text: /*
   * SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
   *
   * SPDX-License-Identifier: Unlicense OR CC0-1.0
   */
  
  #ifndef __BT_APP_CORE_H__
  #define __BT_APP_CORE_H__
  
  #include <stdint.h>
  #include <stdbool.h>
  #include <stdio.h>
  
  #define BT_APP_CORE_TAG                   "BT_APP_CORE"
  
  #define BT_APP_SIG_WORK_DISPATCH          (0x01)
  
  /**
   * @brief     handler for the dispatched work
   */
  typedef void (* bt_app_cb_t) (uint16_t event, void *param);
  
  /* message to be sent */
  typedef struct {
      uint16_t             sig;      /*!< signal to bt_app_task */
      uint16_t             event;    /*!< message event id */
      bt_app_cb_t          cb;       /*!< context switch callback */
      void                 *param;   /*!< parameter area needs to be the last */
  } bt_app_msg_t;
  
  /**
   * @brief     parameter deep-copy function to be customized
   */
  typedef void (* bt_app_copy_cb_t) (bt_app_msg_t *msg, void *p_dest, void *p_src);
  
  /**
   * @brief     work dispatcher for the application task
   */
  bool bt_app_work_dispatch(bt_app_cb_t p_cback, uint16_t event, void *p_params, int param_len, bt_app_copy_cb_t p_copy_cback);
  
  void bt_app_task_start_up(void);
  
  void bt_app_task_shut_down(void);
  
  #endif /* __BT_APP_CORE_H__ */
  