编译官方gatt server 例子，将 wifi get started 例子挪过部分code，
报错 unknown type name 'esp_event_handler_instance_t'; did you mean 'esp_event_handler_t'，
引入如下：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h ...