OVMS3-idf/examples/bluetooth/a2dp_gatts_coex/main/main.c

/*
   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/

/****************************************************************************
* The demo shows BLE and classic Bluetooth coexistence. You can use BLE GATT server and classic bluetooth A2DP together.
* The BLE GATT server part of the demo creates a GATT service and then starts advertising, waiting to be connected by a GATT client.
* After the program is started, a GATT client can discover the device named "ESP_COEX_BLE_DEMO". Once the connection is established,
* GATT client can read or write data to the device. It can also receive notification or indication data.
* Attention: If you test the demo with iPhone, BLE GATT server adv name will change to "ESP_COEX_A2DP_DEMO" after you connect it.
* The classic bluetooth A2DP part of the demo implements Advanced Audio Distribution Profile to receive an audio stream.
* After the program is started, other bluetooth devices such as smart phones can discover the device named "ESP_COEX_A2DP_DEMO".
* Once the connection is established, audio data can be transmitted. This will be visible in the application log including a count
* of audio data packets.
****************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "nvs.h"
#include "nvs_flash.h"
#include "esp_system.h"
#include "esp_log.h"

#include "esp_bt.h"
#include "bt_app_core.h"
#include "bt_app_av.h"
#include "esp_bt_main.h"
#include "esp_bt_device.h"
#include "esp_gap_bt_api.h"
#include "esp_a2dp_api.h"
#include "esp_avrc_api.h"
#include "driver/i2s.h"

#include "esp_gap_ble_api.h"
#include "esp_gatts_api.h"
#include "esp_bt_defs.h"
#include "esp_gatt_common_api.h"

#define BT_BLE_COEX_TAG             "BT_BLE_COEX"
#define BT_DEVICE_NAME              "ESP_COEX_A2DP_DEMO"
#define BLE_ADV_NAME                "ESP_COEX_BLE_DEMO"

#define GATTS_SERVICE_UUID_A        0x00FF
#define GATTS_CHAR_UUID_A           0xFF01
#define GATTS_DESCR_UUID_A          0x3333
#define GATTS_NUM_HANDLE_A          4

#define GATTS_SERVICE_UUID_B        0x00EE
#define GATTS_CHAR_UUID_B           0xEE01
#define GATTS_DESCR_UUID_B          0x2222
#define GATTS_NUM_HANDLE_B          4

#define GATTS_DEMO_CHAR_VAL_LEN_MAX 0x40
#define PREPARE_BUF_MAX_SIZE        1024
#define PROFILE_NUM                 2
#define PROFILE_A_APP_ID            0
#define PROFILE_B_APP_ID            1

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;

//Declare the static function
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);
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);

/* event for handler "bt_av_hdl_stack_up */
enum {
    BT_APP_EVT_STACK_UP = 0,
};
static uint8_t ble_char_value_str[] = {0x11, 0x22, 0x33};
esp_gatt_char_prop_t a_property = 0;
esp_gatt_char_prop_t b_property = 0;

esp_attr_value_t gatts_initial_char_val = {
    .attr_max_len = GATTS_DEMO_CHAR_VAL_LEN_MAX,
    .attr_len     = sizeof(ble_char_value_str),
    .attr_value   = ble_char_value_str,
};

static esp_ble_adv_params_t adv_params = {
    .adv_int_min        = 0x060,
    .adv_int_max        = 0x060,
    .adv_type           = ADV_TYPE_IND,
    .own_addr_type      = BLE_ADDR_TYPE_RANDOM,
    .channel_map        = ADV_CHNL_ALL,
    .adv_filter_policy = ADV_FILTER_ALLOW_SCAN_ANY_CON_ANY,
};

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 */
    },
};
static void ble_init_adv_data(const char *name)
{
    int len = strlen(name);
    uint8_t raw_adv_data[len+5];
    //flag
    raw_adv_data[0] = 2;
    raw_adv_data[1] = ESP_BT_EIR_TYPE_FLAGS;
    raw_adv_data[2] = (ESP_BLE_ADV_FLAG_GEN_DISC | ESP_BLE_ADV_FLAG_BREDR_NOT_SPT);
    //adv name
    raw_adv_data[3] = len + 1;
    raw_adv_data[4] = ESP_BLE_AD_TYPE_NAME_CMPL;
    for (int i = 0;i < len;i++)
    {
        raw_adv_data[i+5] = *(name++);
    }
    //The length of adv data must be less than 31 bytes
    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(BT_BLE_COEX_TAG, "config raw adv data failed, error code = 0x%x ", raw_adv_ret);
    }
    esp_err_t raw_scan_ret = esp_ble_gap_config_scan_rsp_data_raw(raw_adv_data, sizeof(raw_adv_data));
    if (raw_scan_ret){
        ESP_LOGE(BT_BLE_COEX_TAG, "config raw scan rsp data failed, error code = 0x%x", raw_scan_ret);
    }
}

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_RAW_SET_COMPLETE_EVT:
        //esp_ble_gap_start_advertising(&adv_params);
        break;
    case ESP_GAP_BLE_SCAN_RSP_DATA_RAW_SET_COMPLETE_EVT:
        esp_ble_gap_start_advertising(&adv_params);
        break;
    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(BT_BLE_COEX_TAG, "Advertising start failed\n");
        }else {
            ESP_LOGI(BT_BLE_COEX_TAG, "Start adv successfully\n");
        }
        break;
    case ESP_GAP_BLE_ADV_STOP_COMPLETE_EVT:
        if (param->adv_stop_cmpl.status != ESP_BT_STATUS_SUCCESS) {
            ESP_LOGE(BT_BLE_COEX_TAG, "Advertising stop failed\n");
        }
        else {
            ESP_LOGI(BT_BLE_COEX_TAG, "Stop adv successfully\n");
        }
        break;
    case ESP_GAP_BLE_UPDATE_CONN_PARAMS_EVT:
         ESP_LOGI(BT_BLE_COEX_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(BT_BLE_COEX_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(BT_BLE_COEX_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(BT_BLE_COEX_TAG, prepare_write_env->prepare_buf, prepare_write_env->prepare_len);
    }else{
        ESP_LOGI(BT_BLE_COEX_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(BT_BLE_COEX_TAG, "REGISTER_APP_EVT, status %d, app_id %d\n", param->reg.status, param->reg.app_id);
        esp_ble_gap_config_local_privacy(true);
        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_A;
        //init BLE adv data and scan response data
        ble_init_adv_data(BLE_ADV_NAME);
        esp_ble_gatts_create_service(gatts_if, &gl_profile_tab[PROFILE_A_APP_ID].service_id, GATTS_NUM_HANDLE_A);
        break;
    case ESP_GATTS_READ_EVT: {
        ESP_LOGI(BT_BLE_COEX_TAG, "GATT_READ_EVT, conn_id %d, trans_id %d, 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(BT_BLE_COEX_TAG, "GATT_WRITE_EVT, conn_id %d, trans_id %d, handle %d", param->write.conn_id, param->write.trans_id, param->write.handle);
        if (!param->write.is_prep){
            ESP_LOGI(BT_BLE_COEX_TAG, "GATT_WRITE_EVT, value len %d, value :", param->write.len);
            esp_log_buffer_hex(BT_BLE_COEX_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(BT_BLE_COEX_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(BT_BLE_COEX_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(BT_BLE_COEX_TAG, "notify/indicate disable ");
                }else{
                    ESP_LOGE(BT_BLE_COEX_TAG, "unknown descr value");
                    esp_log_buffer_hex(BT_BLE_COEX_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(BT_BLE_COEX_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:
        ESP_LOGI(BT_BLE_COEX_TAG, "ESP_GATTS_MTU_EVT, MTU %d", param->mtu.mtu);
        break;
    case ESP_GATTS_UNREG_EVT:
        break;
    case ESP_GATTS_CREATE_EVT:
        ESP_LOGI(BT_BLE_COEX_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_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_initial_char_val, NULL);
        if (add_char_ret){
            ESP_LOGE(BT_BLE_COEX_TAG, "add char failed, error code = 0x%x",add_char_ret);
        }
        break;
    case ESP_GATTS_ADD_INCL_SRVC_EVT:
        break;
    case ESP_GATTS_ADD_CHAR_EVT: {
        ESP_LOGI(BT_BLE_COEX_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 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(BT_BLE_COEX_TAG, "add char descr failed, error code = 0x%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(BT_BLE_COEX_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(BT_BLE_COEX_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_ble_conn_update_params_t conn_params = {0};
        memcpy(conn_params.bda, param->connect.remote_bda, sizeof(esp_bd_addr_t));
        break;
    }
    case ESP_GATTS_DISCONNECT_EVT:
        ESP_LOGI(BT_BLE_COEX_TAG, "ESP_GATTS_DISCONNECT_EVT");
        esp_ble_gap_start_advertising(&adv_params);
        break;
    case ESP_GATTS_CONF_EVT:
        ESP_LOGI(BT_BLE_COEX_TAG, "ESP_GATTS_CONF_EVT, status %d", param->conf.status);
        if (param->conf.status != ESP_GATT_OK){
            esp_log_buffer_hex(BT_BLE_COEX_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(BT_BLE_COEX_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_B;

        esp_ble_gatts_create_service(gatts_if, &gl_profile_tab[PROFILE_B_APP_ID].service_id, GATTS_NUM_HANDLE_B);
        break;
    case ESP_GATTS_READ_EVT: {
        ESP_LOGI(BT_BLE_COEX_TAG, "GATT_READ_EVT, conn_id %d, trans_id %d, 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(BT_BLE_COEX_TAG, "GATT_WRITE_EVT, conn_id %d, trans_id %d, handle %d\n", param->write.conn_id, param->write.trans_id, param->write.handle);
        if (!param->write.is_prep){
            ESP_LOGI(BT_BLE_COEX_TAG, "GATT_WRITE_EVT, value len %d, value :", param->write.len);
            esp_log_buffer_hex(BT_BLE_COEX_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(BT_BLE_COEX_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(BT_BLE_COEX_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(BT_BLE_COEX_TAG, "notify/indicate disable ");
                }else{
                    ESP_LOGE(BT_BLE_COEX_TAG, "unknown value");
                }

            }
        }
        example_write_event_env(gatts_if, &b_prepare_write_env, param);
        break;
    }
    case ESP_GATTS_EXEC_WRITE_EVT:
        ESP_LOGI(BT_BLE_COEX_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(BT_BLE_COEX_TAG, "ESP_GATTS_MTU_EVT, MTU %d", param->mtu.mtu);
        break;
    case ESP_GATTS_UNREG_EVT:
        break;
    case ESP_GATTS_CREATE_EVT:
        ESP_LOGI(BT_BLE_COEX_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_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(BT_BLE_COEX_TAG, "add char failed, error code = 0x%x",add_char_ret);
        }
        break;
    case ESP_GATTS_ADD_INCL_SRVC_EVT:
        break;
    case ESP_GATTS_ADD_CHAR_EVT:
        ESP_LOGI(BT_BLE_COEX_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(BT_BLE_COEX_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(BT_BLE_COEX_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(BT_BLE_COEX_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(BT_BLE_COEX_TAG, "ESP_GATTS_CONF_EVT status %d", param->conf.status);
        if (param->conf.status != ESP_GATT_OK){
            esp_log_buffer_hex(BT_BLE_COEX_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(BT_BLE_COEX_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);
}

static void ble_gatts_init(void)
{
    esp_err_t ret = esp_ble_gatts_register_callback(gatts_event_handler);
    if (ret){
        ESP_LOGE(BT_BLE_COEX_TAG, "gatts register error, error code = 0x%x", ret);
        return;
    }
    ret = esp_ble_gap_register_callback(gap_event_handler);
    if (ret){
        ESP_LOGE(BT_BLE_COEX_TAG, "gap register error, error code = 0x%x", ret);
        return;
    }
    ret = esp_ble_gatts_app_register(PROFILE_A_APP_ID);
    if (ret){
        ESP_LOGE(BT_BLE_COEX_TAG, "gatts app register error, error code = 0x%x", ret);
        return;
    }
    ret = esp_ble_gatts_app_register(PROFILE_B_APP_ID);
    if (ret){
        ESP_LOGE(BT_BLE_COEX_TAG, "gatts app register error, error code = 0x%x", ret);
        return;
    }
    esp_err_t local_mtu_ret = esp_ble_gatt_set_local_mtu(500);
    if (local_mtu_ret){
        ESP_LOGE(BT_BLE_COEX_TAG, "set local  MTU failed, error code = 0x%x", local_mtu_ret);
    }
}

void bt_app_gap_cb(esp_bt_gap_cb_event_t event, esp_bt_gap_cb_param_t *param)
{
    switch (event) {
    case ESP_BT_GAP_AUTH_CMPL_EVT: {
        if (param->auth_cmpl.stat == ESP_BT_STATUS_SUCCESS) {
            ESP_LOGI(BT_BLE_COEX_TAG, "authentication success: %s", param->auth_cmpl.device_name);
            esp_log_buffer_hex(BT_BLE_COEX_TAG, param->auth_cmpl.bda, ESP_BD_ADDR_LEN);
        } else {
            ESP_LOGE(BT_BLE_COEX_TAG, "authentication failed, status:%d", param->auth_cmpl.stat);
        }
        break;
    }
#if (CONFIG_BT_SSP_ENABLED == true)
    case ESP_BT_GAP_CFM_REQ_EVT:
        ESP_LOGI(BT_BLE_COEX_TAG, "ESP_BT_GAP_CFM_REQ_EVT Please compare the numeric value: %d", param->cfm_req.num_val);
        esp_bt_gap_ssp_confirm_reply(param->cfm_req.bda, true);
        break;
    case ESP_BT_GAP_KEY_NOTIF_EVT:
        ESP_LOGI(BT_BLE_COEX_TAG, "ESP_BT_GAP_KEY_NOTIF_EVT passkey:%d", param->key_notif.passkey);
        break;
    case ESP_BT_GAP_KEY_REQ_EVT:
        ESP_LOGI(BT_BLE_COEX_TAG, "ESP_BT_GAP_KEY_REQ_EVT Please enter passkey!");
        break;
#endif
    default: {
        ESP_LOGI(BT_BLE_COEX_TAG, "event: %d", event);
        break;
    }
    }
    return;
}

/* handler for bluetooth stack enabled events */
static void bt_av_hdl_stack_evt(uint16_t event, void *p_param)
{
    ESP_LOGD(BT_BLE_COEX_TAG, "%s evt %d", __func__, event);
    switch (event) {
    case BT_APP_EVT_STACK_UP: {
        /* set up bt device name */
        esp_bt_dev_set_device_name(BT_DEVICE_NAME);

        esp_bt_gap_register_callback(bt_app_gap_cb);

        /* initialize AVRCP controller */
        esp_avrc_ct_init();
        esp_avrc_ct_register_callback(bt_app_rc_ct_cb);
        /* initialize AVRCP target */
        assert (esp_avrc_tg_init() == ESP_OK);
        esp_avrc_tg_register_callback(bt_app_rc_tg_cb);

        esp_avrc_rn_evt_cap_mask_t evt_set = {0};
        esp_avrc_rn_evt_bit_mask_operation(ESP_AVRC_BIT_MASK_OP_SET, &evt_set, ESP_AVRC_RN_VOLUME_CHANGE);
        assert(esp_avrc_tg_set_rn_evt_cap(&evt_set) == ESP_OK);

        /* initialize A2DP sink */
        esp_a2d_register_callback(&bt_app_a2d_cb);
        esp_a2d_sink_register_data_callback(bt_app_a2d_data_cb);
        esp_a2d_sink_init();

        /* set discoverable and connectable mode, wait to be connected */
        esp_bt_gap_set_scan_mode(ESP_BT_CONNECTABLE, ESP_BT_GENERAL_DISCOVERABLE);
        break;
    }
    default:
        ESP_LOGE(BT_BLE_COEX_TAG, "%s unhandled evt %d", __func__, event);
        break;
    }
}

void app_main()
{
    /* Initialize NVS — it is used to store PHY calibration data */
    esp_err_t err = nvs_flash_init();
    if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
        ESP_ERROR_CHECK(nvs_flash_erase());
        err = nvs_flash_init();
    }
    ESP_ERROR_CHECK(err);

    i2s_config_t i2s_config = {
#ifdef CONFIG_EXAMPLE_A2DP_SINK_OUTPUT_INTERNAL_DAC
        .mode = I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN,
#else
        .mode = I2S_MODE_MASTER | I2S_MODE_TX,                                  // Only TX
#endif
        .sample_rate = 44100,
        .bits_per_sample = 16,
        .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,                           //2-channels
        .communication_format = I2S_COMM_FORMAT_I2S_MSB,
        .dma_buf_count = 6,
        .dma_buf_len = 60,
        .intr_alloc_flags = 0,                                                  //Default interrupt priority
        .tx_desc_auto_clear = true                                              //Auto clear tx descriptor on underflow
    };


    i2s_driver_install(0, &i2s_config, 0, NULL);
#ifdef CONFIG_EXAMPLE_A2DP_SINK_OUTPUT_INTERNAL_DAC
    i2s_set_dac_mode(I2S_DAC_CHANNEL_BOTH_EN);
    i2s_set_pin(0, NULL);
#else
    i2s_pin_config_t pin_config = {
        .bck_io_num = CONFIG_EXAMPLE_I2S_BCK_PIN,
        .ws_io_num = CONFIG_EXAMPLE_I2S_LRCK_PIN,
        .data_out_num = CONFIG_EXAMPLE_I2S_DATA_PIN,
        .data_in_num = -1                                                       //Not used
    };

    i2s_set_pin(0, &pin_config);
#endif

    esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
    if ((err = esp_bt_controller_init(&bt_cfg)) != ESP_OK) {
        ESP_LOGE(BT_BLE_COEX_TAG, "%s initialize controller failed: %s\n", __func__, esp_err_to_name(err));
        return;
    }

    if ((err = esp_bt_controller_enable(ESP_BT_MODE_BTDM)) != ESP_OK) {
        ESP_LOGE(BT_BLE_COEX_TAG, "%s enable controller failed: %s\n", __func__, esp_err_to_name(err));
        return;
    }

    if ((err = esp_bluedroid_init()) != ESP_OK) {
        ESP_LOGE(BT_BLE_COEX_TAG, "%s initialize bluedroid failed: %s\n", __func__, esp_err_to_name(err));
        return;
    }

    if ((err = esp_bluedroid_enable()) != ESP_OK) {
        ESP_LOGE(BT_BLE_COEX_TAG, "%s enable bluedroid failed: %s\n", __func__, esp_err_to_name(err));
        return;
    }

    /* create application task */
    bt_app_task_start_up();

    /* Bluetooth device name, connection mode and profile set up */
    bt_app_work_dispatch(bt_av_hdl_stack_evt, BT_APP_EVT_STACK_UP, NULL, 0, NULL);

#if (CONFIG_BT_SSP_ENABLED == true)
    /* Set default parameters for Secure Simple Pairing */
    esp_bt_sp_param_t param_type = ESP_BT_SP_IOCAP_MODE;
    esp_bt_io_cap_t iocap = ESP_BT_IO_CAP_IO;
    esp_bt_gap_set_security_param(param_type, &iocap, sizeof(uint8_t));
#endif

    /*
     * Set default parameters for Legacy Pairing
     * Use fixed pin code
     */
    esp_bt_pin_type_t pin_type = ESP_BT_PIN_TYPE_FIXED;
    esp_bt_pin_code_t pin_code;
    pin_code[0] = '1';
    pin_code[1] = '2';
    pin_code[2] = '3';
    pin_code[3] = '4';
    esp_bt_gap_set_pin(pin_type, 4, pin_code);

    //gatt server init
    ble_gatts_init();
}