if (status != ERROR_CODE_SUCCESS){ 2224 return status; 2225 } 2226 2227 gatt_client->callback = callback; 2228 gatt_client->start_group_handle = 0x0001; 2229 gatt_client->end_group_handle = 0xffff; 2230 gatt_client->state = P_W2_SEND_SERVICE_QUERY; 2231 gatt_client->uuid16 = GATT_PRIMARY_SERVICE_UUID; 2232 gatt_client_run(); 2233 return ERROR_CODE_SUCCESS; 2234 } 2235 2236 uint8_t gatt_client_discover_secondary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2237 gatt_client_t * gatt_client; 2238 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2239 if (status != ERROR_CODE_SUCCESS){ 2240 return status; 2241 } 2242 2243 gatt_client->callback = callback; 2244 gatt_client->start_group_handle = 0x0001; 2245 gatt_client->end_group_handle = 0xffff; 2246 gatt_client->state = P_W2_SEND_SERVICE_QUERY; 2247 gatt_client->uuid16 = GATT_SECONDARY_SERVICE_UUID; 2248 gatt_client_run(); 2249 return ERROR_CODE_SUCCESS; 2250 } 2251 2252 uint8_t gatt_client_discover_primary_services_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t uuid16){ 2253 gatt_client_t * gatt_client; 2254 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2255 if (status != ERROR_CODE_SUCCESS){ 2256 return status; 2257 } 2258 2259 gatt_client->callback = callback; 2260 gatt_client->start_group_handle = 0x0001; 2261 gatt_client->end_group_handle = 0xffff; 2262 gatt_client->state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 2263 gatt_client->uuid16 = uuid16; 2264 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), gatt_client->uuid16); 2265 gatt_client_run(); 2266 return ERROR_CODE_SUCCESS; 2267 } 2268 2269 uint8_t gatt_client_discover_primary_services_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, const uint8_t * uuid128){ 2270 gatt_client_t * gatt_client; 2271 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2272 if (status != ERROR_CODE_SUCCESS){ 2273 return status; 2274 } 2275 2276 gatt_client->callback = callback; 2277 gatt_client->start_group_handle = 0x0001; 2278 gatt_client->end_group_handle = 0xffff; 2279 gatt_client->uuid16 = 0; 2280 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2281 gatt_client->state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; 2282 gatt_client_run(); 2283 return ERROR_CODE_SUCCESS; 2284 } 2285 2286 uint8_t gatt_client_discover_characteristics_for_service(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service){ 2287 gatt_client_t * gatt_client; 2288 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2289 if (status != ERROR_CODE_SUCCESS){ 2290 return status; 2291 } 2292 2293 gatt_client->callback = callback; 2294 gatt_client->start_group_handle = service->start_group_handle; 2295 gatt_client->end_group_handle = service->end_group_handle; 2296 gatt_client->filter_with_uuid = 0; 2297 gatt_client->characteristic_start_handle = 0; 2298 gatt_client->state = P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY; 2299 gatt_client_run(); 2300 return ERROR_CODE_SUCCESS; 2301 } 2302 2303 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){ 2304 gatt_client_t * gatt_client; 2305 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2306 if (status != ERROR_CODE_SUCCESS){ 2307 return status; 2308 } 2309 2310 gatt_client->callback = callback; 2311 gatt_client->start_group_handle = service->start_group_handle; 2312 gatt_client->end_group_handle = service->end_group_handle; 2313 gatt_client->state = P_W2_SEND_INCLUDED_SERVICE_QUERY; 2314 2315 gatt_client_run(); 2316 return ERROR_CODE_SUCCESS; 2317 } 2318 2319 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){ 2320 gatt_client_t * gatt_client; 2321 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2322 if (status != ERROR_CODE_SUCCESS){ 2323 return status; 2324 } 2325 2326 gatt_client->callback = callback; 2327 gatt_client->start_group_handle = start_handle; 2328 gatt_client->end_group_handle = end_handle; 2329 gatt_client->filter_with_uuid = 1; 2330 gatt_client->uuid16 = uuid16; 2331 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 2332 gatt_client->characteristic_start_handle = 0; 2333 gatt_client->state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 2334 gatt_client_run(); 2335 return ERROR_CODE_SUCCESS; 2336 } 2337 2338 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){ 2339 gatt_client_t * gatt_client; 2340 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2341 if (status != ERROR_CODE_SUCCESS){ 2342 return status; 2343 } 2344 2345 gatt_client->callback = callback; 2346 gatt_client->start_group_handle = start_handle; 2347 gatt_client->end_group_handle = end_handle; 2348 gatt_client->filter_with_uuid = 1; 2349 gatt_client->uuid16 = 0; 2350 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2351 gatt_client->characteristic_start_handle = 0; 2352 gatt_client->state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; 2353 gatt_client_run(); 2354 return ERROR_CODE_SUCCESS; 2355 } 2356 2357 2358 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){ 2359 return gatt_client_discover_characteristics_for_handle_range_by_uuid16(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid16); 2360 } 2361 2362 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){ 2363 return gatt_client_discover_characteristics_for_handle_range_by_uuid128(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid128); 2364 } 2365 2366 uint8_t gatt_client_discover_characteristic_descriptors(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 2367 gatt_client_t * gatt_client; 2368 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2369 if (status != ERROR_CODE_SUCCESS){ 2370 return status; 2371 } 2372 2373 if (characteristic->value_handle == characteristic->end_handle){ 2374 return ERROR_CODE_SUCCESS; 2375 } 2376 gatt_client->callback = callback; 2377 gatt_client->start_group_handle = characteristic->value_handle + 1u; 2378 gatt_client->end_group_handle = characteristic->end_handle; 2379 gatt_client->state = P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY; 2380 gatt_client_run(); 2381 return ERROR_CODE_SUCCESS; 2382 } 2383 2384 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){ 2385 gatt_client_t * gatt_client; 2386 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2387 if (status != ERROR_CODE_SUCCESS){ 2388 return status; 2389 } 2390 2391 gatt_client->callback = callback; 2392 gatt_client->attribute_handle = value_handle; 2393 gatt_client->attribute_offset = 0; 2394 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY; 2395 gatt_client_run(); 2396 return ERROR_CODE_SUCCESS; 2397 } 2398 2399 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){ 2400 gatt_client_t * gatt_client; 2401 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2402 if (status != ERROR_CODE_SUCCESS){ 2403 return status; 2404 } 2405 2406 gatt_client->callback = callback; 2407 gatt_client->start_group_handle = start_handle; 2408 gatt_client->end_group_handle = end_handle; 2409 gatt_client->query_start_handle = start_handle; 2410 gatt_client->query_end_handle = end_handle; 2411 gatt_client->uuid16 = uuid16; 2412 uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); 2413 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2414 gatt_client_run(); 2415 return ERROR_CODE_SUCCESS; 2416 } 2417 2418 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){ 2419 gatt_client_t * gatt_client; 2420 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2421 if (status != ERROR_CODE_SUCCESS){ 2422 return status; 2423 } 2424 2425 gatt_client->callback = callback; 2426 gatt_client->start_group_handle = start_handle; 2427 gatt_client->end_group_handle = end_handle; 2428 gatt_client->query_start_handle = start_handle; 2429 gatt_client->query_end_handle = end_handle; 2430 gatt_client->uuid16 = 0; 2431 (void)memcpy(gatt_client->uuid128, uuid128, 16); 2432 gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; 2433 gatt_client_run(); 2434 return ERROR_CODE_SUCCESS; 2435 } 2436 2437 2438 uint8_t gatt_client_read_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ 2439 return gatt_client_read_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); 2440 } 2441 2442 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){ 2443 gatt_client_t * gatt_client; 2444 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2445 if (status != ERROR_CODE_SUCCESS){ 2446 return status; 2447 } 2448 2449 gatt_client->callback = callback; 2450 gatt_client->attribute_handle = value_handle; 2451 gatt_client->attribute_offset = offset; 2452 gatt_client->state = P_W2_SEND_READ_BLOB_QUERY; 2453 gatt_client_run(); 2454 return ERROR_CODE_SUCCESS; 2455 } 2456 2457 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){ 2458 return gatt_client_read_long_value_of_characteristic_using_value_handle_with_offset(callback, con_handle, value_handle, 0); 2459 } 2460 2461 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){ 2462 return gatt_client_read_long_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); 2463 } 2464 2465 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){ 2466 gatt_client_t * gatt_client; 2467 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2468 if (status != ERROR_CODE_SUCCESS){ 2469 return status; 2470 } 2471 2472 #ifdef ENABLE_GATT_OVER_EATT 2473 if (state == P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST){ 2474 if (gatt_client->bearer_type != ATT_BEARER_ENHANCED_LE){ 2475 return ERROR_CODE_COMMAND_DISALLOWED; 2476 } 2477 } 2478 #endif 2479 2480 gatt_client->callback = callback; 2481 gatt_client->read_multiple_handle_count = num_value_handles; 2482 gatt_client->read_multiple_handles = value_handles; 2483 gatt_client->state = state; 2484 gatt_client_run(); 2485 return ERROR_CODE_SUCCESS; 2486 } 2487 2488 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){ 2489 return gatt_client_read_multiple_characteristic_values_with_state(callback, con_handle, num_value_handles, value_handles, P_W2_SEND_READ_MULTIPLE_REQUEST); 2490 } 2491 2492 #ifdef ENABLE_GATT_OVER_EATT 2493 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){ 2494 return gatt_client_read_multiple_characteristic_values_with_state(callback, con_handle, num_value_handles, value_handles, P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST); 2495 } 2496 #endif 2497 2498 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){ 2499 gatt_client_t * gatt_client; 2500 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2501 if (status != ERROR_CODE_SUCCESS){ 2502 return status; 2503 } 2504 2505 if (value_length > (gatt_client->mtu - 3u)) return GATT_CLIENT_VALUE_TOO_LONG; 2506 if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) return GATT_CLIENT_BUSY; 2507 2508 return att_write_request(gatt_client, ATT_WRITE_COMMAND, value_handle, value_length, value); 2509 } 2510 2511 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){ 2512 gatt_client_t * gatt_client; 2513 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2514 if (status != ERROR_CODE_SUCCESS){ 2515 return status; 2516 } 2517 2518 gatt_client->callback = callback; 2519 gatt_client->attribute_handle = value_handle; 2520 gatt_client->attribute_length = value_length; 2521 gatt_client->attribute_value = value; 2522 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; 2523 gatt_client_run(); 2524 return ERROR_CODE_SUCCESS; 2525 } 2526 2527 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){ 2528 gatt_client_t * gatt_client; 2529 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2530 if (status != ERROR_CODE_SUCCESS){ 2531 return status; 2532 } 2533 2534 gatt_client->callback = callback; 2535 gatt_client->attribute_handle = value_handle; 2536 gatt_client->attribute_length = value_length; 2537 gatt_client->attribute_offset = offset; 2538 gatt_client->attribute_value = value; 2539 gatt_client->state = P_W2_PREPARE_WRITE; 2540 gatt_client_run(); 2541 return ERROR_CODE_SUCCESS; 2542 } 2543 2544 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){ 2545 return gatt_client_write_long_value_of_characteristic_with_offset(callback, con_handle, value_handle, 0, value_length, value); 2546 } 2547 2548 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){ 2549 gatt_client_t * gatt_client; 2550 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2551 if (status != ERROR_CODE_SUCCESS){ 2552 return status; 2553 } 2554 2555 gatt_client->callback = callback; 2556 gatt_client->attribute_handle = value_handle; 2557 gatt_client->attribute_length = value_length; 2558 gatt_client->attribute_offset = 0; 2559 gatt_client->attribute_value = value; 2560 gatt_client->state = P_W2_PREPARE_RELIABLE_WRITE; 2561 gatt_client_run(); 2562 return ERROR_CODE_SUCCESS; 2563 } 2564 2565 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){ 2566 gatt_client_t * gatt_client; 2567 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2568 if (status != ERROR_CODE_SUCCESS){ 2569 return status; 2570 } 2571 2572 if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION) && 2573 ((characteristic->properties & ATT_PROPERTY_NOTIFY) == 0u)) { 2574 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED"); 2575 return GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED; 2576 } else if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION) && 2577 ((characteristic->properties & ATT_PROPERTY_INDICATE) == 0u)){ 2578 log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED"); 2579 return GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED; 2580 } 2581 2582 gatt_client->callback = callback; 2583 gatt_client->start_group_handle = characteristic->value_handle; 2584 gatt_client->end_group_handle = characteristic->end_handle; 2585 little_endian_store_16(gatt_client->client_characteristic_configuration_value, 0, configuration); 2586 2587 #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY 2588 gatt_client->gatt_client_state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2589 #else 2590 gatt_client->state = P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; 2591 #endif 2592 gatt_client_run(); 2593 return ERROR_CODE_SUCCESS; 2594 } 2595 2596 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){ 2597 gatt_client_t * gatt_client; 2598 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2599 if (status != ERROR_CODE_SUCCESS){ 2600 return status; 2601 } 2602 2603 gatt_client->callback = callback; 2604 gatt_client->attribute_handle = descriptor_handle; 2605 2606 gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; 2607 gatt_client_run(); 2608 return ERROR_CODE_SUCCESS; 2609 } 2610 2611 uint8_t gatt_client_read_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor){ 2612 return gatt_client_read_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2613 } 2614 2615 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){ 2616 gatt_client_t * gatt_client; 2617 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2618 if (status != ERROR_CODE_SUCCESS){ 2619 return status; 2620 } 2621 2622 gatt_client->callback = callback; 2623 gatt_client->attribute_handle = descriptor_handle; 2624 gatt_client->attribute_offset = offset; 2625 gatt_client->state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; 2626 gatt_client_run(); 2627 return ERROR_CODE_SUCCESS; 2628 } 2629 2630 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){ 2631 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0); 2632 } 2633 2634 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){ 2635 return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); 2636 } 2637 2638 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){ 2639 gatt_client_t * gatt_client; 2640 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2641 if (status != ERROR_CODE_SUCCESS){ 2642 return status; 2643 } 2644 2645 gatt_client->callback = callback; 2646 gatt_client->attribute_handle = descriptor_handle; 2647 gatt_client->attribute_length = value_length; 2648 gatt_client->attribute_offset = 0; 2649 gatt_client->attribute_value = value; 2650 gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; 2651 gatt_client_run(); 2652 return ERROR_CODE_SUCCESS; 2653 } 2654 2655 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){ 2656 return gatt_client_write_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); 2657 } 2658 2659 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){ 2660 gatt_client_t * gatt_client; 2661 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2662 if (status != ERROR_CODE_SUCCESS){ 2663 return status; 2664 } 2665 2666 gatt_client->callback = callback; 2667 gatt_client->attribute_handle = descriptor_handle; 2668 gatt_client->attribute_length = value_length; 2669 gatt_client->attribute_offset = offset; 2670 gatt_client->attribute_value = value; 2671 gatt_client->state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; 2672 gatt_client_run(); 2673 return ERROR_CODE_SUCCESS; 2674 } 2675 2676 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){ 2677 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0, value_length, value); 2678 } 2679 2680 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){ 2681 return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); 2682 } 2683 2684 /** 2685 * @brief -> gatt complete event 2686 */ 2687 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){ 2688 gatt_client_t * gatt_client; 2689 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2690 if (status != ERROR_CODE_SUCCESS){ 2691 return status; 2692 } 2693 2694 gatt_client->callback = callback; 2695 gatt_client->attribute_handle = attribute_handle; 2696 gatt_client->attribute_length = value_length; 2697 gatt_client->attribute_offset = offset; 2698 gatt_client->attribute_value = value; 2699 gatt_client->state = P_W2_PREPARE_WRITE_SINGLE; 2700 gatt_client_run(); 2701 return ERROR_CODE_SUCCESS; 2702 } 2703 2704 /** 2705 * @brief -> gatt complete event 2706 */ 2707 uint8_t gatt_client_execute_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2708 gatt_client_t * gatt_client; 2709 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2710 if (status != ERROR_CODE_SUCCESS){ 2711 return status; 2712 } 2713 2714 gatt_client->callback = callback; 2715 gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE; 2716 gatt_client_run(); 2717 return ERROR_CODE_SUCCESS; 2718 } 2719 2720 /** 2721 * @brief -> gatt complete event 2722 */ 2723 uint8_t gatt_client_cancel_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2724 gatt_client_t * gatt_client; 2725 uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); 2726 if (status != ERROR_CODE_SUCCESS){ 2727 return status; 2728 } 2729 2730 gatt_client->callback = callback; 2731 gatt_client->state = P_W2_CANCEL_PREPARED_WRITE; 2732 gatt_client_run(); 2733 return ERROR_CODE_SUCCESS; 2734 } 2735 2736 void gatt_client_deserialize_service(const uint8_t *packet, int offset, gatt_client_service_t * service){ 2737 service->start_group_handle = little_endian_read_16(packet, offset); 2738 service->end_group_handle = little_endian_read_16(packet, offset + 2); 2739 reverse_128(&packet[offset + 4], service->uuid128); 2740 if (uuid_has_bluetooth_prefix(service->uuid128)){ 2741 service->uuid16 = big_endian_read_32(service->uuid128, 0); 2742 } else { 2743 service->uuid16 = 0; 2744 } 2745 } 2746 2747 void gatt_client_deserialize_characteristic(const uint8_t * packet, int offset, gatt_client_characteristic_t * characteristic){ 2748 characteristic->start_handle = little_endian_read_16(packet, offset); 2749 characteristic->value_handle = little_endian_read_16(packet, offset + 2); 2750 characteristic->end_handle = little_endian_read_16(packet, offset + 4); 2751 characteristic->properties = little_endian_read_16(packet, offset + 6); 2752 reverse_128(&packet[offset+8], characteristic->uuid128); 2753 if (uuid_has_bluetooth_prefix(characteristic->uuid128)){ 2754 characteristic->uuid16 = big_endian_read_32(characteristic->uuid128, 0); 2755 } else { 2756 characteristic->uuid16 = 0; 2757 } 2758 } 2759 2760 void gatt_client_deserialize_characteristic_descriptor(const uint8_t * packet, int offset, gatt_client_characteristic_descriptor_t * descriptor){ 2761 descriptor->handle = little_endian_read_16(packet, offset); 2762 reverse_128(&packet[offset+2], descriptor->uuid128); 2763 if (uuid_has_bluetooth_prefix(descriptor->uuid128)){ 2764 descriptor->uuid16 = big_endian_read_32(descriptor->uuid128, 0); 2765 } else { 2766 descriptor->uuid16 = 0; 2767 } 2768 } 2769 2770 void gatt_client_send_mtu_negotiation(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2771 gatt_client_t * gatt_client; 2772 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2773 if (status != ERROR_CODE_SUCCESS){ 2774 return; 2775 } 2776 if (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED){ 2777 gatt_client->callback = callback; 2778 gatt_client->mtu_state = SEND_MTU_EXCHANGE; 2779 gatt_client_run(); 2780 } 2781 } 2782 2783 uint8_t gatt_client_request_to_write_without_response(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 2784 gatt_client_t * gatt_client; 2785 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2786 if (status != ERROR_CODE_SUCCESS){ 2787 return status; 2788 } 2789 bool added = btstack_linked_list_add_tail(&gatt_client->write_without_response_requests, (btstack_linked_item_t*) callback_registration); 2790 if (added == false){ 2791 return ERROR_CODE_COMMAND_DISALLOWED; 2792 } else { 2793 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 2794 return ERROR_CODE_SUCCESS; 2795 } 2796 } 2797 2798 uint8_t gatt_client_request_to_send_gatt_query(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 2799 gatt_client_t * gatt_client; 2800 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2801 if (status != ERROR_CODE_SUCCESS){ 2802 return status; 2803 } 2804 bool added = btstack_linked_list_add_tail(&gatt_client->query_requests, (btstack_linked_item_t*) callback_registration); 2805 if (added == false){ 2806 return ERROR_CODE_COMMAND_DISALLOWED; 2807 } else { 2808 gatt_client_notify_can_send_query(gatt_client); 2809 return ERROR_CODE_SUCCESS; 2810 } 2811 } 2812 2813 uint8_t gatt_client_request_can_write_without_response_event(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 2814 gatt_client_t * gatt_client; 2815 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 2816 if (status != ERROR_CODE_SUCCESS){ 2817 return status; 2818 } 2819 if (gatt_client->write_without_response_callback != NULL){ 2820 return GATT_CLIENT_IN_WRONG_STATE; 2821 } 2822 gatt_client->write_without_response_callback = callback; 2823 att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); 2824 return ERROR_CODE_SUCCESS; 2825 } 2826 2827 2828 #if defined(ENABLE_GATT_OVER_CLASSIC) || defined(ENABLE_GATT_OVER_EATT) 2829 2830 #include "hci_event.h" 2831 2832 static const hci_event_t gatt_client_connected = { 2833 GATT_EVENT_CONNECTED, 0, "1BH" 2834 }; 2835 2836 static const hci_event_t gatt_client_disconnected = { 2837 GATT_EVENT_DISCONNECTED, 0, "H" 2838 }; 2839 2840 static void gatt_client_emit_connected(btstack_packet_handler_t callback, uint8_t status, bd_addr_t addr, 2841 hci_con_handle_t con_handle) { 2842 uint8_t buffer[20]; 2843 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_connected, status, addr, con_handle); 2844 (*callback)(HCI_EVENT_PACKET, 0, buffer, len); 2845 } 2846 2847 #endif 2848 2849 #ifdef ENABLE_GATT_OVER_CLASSIC 2850 2851 #include "bluetooth_psm.h" 2852 2853 // single active SDP query 2854 static gatt_client_t * gatt_client_classic_active_sdp_query; 2855 2856 // macos protocol descriptor list requires 16 bytes 2857 static uint8_t gatt_client_classic_sdp_buffer[32]; 2858 2859 2860 static gatt_client_t * gatt_client_get_context_for_classic_addr(bd_addr_t addr){ 2861 btstack_linked_item_t *it; 2862 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 2863 gatt_client_t * gatt_client = (gatt_client_t *) it; 2864 if (memcmp(gatt_client->addr, addr, 6) == 0){ 2865 return gatt_client; 2866 } 2867 } 2868 return NULL; 2869 } 2870 2871 static gatt_client_t * gatt_client_get_context_for_l2cap_cid(uint16_t l2cap_cid){ 2872 btstack_linked_item_t *it; 2873 for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ 2874 gatt_client_t * gatt_client = (gatt_client_t *) it; 2875 if (gatt_client->l2cap_cid == l2cap_cid){ 2876 return gatt_client; 2877 } 2878 } 2879 return NULL; 2880 } 2881 2882 static void gatt_client_classic_handle_connected(gatt_client_t * gatt_client, uint8_t status){ 2883 bd_addr_t addr; 2884 // cppcheck-suppress uninitvar ; addr is reported as uninitialized although it's the destination of the memcpy 2885 memcpy(addr, gatt_client->addr, 6); 2886 hci_con_handle_t con_handle = gatt_client->con_handle; 2887 btstack_packet_handler_t callback = gatt_client->callback; 2888 if (status == ERROR_CODE_SUCCESS){ 2889 // store l2cap cid in hci_connection->att_server 2890 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 2891 hci_connection->att_server.l2cap_cid = gatt_client->l2cap_cid; 2892 } else { 2893 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 2894 btstack_memory_gatt_client_free(gatt_client); 2895 } 2896 gatt_client_emit_connected(callback, status, addr, con_handle); 2897 } 2898 2899 static void gatt_client_classic_handle_disconnected(gatt_client_t * gatt_client){ 2900 2901 gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 2902 gatt_client_timeout_stop(gatt_client); 2903 2904 hci_con_handle_t con_handle = gatt_client->con_handle; 2905 btstack_packet_handler_t callback = gatt_client->callback; 2906 btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); 2907 btstack_memory_gatt_client_free(gatt_client); 2908 2909 uint8_t buffer[20]; 2910 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_disconnected, con_handle); 2911 (*callback)(HCI_EVENT_PACKET, 0, buffer, len); 2912 } 2913 2914 static void gatt_client_handle_sdp_client_query_attribute_value(gatt_client_t * connection, uint8_t *packet){ 2915 des_iterator_t des_list_it; 2916 des_iterator_t prot_it; 2917 2918 if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= sizeof(gatt_client_classic_sdp_buffer)) { 2919 gatt_client_classic_sdp_buffer[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); 2920 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)) { 2921 switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) { 2922 case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST: 2923 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)) { 2924 uint8_t *des_element; 2925 uint8_t *element; 2926 uint32_t uuid; 2927 2928 if (des_iterator_get_type(&des_list_it) != DE_DES) continue; 2929 2930 des_element = des_iterator_get_element(&des_list_it); 2931 des_iterator_init(&prot_it, des_element); 2932 element = des_iterator_get_element(&prot_it); 2933 2934 if (de_get_element_type(element) != DE_UUID) continue; 2935 2936 uuid = de_get_uuid32(element); 2937 des_iterator_next(&prot_it); 2938 // we assume that the even if there are both roles supported, remote device uses the same psm and avdtp version for both 2939 switch (uuid){ 2940 case BLUETOOTH_PROTOCOL_L2CAP: 2941 if (!des_iterator_has_more(&prot_it)) continue; 2942 de_element_get_uint16(des_iterator_get_element(&prot_it), &connection->l2cap_psm); 2943 break; 2944 default: 2945 break; 2946 } 2947 } 2948 break; 2949 2950 default: 2951 break; 2952 } 2953 } 2954 } 2955 } 2956 2957 static void gatt_client_classic_sdp_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 2958 gatt_client_t * gatt_client = gatt_client_classic_active_sdp_query; 2959 btstack_assert(gatt_client != NULL); 2960 uint8_t status; 2961 2962 // TODO: handle sdp events, get l2cap psm 2963 switch (hci_event_packet_get_type(packet)){ 2964 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: 2965 gatt_client_handle_sdp_client_query_attribute_value(gatt_client, packet); 2966 // TODO: 2967 return; 2968 case SDP_EVENT_QUERY_COMPLETE: 2969 status = sdp_event_query_complete_get_status(packet); 2970 gatt_client_classic_active_sdp_query = NULL; 2971 log_info("l2cap psm: %0x, status %02x", gatt_client->l2cap_psm, status); 2972 if (status != ERROR_CODE_SUCCESS) break; 2973 if (gatt_client->l2cap_psm == 0) { 2974 status = SDP_SERVICE_NOT_FOUND; 2975 break; 2976 } 2977 break; 2978 default: 2979 btstack_assert(false); 2980 return; 2981 } 2982 2983 // done 2984 if (status == ERROR_CODE_SUCCESS){ 2985 gatt_client->state = P_W4_L2CAP_CONNECTION; 2986 status = att_dispatch_classic_connect(gatt_client->addr, gatt_client->l2cap_psm, &gatt_client->l2cap_cid); 2987 } 2988 if (status != ERROR_CODE_SUCCESS) { 2989 gatt_client_classic_handle_connected(gatt_client, status); 2990 } 2991 } 2992 2993 static void gatt_client_classic_sdp_start(void * context){ 2994 gatt_client_classic_active_sdp_query = (gatt_client_t *) context; 2995 gatt_client_classic_active_sdp_query->state = P_W4_SDP_QUERY; 2996 sdp_client_query_uuid16(gatt_client_classic_sdp_handler, gatt_client_classic_active_sdp_query->addr, ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 2997 } 2998 2999 static void gatt_client_classic_emit_connected(void * context){ 3000 gatt_client_t * gatt_client = (gatt_client_t *) context; 3001 gatt_client->state = P_READY; 3002 hci_connection_t * hci_connection = hci_connection_for_handle(gatt_client->con_handle); 3003 btstack_assert(hci_connection != NULL); 3004 gatt_client_emit_connected(gatt_client->callback, ERROR_CODE_SUCCESS, hci_connection->address, gatt_client->con_handle); 3005 } 3006 3007 uint8_t gatt_client_classic_connect(btstack_packet_handler_t callback, bd_addr_t addr){ 3008 gatt_client_t * gatt_client = gatt_client_get_context_for_classic_addr(addr); 3009 if (gatt_client != NULL){ 3010 return ERROR_CODE_ACL_CONNECTION_ALREADY_EXISTS; 3011 } 3012 gatt_client = btstack_memory_gatt_client_get(); 3013 if (gatt_client == NULL){ 3014 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 3015 } 3016 // init state 3017 gatt_client->bearer_type = ATT_BEARER_UNENHANCED_CLASSIC; 3018 gatt_client->con_handle = HCI_CON_HANDLE_INVALID; 3019 memcpy(gatt_client->addr, addr, 6); 3020 gatt_client->mtu = ATT_DEFAULT_MTU; 3021 gatt_client->security_level = LEVEL_0; 3022 gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 3023 gatt_client->callback = callback; 3024 #ifdef ENABLE_GATT_OVER_EATT 3025 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3026 #endif 3027 btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); 3028 3029 // schedule emitted event if already connected, otherwise 3030 bool already_connected = false; 3031 hci_connection_t * hci_connection = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL); 3032 if (hci_connection != NULL){ 3033 if (hci_connection->att_server.l2cap_cid != 0){ 3034 already_connected = true; 3035 } 3036 } 3037 gatt_client->callback_request.context = gatt_client; 3038 if (already_connected){ 3039 gatt_client->con_handle = hci_connection->con_handle; 3040 gatt_client->callback_request.callback = &gatt_client_classic_emit_connected; 3041 gatt_client->state = P_W2_EMIT_CONNECTED; 3042 btstack_run_loop_execute_on_main_thread(&gatt_client->callback_request); 3043 } else { 3044 gatt_client->callback_request.callback = &gatt_client_classic_sdp_start; 3045 gatt_client->state = P_W2_SDP_QUERY; 3046 sdp_client_register_query_callback(&gatt_client->callback_request); 3047 } 3048 return ERROR_CODE_SUCCESS; 3049 } 3050 3051 uint8_t gatt_client_classic_disconnect(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ 3052 gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); 3053 if (gatt_client == NULL){ 3054 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 3055 } 3056 gatt_client->callback = callback; 3057 return l2cap_disconnect(gatt_client->l2cap_cid); 3058 } 3059 #endif 3060 3061 #ifdef ENABLE_GATT_OVER_EATT 3062 3063 #define MAX_NR_EATT_CHANNELS 5 3064 3065 static void gatt_client_le_enhanced_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 3066 3067 static void gatt_client_eatt_finalize(gatt_client_t * gatt_client) { 3068 // free eatt clients 3069 btstack_linked_list_iterator_t it; 3070 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3071 while (btstack_linked_list_iterator_has_next(&it)) { 3072 gatt_client_t *eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3073 btstack_linked_list_iterator_remove(&it); 3074 btstack_memory_gatt_client_free(eatt_client); 3075 } 3076 } 3077 3078 // all channels connected 3079 static void gatt_client_le_enhanced_handle_connected(gatt_client_t * gatt_client, uint8_t status) { 3080 if (status == ERROR_CODE_SUCCESS){ 3081 gatt_client->eatt_state = GATT_CLIENT_EATT_READY; 3082 } else { 3083 gatt_client_eatt_finalize(gatt_client); 3084 gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; 3085 } 3086 3087 gatt_client_emit_connected(gatt_client->callback, status, gatt_client->addr, gatt_client->con_handle); 3088 } 3089 3090 // single channel disconnected 3091 static void gatt_client_le_enhanced_handle_ecbm_disconnected(gatt_client_t * gatt_client, gatt_client_t * eatt_client) { 3092 if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY) { 3093 3094 // report error 3095 gatt_client_report_error_if_pending(eatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); 3096 3097 // free memory 3098 btstack_linked_list_remove(&gatt_client->eatt_clients, (btstack_linked_item_t *) eatt_client); 3099 btstack_memory_gatt_client_free(eatt_client); 3100 3101 // report disconnected if last channel closed 3102 if (btstack_linked_list_empty(&gatt_client->eatt_clients)){ 3103 // emit disconnected when last eatt client is gone 3104 uint8_t buffer[20]; 3105 uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_disconnected, gatt_client->con_handle); 3106 (*gatt_client->callback)(HCI_EVENT_PACKET, 0, buffer, len); 3107 } 3108 } 3109 } 3110 3111 static gatt_client_t * gatt_client_le_enhanced_get_context_for_l2cap_cid(uint16_t l2cap_cid, gatt_client_t ** out_eatt_client){ 3112 btstack_linked_list_iterator_t it; 3113 btstack_linked_list_iterator_init(&it, &gatt_client_connections); 3114 while (btstack_linked_list_iterator_has_next(&it)) { 3115 gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3116 btstack_linked_list_iterator_t it2; 3117 btstack_linked_list_iterator_init(&it2, &gatt_client->eatt_clients); 3118 while (btstack_linked_list_iterator_has_next(&it2)) { 3119 gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it2); 3120 if (eatt_client->l2cap_cid == l2cap_cid){ 3121 *out_eatt_client = eatt_client; 3122 return gatt_client; 3123 } 3124 } 3125 } 3126 return NULL; 3127 } 3128 3129 static void gatt_client_le_enhanced_setup_l2cap_channel(gatt_client_t * gatt_client){ 3130 uint8_t num_channels = gatt_client->eatt_num_clients; 3131 3132 // setup channels 3133 uint16_t buffer_size_per_client = gatt_client->eatt_storage_size / num_channels; 3134 uint16_t max_mtu = (buffer_size_per_client - REPORT_PREBUFFER_HEADER) / 2; 3135 uint8_t * receive_buffers[MAX_NR_EATT_CHANNELS]; 3136 uint16_t new_cids[MAX_NR_EATT_CHANNELS]; 3137 memset(gatt_client->eatt_storage_buffer, 0, gatt_client->eatt_storage_size); 3138 uint8_t i; 3139 for (i=0;i<gatt_client->eatt_num_clients; i++){ 3140 receive_buffers[i] = &gatt_client->eatt_storage_buffer[REPORT_PREBUFFER_HEADER]; 3141 gatt_client->eatt_storage_buffer += REPORT_PREBUFFER_HEADER + max_mtu; 3142 } 3143 3144 log_info("%u EATT clients with receive buffer size %u", gatt_client->eatt_num_clients, buffer_size_per_client); 3145 3146 uint8_t status = l2cap_ecbm_create_channels(&gatt_client_le_enhanced_packet_handler, 3147 gatt_client->con_handle, 3148 gatt_client->security_level, 3149 BLUETOOTH_PSM_EATT, num_channels, 3150 L2CAP_LE_AUTOMATIC_CREDITS, 3151 buffer_size_per_client, 3152 receive_buffers, 3153 new_cids); 3154 3155 if (status == ERROR_CODE_SUCCESS){ 3156 i = 0; 3157 btstack_linked_list_iterator_t it; 3158 btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); 3159 while (btstack_linked_list_iterator_has_next(&it)) { 3160 gatt_client_t *new_eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); 3161 3162 // init state with new cid and transmit buffer 3163 new_eatt_client->bearer_type = ATT_BEARER_ENHANCED_LE; 3164 new_eatt_client->con_handle = gatt_client->con_handle; 3165 new_eatt_client->mtu = 64; 3166 new_eatt_client->security_level = LEVEL_0; 3167 new_eatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; 3168 new_eatt_client->state = P_W4_L2CAP_CONNECTION; 3169 new_eatt_client->l2cap_cid = new_cids[i]; 3170 new_eatt_client->eatt_storage_buffer = gatt_client->eatt_storage_buffer; 3171 gatt_client->eatt_storage_buffer += max_mtu; 3172 i++; 3173 } 3174 gatt_client->eatt_state = GATT_CLIENT_EATT_L2CAP_SETUP; 3175 } else { 3176 gatt_client_le_enhanced_handle_connected(gatt_client, status); 3177 } 3178 } 3179 3180 static void gatt_client_le_enhanced_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) { 3181 gatt_client_t *gatt_client; 3182 gatt_client_t *eatt_client; 3183 hci_con_handle_t con_handle; 3184 uint16_t l2cap_cid; 3185 uint8_t status; 3186 gatt_client_characteristic_t characteristic; 3187 gatt_client_service_t service; 3188 switch (packet_type) { 3189 case HCI_EVENT_PACKET: 3190 switch (hci_event_packet_get_type(packet)) { 3191 case GATT_EVENT_SERVICE_QUERY_RESULT: 3192 con_handle = gatt_event_service_query_result_get_handle(packet); 3193 gatt_client = gatt_client_get_context_for_handle(con_handle); 3194 btstack_assert(gatt_client != NULL); 3195 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE); 3196 gatt_event_service_query_result_get_service(packet, &service); 3197 gatt_client->gatt_service_start_group_handle = service.start_group_handle; 3198 gatt_client->gatt_service_end_group_handle = service.end_group_handle; 3199 break; 3200 case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: 3201 con_handle = gatt_event_characteristic_value_query_result_get_handle(packet); 3202 gatt_client = gatt_client_get_context_for_handle(con_handle); 3203 btstack_assert(gatt_client != NULL); 3204 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE); 3205 if (gatt_event_characteristic_value_query_result_get_value_length(packet) >= 1) { 3206 gatt_client->gatt_server_supported_features = gatt_event_characteristic_value_query_result_get_value(packet)[0]; 3207 } 3208 break; 3209 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 3210 con_handle = gatt_event_characteristic_query_result_get_handle(packet); 3211 gatt_client = gatt_client_get_context_for_handle(con_handle); 3212 btstack_assert(gatt_client != NULL); 3213 btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE); 3214 gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic); 3215 gatt_client->gatt_client_supported_features_handle = characteristic.value_handle; 3216 break; 3217 case GATT_EVENT_QUERY_COMPLETE: 3218 con_handle = gatt_event_query_complete_get_handle(packet); 3219 gatt_client = gatt_client_get_context_for_handle(con_handle); 3220 btstack_assert(gatt_client != NULL); 3221 switch (gatt_client->eatt_state){ 3222 case GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE: 3223 if (gatt_client->gatt_service_start_group_handle == 0){ 3224 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3225 } else { 3226 gatt_client->eatt_state = GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W2_SEND; 3227 } 3228 break; 3229 case GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE: 3230 if ((gatt_client->gatt_server_supported_features & 1) == 0) { 3231 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3232 } else { 3233 gatt_client->eatt_state = GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W2_SEND; 3234 } 3235 break; 3236 case GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE: 3237 if (gatt_client->gatt_client_supported_features_handle == 0){ 3238 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 3239 } else { 3240 gatt_client->eatt_state = GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W2_SEND; 3241 } 3242 break; 3243 case GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W4_DONE: 3244 gatt_client_le_enhanced_setup_l2cap_channel(gatt_client); 3245 break; 3246 default: 3247 break; 3248 } 3249 break; 3250 case L2CAP_EVENT_ECBM_CHANNEL_OPENED: 3251 l2cap_cid = l2cap_event_ecbm_channel_opened_get_local_cid(packet); 3252 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(l2cap_cid, &eatt_client); 3253 3254 btstack_assert(gatt_client != NULL); 3255 btstack_assert(eatt_client != NULL); 3256 btstack_assert(eatt_client->state == P_W4_L2CAP_CONNECTION); 3257 3258 status = l2cap_event_channel_opened_get_status(packet); 3259 if (status == ERROR_CODE_SUCCESS){ 3260 eatt_client->state = P_READY; 3261 eatt_client->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); 3262 } else { 3263 gatt_client_le_enhanced_handle_ecbm_disconnected(gatt_client, eatt_client); 3264 } 3265 // all channels opened? 3266 gatt_client->eatt_num_clients--; 3267 if (gatt_client->eatt_num_clients == 0){ 3268 gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_SUCCESS); 3269 } 3270 break; 3271 case L2CAP_EVENT_CHANNEL_CLOSED: 3272 l2cap_cid = l2cap_event_channel_closed_get_local_cid(packet); 3273 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(l2cap_cid, &eatt_client); 3274 btstack_assert(gatt_client != NULL); 3275 btstack_assert(eatt_client != NULL); 3276 gatt_client_le_enhanced_handle_ecbm_disconnected(gatt_client, eatt_client); 3277 break; 3278 default: 3279 break; 3280 } 3281 break; 3282 case L2CAP_DATA_PACKET: 3283 gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(channel, &eatt_client); 3284 btstack_assert(gatt_client != NULL); 3285 btstack_assert(eatt_client != NULL); 3286 gatt_client_handle_att_response(eatt_client, packet, size); 3287 gatt_client_run(); 3288 break; 3289 default: 3290 break; 3291 } 3292 } 3293 3294 static bool gatt_client_le_enhanced_handle_can_send_query(gatt_client_t * gatt_client){ 3295 uint8_t status = ERROR_CODE_SUCCESS; 3296 uint8_t gatt_client_supported_features = 0x06; // eatt + multiple value notifications 3297 switch (gatt_client->eatt_state){ 3298 case GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W2_SEND: 3299 gatt_client->gatt_service_start_group_handle = 0; 3300 gatt_client->eatt_state = GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE; 3301 status = gatt_client_discover_primary_services_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3302 gatt_client->con_handle, 3303 ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); 3304 break; 3305 case GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W2_SEND: 3306 gatt_client->gatt_server_supported_features = 0; 3307 gatt_client->eatt_state = GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE; 3308 status = gatt_client_read_value_of_characteristics_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3309 gatt_client->con_handle, 3310 gatt_client->gatt_service_start_group_handle, 3311 gatt_client->gatt_service_end_group_handle, 3312 ORG_BLUETOOTH_CHARACTERISTIC_SERVER_SUPPORTED_FEATURES); 3313 return true; 3314 case GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W2_SEND: 3315 gatt_client->gatt_client_supported_features_handle = 0; 3316 gatt_client->eatt_state = GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE; 3317 status = gatt_client_discover_characteristics_for_handle_range_by_uuid16(&gatt_client_le_enhanced_packet_handler, 3318 gatt_client->con_handle, 3319 gatt_client->gatt_service_start_group_handle, 3320 gatt_client->gatt_service_end_group_handle, 3321 ORG_BLUETOOTH_CHARACTERISTIC_CLIENT_SUPPORTED_FEATURES); 3322 return true; 3323 case GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W2_SEND: 3324 gatt_client->eatt_state = GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W4_DONE; 3325 status = gatt_client_write_value_of_characteristic(&gatt_client_le_enhanced_packet_handler, gatt_client->con_handle, 3326 gatt_client->gatt_client_supported_features_handle, 1, 3327 &gatt_client_supported_features); 3328 return true; 3329 default: 3330 break; 3331 } 3332 btstack_assert(status == ERROR_CODE_SUCCESS); 3333 UNUSED(status); 3334 return false; 3335 } 3336 3337 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) { 3338 gatt_client_t * gatt_client; 3339 uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); 3340 if (status != ERROR_CODE_SUCCESS){ 3341 return status; 3342 } 3343 3344 if (gatt_client->eatt_state != GATT_CLIENT_EATT_IDLE){ 3345 return ERROR_CODE_COMMAND_DISALLOWED; 3346 } 3347 3348 // need one buffer for sending and one for receiving. Receiving includes pre-buffer for reports 3349 uint16_t buffer_size_per_client = storage_size / num_channels; 3350 uint16_t max_mtu = (buffer_size_per_client - REPORT_PREBUFFER_HEADER) / 2; 3351 if (max_mtu < 64) { 3352 return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS; 3353 } 3354 3355 if ((num_channels == 0) || (num_channels > MAX_NR_EATT_CHANNELS)){ 3356 return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS; 3357 } 3358 3359 // create max num_channel eatt clients 3360 uint8_t i; 3361 btstack_linked_list_t eatt_clients = NULL; 3362 for (i=0;i<num_channels;i++) { 3363 gatt_client_t * new_gatt_client = btstack_memory_gatt_client_get(); 3364 if (new_gatt_client == NULL) { 3365 break; 3366 } 3367 btstack_linked_list_add(&eatt_clients, (btstack_linked_item_t*)new_gatt_client); 3368 } 3369 3370 if (i != num_channels){ 3371 while (true){ 3372 gatt_client = (gatt_client_t *) btstack_linked_list_pop(&eatt_clients); 3373 if (gatt_client == NULL) { 3374 break; 3375 } 3376 btstack_memory_gatt_client_free(gatt_client); 3377 } 3378 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 3379 } 3380 3381 gatt_client->callback = callback; 3382 gatt_client->eatt_num_clients = num_channels; 3383 gatt_client->eatt_storage_buffer = storage_buffer; 3384 gatt_client->eatt_storage_size = storage_size; 3385 gatt_client->eatt_clients = eatt_clients; 3386 gatt_client->eatt_state = GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W2_SEND; 3387 gatt_client_notify_can_send_query(gatt_client); 3388 3389 return ERROR_CODE_SUCCESS; 3390 } 3391 3392 #endif 3393 3394 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 3395 void gatt_client_att_packet_handler_fuzz(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 3396 gatt_client_att_packet_handler(packet_type, handle, packet, size); 3397 } 3398 3399 uint8_t gatt_client_get_client(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ 3400 uint8_t status = gatt_client_provide_context_for_handle(con_handle, out_gatt_client); 3401 return status; 3402 } 3403 #endif 3404