1 /* 2 * Copyright (C) 2021 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "battery_service_client.c" 39 40 #include "btstack_config.h" 41 42 #ifdef ENABLE_TESTING_SUPPORT 43 #include <stdio.h> 44 #include <unistd.h> 45 #endif 46 47 #include <stdint.h> 48 #include <string.h> 49 50 51 #include "ble/gatt-service/battery_service_client.h" 52 53 #include "btstack_memory.h" 54 #include "ble/core.h" 55 #include "ble/gatt_client.h" 56 #include "bluetooth_gatt.h" 57 #include "btstack_debug.h" 58 #include "btstack_event.h" 59 #include "btstack_run_loop.h" 60 #include "gap.h" 61 62 #define BATTERY_SERVICE_INVALID_INDEX 0xFF 63 64 static btstack_linked_list_t clients; 65 static uint16_t battery_service_cid_counter = 0; 66 67 static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 68 static void battery_service_poll_timer_start(battery_service_client_t * client); 69 70 static uint16_t battery_service_get_next_cid(void){ 71 battery_service_cid_counter = btstack_next_cid_ignoring_zero(battery_service_cid_counter); 72 return battery_service_cid_counter; 73 } 74 75 static battery_service_client_t * battery_service_create_client(hci_con_handle_t con_handle, uint16_t cid){ 76 battery_service_client_t * client = btstack_memory_battery_service_client_get(); 77 if (!client){ 78 log_error("Not enough memory to create client"); 79 return NULL; 80 } 81 client->cid = cid; 82 client->con_handle = con_handle; 83 client->poll_interval_ms = 0; 84 client->num_instances = 0; 85 client->service_index = 0; 86 client->poll_bitmap = 0; 87 client->need_poll_bitmap = 0; 88 client->polled_service_index = BATTERY_SERVICE_INVALID_INDEX; 89 client->state = BATTERY_SERVICE_CLIENT_STATE_IDLE; 90 91 btstack_linked_list_add(&clients, (btstack_linked_item_t *) client); 92 return client; 93 } 94 95 static void battery_service_finalize_client(battery_service_client_t * client){ 96 // stop listening 97 uint8_t i; 98 for (i = 0; i < client->num_instances; i++){ 99 gatt_client_stop_listening_for_characteristic_value_updates(&client->services[i].notification_listener); 100 } 101 102 // remove timer 103 btstack_run_loop_remove_timer(&client->poll_timer); 104 105 btstack_linked_list_remove(&clients, (btstack_linked_item_t *) client); 106 btstack_memory_battery_service_client_free(client); 107 } 108 109 static battery_service_client_t * battery_service_get_client_for_con_handle(hci_con_handle_t con_handle){ 110 btstack_linked_list_iterator_t it; 111 btstack_linked_list_iterator_init(&it, &clients); 112 while (btstack_linked_list_iterator_has_next(&it)){ 113 battery_service_client_t * client = (battery_service_client_t *)btstack_linked_list_iterator_next(&it); 114 if (client->con_handle != con_handle) continue; 115 return client; 116 } 117 return NULL; 118 } 119 120 static battery_service_client_t * battery_service_get_client_for_cid(uint16_t battery_service_cid){ 121 btstack_linked_list_iterator_t it; 122 btstack_linked_list_iterator_init(&it, &clients); 123 while (btstack_linked_list_iterator_has_next(&it)){ 124 battery_service_client_t * client = (battery_service_client_t *)btstack_linked_list_iterator_next(&it); 125 if (client->cid != battery_service_cid) continue; 126 return client; 127 } 128 return NULL; 129 } 130 131 static void battery_service_emit_connection_established(battery_service_client_t * client, uint8_t status){ 132 uint8_t event[8]; 133 int pos = 0; 134 event[pos++] = HCI_EVENT_GATTSERVICE_META; 135 event[pos++] = sizeof(event) - 2; 136 event[pos++] = GATTSERVICE_SUBEVENT_BATTERY_SERVICE_CONNECTED; 137 little_endian_store_16(event, pos, client->cid); 138 pos += 2; 139 event[pos++] = status; 140 event[pos++] = client->num_instances; 141 event[pos++] = client->poll_bitmap; 142 143 (*client->client_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 144 } 145 146 static void battery_service_emit_battery_level(battery_service_client_t * client, uint16_t value_handle, uint8_t att_status, uint8_t battery_level){ 147 uint8_t event[8]; 148 int pos = 0; 149 event[pos++] = HCI_EVENT_GATTSERVICE_META; 150 event[pos++] = sizeof(event) - 2; 151 event[pos++] = GATTSERVICE_SUBEVENT_BATTERY_SERVICE_LEVEL; 152 little_endian_store_16(event, pos, client->cid); 153 pos += 2; 154 155 uint8_t i; 156 for (i = 0; i < client->num_instances; i++){ 157 if (value_handle == client->services[i].value_handle){ 158 event[pos++] = i; 159 event[pos++] = att_status; 160 event[pos++] = battery_level; 161 (*client->client_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 162 break; 163 } 164 } 165 } 166 167 static bool battery_service_registered_notification(battery_service_client_t * client, uint16_t service_index){ 168 gatt_client_characteristic_t characteristic; 169 // if there are services without notification, register pool timer, 170 // othervise register for notifications 171 characteristic.value_handle = client->services[service_index].value_handle; 172 characteristic.properties = client->services[service_index].properties; 173 characteristic.end_handle = client->services[service_index].end_handle; 174 175 uint8_t status = gatt_client_write_client_characteristic_configuration( 176 &handle_gatt_client_event, 177 client->con_handle, 178 &characteristic, 179 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION); 180 181 // notification supported, register for value updates 182 if (status == ERROR_CODE_SUCCESS){ 183 gatt_client_listen_for_characteristic_value_updates( 184 &client->services[service_index].notification_listener, 185 &handle_gatt_client_event, 186 client->con_handle, &characteristic); 187 } else { 188 client->poll_bitmap |= 1u << client->service_index; 189 } 190 return status; 191 } 192 193 static void battery_service_start_polling_if_needed(battery_service_client_t * client){ 194 if (client->poll_interval_ms > 0){ 195 client->need_poll_bitmap = client->poll_bitmap; 196 battery_service_poll_timer_start(client); 197 } 198 } 199 200 static void battery_service_run_for_client(battery_service_client_t * client){ 201 uint8_t status; 202 uint8_t i; 203 gatt_client_characteristic_t characteristic; 204 205 switch (client->state){ 206 case BATTERY_SERVICE_CLIENT_STATE_CONNECTED: 207 for (i = 0; i < client->num_instances; i++){ 208 if ( ((client->need_poll_bitmap >> i) & 0x01) == 0x01 ){ 209 // clear bit of polled service 210 client->need_poll_bitmap &= ~(1u << i); 211 client->polled_service_index = i; 212 213 // poll value of characteristic 214 characteristic.value_handle = client->services[i].value_handle; 215 characteristic.properties = client->services[i].properties; 216 characteristic.end_handle = client->services[i].end_handle; 217 gatt_client_read_value_of_characteristic(&handle_gatt_client_event, client->con_handle, &characteristic); 218 break; 219 } 220 } 221 break; 222 223 case BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_SERVICE: 224 client->state = BATTERY_SERVICE_CLIENT_STATE_W4_SERVICE_RESULT; 225 status = gatt_client_discover_primary_services_by_uuid16(&handle_gatt_client_event, client->con_handle, ORG_BLUETOOTH_SERVICE_BATTERY_SERVICE); 226 // TODO handle status 227 break; 228 229 case BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_CHARACTERISTICS: 230 client->state = BATTERY_SERVICE_CLIENT_STATE_W4_CHARACTERISTIC_RESULT; 231 232 gatt_client_discover_characteristics_for_handle_range_by_uuid16( 233 &handle_gatt_client_event, 234 client->con_handle, 235 client->services[client->service_index].start_handle, 236 client->services[client->service_index].end_handle, 237 ORG_BLUETOOTH_CHARACTERISTIC_BATTERY_LEVEL); 238 239 break; 240 241 #ifdef ENABLE_TESTING_SUPPORT 242 case BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_CHARACTERISTIC_DESCRIPTORS: 243 client->state = BATTERY_SERVICE_CLIENT_STATE_W4_CHARACTERISTIC_DESCRIPTORS_RESULT; 244 // if there are services without notification, register pool timer, 245 // othervise register for notifications 246 characteristic.value_handle = client->services[client->service_index].value_handle; 247 characteristic.properties = client->services[client->service_index].properties; 248 characteristic.end_handle = client->services[client->service_index].end_handle; 249 250 (void) gatt_client_discover_characteristic_descriptors(&handle_gatt_client_event, client->con_handle, &characteristic); 251 break; 252 253 case BATTERY_SERVICE_CLIENT_W2_READ_CHARACTERISTIC_CONFIGURATION: 254 printf("Read client characteristic value [Service %d, handle 0x%04X]:\n", 255 client->service_index, 256 client->services[client->service_index].ccc_handle); 257 258 client->state = BATTERY_SERVICE_CLIENT_W4_CHARACTERISTIC_CONFIGURATION_RESULT; 259 260 // result in GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT 261 (void) gatt_client_read_characteristic_descriptor_using_descriptor_handle( 262 &handle_gatt_client_event, 263 client->con_handle, 264 client->services[client->service_index].ccc_handle); 265 break; 266 #endif 267 268 case BATTERY_SERVICE_CLIENT_STATE_W2_REGISTER_NOTIFICATION: 269 client->state = BATTERY_SERVICE_CLIENT_STATE_W4_NOTIFICATION_REGISTERED; 270 271 for (; client->service_index < client->num_instances; client->service_index++){ 272 status = battery_service_registered_notification(client, client->service_index); 273 if (status == ERROR_CODE_SUCCESS) return; 274 } 275 276 277 #ifdef ENABLE_TESTING_SUPPORT 278 for (client->service_index = 0; client->service_index < client->num_instances; client->service_index++){ 279 bool need_polling = (client->poll_bitmap & (1 << client->service_index)) != 0; 280 if ( (client->services[client->service_index].ccc_handle != 0) && !need_polling ){ 281 client->state = BATTERY_SERVICE_CLIENT_W2_READ_CHARACTERISTIC_CONFIGURATION; 282 break; 283 } 284 } 285 #endif 286 client->state = BATTERY_SERVICE_CLIENT_STATE_CONNECTED; 287 battery_service_emit_connection_established(client, ERROR_CODE_SUCCESS); 288 battery_service_start_polling_if_needed(client); 289 break; 290 default: 291 break; 292 } 293 } 294 295 static void battery_service_poll_timer_timeout_handler(btstack_timer_source_t * timer){ 296 uint16_t battery_service_cid = (uint16_t)(uintptr_t) btstack_run_loop_get_timer_context(timer); 297 298 battery_service_client_t * client = battery_service_get_client_for_cid(battery_service_cid); 299 btstack_assert(client != NULL); 300 301 client->need_poll_bitmap = client->poll_bitmap; 302 battery_service_poll_timer_start(client); 303 battery_service_run_for_client(client); 304 } 305 306 static void battery_service_poll_timer_start(battery_service_client_t * client){ 307 btstack_run_loop_set_timer_handler(&client->poll_timer, battery_service_poll_timer_timeout_handler); 308 btstack_run_loop_set_timer_context(&client->poll_timer, (void *)(uintptr_t)client->cid); 309 310 btstack_run_loop_set_timer(&client->poll_timer, client->poll_interval_ms); 311 btstack_run_loop_add_timer(&client->poll_timer); 312 } 313 314 static void battery_service_client_validate_service(battery_service_client_t * client){ 315 // remove all services without characteristic (array in-place) 316 uint8_t src_index = 0; // next entry to check 317 uint8_t dest_index = 0; // to store entry 318 for (src_index = 0; src_index < client->num_instances; src_index++){ 319 if (client->services[src_index].value_handle != 0){ 320 if (src_index != dest_index) { 321 client->services[dest_index] = client->services[src_index]; 322 } 323 dest_index++; 324 } 325 } 326 client->num_instances = dest_index; 327 } 328 329 static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 330 UNUSED(packet_type); 331 UNUSED(channel); 332 UNUSED(size); 333 334 battery_service_client_t * client = NULL; 335 gatt_client_service_t service; 336 gatt_client_characteristic_t characteristic; 337 uint8_t status; 338 339 switch(hci_event_packet_get_type(packet)){ 340 case GATT_EVENT_SERVICE_QUERY_RESULT: 341 client = battery_service_get_client_for_con_handle(gatt_event_service_query_result_get_handle(packet)); 342 btstack_assert(client != NULL); 343 344 if (client->num_instances < MAX_NUM_BATTERY_SERVICES){ 345 gatt_event_service_query_result_get_service(packet, &service); 346 client->services[client->num_instances].start_handle = service.start_group_handle; 347 client->services[client->num_instances].end_handle = service.end_group_handle; 348 349 #ifdef ENABLE_TESTING_SUPPORT 350 printf("Battery Service: start handle 0x%04X, end handle 0x%04X\n", client->services[client->num_instances].start_handle, client->services[client->num_instances].end_handle); 351 #endif 352 client->num_instances++; 353 } else { 354 log_info("Found more then %d, Battery Service instances. Increase MAX_NUM_BATTERY_SERVICES to store all.", MAX_NUM_BATTERY_SERVICES); 355 } 356 break; 357 358 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 359 client = battery_service_get_client_for_con_handle(gatt_event_characteristic_query_result_get_handle(packet)); 360 btstack_assert(client != NULL); 361 362 gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic); 363 btstack_assert(client->service_index < client->num_instances); 364 btstack_assert(characteristic.uuid16 == ORG_BLUETOOTH_CHARACTERISTIC_BATTERY_LEVEL); 365 366 client->services[client->service_index].value_handle = characteristic.value_handle; 367 client->services[client->service_index].properties = characteristic.properties; 368 369 #ifdef ENABLE_TESTING_SUPPORT 370 printf("Battery Level Characteristic:\n Attribute Handle 0x%04X, Properties 0x%02X, Handle 0x%04X, UUID 0x%04X, service %d\n", 371 // hid_characteristic_name(characteristic.uuid16), 372 characteristic.start_handle, 373 characteristic.properties, 374 characteristic.value_handle, characteristic.uuid16, 375 client->service_index); 376 #endif 377 break; 378 379 case GATT_EVENT_NOTIFICATION: 380 if (gatt_event_notification_get_value_length(packet) != 1) break; 381 382 client = battery_service_get_client_for_con_handle(gatt_event_notification_get_handle(packet)); 383 btstack_assert(client != NULL); 384 385 battery_service_emit_battery_level(client, 386 gatt_event_notification_get_value_handle(packet), 387 ATT_ERROR_SUCCESS, 388 gatt_event_notification_get_value(packet)[0]); 389 break; 390 391 case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: 392 client = battery_service_get_client_for_con_handle(gatt_event_characteristic_value_query_result_get_handle(packet)); 393 btstack_assert(client != NULL); 394 395 #ifdef ENABLE_TESTING_SUPPORT 396 if (client->state == BATTERY_SERVICE_CLIENT_W4_CHARACTERISTIC_CONFIGURATION_RESULT){ 397 printf(" Received CCC value: "); 398 printf_hexdump(gatt_event_characteristic_value_query_result_get_value(packet), gatt_event_characteristic_value_query_result_get_value_length(packet)); 399 break; 400 } 401 #endif 402 if (gatt_event_characteristic_value_query_result_get_value_length(packet) != 1) break; 403 404 battery_service_emit_battery_level(client, 405 gatt_event_characteristic_value_query_result_get_value_handle(packet), 406 ATT_ERROR_SUCCESS, 407 gatt_event_characteristic_value_query_result_get_value(packet)[0]); 408 break; 409 410 #ifdef ENABLE_TESTING_SUPPORT 411 case GATT_EVENT_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT:{ 412 gatt_client_characteristic_descriptor_t characteristic_descriptor; 413 414 client = battery_service_get_client_for_con_handle(gatt_event_all_characteristic_descriptors_query_result_get_handle(packet)); 415 btstack_assert(client != NULL); 416 gatt_event_all_characteristic_descriptors_query_result_get_characteristic_descriptor(packet, &characteristic_descriptor); 417 418 if (characteristic_descriptor.uuid16 == ORG_BLUETOOTH_DESCRIPTOR_GATT_CLIENT_CHARACTERISTIC_CONFIGURATION){ 419 client->services[client->service_index].ccc_handle = characteristic_descriptor.handle; 420 421 printf(" Battery Level Client Characteristic Configuration Descriptor[%d]: Handle 0x%04X, UUID 0x%04X\n", 422 client->service_index, 423 characteristic_descriptor.handle, 424 characteristic_descriptor.uuid16); 425 } 426 break; 427 } 428 #endif 429 430 case GATT_EVENT_QUERY_COMPLETE: 431 client = battery_service_get_client_for_con_handle(gatt_event_query_complete_get_handle(packet)); 432 btstack_assert(client != NULL); 433 434 status = gatt_event_query_complete_get_att_status(packet); 435 switch (client->state){ 436 case BATTERY_SERVICE_CLIENT_STATE_W4_SERVICE_RESULT: 437 if (status != ATT_ERROR_SUCCESS){ 438 battery_service_emit_connection_established(client, status); 439 battery_service_finalize_client(client); 440 return; 441 } 442 443 if (client->num_instances == 0){ 444 battery_service_emit_connection_established(client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 445 battery_service_finalize_client(client); 446 return; 447 } 448 449 client->service_index = 0; 450 client->state = BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_CHARACTERISTICS; 451 break; 452 453 case BATTERY_SERVICE_CLIENT_STATE_W4_CHARACTERISTIC_RESULT: 454 if (status != ATT_ERROR_SUCCESS){ 455 battery_service_emit_connection_established(client, status); 456 battery_service_finalize_client(client); 457 return; 458 } 459 460 // check if there is another service to query 461 if ((client->service_index + 1) < client->num_instances){ 462 client->service_index++; 463 client->state = BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_CHARACTERISTICS; 464 break; 465 } 466 467 battery_service_client_validate_service(client); 468 469 if (client->num_instances == 0){ 470 battery_service_emit_connection_established(client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); 471 battery_service_finalize_client(client); 472 return; 473 } 474 475 // we are done with quering all services 476 client->service_index = 0; 477 478 #ifdef ENABLE_TESTING_SUPPORT 479 client->state = BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_CHARACTERISTIC_DESCRIPTORS; 480 #else 481 // wait for notification registration 482 // to send connection established event 483 client->state = BATTERY_SERVICE_CLIENT_STATE_W2_REGISTER_NOTIFICATION; 484 #endif 485 break; 486 487 #ifdef ENABLE_TESTING_SUPPORT 488 case BATTERY_SERVICE_CLIENT_STATE_W4_CHARACTERISTIC_DESCRIPTORS_RESULT: 489 if ((client->service_index + 1) < client->num_instances){ 490 client->service_index++; 491 client->state = BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_CHARACTERISTIC_DESCRIPTORS; 492 break; 493 } 494 client->service_index = 0; 495 client->state = BATTERY_SERVICE_CLIENT_STATE_W2_REGISTER_NOTIFICATION; 496 break; 497 498 case BATTERY_SERVICE_CLIENT_W4_CHARACTERISTIC_CONFIGURATION_RESULT: 499 client->state = BATTERY_SERVICE_CLIENT_STATE_CONNECTED; 500 battery_service_emit_connection_established(client, ERROR_CODE_SUCCESS); 501 battery_service_start_polling_if_needed(client); 502 break; 503 #endif 504 case BATTERY_SERVICE_CLIENT_STATE_W4_NOTIFICATION_REGISTERED: 505 if ((client->service_index + 1) < client->num_instances){ 506 client->service_index++; 507 client->state = BATTERY_SERVICE_CLIENT_STATE_W2_REGISTER_NOTIFICATION; 508 break; 509 } 510 #ifdef ENABLE_TESTING_SUPPORT 511 for (client->service_index = 0; client->service_index < client->num_instances; client->service_index++){ 512 bool need_polling = (client->poll_bitmap & (1 << client->service_index)) != 0; 513 printf("read CCC 1 0x%02x, polling %d \n", client->services[client->service_index].ccc_handle, (int) need_polling); 514 if ( (client->services[client->service_index].ccc_handle != 0) && !need_polling ) { 515 client->state = BATTERY_SERVICE_CLIENT_W2_READ_CHARACTERISTIC_CONFIGURATION; 516 break; 517 } 518 } 519 #endif 520 client->state = BATTERY_SERVICE_CLIENT_STATE_CONNECTED; 521 battery_service_emit_connection_established(client, ERROR_CODE_SUCCESS); 522 battery_service_start_polling_if_needed(client); 523 break; 524 525 case BATTERY_SERVICE_CLIENT_STATE_CONNECTED: 526 if (client->polled_service_index != BATTERY_SERVICE_INVALID_INDEX){ 527 if (status != ATT_ERROR_SUCCESS){ 528 battery_service_emit_battery_level(client, client->services[client->polled_service_index].value_handle, status, 0); 529 } 530 client->polled_service_index = BATTERY_SERVICE_INVALID_INDEX; 531 } 532 break; 533 534 default: 535 break; 536 537 } 538 break; 539 540 541 default: 542 break; 543 } 544 545 if (client != NULL){ 546 battery_service_run_for_client(client); 547 } 548 } 549 550 551 uint8_t battery_service_client_connect(hci_con_handle_t con_handle, btstack_packet_handler_t packet_handler, uint32_t poll_interval_ms, uint16_t * battery_service_cid){ 552 btstack_assert(packet_handler != NULL); 553 554 battery_service_client_t * client = battery_service_get_client_for_con_handle(con_handle); 555 if (client != NULL){ 556 return ERROR_CODE_COMMAND_DISALLOWED; 557 } 558 559 uint16_t cid = battery_service_get_next_cid(); 560 if (battery_service_cid != NULL) { 561 *battery_service_cid = cid; 562 } 563 564 client = battery_service_create_client(con_handle, cid); 565 if (client == NULL) { 566 return BTSTACK_MEMORY_ALLOC_FAILED; 567 } 568 569 client->client_handler = packet_handler; 570 client->poll_interval_ms = poll_interval_ms; 571 client->state = BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_SERVICE; 572 battery_service_run_for_client(client); 573 return ERROR_CODE_SUCCESS; 574 } 575 576 uint8_t battery_service_client_disconnect(uint16_t battery_service_cid){ 577 battery_service_client_t * client = battery_service_get_client_for_cid(battery_service_cid); 578 if (client == NULL){ 579 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 580 } 581 // finalize connections 582 battery_service_finalize_client(client); 583 return ERROR_CODE_SUCCESS; 584 } 585 586 uint8_t battery_service_client_read_battery_level(uint16_t battery_service_cid, uint8_t service_index){ 587 battery_service_client_t * client = battery_service_get_client_for_cid(battery_service_cid); 588 if (client == NULL) { 589 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 590 } 591 if (client->state != BATTERY_SERVICE_CLIENT_STATE_CONNECTED) { 592 return GATT_CLIENT_IN_WRONG_STATE; 593 } 594 if (service_index >= client->num_instances) { 595 return ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE; 596 } 597 598 client->need_poll_bitmap |= (1u << service_index); 599 battery_service_run_for_client(client); 600 return ERROR_CODE_SUCCESS; 601 } 602 603 void battery_service_client_init(void){} 604 605 void battery_service_client_deinit(void){ 606 battery_service_cid_counter = 0; 607 clients = NULL; 608 } 609 610