text: /**
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  /** @file
   *
   * @defgroup ble_lbs LED Button Service Server
   * @{
   * @ingroup ble_sdk_srv
   *
   * @brief LED Button Service Server module.
   *
   * @details This module implements a custom LED Button Service with an LED and Button Characteristics.
   *          During initialization, the module adds the LED Button Service and Characteristics
   *          to the BLE stack database.
   *
   *          The application must supply an event handler for receiving LED Button Service
   *          events. Using this handler, the service notifies the application when the
   *          LED value changes.
   *
   *          The service also provides a function for letting the application notify
   *          the state of the Button Characteristic to connected peers.
   *
   * @note    The application must register this module as BLE event observer using the
   *          NRF_SDH_BLE_OBSERVER macro. Example:
   *          @code
   *              ble_hids_t instance;
   *              NRF_SDH_BLE_OBSERVER(anything, BLE_HIDS_BLE_OBSERVER_PRIO,
   *                                   ble_hids_on_ble_evt, &instance);
   *          @endcode
   */
  
  #ifndef BLE_LBS_H__
  #define BLE_LBS_H__
  
  #include <stdint.h>
  #include <stdbool.h>
  #include "ble.h"
  #include "ble_srv_common.h"
  #include "nrf_sdh_ble.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /**@brief   Macro for defining a ble_lbs instance.
   *
   * @param   _name   Name of the instance.
   * @hideinitializer
   */
  #define BLE_LBS_DEF(_name)                                                                          \
  static ble_lbs_t _name;                                                                             \
  NRF_SDH_BLE_OBSERVER(_name ## _obs,                                                                 \
                       BLE_LBS_BLE_OBSERVER_PRIO,                                                     \
                       ble_lbs_on_ble_evt, &_name)
  
  #define LBS_UUID_BASE        {0x23, 0xD1, 0xBC, 0xEA, 0x5F, 0x78, 0x23, 0x15, \
                                0xDE, 0xEF, 0x12, 0x12, 0x00, 0x00, 0x00, 0x00}
  #define LBS_UUID_SERVICE     0x1523
  #define LBS_UUID_BUTTON_CHAR 0x1524
  #define LBS_UUID_LED_CHAR    0x1525
  
  
  // Forward declaration of the ble_lbs_t type.
  typedef struct ble_lbs_s ble_lbs_t;
  
  typedef void (*ble_lbs_led_write_handler_t) (uint16_t conn_handle, ble_lbs_t * p_lbs, uint8_t new_state);
  
  /** @brief LED Button Service init structure. This structure contains all options and data needed for
   *        initialization of the service.*/
  typedef struct
  {
      ble_lbs_led_write_handler_t led_write_handler; /**< Event handler to be called when the LED Characteristic is written. */
  } ble_lbs_init_t;
  
  /**@brief LED Button Service structure. This structure contains various status information for the service. */
  struct ble_lbs_s
  {
      uint16_t                    service_handle;      /**< Handle of LED Button Service (as provided by the BLE stack). */
      ble_gatts_char_handles_t    led_char_handles;    /**< Handles related to the LED Characteristic. */
      ble_gatts_char_handles_t    button_char_handles; /**< Handles related to the Button Characteristic. */
      uint8_t                     uuid_type;           /**< UUID type for the LED Button Service. */
      ble_lbs_led_write_handler_t led_write_handler;   /**< Event handler to be called when the LED Characteristic is written. */
  };
  
  
  /**@brief Function for initializing the LED Button Service.
   *
   * @param[out] p_lbs      LED Button Service structure. This structure must be supplied by
   *                        the application. It is initialized by this function and will later
   *                        be used to identify this particular service instance.
   * @param[in] p_lbs_init  Information needed to initialize the service.
   *
   * @retval NRF_SUCCESS If the service was initialized successfully. Otherwise, an error code is returned.
   */
  uint32_t ble_lbs_init(ble_lbs_t * p_lbs, const ble_lbs_init_t * p_lbs_init);
  
  
  /**@brief Function for handling the application's BLE stack events.
   *
   * @details This function handles all events from the BLE stack that are of interest to the LED Button Service.
   *
   * @param[in] p_ble_evt  Event received from the BLE stack.
   * @param[in] p_context  LED Button Service structure.
   */
  void ble_lbs_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context);
  
  
  /**@brief Function for sending a button state notification.
   *
   ' @param[in] conn_handle   Handle of the peripheral connection to which the button state notification will be sent.
   * @param[in] p_lbs         LED Button Service structure.
   * @param[in] button_state  New button state.
   *
   * @retval NRF_SUCCESS If the notification was sent successfully. Otherwise, an error code is returned.
   */
  uint32_t ble_lbs_on_button_change(uint16_t conn_handle, ble_lbs_t * p_lbs, uint8_t button_state);
  
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif // BLE_LBS_H__
  
  /** @} */
  