/* * SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Unlicense OR CC0-1.0 */ /**************************************************************************** * * This demo showcases BLE GATT client. It can scan BLE devices and connect to one device. * Run the gatt_server demo, the client demo will automatically connect to the gatt_server demo. * Client demo will enable gatt_server's notify after connection. The two devices will then exchange * data. * ****************************************************************************/ #include #include #include #include #include "nvs.h" #include "nvs_flash.h" #include "esp_bt.h" #include "esp_gap_ble_api.h" #include "esp_gattc_api.h" #include "esp_gatt_defs.h" #include "esp_bt_main.h" #include "esp_gatt_common_api.h" #include "esp_log.h" #include "freertos/FreeRTOS.h" #define GATTC_TAG "GATTC_DEMO" #define REMOTE_SERVICE_UUID 0x00FF #define REMOTE_NOTIFY_CHAR_UUID 0xFF01 #define PROFILE_NUM 1 #define PROFILE_A_APP_ID 0 #define INVALID_HANDLE 0 static const char remote_device_name[] = "ESP_GATTS_DEMO"; static bool connect = false; static bool get_server = false; static esp_gattc_char_elem_t *char_elem_result = NULL; static esp_gattc_descr_elem_t *descr_elem_result = NULL; /* Declare static functions */ static void esp_gap_cb(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param); static void esp_gattc_cb(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param); static void gattc_profile_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param); //服务 static esp_bt_uuid_t remote_filter_service_uuid = { .len = ESP_UUID_LEN_16, .uuid = {.uuid16 = REMOTE_SERVICE_UUID,}, }; //特性 static esp_bt_uuid_t remote_filter_char_uuid = { .len = ESP_UUID_LEN_16, .uuid = {.uuid16 = REMOTE_NOTIFY_CHAR_UUID,}, }; //描述符 static esp_bt_uuid_t notify_descr_uuid = { .len = ESP_UUID_LEN_16, .uuid = {.uuid16 = ESP_GATT_UUID_CHAR_CLIENT_CONFIG,}, }; static esp_ble_scan_params_t ble_scan_params = { .scan_type = BLE_SCAN_TYPE_ACTIVE,//主动扫描 .own_addr_type = BLE_ADDR_TYPE_PUBLIC,// .scan_filter_policy = BLE_SCAN_FILTER_ALLOW_ALL,//扫描所有设备 .scan_interval = 0x50, .scan_window = 0x30, .scan_duplicate = BLE_SCAN_DUPLICATE_DISABLE//禁用重复扫描 }; //esp_gattc_cb_t gattc_cb;：这是一个回调函数类型，用于处理来自GATT客户端的事件。当某些事件（如连接状态改变、属性读写完成等）发生时，系统会调用这个回调函数，并传递相关的事件信息。 //uint16_t gattc_if;： 这通常是GATT客户端的接口ID，用于在多个GATT客户端实例之间进行区分。 //uint16_t app_id;： 应用程序ID，用于标识这个GATT客户端实例所属的应用程序。 //uint16_t conn_id;： 连接ID，用于标识特定的BLE连接。当设备之间建立BLE连接时，系统会为该连接分配一个唯一的ID。 //uint16_t service_start_handle, service_end_handle;：这两个字段定义了远程设备上一个服务（Service）的句柄范围。句柄是GATT协议中用于唯一标识属性（如服务、特性、描述符）的数字。 //uint16_t char_handle;： 这是远程设备上某个特性（Characteristic）的句柄。特性是服务中的一个属性，它包含了实际的数据值。 //esp_bd_addr_t remote_bda;：这是一个结构体，用于存储远程设备的蓝牙设备地址（BD_ADDR）。这个地址是唯一的，用于在BLE网络中标识和定位远程设备。 struct gattc_profile_inst { esp_gattc_cb_t gattc_cb; uint16_t gattc_if; uint16_t app_id; uint16_t conn_id; uint16_t service_start_handle; uint16_t service_end_handle; uint16_t char_handle; esp_bd_addr_t remote_bda; }; /* One gatt-based profile one app_id and one gattc_if, this array will store the gattc_if returned by ESP_GATTS_REG_EVT */ static struct gattc_profile_inst gl_profile_tab[PROFILE_NUM] = { [PROFILE_A_APP_ID] = { .gattc_cb = gattc_profile_event_handler, .gattc_if = ESP_GATT_IF_NONE, /* Not get the gatt_if, so initial is ESP_GATT_IF_NONE */ }, }; static void gattc_profile_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param) { esp_ble_gattc_cb_param_t *p_data = (esp_ble_gattc_cb_param_t *)param; switch (event) { case ESP_GATTC_REG_EVT:// 当GATT客户端注册成功时触发 ESP_LOGI(GATTC_TAG, "REG_EVT"); esp_err_t scan_ret = esp_ble_gap_set_scan_params(&ble_scan_params); if (scan_ret){ ESP_LOGE(GATTC_TAG, "set scan params error, error code = %x", scan_ret); } break; case ESP_GATTC_CONNECT_EVT:{// 当GATT客户端连接成功时触发 ESP_LOGI(GATTC_TAG, "ESP_GATTC_CONNECT_EVT conn_id %d, if %d", p_data->connect.conn_id, gattc_if); gl_profile_tab[PROFILE_A_APP_ID].conn_id = p_data->connect.conn_id; memcpy(gl_profile_tab[PROFILE_A_APP_ID].remote_bda, p_data->connect.remote_bda, sizeof(esp_bd_addr_t)); ESP_LOGI(GATTC_TAG, "REMOTE BDA:"); esp_log_buffer_hex(GATTC_TAG, gl_profile_tab[PROFILE_A_APP_ID].remote_bda, sizeof(esp_bd_addr_t)); esp_err_t mtu_ret = esp_ble_gattc_send_mtu_req (gattc_if, p_data->connect.conn_id); if (mtu_ret){ ESP_LOGE(GATTC_TAG, "config MTU error, error code = %x", mtu_ret); } break; } case ESP_GATTC_OPEN_EVT://打开时触发 if (param->open.status != ESP_GATT_OK){ ESP_LOGE(GATTC_TAG, "open failed, status %d", p_data->open.status); break; } ESP_LOGI(GATTC_TAG, "open success"); break; case ESP_GATTC_DIS_SRVC_CMPL_EVT: if (param->dis_srvc_cmpl.status != ESP_GATT_OK){ ESP_LOGE(GATTC_TAG, "discover service failed, status %d", param->dis_srvc_cmpl.status); break; } ESP_LOGI(GATTC_TAG, "discover service complete conn_id %d", param->dis_srvc_cmpl.conn_id); esp_ble_gattc_search_service(gattc_if, param->dis_srvc_cmpl.conn_id, &remote_filter_service_uuid); break; case ESP_GATTC_CFG_MTU_EVT://当MTU大小配置完成时触发 if (param->cfg_mtu.status != ESP_GATT_OK){ ESP_LOGE(GATTC_TAG,"config mtu failed, error status = %x", param->cfg_mtu.status); } ESP_LOGI(GATTC_TAG, "ESP_GATTC_CFG_MTU_EVT, Status %d, MTU %d, conn_id %d", param->cfg_mtu.status, param->cfg_mtu.mtu, param->cfg_mtu.conn_id); break;// 当发现服务时触发 case ESP_GATTC_SEARCH_RES_EVT: { ESP_LOGI(GATTC_TAG, "SEARCH RES: conn_id = %x is primary service %d", p_data->search_res.conn_id, p_data->search_res.is_primary); ESP_LOGI(GATTC_TAG, "start handle %d end handle %d current handle value %d", p_data->search_res.start_handle, p_data->search_res.end_handle, p_data->search_res.srvc_id.inst_id); if (p_data->search_res.srvc_id.uuid.len == ESP_UUID_LEN_16 && p_data->search_res.srvc_id.uuid.uuid.uuid16 == REMOTE_SERVICE_UUID) { ESP_LOGI(GATTC_TAG, "service found"); get_server = true; gl_profile_tab[PROFILE_A_APP_ID].service_start_handle = p_data->search_res.start_handle; gl_profile_tab[PROFILE_A_APP_ID].service_end_handle = p_data->search_res.end_handle; ESP_LOGI(GATTC_TAG, "UUID16: %x", p_data->search_res.srvc_id.uuid.uuid.uuid16); } break; } case ESP_GATTC_SEARCH_CMPL_EVT:// 当服务搜索完成时触发 if (p_data->search_cmpl.status != ESP_GATT_OK){ ESP_LOGE(GATTC_TAG, "search service failed, error status = %x", p_data->search_cmpl.status); break; } if(p_data->search_cmpl.searched_service_source == ESP_GATT_SERVICE_FROM_REMOTE_DEVICE) { ESP_LOGI(GATTC_TAG, "Get service information from remote device"); } else if (p_data->search_cmpl.searched_service_source == ESP_GATT_SERVICE_FROM_NVS_FLASH) { ESP_LOGI(GATTC_TAG, "Get service information from flash"); } else { ESP_LOGI(GATTC_TAG, "unknown service source"); } ESP_LOGI(GATTC_TAG, "ESP_GATTC_SEARCH_CMPL_EVT"); if (get_server){ uint16_t count = 0; esp_gatt_status_t status = esp_ble_gattc_get_attr_count( gattc_if, p_data->search_cmpl.conn_id, ESP_GATT_DB_CHARACTERISTIC, gl_profile_tab[PROFILE_A_APP_ID].service_start_handle, gl_profile_tab[PROFILE_A_APP_ID].service_end_handle, INVALID_HANDLE, &count); if (status != ESP_GATT_OK){ ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_attr_count error"); } if (count > 0){ char_elem_result = (esp_gattc_char_elem_t *)malloc(sizeof(esp_gattc_char_elem_t) * count); if (!char_elem_result){ ESP_LOGE(GATTC_TAG, "gattc no mem"); }else{ status = esp_ble_gattc_get_char_by_uuid( gattc_if, p_data->search_cmpl.conn_id, gl_profile_tab[PROFILE_A_APP_ID].service_start_handle, gl_profile_tab[PROFILE_A_APP_ID].service_end_handle, remote_filter_char_uuid, char_elem_result, &count); if (status != ESP_GATT_OK){ ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_char_by_uuid error"); } /* Every service have only one char in our 'ESP_GATTS_DEMO' demo, so we used first 'char_elem_result' */ if (count > 0 && (char_elem_result[0].properties & ESP_GATT_CHAR_PROP_BIT_NOTIFY)){ gl_profile_tab[PROFILE_A_APP_ID].char_handle = char_elem_result[0].char_handle; esp_ble_gattc_register_for_notify (gattc_if, gl_profile_tab[PROFILE_A_APP_ID].remote_bda, char_elem_result[0].char_handle); } } /* free char_elem_result */ free(char_elem_result); }else{ ESP_LOGE(GATTC_TAG, "no char found"); } } break; case ESP_GATTC_REG_FOR_NOTIFY_EVT: { ESP_LOGI(GATTC_TAG, "ESP_GATTC_REG_FOR_NOTIFY_EVT"); if (p_data->reg_for_notify.status != ESP_GATT_OK){ ESP_LOGE(GATTC_TAG, "REG FOR NOTIFY failed: error status = %d", p_data->reg_for_notify.status); }else{ uint16_t count = 0; uint16_t notify_en = 1; esp_gatt_status_t ret_status = esp_ble_gattc_get_attr_count( gattc_if, gl_profile_tab[PROFILE_A_APP_ID].conn_id, ESP_GATT_DB_DESCRIPTOR, gl_profile_tab[PROFILE_A_APP_ID].service_start_handle, gl_profile_tab[PROFILE_A_APP_ID].service_end_handle, gl_profile_tab[PROFILE_A_APP_ID].char_handle, &count); if (ret_status != ESP_GATT_OK){ ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_attr_count error"); } if (count > 0){ descr_elem_result = malloc(sizeof(esp_gattc_descr_elem_t) * count); if (!descr_elem_result){ ESP_LOGE(GATTC_TAG, "malloc error, gattc no mem"); }else{ ret_status = esp_ble_gattc_get_descr_by_char_handle( gattc_if, gl_profile_tab[PROFILE_A_APP_ID].conn_id, p_data->reg_for_notify.handle, notify_descr_uuid, descr_elem_result, &count); if (ret_status != ESP_GATT_OK){ ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_descr_by_char_handle error"); } /* Every char has only one descriptor in our 'ESP_GATTS_DEMO' demo, so we used first 'descr_elem_result' */ if (count > 0 && descr_elem_result[0].uuid.len == ESP_UUID_LEN_16 && descr_elem_result[0].uuid.uuid.uuid16 == ESP_GATT_UUID_CHAR_CLIENT_CONFIG){ ret_status = esp_ble_gattc_write_char_descr( gattc_if, gl_profile_tab[PROFILE_A_APP_ID].conn_id, descr_elem_result[0].handle, sizeof(notify_en), (uint8_t *)¬ify_en, ESP_GATT_WRITE_TYPE_RSP, ESP_GATT_AUTH_REQ_NONE); } if (ret_status != ESP_GATT_OK){ ESP_LOGE(GATTC_TAG, "esp_ble_gattc_write_char_descr error"); } /* free descr_elem_result */ free(descr_elem_result); } } else{ ESP_LOGE(GATTC_TAG, "decsr not found"); } } break; } case ESP_GATTC_NOTIFY_EVT:// 当收到通知时触发 if (p_data->notify.is_notify){ ESP_LOGI(GATTC_TAG, "ESP_GATTC_NOTIFY_EVT, receive notify value:"); }else{ ESP_LOGI(GATTC_TAG, "ESP_GATTC_NOTIFY_EVT, receive indicate value:"); } esp_log_buffer_hex(GATTC_TAG, p_data->notify.value, p_data->notify.value_len); break; case ESP_GATTC_WRITE_DESCR_EVT: if (p_data->write.status != ESP_GATT_OK){ ESP_LOGE(GATTC_TAG, "write descr failed, error status = %x", p_data->write.status); break; } ESP_LOGI(GATTC_TAG, "write descr success "); uint8_t write_char_data[35]; for (int i = 0; i < sizeof(write_char_data); ++i) { write_char_data[i] = i % 256; } esp_ble_gattc_write_char( gattc_if, gl_profile_tab[PROFILE_A_APP_ID].conn_id, gl_profile_tab[PROFILE_A_APP_ID].char_handle, sizeof(write_char_data), write_char_data, ESP_GATT_WRITE_TYPE_RSP, ESP_GATT_AUTH_REQ_NONE); break; case ESP_GATTC_SRVC_CHG_EVT: { esp_bd_addr_t bda; memcpy(bda, p_data->srvc_chg.remote_bda, sizeof(esp_bd_addr_t)); ESP_LOGI(GATTC_TAG, "ESP_GATTC_SRVC_CHG_EVT, bd_addr:"); esp_log_buffer_hex(GATTC_TAG, bda, sizeof(esp_bd_addr_t)); break; } case ESP_GATTC_WRITE_CHAR_EVT: // 当写入特性完成时触发 if (p_data->write.status != ESP_GATT_OK){ ESP_LOGE(GATTC_TAG, "write char failed, error status = %x", p_data->write.status); break; } ESP_LOGI(GATTC_TAG, "write char success "); break; case ESP_GATTC_DISCONNECT_EVT: connect = false; get_server = false; ESP_LOGI(GATTC_TAG, "ESP_GATTC_DISCONNECT_EVT, reason = %d", p_data->disconnect.reason); break; default: break; } } //GAP层 这些事件可能包括设备扫描结果、连接状态变化、认证请求等。 uint8_t ID01[64] = {0}; uint8_t ID01_Len = 0; static void esp_gap_cb(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param) { uint8_t *adv_name = NULL; uint8_t adv_name_len = 0; uint8_t i = 0; switch (event) { case ESP_GAP_BLE_SCAN_PARAM_SET_COMPLETE_EVT: {//BLE 扫描参数设置操作已经完成 //the unit of the duration is second uint32_t duration = 0; esp_ble_gap_start_scanning(duration);//启动扫描 break; } case ESP_GAP_BLE_SCAN_START_COMPLETE_EVT://用于表示扫描操作的开始或完成状态。 //scan start complete event to indicate scan start successfully or failed if (param->scan_start_cmpl.status != ESP_BT_STATUS_SUCCESS) { ESP_LOGE(GATTC_TAG, "scan start failed, error status = %x", param->scan_start_cmpl.status); break; } ESP_LOGI(GATTC_TAG, "scan start success"); break; case ESP_GAP_BLE_SCAN_RESULT_EVT: {//扫描到设备 esp_ble_gap_cb_param_t *scan_result = (esp_ble_gap_cb_param_t *)param; switch (scan_result->scan_rst.search_evt) { case ESP_GAP_SEARCH_INQ_RES_EVT://用于在设备执行蓝牙扫描时报告发现的结果。在扫描过程中发现一个或多个BLE设备时，会触发这个事件 //esp_log_buffer_hex(GATTC_TAG, scan_result->scan_rst.bda, 6);//尤其是当你需要查看设备地址、UUID ,Mac地址。 //if((scan_result->scan_rst.bda[4] == 0x22)||(scan_result->scan_rst.bda[4] == 0x1c)) { //ESP_LOGI(GATTC_TAG, "searched Adv Data Len %d, Scan Response Len %d", scan_result->scan_rst.adv_data_len, scan_result->scan_rst.scan_rsp_len); //adv_name = esp_ble_resolve_adv_data(scan_result->scan_rst.ble_adv,ESP_BLE_AD_TYPE_NAME_CMPL, &adv_name_len); //ESP_LOGI(GATTC_TAG, "searched Device Name Len %d", adv_name_len); //esp_log_buffer_char(GATTC_TAG, adv_name, adv_name_len); //printf("scan_result->scan_rst.adv_data_len = %d\r\n",scan_result->scan_rst.adv_data_len); // //tpms名字 //printf("222222222222222222222222222222222 = %x \r\n",scan_result->scan_rst.ble_adv[2]); // printf("333333333333333333333333333333333 = %x \r\n",scan_result->scan_rst.ble_adv[3]); // printf("444444444444444444444444444444444 = %x \r\n",scan_result->scan_rst.ble_adv[4]); // printf("555555555555555555555555555555555 = %x \r\n",scan_result->scan_rst.ble_adv[5]); // printf("666666666666666666666666666666666 = %x \r\n",scan_result->scan_rst.ble_adv[6]); // printf("777777777777777777777777777777777 = %x \r\n",scan_result->scan_rst.ble_adv[7]); // printf("888888888888888888888888888888888 = %x \r\n",scan_result->scan_rst.ble_adv[8]); // //mac // printf("16 = %x \r\n",scan_result->scan_rst.ble_adv[16]); // printf("17 = %x \r\n",scan_result->scan_rst.ble_adv[17]); // printf("18 = %x \r\n",scan_result->scan_rst.ble_adv[18]); // printf("19 = %x \r\n",scan_result->scan_rst.ble_adv[19]); // printf("20 = %x \r\n",scan_result->scan_rst.ble_adv[20]); // printf("21 = %x \r\n",scan_result->scan_rst.ble_adv[21]); if((scan_result->scan_rst.ble_adv[2] == 0x54)&& (scan_result->scan_rst.ble_adv[3] == 0x43)&& (scan_result->scan_rst.ble_adv[4] == 0x2E)&& (scan_result->scan_rst.ble_adv[5] == 0x54)&& (scan_result->scan_rst.ble_adv[6] == 0x50)&& (scan_result->scan_rst.ble_adv[7] == 0x4D)&& (scan_result->scan_rst.ble_adv[8] == 0x53)) { //esp_log_buffer_hex("tpms",scan_result->scan_rst.ble_adv,scan_result->scan_rst.adv_data_len); //printf("99999999999999999999999999 \r\n"); ID01_Len = scan_result->scan_rst.adv_data_len; for(i = 0; i < scan_result->scan_rst.adv_data_len; i++) { ID01[i] = scan_result->scan_rst.ble_adv[i]; } } //printf("地址：%x \r\n",scan_result->scan_rst.bda[4]); } #if CONFIG_EXAMPLE_DUMP_ADV_DATA_AND_SCAN_RESP if (scan_result->scan_rst.adv_data_len > 0) { ESP_LOGI(GATTC_TAG, "adv data:"); esp_log_buffer_hex(GATTC_TAG, &scan_result->scan_rst.ble_adv[0], scan_result->scan_rst.adv_data_len); } if (scan_result->scan_rst.scan_rsp_len > 0) { ESP_LOGI(GATTC_TAG, "scan resp:"); esp_log_buffer_hex(GATTC_TAG, &scan_result->scan_rst.ble_adv[scan_result->scan_rst.adv_data_len], scan_result->scan_rst.scan_rsp_len); } #endif //ESP_LOGI(GATTC_TAG, "\n"); if (adv_name != NULL) { if (strlen(remote_device_name) == adv_name_len && strncmp((char *)adv_name, remote_device_name, adv_name_len) == 0) { ESP_LOGI(GATTC_TAG, "searched device %s\n", remote_device_name); if (connect == false) { connect = true; ESP_LOGI(GATTC_TAG, "connect to the remote device."); esp_ble_gap_stop_scanning(); esp_ble_gattc_open(gl_profile_tab[PROFILE_A_APP_ID].gattc_if, scan_result->scan_rst.bda, scan_result->scan_rst.ble_addr_type, true); } } } break; case ESP_GAP_SEARCH_INQ_CMPL_EVT://用于控制扫描的持续时间和重启扫描 break; default: break; } break; } case ESP_GAP_BLE_SCAN_STOP_COMPLETE_EVT: if (param->scan_stop_cmpl.status != ESP_BT_STATUS_SUCCESS){ ESP_LOGE(GATTC_TAG, "scan stop failed, error status = %x", param->scan_stop_cmpl.status);//扫描停止失败，进行错误处理 break; } ESP_LOGI(GATTC_TAG, "stop scan successfully");//扫描成功停止，可以进行后续操作，如重启扫描、连接其他设备等 break; case ESP_GAP_BLE_ADV_STOP_COMPLETE_EVT:// ESP32 蓝牙设备成功或失败地停止其广告活动时，此事件会被触发。 if (param->adv_stop_cmpl.status != ESP_BT_STATUS_SUCCESS){ ESP_LOGE(GATTC_TAG, "adv stop failed, error status = %x", param->adv_stop_cmpl.status); break; } ESP_LOGI(GATTC_TAG, "stop adv successfully"); break; case ESP_GAP_BLE_UPDATE_CONN_PARAMS_EVT://连接参数被更新或请求更新时触发 ESP_LOGI(GATTC_TAG, "update connection params status = %d, min_int = %d, max_int = %d,conn_int = %d,latency = %d, timeout = %d", param->update_conn_params.status, param->update_conn_params.min_int, param->update_conn_params.max_int, param->update_conn_params.conn_int, param->update_conn_params.latency, param->update_conn_params.timeout); break; default: break; } } //您的代码段描述了一个esp_gattc_cb函数，该函数是ESP-IDF中BLE GATT客户端（GATT Client）的回调函数。 //该函数处理从BLE堆栈发送过来的各种事件，并且对于特定的配置文件（profile）， //它会将gattc_if（GATT客户端接口）存储起来，并调用相应配置文件的回调函数 static void esp_gattc_cb(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param) { /* If event is register event, store the gattc_if for each profile */ //如果状态为ESP_GATT_OK（表示注册成功），它会将gattc_if存储到gl_profile_tab数组中对应app_id的条目里。 //gl_profile_tab看起来是一个全局数组，用于存储所有配置文件的信息，包括gattc_if。 if (event == ESP_GATTC_REG_EVT) {//（即GATT客户端注册事件）时，函数会检查注册状态。 if (param->reg.status == ESP_GATT_OK) { gl_profile_tab[param->reg.app_id].gattc_if = gattc_if; } else { ESP_LOGI(GATTC_TAG, "reg app failed, app_id %04x, status %d", param->reg.app_id, param->reg.status); return; } } /* If the gattc_if equal to profile A, call profile A cb handler, * so here call each profile's callback */ do { int idx; for (idx = 0; idx < PROFILE_NUM; idx++) { if (gattc_if == ESP_GATT_IF_NONE || /* ESP_GATT_IF_NONE, not specify a certain gatt_if, need to call every profile cb function */ gattc_if == gl_profile_tab[idx].gattc_if) { if (gl_profile_tab[idx].gattc_cb) { gl_profile_tab[idx].gattc_cb(event, gattc_if, param); } } } } while (0); } void app_tpms_main(void) { // Initialize NVS. esp_err_t ret; //register the callback function to the gap module ret = esp_ble_gap_register_callback(esp_gap_cb); if (ret){ ESP_LOGE(GATTC_TAG, "%s gap register failed, error code = %x\n", __func__, ret); return; } //register the callback function to the gattc module ret = esp_ble_gattc_register_callback(esp_gattc_cb); if(ret){ ESP_LOGE(GATTC_TAG, "%s gattc register failed, error code = %x\n", __func__, ret); return; } ret = esp_ble_gattc_app_register(PROFILE_A_APP_ID); if (ret){ ESP_LOGE(GATTC_TAG, "%s gattc app register failed, error code = %x\n", __func__, ret); } esp_err_t local_mtu_ret = esp_ble_gatt_set_local_mtu(500); if (local_mtu_ret){ ESP_LOGE(GATTC_TAG, "set local MTU failed, error code = %x", local_mtu_ret); } }