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#include <Arduino.h>
#include "bt.h"
#include "btm_api.h"
#include "esp_gap_ble_api.h"
#include "esp_bt_main.h"

static bool connect = false;
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;
    switch (event) {
    case ESP_GAP_BLE_SCAN_PARAM_SET_COMPLETE_EVT: {
        //the unit of the duration is second
        uint32_t duration = 30;
        esp_ble_gap_start_scanning(duration);
        break;
    }
    case ESP_GAP_BLE_SCAN_START_COMPLETE_EVT:
        //scan start complete event to indicate scan start successfully or failed
        if (param->scan_start_cmpl.status != ESP_BT_STATUS_SUCCESS) {
            ESP_LOGE("GAP", "Scan start failed");
        }
        break;
    case ESP_GAP_BLE_SCAN_RESULT_EVT: {
        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:
            for (int i = 0; i < 6; i++) {
                ESP_LOGI("GAP", "%x:", scan_result->scan_rst.bda[i]);
            }
            ESP_LOGI("GAP", "Searched Adv Data Len %d, Scan Response Len %d\n", scan_result->scan_rst.adv_data_len, scan_result->scan_rst.scan_rsp_len);
            ESP_LOGI("GAP", "\n");
            adv_name = esp_ble_resolve_adv_data(scan_result->scan_rst.ble_adv,
                                                ESP_BLE_AD_TYPE_NAME_CMPL, &adv_name_len);
            ESP_LOGI("GAP", "Searched Device Name Len %d", adv_name_len);
            for (int j = 0; j < adv_name_len; j++) {
                ESP_LOGI("GAP", "%c", adv_name[j]);
            }

            break;
        case ESP_GAP_SEARCH_INQ_CMPL_EVT:
            break;
        default:
            break;
        }
        break;
    }

    case ESP_GAP_BLE_SCAN_STOP_COMPLETE_EVT:
        if (param->scan_stop_cmpl.status != ESP_BT_STATUS_SUCCESS){
            ESP_LOGE("GAP", "Scan stop failed");
        }
        else {
            ESP_LOGI("GAP", "Stop scan successfully");
        }
        break;

    case ESP_GAP_BLE_ADV_STOP_COMPLETE_EVT:
        if (param->adv_stop_cmpl.status != ESP_BT_STATUS_SUCCESS){
            ESP_LOGE("GAP", "Adv stop failed");
        }
        else {
            ESP_LOGI("GAP", "Stop adv successfully");
        }
        break;

    default:
        break;
    }
}

void setup()
{
    Serial.begin(115200);
    delay(5000);

    Serial.println("Starting BT");

    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();

    esp_err_t status;

    //register the scan callback function to the gap module
    if ((status = esp_ble_gap_register_callback(esp_gap_cb)) != ESP_OK) {
        ESP_LOGE("GAP", "gap register error, error code = %x", status);
        return;
    }

    //register the callback function to the gattc module
    /*if ((status = esp_ble_gattc_register_callback(esp_gattc_cb)) != ESP_OK) {
        ESP_LOGE(GATTC_TAG, "gattc register error, error code = %x", status);
        return;
    }*/
}

int value = 0;

void loop()
{
}

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Starting BT
BTDM CONTROLLER VERSION: 010101
btip start
copy .data from 4000d890 to 3ffae6e0, len 00001830
E (51371) BT: Conrollset .bss 0x0 from 3ffb8000 to 3ffbff70, len 00007f70
BTDM ROM VERSION 0101
BD_ADDR: 24:0A:C4:03:86:6A
NVDS MAGIC FAILED
RF Init OK with coex
er not initialised

E (51386) BT: Bludroid not initialised

E (51389) GAP: gap register error, error code = 103

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# Name,   Type, SubType, Offset,  Size, Flags
nvs,      data, nvs,     0x9000,  0x5000,
otadata,  data, ota,     0xe000,  0x2000,
app0,     app,  ota_0,   0x10000, 2M,
spiffs,   data, spiffs,  0x210000,0x1F0000,