13. bluetooth

例程说明简介： 手机APP与开发板进行蓝牙通讯并相互发送消息
开发板接收数据：在手机APP中输入要发送的消息，单击发送按钮，开发板会打印输出收到的消息及16进制数据；
开发板发送数据：轻按开发板上的白色BOOT键，手机中消息列表中会收到开发板发来的消息
调试过程:使用手机APP ”e调试“ 进行测试；
编译不通过请打开ESPIDF的工程设置开启蓝牙4.2。

main.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_log.h"
#include "nvs_flash.h"
#include "esp_bt.h"
#include "esp_chip_info.h"
#include "spi_flash_mmap.h"
#include "esp_flash.h"
#include "hal/efuse_hal.h"
#include "nvs_flash.h"
#include "esp_gap_ble_api.h"
#include "esp_gatts_api.h"
#include "esp_bt_defs.h"
#include "esp_bt_main.h"
#include "esp_gatt_common_api.h"
#include "esp_bt_device.h"

#include "sdkconfig.h"
#include "driver/gpio.h"

// #include "KEY.h"

#define TAG "GATTS_DEMO"
// #include "driver/gpio.h"
// #define KEY_GPIO     0       //按钮连接的GPIO，这里使用BOOT引脚GPIO0
// bool BluetoothConnStatus = false;
// uint8_t BLEReadDataBuff[512];

// uint8_t Current_gatts_if;
// uint16_t Current_conn_id;

bool BluetoothConnStatus = false;
uint8_t BLEReadDataBuff[512];

uint8_t Current_gatts_if;
uint16_t Current_conn_id;

// GATT 协议创建两个服务
// A、B两个服务事件处理函数，声明为静态
static void gatts_profile_a_event_handler(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param);
static void gatts_profile_b_event_handler(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param);

// 服务A用于传感器控制与读取
#define GATTS_SERVICE_UUID_TEST_A   0x00AA
#define GATTS_CHAR_UUID_TEST_A      0xAA01
#define GATTS_DESCR_UUID_TEST_A     0x3333
#define GATTS_NUM_HANDLE_TEST_A     4

// 服务B用于聊天例程
#define GATTS_SERVICE_UUID_TEST_B   0x00BB
#define GATTS_CHAR_UUID_TEST_B      0xBB01
#define GATTS_DESCR_UUID_TEST_B     0x2222
#define GATTS_NUM_HANDLE_TEST_B     4

// 蓝牙设备名
#define TEST_DEVICE_NAME            "LCKFB"
// 制造商数据长度
#define TEST_MANUFACTURER_DATA_LEN  17
// 属性值最大长度
#define GATTS_DEMO_CHAR_VAL_LEN_MAX 0x40    // 64
// 数据包缓存最大尺寸
#define PREPARE_BUF_MAX_SIZE 1024
uint8_t RevMsg[512];

static uint8_t char1_str[] = {0x11,0x22,0x33};
static esp_gatt_char_prop_t a_property = 0;
static esp_gatt_char_prop_t b_property = 0;

static esp_attr_value_t gatts_demo_char1_val =
{
    .attr_max_len = GATTS_DEMO_CHAR_VAL_LEN_MAX,
    .attr_len     = sizeof(char1_str),
    .attr_value   = char1_str,
};

static uint8_t adv_config_done = 0;
#define adv_config_flag      (1 << 0)
#define scan_rsp_config_flag (1 << 1)

#ifdef CONFIG_SET_RAW_ADV_DATA
static uint8_t raw_adv_data[] = {
        0x02, 0x01, 0x06,0x02, 0x0a, 0xeb, 0x03, 0x03, 0xab, 0xcd
};
static uint8_t raw_scan_rsp_data[] = {
        0x0f, 0x09, 0x45, 0x53, 0x50, 0x5f, 0x47, 0x41, 0x54, 0x54, 0x53, 0x5f, 0x44,0x45, 0x4d, 0x4f
};
#else

static uint8_t adv_service_uuid128[32] = {
    /* LSB <--------------------------------------------------------------------------------> MSB */
    //first uuid, 16bit, [12],[13] is the value
    0xfb, 0x34, 0x9b, 0x5f, 0x80, 0x00, 0x00, 0x80, 0x00, 0x10, 0x00, 0x00, 0xAA, 0x00, 0x00, 0x00,
    //second uuid, 32bit, [12], [13], [14], [15] is the value
    0xfb, 0x34, 0x9b, 0x5f, 0x80, 0x00, 0x00, 0x80, 0x00, 0x10, 0x00, 0x00, 0xBB, 0x00, 0x00, 0x00,
};

// The length of adv data must be less than 31 bytes
//static uint8_t test_manufacturer[TEST_MANUFACTURER_DATA_LEN] =  {0x12, 0x23, 0x45, 0x56};
//adv data
static esp_ble_adv_data_t adv_data = {
    .set_scan_rsp = false,
    .include_name = true,
    .include_txpower = false,
    .min_interval = 0x0006, //slave connection min interval, Time = min_interval * 1.25 msec
    .max_interval = 0x0010, //slave connection max interval, Time = max_interval * 1.25 msec
    .appearance = 0x00,
    .manufacturer_len = 0, //TEST_MANUFACTURER_DATA_LEN,
    .p_manufacturer_data =  NULL, //&test_manufacturer[0],
    .service_data_len = 0,
    .p_service_data = NULL,
    .service_uuid_len = sizeof(adv_service_uuid128),
    .p_service_uuid = adv_service_uuid128,
    .flag = (ESP_BLE_ADV_FLAG_GEN_DISC | ESP_BLE_ADV_FLAG_BREDR_NOT_SPT),
};
// scan response data
static esp_ble_adv_data_t scan_rsp_data = {
    .set_scan_rsp = true,
    .include_name = true,
    .include_txpower = true,
    //.min_interval = 0x0006,
    //.max_interval = 0x0010,
    .appearance = 0x00,
    .manufacturer_len = 0, //TEST_MANUFACTURER_DATA_LEN,
    .p_manufacturer_data =  NULL, //&test_manufacturer[0],
    .service_data_len = 0,
    .p_service_data = NULL,
    .service_uuid_len = sizeof(adv_service_uuid128),
    .p_service_uuid = adv_service_uuid128,
    .flag = (ESP_BLE_ADV_FLAG_GEN_DISC | ESP_BLE_ADV_FLAG_BREDR_NOT_SPT),
};

#endif /* CONFIG_SET_RAW_ADV_DATA */

static esp_ble_adv_params_t adv_params = {
    .adv_int_min        = 0x40,
    .adv_int_max        = 0x40,
    .adv_type           = ADV_TYPE_IND,//,
    .own_addr_type      = BLE_ADDR_TYPE_PUBLIC,
    //.peer_addr            =
    //.peer_addr_type       =
    .channel_map        = ADV_CHNL_ALL,
    .adv_filter_policy = ADV_FILTER_ALLOW_SCAN_ANY_CON_ANY,
};

#define PROFILE_NUM 2
#define PROFILE_A_APP_ID 0
#define PROFILE_B_APP_ID 1

struct gatts_profile_inst {
    esp_gatts_cb_t gatts_cb;
    uint16_t gatts_if;
    uint16_t app_id;
    uint16_t conn_id;
    uint16_t service_handle;
    esp_gatt_srvc_id_t service_id;
    uint16_t char_handle;
    esp_bt_uuid_t char_uuid;
    esp_gatt_perm_t perm;
    esp_gatt_char_prop_t property;
    uint16_t descr_handle;
    esp_bt_uuid_t descr_uuid;
};

/* One gatt-based profile one app_id and one gatts_if, this array will store the gatts_if returned by ESP_GATTS_REG_EVT */
static struct gatts_profile_inst gl_profile_tab[PROFILE_NUM] = {
    [PROFILE_A_APP_ID] = {
        .gatts_cb = gatts_profile_a_event_handler,
        .gatts_if = ESP_GATT_IF_NONE,       /* Not get the gatt_if, so initial is ESP_GATT_IF_NONE */
    },
    [PROFILE_B_APP_ID] = {
        .gatts_cb = gatts_profile_b_event_handler,                   /* This demo does not implement, similar as profile A */
        .gatts_if = ESP_GATT_IF_NONE,       /* Not get the gatt_if, so initial is ESP_GATT_IF_NONE */
    },
};

typedef struct {
    uint8_t                 *prepare_buf;
    int                     prepare_len;
} prepare_type_env_t;

static prepare_type_env_t a_prepare_write_env;
static prepare_type_env_t b_prepare_write_env;

void example_write_event_env(esp_gatt_if_t gatts_if, prepare_type_env_t *prepare_write_env, esp_ble_gatts_cb_param_t *param);
void example_exec_write_event_env(prepare_type_env_t *prepare_write_env, esp_ble_gatts_cb_param_t *param);

static void gap_event_handler(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param)
{
    switch (event) {
#ifdef CONFIG_SET_RAW_ADV_DATA
    case ESP_GAP_BLE_ADV_DATA_RAW_SET_COMPLETE_EVT:
        adv_config_done &= (~adv_config_flag);
        if (adv_config_done==0){
            esp_ble_gap_start_advertising(&adv_params);
        }
        break;
    case ESP_GAP_BLE_SCAN_RSP_DATA_RAW_SET_COMPLETE_EVT:
        adv_config_done &= (~scan_rsp_config_flag);
        if (adv_config_done==0){
            esp_ble_gap_start_advertising(&adv_params);
        }
        break;
#else
    case ESP_GAP_BLE_ADV_DATA_SET_COMPLETE_EVT:
        adv_config_done &= (~adv_config_flag);
        if (adv_config_done == 0){
            esp_ble_gap_start_advertising(&adv_params);
        }
        break;
    case ESP_GAP_BLE_SCAN_RSP_DATA_SET_COMPLETE_EVT:
        adv_config_done &= (~scan_rsp_config_flag);
        if (adv_config_done == 0){
            esp_ble_gap_start_advertising(&adv_params);
        }
        break;
#endif
    case ESP_GAP_BLE_ADV_START_COMPLETE_EVT:
        //advertising start complete event to indicate advertising start successfully or failed
        if (param->adv_start_cmpl.status != ESP_BT_STATUS_SUCCESS) {
            ESP_LOGE(TAG, "Advertising start failed\n");
        }
        break;
    case ESP_GAP_BLE_ADV_STOP_COMPLETE_EVT:
        if (param->adv_stop_cmpl.status != ESP_BT_STATUS_SUCCESS) {
            ESP_LOGE(TAG, "Advertising stop failed\n");
        } else {
            ESP_LOGI(TAG, "Stop adv successfully\n");
        }
        break;
    case ESP_GAP_BLE_UPDATE_CONN_PARAMS_EVT:
        ESP_LOGI(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;
    }
}

void example_write_event_env(esp_gatt_if_t gatts_if, prepare_type_env_t *prepare_write_env, esp_ble_gatts_cb_param_t *param){
    esp_gatt_status_t status = ESP_GATT_OK;
    if (param->write.need_rsp){
        if (param->write.is_prep){
            if (prepare_write_env->prepare_buf == NULL) {
                prepare_write_env->prepare_buf = (uint8_t *)malloc(PREPARE_BUF_MAX_SIZE*sizeof(uint8_t));
                prepare_write_env->prepare_len = 0;
                if (prepare_write_env->prepare_buf == NULL) {
                    ESP_LOGE(TAG, "Gatt_server prep no mem\n");
                    status = ESP_GATT_NO_RESOURCES;
                }
            } else {
                if(param->write.offset > PREPARE_BUF_MAX_SIZE) {
                    status = ESP_GATT_INVALID_OFFSET;
                } else if ((param->write.offset + param->write.len) > PREPARE_BUF_MAX_SIZE) {
                    status = ESP_GATT_INVALID_ATTR_LEN;
                }
            }

            esp_gatt_rsp_t *gatt_rsp = (esp_gatt_rsp_t *)malloc(sizeof(esp_gatt_rsp_t));
            gatt_rsp->attr_value.len = param->write.len;
            gatt_rsp->attr_value.handle = param->write.handle;
            gatt_rsp->attr_value.offset = param->write.offset;
            gatt_rsp->attr_value.auth_req = ESP_GATT_AUTH_REQ_NONE;
            memcpy(gatt_rsp->attr_value.value, param->write.value, param->write.len);
            esp_err_t response_err = esp_ble_gatts_send_response(gatts_if, param->write.conn_id, param->write.trans_id, status, gatt_rsp);
            if (response_err != ESP_OK){
            ESP_LOGE(TAG, "Send response error\n");
            }
            free(gatt_rsp);
            if (status != ESP_GATT_OK){
                return;
            }
            memcpy(prepare_write_env->prepare_buf + param->write.offset,
                param->write.value,
                param->write.len);
            prepare_write_env->prepare_len += param->write.len;

        }else{
            esp_ble_gatts_send_response(gatts_if, param->write.conn_id, param->write.trans_id, status, NULL);
        }
    }
}

void example_exec_write_event_env(prepare_type_env_t *prepare_write_env, esp_ble_gatts_cb_param_t *param){
    if (param->exec_write.exec_write_flag == ESP_GATT_PREP_WRITE_EXEC){
        esp_log_buffer_hex(TAG, prepare_write_env->prepare_buf, prepare_write_env->prepare_len);
    }else{
        ESP_LOGI(TAG,"ESP_GATT_PREP_WRITE_CANCEL");
    }
    if (prepare_write_env->prepare_buf) {
        free(prepare_write_env->prepare_buf);
        prepare_write_env->prepare_buf = NULL;
    }
    prepare_write_env->prepare_len = 0;
}

static void gatts_profile_a_event_handler(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param) {
    switch (event) {
    case ESP_GATTS_REG_EVT:
        ESP_LOGI(TAG, "REGISTER_APP_EVT, status %d, app_id %d\n", param->reg.status, param->reg.app_id);
        gl_profile_tab[PROFILE_A_APP_ID].service_id.is_primary = true;
        gl_profile_tab[PROFILE_A_APP_ID].service_id.id.inst_id = 0x00;
        gl_profile_tab[PROFILE_A_APP_ID].service_id.id.uuid.len = ESP_UUID_LEN_16;
        gl_profile_tab[PROFILE_A_APP_ID].service_id.id.uuid.uuid.uuid16 = GATTS_SERVICE_UUID_TEST_A;

        esp_err_t set_dev_name_ret = esp_ble_gap_set_device_name(TEST_DEVICE_NAME);
        if (set_dev_name_ret){
            ESP_LOGE(TAG, "set device name failed, error code = %x", set_dev_name_ret);
        }
#ifdef CONFIG_SET_RAW_ADV_DATA
        esp_err_t raw_adv_ret = esp_ble_gap_config_adv_data_raw(raw_adv_data, sizeof(raw_adv_data));
        if (raw_adv_ret){
            ESP_LOGE(TAG, "config raw adv data failed, error code = %x ", raw_adv_ret);
        }
        adv_config_done |= adv_config_flag;
        esp_err_t raw_scan_ret = esp_ble_gap_config_scan_rsp_data_raw(raw_scan_rsp_data, sizeof(raw_scan_rsp_data));
        if (raw_scan_ret){
            ESP_LOGE(TAG, "config raw scan rsp data failed, error code = %x", raw_scan_ret);
        }
        adv_config_done |= scan_rsp_config_flag;
#else
        //config adv data
        esp_err_t ret = esp_ble_gap_config_adv_data(&adv_data);
        if (ret){
            ESP_LOGE(TAG, "config adv data failed, error code = %x", ret);
        }
        adv_config_done |= adv_config_flag;
        //config scan response data
        ret = esp_ble_gap_config_adv_data(&scan_rsp_data);
        if (ret){
            ESP_LOGE(TAG, "config scan response data failed, error code = %x", ret);
        }
        adv_config_done |= scan_rsp_config_flag;

#endif
        esp_ble_gatts_create_service(gatts_if, &gl_profile_tab[PROFILE_A_APP_ID].service_id, GATTS_NUM_HANDLE_TEST_A);
        break;
    case ESP_GATTS_READ_EVT: {// GATTS_服务器请求读取客户端信息_事件
        esp_gatt_rsp_t rsp;                         // 定义一个远程请求读取响应结构体
        memset(&rsp, 0, sizeof(esp_gatt_rsp_t));    // 清空
        rsp.attr_value.handle = param->read.handle; // 读取句柄
        rsp.attr_value.value[0] = 0x12;
        rsp.attr_value.value[1] = 0xAB;
        rsp.attr_value.len = 2;
        // 发送响应：GATT服务器访问接口，连接标识符，传输id，响应状态，响应数据
        esp_ble_gatts_send_response(gatts_if, param->read.conn_id, param->read.trans_id,ESP_GATT_OK, &rsp);
        break;
    }
    // GATT 写入事件（收到手机发送来的数据）
    case ESP_GATTS_WRITE_EVT: {
        ESP_LOGI(TAG, "GATT_WRITE_EVT, conn_id %d, trans_id %ld, handle %d", param->write.conn_id, param->write.trans_id, param->write.handle);
        if (!param->write.is_prep){
            ESP_LOGI(TAG, "GATT_WRITE_EVT, value len %d, value :", param->write.len);
            // 打印收到的数据，16进制方式

            // 设置WS2812_RGB颜色
            //SetWS2812(param->write.value[0],param->write.value[1],param->write.value[2]);

            esp_log_buffer_hex(TAG, param->write.value, param->write.len);
            if (gl_profile_tab[PROFILE_A_APP_ID].descr_handle == param->write.handle && param->write.len == 2){
                uint16_t descr_value = param->write.value[1]<<8 | param->write.value[0];
                if (descr_value == 0x0001){
                    if (a_property & ESP_GATT_CHAR_PROP_BIT_NOTIFY){
                        ESP_LOGI(TAG, "notify enable");
                        uint8_t notify_data[15];
                        for (int i = 0; i < sizeof(notify_data); ++i){
                            notify_data[i] = i%0xff;
                        }
                        //the size of notify_data[] need less than MTU size
                        esp_ble_gatts_send_indicate(gatts_if, param->write.conn_id, gl_profile_tab[PROFILE_A_APP_ID].char_handle,
                                                sizeof(notify_data), notify_data, false);
                    }
                }else if (descr_value == 0x0002){
                    if (a_property & ESP_GATT_CHAR_PROP_BIT_INDICATE){
                        ESP_LOGI(TAG, "indicate enable");
                        uint8_t indicate_data[15];
                        for (int i = 0; i < sizeof(indicate_data); ++i)
                        {
                            indicate_data[i] = i%0xff;
                        }
                        //the size of indicate_data[] need less than MTU size
                        esp_ble_gatts_send_indicate(gatts_if, param->write.conn_id, gl_profile_tab[PROFILE_A_APP_ID].char_handle,
                                                sizeof(indicate_data), indicate_data, true);
                    }
                }
                else if (descr_value == 0x0000){
                    ESP_LOGI(TAG, "notify/indicate disable ");
                }else{
                    ESP_LOGE(TAG, "unknown descr value");
                    esp_log_buffer_hex(TAG, param->write.value, param->write.len);
                }
            }
        }
        example_write_event_env(gatts_if, &a_prepare_write_env, param);
        break;
    }
    case ESP_GATTS_EXEC_WRITE_EVT:
        ESP_LOGI(TAG,"ESP_GATTS_EXEC_WRITE_EVT");
        esp_ble_gatts_send_response(gatts_if, param->write.conn_id, param->write.trans_id, ESP_GATT_OK, NULL);
        example_exec_write_event_env(&a_prepare_write_env, param);
        break;
    case ESP_GATTS_MTU_EVT://   设置mtu完成完成事件
        ESP_LOGI(TAG, "ESP_GATTS_MTU_EVT, MTU %d", param->mtu.mtu);
        break;
    case ESP_GATTS_UNREG_EVT:
        break;
    case ESP_GATTS_CREATE_EVT:// 创建服务完成事件
        ESP_LOGI(TAG, "CREATE_SERVICE_EVT, status %d,  service_handle %d\n", param->create.status, param->create.service_handle);
        gl_profile_tab[PROFILE_A_APP_ID].service_handle = param->create.service_handle;
        gl_profile_tab[PROFILE_A_APP_ID].char_uuid.len = ESP_UUID_LEN_16;
        gl_profile_tab[PROFILE_A_APP_ID].char_uuid.uuid.uuid16 = GATTS_CHAR_UUID_TEST_A;

        esp_ble_gatts_start_service(gl_profile_tab[PROFILE_A_APP_ID].service_handle);
        a_property = ESP_GATT_CHAR_PROP_BIT_READ | ESP_GATT_CHAR_PROP_BIT_WRITE | ESP_GATT_CHAR_PROP_BIT_NOTIFY;
        esp_err_t add_char_ret = esp_ble_gatts_add_char(gl_profile_tab[PROFILE_A_APP_ID].service_handle, &gl_profile_tab[PROFILE_A_APP_ID].char_uuid,
                                                        ESP_GATT_PERM_READ | ESP_GATT_PERM_WRITE,
                                                        a_property,
                                                        &gatts_demo_char1_val, NULL);
        if (add_char_ret){
            ESP_LOGE(TAG, "add char failed, error code =%x",add_char_ret);
        }
        break;
    case ESP_GATTS_ADD_INCL_SRVC_EVT:
        break;
    case ESP_GATTS_ADD_CHAR_EVT: {
        uint16_t length = 0;
        const uint8_t *prf_char;

        ESP_LOGI(TAG, "ADD_CHAR_EVT, status %d,  attr_handle %d, service_handle %d\n",
                param->add_char.status, param->add_char.attr_handle, param->add_char.service_handle);
        gl_profile_tab[PROFILE_A_APP_ID].char_handle = param->add_char.attr_handle;
        gl_profile_tab[PROFILE_A_APP_ID].descr_uuid.len = ESP_UUID_LEN_16;
        gl_profile_tab[PROFILE_A_APP_ID].descr_uuid.uuid.uuid16 = ESP_GATT_UUID_CHAR_CLIENT_CONFIG;
        esp_err_t get_attr_ret = esp_ble_gatts_get_attr_value(param->add_char.attr_handle,  &length, &prf_char);
        if (get_attr_ret == ESP_FAIL){
            ESP_LOGE(TAG, "ILLEGAL HANDLE");
        }

        ESP_LOGI(TAG, "the gatts demo char length = %x\n", length);
        for(int i = 0; i < length; i++){
            ESP_LOGI(TAG, "prf_char[%x] =%x\n",i,prf_char[i]);
        }
        esp_err_t add_descr_ret = esp_ble_gatts_add_char_descr(gl_profile_tab[PROFILE_A_APP_ID].service_handle, &gl_profile_tab[PROFILE_A_APP_ID].descr_uuid,
                                                                ESP_GATT_PERM_READ | ESP_GATT_PERM_WRITE, NULL, NULL);
        if (add_descr_ret){
            ESP_LOGE(TAG, "add char descr failed, error code =%x", add_descr_ret);
        }
        break;
    }
    case ESP_GATTS_ADD_CHAR_DESCR_EVT:
        gl_profile_tab[PROFILE_A_APP_ID].descr_handle = param->add_char_descr.attr_handle;
        ESP_LOGI(TAG, "ADD_DESCR_EVT, status %d, attr_handle %d, service_handle %d\n",
                param->add_char_descr.status, param->add_char_descr.attr_handle, param->add_char_descr.service_handle);
        break;
    case ESP_GATTS_DELETE_EVT:
        break;
    case ESP_GATTS_START_EVT:
        ESP_LOGI(TAG, "SERVICE_START_EVT, status %d, service_handle %d\n",
                param->start.status, param->start.service_handle);
        break;
    case ESP_GATTS_STOP_EVT:
        break;
        // 客户端连接事件
    case ESP_GATTS_CONNECT_EVT: {
        esp_ble_conn_update_params_t conn_params = {0};
        memcpy(conn_params.bda, param->connect.remote_bda, sizeof(esp_bd_addr_t));
        /* For the IOS system, please reference the apple official documents about the ble connection parameters restrictions. */
        conn_params.latency = 0;
        conn_params.max_int = 0x20;    // max_int = 0x20*1.25ms = 40ms
        conn_params.min_int = 0x10;    // min_int = 0x10*1.25ms = 20ms
        conn_params.timeout = 400;    // timeout = 400*10ms = 4000ms
        ESP_LOGI(TAG, "ESP_GATTS_CONNECT_EVT, conn_id %d, remote %02x:%02x:%02x:%02x:%02x:%02x:",
                param->connect.conn_id,
                param->connect.remote_bda[0], param->connect.remote_bda[1], param->connect.remote_bda[2],
                param->connect.remote_bda[3], param->connect.remote_bda[4], param->connect.remote_bda[5]);
        gl_profile_tab[PROFILE_A_APP_ID].conn_id = param->connect.conn_id;
        // 更新连接参数
        esp_ble_gap_update_conn_params(&conn_params);
        Current_gatts_if = gatts_if;
        Current_conn_id = param->connect.conn_id;
        BluetoothConnStatus = true;

        break;
    }
    case ESP_GATTS_DISCONNECT_EVT:
        ESP_LOGI(TAG, "ESP_GATTS_DISCONNECT_EVT, disconnect reason 0x%x", param->disconnect.reason);

        esp_ble_gap_start_advertising(&adv_params);
        BluetoothConnStatus = false;

        break;
    case ESP_GATTS_CONF_EVT:
        ESP_LOGI(TAG, "ESP_GATTS_CONF_EVT, status %d attr_handle %d", param->conf.status, param->conf.handle);
        if (param->conf.status != ESP_GATT_OK){
            esp_log_buffer_hex(TAG, param->conf.value, param->conf.len);
        }
        break;
    case ESP_GATTS_OPEN_EVT:
    case ESP_GATTS_CANCEL_OPEN_EVT:
    case ESP_GATTS_CLOSE_EVT:
    case ESP_GATTS_LISTEN_EVT:
    case ESP_GATTS_CONGEST_EVT:
    default:
        break;
    }
}

static void gatts_profile_b_event_handler(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param) {
    switch (event) {
    case ESP_GATTS_REG_EVT:
        ESP_LOGI(TAG, "REGISTER_APP_EVT, status %d, app_id %d\n", param->reg.status, param->reg.app_id);
        gl_profile_tab[PROFILE_B_APP_ID].service_id.is_primary = true;
        gl_profile_tab[PROFILE_B_APP_ID].service_id.id.inst_id = 0x00;
        gl_profile_tab[PROFILE_B_APP_ID].service_id.id.uuid.len = ESP_UUID_LEN_16;
        gl_profile_tab[PROFILE_B_APP_ID].service_id.id.uuid.uuid.uuid16 = GATTS_SERVICE_UUID_TEST_B;

        esp_ble_gatts_create_service(gatts_if, &gl_profile_tab[PROFILE_B_APP_ID].service_id, GATTS_NUM_HANDLE_TEST_B);
        break;
    case ESP_GATTS_READ_EVT: {
        ESP_LOGI(TAG, "GATT_READ_EVT, conn_id %d, trans_id %ld, handle %d\n", param->read.conn_id, param->read.trans_id, param->read.handle);
        esp_gatt_rsp_t rsp;
        memset(&rsp, 0, sizeof(esp_gatt_rsp_t));
        rsp.attr_value.handle = param->read.handle;
        rsp.attr_value.len = 4;
        rsp.attr_value.value[0] = 0xde;
        rsp.attr_value.value[1] = 0xed;
        rsp.attr_value.value[2] = 0xbe;
        rsp.attr_value.value[3] = 0xef;
        esp_ble_gatts_send_response(gatts_if, param->read.conn_id, param->read.trans_id,
                                    ESP_GATT_OK, &rsp);
        break;
    }
    case ESP_GATTS_WRITE_EVT: {
        ESP_LOGI(TAG, "GATT_WRITE_EVT, conn_id %d, trans_id %ld, handle %d\n", param->write.conn_id, param->write.trans_id, param->write.handle);
        if (!param->write.is_prep){
            //ESP_LOGI(TAG, "GATT_WRITE_EVT, value len %d, value :", param->write.len);
            if(param->write.len>0){
                memset(RevMsg,0,sizeof(RevMsg));
                memcpy(RevMsg,param->write.value,param->write.len);
                //ESP_LOGI(TAG, "GATT_WRITE_EVT, %d %d, \n", RevMsg[0],RevMsg[1]);
                ESP_LOGI(TAG, "GATT_WRITE_EVT, value len %d, value :%s\n", param->write.len,RevMsg);
            }
            esp_log_buffer_hex(TAG, param->write.value, param->write.len);
            if (gl_profile_tab[PROFILE_B_APP_ID].descr_handle == param->write.handle && param->write.len == 2){
                uint16_t descr_value= param->write.value[1]<<8 | param->write.value[0];
                if (descr_value == 0x0001){
                    if (b_property & ESP_GATT_CHAR_PROP_BIT_NOTIFY){
                        ESP_LOGI(TAG, "notify enable");
                        uint8_t notify_data[15];
                        for (int i = 0; i < sizeof(notify_data); ++i)
                        {
                            notify_data[i] = i%0xff;
                        }
                        //the size of notify_data[] need less than MTU size
                        esp_ble_gatts_send_indicate(gatts_if, param->write.conn_id, gl_profile_tab[PROFILE_B_APP_ID].char_handle,
                                                sizeof(notify_data), notify_data, false);
                    }
                }else if (descr_value == 0x0002){
                    if (b_property & ESP_GATT_CHAR_PROP_BIT_INDICATE){
                        ESP_LOGI(TAG, "indicate enable");
                        uint8_t indicate_data[15];
                        for (int i = 0; i < sizeof(indicate_data); ++i)
                        {
                            indicate_data[i] = i%0xff;
                        }
                        //the size of indicate_data[] need less than MTU size
                        esp_ble_gatts_send_indicate(gatts_if, param->write.conn_id, gl_profile_tab[PROFILE_B_APP_ID].char_handle,
                                                sizeof(indicate_data), indicate_data, true);
                    }
                }
                else if (descr_value == 0x0000){
                    ESP_LOGI(TAG, "notify/indicate disable ");
                }else{
                    ESP_LOGE(TAG, "unknown value");
                }

            }
        }
        example_write_event_env(gatts_if, &b_prepare_write_env, param);
        break;
    }
    case ESP_GATTS_EXEC_WRITE_EVT:
        ESP_LOGI(TAG,"ESP_GATTS_EXEC_WRITE_EVT");
        esp_ble_gatts_send_response(gatts_if, param->write.conn_id, param->write.trans_id, ESP_GATT_OK, NULL);
        example_exec_write_event_env(&b_prepare_write_env, param);
        break;
    case ESP_GATTS_MTU_EVT:
        ESP_LOGI(TAG, "ESP_GATTS_MTU_EVT, MTU %d", param->mtu.mtu);
        break;
    case ESP_GATTS_UNREG_EVT:
        break;
    case ESP_GATTS_CREATE_EVT:
        ESP_LOGI(TAG, "CREATE_SERVICE_EVT, status %d,  service_handle %d\n", param->create.status, param->create.service_handle);
        gl_profile_tab[PROFILE_B_APP_ID].service_handle = param->create.service_handle;
        gl_profile_tab[PROFILE_B_APP_ID].char_uuid.len = ESP_UUID_LEN_16;
        gl_profile_tab[PROFILE_B_APP_ID].char_uuid.uuid.uuid16 = GATTS_CHAR_UUID_TEST_B;

        esp_ble_gatts_start_service(gl_profile_tab[PROFILE_B_APP_ID].service_handle);
        b_property = ESP_GATT_CHAR_PROP_BIT_READ | ESP_GATT_CHAR_PROP_BIT_WRITE | ESP_GATT_CHAR_PROP_BIT_NOTIFY;
        esp_err_t add_char_ret =esp_ble_gatts_add_char( gl_profile_tab[PROFILE_B_APP_ID].service_handle, &gl_profile_tab[PROFILE_B_APP_ID].char_uuid,
                                                        ESP_GATT_PERM_READ | ESP_GATT_PERM_WRITE,
                                                        b_property,
                                                        NULL, NULL);
        if (add_char_ret){
            ESP_LOGE(TAG, "add char failed, error code =%x",add_char_ret);
        }
        break;
    case ESP_GATTS_ADD_INCL_SRVC_EVT:
        break;
    case ESP_GATTS_ADD_CHAR_EVT:
        ESP_LOGI(TAG, "ADD_CHAR_EVT, status %d,  attr_handle %d, service_handle %d\n",
                param->add_char.status, param->add_char.attr_handle, param->add_char.service_handle);

        gl_profile_tab[PROFILE_B_APP_ID].char_handle = param->add_char.attr_handle;
        gl_profile_tab[PROFILE_B_APP_ID].descr_uuid.len = ESP_UUID_LEN_16;
        gl_profile_tab[PROFILE_B_APP_ID].descr_uuid.uuid.uuid16 = ESP_GATT_UUID_CHAR_CLIENT_CONFIG;
        esp_ble_gatts_add_char_descr(gl_profile_tab[PROFILE_B_APP_ID].service_handle, &gl_profile_tab[PROFILE_B_APP_ID].descr_uuid,
                                    ESP_GATT_PERM_READ | ESP_GATT_PERM_WRITE,
                                    NULL, NULL);
        break;
    case ESP_GATTS_ADD_CHAR_DESCR_EVT:
        gl_profile_tab[PROFILE_B_APP_ID].descr_handle = param->add_char_descr.attr_handle;
        ESP_LOGI(TAG, "ADD_DESCR_EVT, status %d, attr_handle %d, service_handle %d\n",
                param->add_char_descr.status, param->add_char_descr.attr_handle, param->add_char_descr.service_handle);
        break;
    case ESP_GATTS_DELETE_EVT:
        break;
    case ESP_GATTS_START_EVT:
        ESP_LOGI(TAG, "SERVICE_START_EVT, status %d, service_handle %d\n",
                param->start.status, param->start.service_handle);
        break;
    case ESP_GATTS_STOP_EVT:
        break;
    case ESP_GATTS_CONNECT_EVT:
        ESP_LOGI(TAG, "CONNECT_EVT, conn_id %d, remote %02x:%02x:%02x:%02x:%02x:%02x:",
                param->connect.conn_id,
                param->connect.remote_bda[0], param->connect.remote_bda[1], param->connect.remote_bda[2],
                param->connect.remote_bda[3], param->connect.remote_bda[4], param->connect.remote_bda[5]);
        gl_profile_tab[PROFILE_B_APP_ID].conn_id = param->connect.conn_id;
        break;
    case ESP_GATTS_CONF_EVT:
        ESP_LOGI(TAG, "ESP_GATTS_CONF_EVT status %d attr_handle %d", param->conf.status, param->conf.handle);
        if (param->conf.status != ESP_GATT_OK){
            esp_log_buffer_hex(TAG, param->conf.value, param->conf.len);
        }
    break;
    case ESP_GATTS_DISCONNECT_EVT:
    case ESP_GATTS_OPEN_EVT:
    case ESP_GATTS_CANCEL_OPEN_EVT:
    case ESP_GATTS_CLOSE_EVT:
    case ESP_GATTS_LISTEN_EVT:
    case ESP_GATTS_CONGEST_EVT:
    default:
        break;
    }
}

static void gatts_event_handler(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param)
{
    /* If event is register event, store the gatts_if for each profile */
    if (event == ESP_GATTS_REG_EVT) {
        if (param->reg.status == ESP_GATT_OK) {
            gl_profile_tab[param->reg.app_id].gatts_if = gatts_if;
        } else {
            ESP_LOGI(TAG, "Reg app failed, app_id %04x, status %d\n",
                    param->reg.app_id,
                    param->reg.status);
            return;
        }
    }

    /* If the gatts_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 (gatts_if == ESP_GATT_IF_NONE || /* ESP_GATT_IF_NONE, not specify a certain gatt_if, need to call every profile cb function */
                    gatts_if == gl_profile_tab[idx].gatts_if) {
                if (gl_profile_tab[idx].gatts_cb) {
                    gl_profile_tab[idx].gatts_cb(event, gatts_if, param);
                }
            }
        }
    } while (0);
}
// 读取按钮状态
uint8_t ReadKeyStatus(void)
{
    if(gpio_get_level(0)){
        return 0;
    }
    return 1;
}
void app_main()
{
    char *BTMAC[16];

    uint8_t MAC[6];
    // 打印库版本信息
    ESP_LOGI(TAG, "[APP] Start!~\r\n");
    ESP_LOGI(TAG, "[APP] IDF Version is %d.%d.%d",ESP_IDF_VERSION_MAJOR,ESP_IDF_VERSION_MINOR,ESP_IDF_VERSION_PATCH);
    ESP_LOGI(TAG, "[APP] IDF version: %s", esp_get_idf_version());
    // 打印芯片信息
    esp_chip_info_t chip_info;
    esp_chip_info(&chip_info);
    ESP_LOGI(TAG, "ESP32 Chip Cores Count:  %d",chip_info.cores);
    if(chip_info.model == 1){
        ESP_LOGI(TAG, "ESP32 Chip Model is:  ESP32");
    }else if(chip_info.model == 2){
        ESP_LOGI(TAG, "ESP32 Chip Model is:  ESP32S2");
    }else{
        ESP_LOGI(TAG, "ESP32 Chip Model is:  Unknown Model");
    }
    ESP_LOGI(TAG, "ESP32 Chip Features is:  %lu",chip_info.features);
    ESP_LOGI(TAG, "ESP32 Chip Revision is:  %d",chip_info.revision);

    ESP_LOGI(TAG, "ESP32 Chip, WiFi%s%s, ",
            (chip_info.features & CHIP_FEATURE_BT) ? "/BT" : "",
            (chip_info.features & CHIP_FEATURE_BLE) ? "/BLE" : "");

    uint32_t size_flash_chip;
    esp_flash_get_size(NULL, &size_flash_chip);

    ESP_LOGI(TAG, "SPI Flash Chip Size: %lu MByte %s Flash", size_flash_chip / (1024 * 1024),
            (chip_info.features & CHIP_FEATURE_EMB_FLASH) ? "Embedded" : "External");

    ESP_LOGI(TAG, "Free Heap Size is:  %ld Byte",esp_get_free_heap_size());
    ESP_LOGI(TAG, "Free Internal Heap Size is:  %ld Byte",esp_get_free_internal_heap_size());
    ESP_LOGI(TAG, "Free minimum Heap Size is:  %ld Byte",esp_get_minimum_free_heap_size());

    efuse_hal_get_mac(MAC);
    ESP_LOGI(TAG, "MAC Address:");
    ESP_LOG_BUFFER_HEX(TAG, MAC,6);

    // 初始化flash
    esp_err_t ret = nvs_flash_init();
    if (ret == ESP_ERR_NVS_NO_FREE_PAGES){
        ESP_ERROR_CHECK(nvs_flash_erase());
        ret = nvs_flash_init();
    }
    ESP_ERROR_CHECK(ret);

    // 释放未使用的BT Classic内存。
    ESP_ERROR_CHECK(esp_bt_controller_mem_release(ESP_BT_MODE_CLASSIC_BT));

    esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
    // 初始化BT控制器以分配任务和其他资源。 在调用任何其他BT函数之前，仅应调用一次此函数。
    ret = esp_bt_controller_init(&bt_cfg);
    if (ret) {
        ESP_LOGE(TAG, "%s initialize controller failed: %s\n", __func__, esp_err_to_name(ret));
        return;
    }
    // 启用BT控制器。 esp_bt_controller_disable()
    ret = esp_bt_controller_enable(ESP_BT_MODE_BLE);
    if (ret) {
        ESP_LOGE(TAG, "%s enable controller failed: %s\n", __func__, esp_err_to_name(ret));
        return;
    }
    // 初始化并为蓝牙分配资源
    ret = esp_bluedroid_init();
    if (ret) {
        ESP_LOGE(TAG, "%s init bluetooth failed: %s\n", __func__, esp_err_to_name(ret));
        return;
    }
    // 启用蓝牙，必须在esp_bluedroid_init（）之后
    ret = esp_bluedroid_enable();
    if (ret) {
        ESP_LOGE(TAG, "%s enable bluetooth failed: %s\n", __func__, esp_err_to_name(ret));
        return;
    }
        // 注册BTA GATTS模块的事件回调函数
    ret = esp_ble_gatts_register_callback(gatts_event_handler);
    if (ret){
        ESP_LOGE(TAG, "gatts register error, error code = %x", ret);
        return;
    }
    // 注册GAP事件回调函数，例如扫描结果
    ret = esp_ble_gap_register_callback(gap_event_handler);
    if (ret){
        ESP_LOGE(TAG, "gap register error, error code = %x", ret);
        return;
    }
    // 注册应用程序标识符
    ret = esp_ble_gatts_app_register(PROFILE_A_APP_ID);
    if (ret){
        ESP_LOGE(TAG, "gatts app register error, error code = %x", ret);
        return;
    }
    // 注册应用程序标识符
    ret = esp_ble_gatts_app_register(PROFILE_B_APP_ID);
    if (ret){
        ESP_LOGE(TAG, "gatts app register error, error code = %x", ret);
        return;
    }
    // 配置本地MTU大小
    esp_err_t local_mtu_ret = esp_ble_gatt_set_local_mtu(100);
    if (local_mtu_ret){
        ESP_LOGE(TAG, "set local  MTU failed, error code = %x", local_mtu_ret);
    }
    const uint8_t *addr = esp_bt_dev_get_address();
    ESP_LOGI(TAG, "BT MAC Addr :  %02X.%02X.%02X.%02X.%02X.%02X",addr[0],addr[1],addr[2],addr[3],addr[4],addr[5]);

    //WS2812B_init();       // WS2812B初始化
//  KeyInit();          // 按键GPIO初始化
    //xTaskCreate(&ADXL345_Task,"ADXL345_Task",4096,NULL,4,NULL);
    //配置GPIO结构体
    gpio_config_t io_conf;
    io_conf.intr_type = GPIO_INTR_DISABLE;      // 禁用中断
    io_conf.pin_bit_mask = 1 << 0;              // 设置GPIO号
    io_conf.mode = GPIO_MODE_INPUT;                     // 模式输入
    io_conf.pull_up_en = GPIO_PULLUP_ENABLE;    // 端口上拉使能
    gpio_config(&io_conf);

    while (1)
    {
        // 读取按钮状态
        if(ReadKeyStatus()){
            if(BluetoothConnStatus){
                memset(BLEReadDataBuff,0,sizeof(BLEReadDataBuff));
                memcpy(BLEReadDataBuff,"HelloBug i am ESP32",sizeof("HelloBug i am ESP32"));
                esp_ble_gatts_send_indicate(Current_gatts_if, Current_conn_id, gl_profile_tab[PROFILE_B_APP_ID].char_handle,
                                                sizeof(BLEReadDataBuff), BLEReadDataBuff, false);
                ESP_LOGI(TAG, "ReadKeyStatus down");
                vTaskDelay(300 / portTICK_PERIOD_MS);

            }
        }
        vTaskDelay(10 / portTICK_PERIOD_MS);
    }
    return;
}

显示蓝牙连接的秘钥：