ESP32C3 蓝牙通信程序

以下是一个 ESP32C3 蓝牙通信程序的示例代码，其中使用了 ESP32C3 IDF 中的蓝牙 API：

#include <stdio.h>
#include "esp_bt.h"
#include "esp_gap_ble_api.h"

#define GATTS_TAG "GATTS_DEMO"

static uint8_t adv_data[30] = {
    0x02, 0x01, 0x06, // flags
    0x03, 0x03, 0xAA, 0xFE, // 16-bit service UUID
    0x0F, 0x09, 'E', 'S', 'P', '3', '2', 'C', '3', ' ', 'B', 'L', 'E', '-', 'T', 'E', 'S', 'T' // complete name
};

static uint8_t test_service_uuid[16] = {
    /* LSB <--------------------------------------------------------------------------------> MSB */
    // first uuid, 16bit, [12],[13] is the value
    0x12,0x34,
    // 2nd uuid, 32bit, [12],..,[15] is the value, 0x12345678
    0x78,0x56,0x34,0x12,
    // 3rd uuid, 128bit, [12],..,[15] is the value, 0x00112233-4455-6677-8899-AABBCCDDEEFF
    0x33,0x22,0x11,0x00,0x55,0x44,0x77,0x66,
    0x88,0x99,0xAA,0xBB,0xCC,0xDD,0xEE,0xFF,
};

static esp_ble_adv_params_t adv_params = {
    .adv_int_min        = 0x20,
    .adv_int_max        = 0x40,
    .adv_type           = ADV_TYPE_NONCONN_IND,
    .own_addr_type      = BLE_ADDR_TYPE_PUBLIC,
    .channel_map        = ADV_CHNL_ALL,
    .adv_filter_policy  = ADV_FILTER_ALLOW_SCAN_ANY_CON_ANY,
};

static void gap_event_handler(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param)
{
    switch (event) {
    case ESP_GAP_BLE_ADV_DATA_SET_COMPLETE_EVT:
        esp_ble_gap_start_advertising(&adv_params);
        break;
    default:
        break;
    }
}

void app_main()
{
    esp_err_t ret;
    esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
    esp_bt_controller_init(&bt_cfg);
    esp_bt_controller_enable(ESP_BT_MODE_BTDM);

    esp_bluedroid_init();
    esp_bluedroid_enable();

    ret = esp_ble_gap_register_callback(gap_event_handler);
    if (ret) {
        printf("%s gap register failed, error code = %x\n", __func__, ret);
        return;
    }

    ret = esp_ble_gap_set_device_name("ESP32C3 BLE Test");
    if (ret) {
        printf("%s gap set device name failed, error code = %x\n", __func__, ret);
        return;
    }

    ret = esp_ble_gap_config_adv_data_raw(adv_data, sizeof(adv_data));
    if (ret) {
        printf("%s gap config adv data failed, error code = %x\n", __func__, ret);
        return;
    }

    esp_ble_uuid_t service_uuid;
    esp_bt_uuid_t uuid_obj;
    uuid_obj.len = ESP_UUID_LEN_128;
    memcpy(uuid_obj.uuid.uuid128, test_service_uuid, ESP_UUID_LEN_128);
    esp_ble_uuid_convert(&uuid_obj, &service_uuid);

    ret = esp_ble_gatts_create_service(&service_uuid, ESP_GATT_SVC_TYPE_PRIMARY, 0x40, &gatts_if);
    if (ret) {
        printf("%s gatts create service failed, error code = %x\n", __func__, ret);
        return;
    }

    ret = esp_ble_gatts_start_service(gatts_if);
    if (ret) {
        printf("%s gatts start service failed, error code = %x\n", __func__, ret);
        return;
    }

    printf("ESP32C3 BLE Test started\n");
}

这个示例程序实现了一个简单的 BLE 广播和 GATT 服务，其中包括：

- 设置广播数据和参数
- 注册 GAP 事件回调函数
- 注册 GATT 服务和特征
- 启动 BLE 广播和 GATT 服务

通过修改代码，你可以自定义自己的 BLE 广播和 GATT 服务。