text: /**
   * Copyright (c) 2012 - 2017, Nordic Semiconductor ASA
   *
   * All rights reserved.
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   * are permitted provided that the following conditions are met:
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   *
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   * 4. This software, with or without modification, must only be used with a
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  /**@file
   *
   * @defgroup ble_its Nordic IMAGE TRANSFER Service
   * @{
   * @ingroup  ble_sdk_srv
   * @brief    Nordic IMAGE TRANSFER Service implementation.
   *
   * @details The Nordic IMAGE TRANSFER Service is a simple GATT-based service with TX and RX characteristics.
   *          Data received from the peer is passed to the application, and the data received
   *          from the application of this service is sent to the peer as Handle Value
   *          Notifications. This module demonstrates how to implement a custom GATT-based
   *          service and characteristics using the SoftDevice. The service
   *          is used by the application to send and receive ASCII text strings to and from the
   *          peer.
   *
   * @note The application must propagate SoftDevice events to the Nordic IMAGE TRANSFER Service module
   *       by calling the ble_its_on_ble_evt() function from the ble_stack_handler callback.
   */
  
  #ifndef BLE_IMAGE_TRANSFER_SERVICE_H__
  #define BLE_IMAGE_TRANSFER_SERVICE_H__
  
  #include "sdk_config.h"
  #include "ble.h"
  #include "ble_srv_common.h"
  #include "nrf_sdh_ble.h"
  #include "ble_link_ctx_manager.h"
  #include "app_util_platform.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /**@brief   Macro for defining a ble_its instance.
   *
   * @param     _name            Name of the instance.
   * @param[in] _nus_max_clients Maximum number of NUS clients connected at a time.
   * @hideinitializer
   */
  #define BLE_ITS_DEF(_name, _its_max_clients)                      \
          BLE_LINK_CTX_MANAGER_DEF(CONCAT_2(_name, _link_ctx_storage),  \
                                   (_its_max_clients),                  \
                                   sizeof(ble_its_client_context_t)); \
  static ble_its_t _name = {0, 0, {0,0,0,0},{0,0,0,0},{0,0,0,0}, \
                            0, 0, 0,                            \
                            &CONCAT_2(_name, _link_ctx_storage)};\
  NRF_SDH_BLE_OBSERVER(_name ## _obs,                           \
                       BLE_ITS_BLE_OBSERVER_PRIO,               \
                       ble_its_on_ble_evt,                      \
                       &_name)
  
  #define BLE_UUID_ITS_SERVICE 0x0001                      /**< The UUID of the Nordic IMAGE TRANSFER Service. */
  
  #define OPCODE_LENGTH 1
  #define HANDLE_LENGTH 2
  
  #if defined(NRF_SDH_BLE_GATT_MAX_MTU_SIZE) && (NRF_SDH_BLE_GATT_MAX_MTU_SIZE != 0)
      #define BLE_ITS_MAX_DATA_LEN (NRF_SDH_BLE_GATT_MAX_MTU_SIZE - OPCODE_LENGTH - HANDLE_LENGTH) /**< Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic IMAGE TRANSFER Service module. */
  #else
      #define BLE_ITS_MAX_DATA_LEN (NRF_SDH_BLE_GATT_MAX_MTU_SIZE_DEFAULT - OPCODE_LENGTH - HANDLE_LENGTH) /**< Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic IMAGE TRANSFER Service module. */
      #warning NRF_BLE_GATT_MAX_MTU_SIZE is not defined.
  #endif
  
  #define DBG_PIN_0 14
  #define DBG_PIN_1 15
  #define DBG_PIN_2 16
  #define DBG_PIN_3 3
  #define DBG_PIN_4 4
  
  
  /* Forward declaration of the ble_its_t type. */
  typedef struct ble_its_s ble_its_t;
  
  /**@brief Nordic IMAGE TRANSFER Service event handler type. */
  typedef void (*ble_its_data_handler_t) (ble_its_t * p_its, uint8_t const * p_data, uint16_t length);
  
  /**@brief Nordic IMAGE TRANSFER Service client context structure.
   *
   * @details This structure contains state context related to hosts.
   */
  typedef struct
  {
          bool is_notification_enabled; /**< Variable to indicate if the peer has enabled notification of the RX characteristic.*/
  } ble_its_client_context_t;
  
  /**@brief Nordic IMAGE TRANSFER Service initialization structure.
   *
   * @details This structure contains the initialization information for the service. The application
   * must fill this structure and pass it to the service using the @ref ble_its_init
   *          function.
   */
  typedef struct
  {
          ble_its_data_handler_t data_handler; /**< Event handler to be called for handling received data. */
  } ble_its_init_t;
  
  /**@brief Nordic IMAGE TRANSFER Service structure.
   *
   * @details This structure contains status information related to the service.
   */
  struct ble_its_s
  {
          uint8_t uuid_type;                            /**< UUID type for Nordic IMAGE TRANSFER Service Base UUID. */
          uint16_t service_handle;                      /**< Handle of Nordic IMAGE TRANSFER Service (as provided by the SoftDevice). */
          ble_gatts_char_handles_t tx_handles;          /**< Handles related to the TX characteristic (as provided by the SoftDevice). */
          ble_gatts_char_handles_t rx_handles;          /**< Handles related to the RX characteristic (as provided by the SoftDevice). */
          ble_gatts_char_handles_t img_info_handles;
          uint16_t conn_handle;                         /**< Handle of the current connection (as provided by the SoftDevice). BLE_CONN_HANDLE_INVALID if not in a connection. */
          bool is_notification_enabled;                 /**< Variable to indicate if the peer has enabled notification of the RX characteristic.*/
          bool is_info_char_notification_enabled;
          blcm_link_ctx_storage_t * const p_link_ctx_storage;
          ble_its_data_handler_t data_handler;          /**< Event handler to be called for handling received data. */
  };
  
  typedef struct ble_its_img_info_s
  {
          uint32_t file_size_bytes;
  
  } ble_its_img_info_t;
  
  typedef PACKED_STRUCT
  {
          uint16_t mtu;
          uint16_t con_interval;
          uint8_t tx_phy;
          uint8_t rx_phy;
  } ble_its_ble_params_info_t;
  
  /**@brief Function for initializing the Nordic IMAGE TRANSFER Service.
   *
   * @param[out] p_its      Nordic IMAGE TRANSFER 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_its_init  Information needed to initialize the service.
   *
   * @retval NRF_SUCCESS If the service was successfully initialized. Otherwise, an error code is returned.
   * @retval NRF_ERROR_NULL If either of the pointers p_its or p_its_init is NULL.
   */
  uint32_t ble_its_init(ble_its_t * p_its, const ble_its_init_t * p_its_init);
  
  /**@brief Function for handling the Nordic IMAGE TRANSFER Service's BLE events.
   *
   * @details The Nordic IMAGE TRANSFER Service expects the application to call this function each time an
   * event is received from the SoftDevice. This function processes the event if it
   * is relevant and calls the Nordic IMAGE TRANSFER Service event handler of the
   * application if necessary.
   *
   * @param[in] p_its       Nordic IMAGE TRANSFER Service structure.
   * @param[in] p_ble_evt   Event received from the SoftDevice.
   */
  void ble_its_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context);
  
  /**@brief Function for sending a string to the peer.
   *
   * @details This function sends the input string as an RX characteristic notification to the
   *          peer.
   *
   * @param[in] p_its       Pointer to the Nordic IMAGE TRANSFER Service structure.
   * @param[in] p_string    String to be sent.
   * @param[in] length      Length of the string.
   *
   * @retval NRF_SUCCESS If the string was sent successfully. Otherwise, an error code is returned.
   */
  uint32_t ble_its_string_send(ble_its_t * p_its, uint8_t * p_string, uint16_t length);
  
  uint32_t ble_its_ble_params_info_send(ble_its_t * p_its, ble_its_ble_params_info_t * ble_params_info);
  
  uint32_t ble_its_img_info_send(ble_its_t * p_its, ble_its_img_info_t * img_info);
  
  uint32_t ble_its_send_file(ble_its_t * p_its, uint8_t * p_data, uint32_t data_length, uint32_t max_packet_length);
  
  uint32_t ble_its_send_file_fragment(ble_its_t * p_its, uint8_t * p_data, uint32_t data_length);
  
  bool ble_its_file_transfer_busy(void);
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif // BLE_NUS_H__
  
  /** @} */
  