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  /**
    @addtogroup BLE_GATTC Generic Attribute Profile (GATT) Client
    @{
    @brief  Definitions and prototypes for the GATT Client interface.
   */
  
  #ifndef BLE_GATTC_H__
  #define BLE_GATTC_H__
  
  #include "ble_gatt.h"
  #include "ble_types.h"
  #include "ble_ranges.h"
  #include "nrf_svc.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /** @addtogroup BLE_GATTC_ENUMERATIONS Enumerations
   * @{ */
  
  /**@brief GATTC API SVC numbers. */
  enum BLE_GATTC_SVCS
  {
    SD_BLE_GATTC_PRIMARY_SERVICES_DISCOVER = BLE_GATTC_SVC_BASE, /**< Primary Service Discovery. */
    SD_BLE_GATTC_RELATIONSHIPS_DISCOVER,                         /**< Relationship Discovery. */
    SD_BLE_GATTC_CHARACTERISTICS_DISCOVER,                       /**< Characteristic Discovery. */
    SD_BLE_GATTC_DESCRIPTORS_DISCOVER,                           /**< Characteristic Descriptor Discovery. */
    SD_BLE_GATTC_ATTR_INFO_DISCOVER,                             /**< Attribute Information Discovery. */
    SD_BLE_GATTC_CHAR_VALUE_BY_UUID_READ,                        /**< Read Characteristic Value by UUID. */
    SD_BLE_GATTC_READ,                                           /**< Generic read. */
    SD_BLE_GATTC_CHAR_VALUES_READ,                               /**< Read multiple Characteristic Values. */
    SD_BLE_GATTC_WRITE,                                          /**< Generic write. */
    SD_BLE_GATTC_HV_CONFIRM,                                     /**< Handle Value Confirmation. */
  };
  
  /**
   * @brief GATT Client Event IDs.
   */
  enum BLE_GATTC_EVTS
  {
    BLE_GATTC_EVT_PRIM_SRVC_DISC_RSP = BLE_GATTC_EVT_BASE,  /**< Primary Service Discovery Response event.      \n See @ref ble_gattc_evt_prim_srvc_disc_rsp_t.          */
    BLE_GATTC_EVT_REL_DISC_RSP,                             /**< Relationship Discovery Response event.         \n See @ref ble_gattc_evt_rel_disc_rsp_t.                */
    BLE_GATTC_EVT_CHAR_DISC_RSP,                            /**< Characteristic Discovery Response event.       \n See @ref ble_gattc_evt_char_disc_rsp_t.               */
    BLE_GATTC_EVT_DESC_DISC_RSP,                            /**< Descriptor Discovery Response event.           \n See @ref ble_gattc_evt_desc_disc_rsp_t.               */
    BLE_GATTC_EVT_ATTR_INFO_DISC_RSP,                       /**< Attribute Information Response event.          \n See @ref ble_gattc_evt_attr_info_disc_rsp_t. */
    BLE_GATTC_EVT_CHAR_VAL_BY_UUID_READ_RSP,                /**< Read By UUID Response event.                   \n See @ref ble_gattc_evt_char_val_by_uuid_read_rsp_t.   */
    BLE_GATTC_EVT_READ_RSP,                                 /**< Read Response event.                           \n See @ref ble_gattc_evt_read_rsp_t.                    */
    BLE_GATTC_EVT_CHAR_VALS_READ_RSP,                       /**< Read multiple Response event.                  \n See @ref ble_gattc_evt_char_vals_read_rsp_t.          */
    BLE_GATTC_EVT_WRITE_RSP,                                /**< Write Response event.                          \n See @ref ble_gattc_evt_write_rsp_t.                   */
    BLE_GATTC_EVT_HVX,                                      /**< Handle Value Notification or Indication event. \n Confirm indication with @ref sd_ble_gattc_hv_confirm.  \n See @ref ble_gattc_evt_hvx_t. */
    BLE_GATTC_EVT_TIMEOUT                                   /**< Timeout event.                                 \n See @ref ble_gattc_evt_timeout_t.                     */
  };
  
  /** @} */
  
  /** @addtogroup BLE_GATTC_DEFINES Defines
   * @{ */
  
  /** @defgroup BLE_ERRORS_GATTC SVC return values specific to GATTC
   * @{ */
  #define BLE_ERROR_GATTC_PROC_NOT_PERMITTED    (NRF_GATTC_ERR_BASE + 0x000) /**< Procedure not Permitted. */
  /** @} */
  
  /** @defgroup BLE_GATTC_ATTR_INFO_FORMAT Attribute Information Formats
   * @{ */
  #define BLE_GATTC_ATTR_INFO_FORMAT_16BIT    1 /**< 16-bit Attribute Information Format. */
  #define BLE_GATTC_ATTR_INFO_FORMAT_128BIT   2 /**< 128-bit Attribute Information Format. */
  /** @} */
  
  /** @} */
  
  /** @addtogroup BLE_GATTC_STRUCTURES Structures
   * @{ */
  
  /**@brief Operation Handle Range. */
  typedef struct
  {
    uint16_t          start_handle; /**< Start Handle. */
    uint16_t          end_handle;   /**< End Handle. */
  } ble_gattc_handle_range_t;
  
  
  /**@brief GATT service. */
  typedef struct
  {
    ble_uuid_t               uuid;          /**< Service UUID. */
    ble_gattc_handle_range_t handle_range;  /**< Service Handle Range. */
  } ble_gattc_service_t;
  
  
  /**@brief  GATT include. */
  typedef struct
  {
    uint16_t            handle;           /**< Include Handle. */
    ble_gattc_service_t included_srvc;    /**< Handle of the included service. */
  } ble_gattc_include_t;
  
  
  /**@brief GATT characteristic. */
  typedef struct
  {
    ble_uuid_t              uuid;                 /**< Characteristic UUID. */
    ble_gatt_char_props_t   char_props;           /**< Characteristic Properties. */
    uint8_t                 char_ext_props : 1;   /**< Extended properties present. */
    uint16_t                handle_decl;          /**< Handle of the Characteristic Declaration. */
    uint16_t                handle_value;         /**< Handle of the Characteristic Value. */
  } ble_gattc_char_t;
  
  
  /**@brief GATT descriptor. */
  typedef struct
  {
    uint16_t          handle;         /**< Descriptor Handle. */
    ble_uuid_t        uuid;           /**< Descriptor UUID. */
  } ble_gattc_desc_t;
  
  
  /**@brief Write Parameters. */
  typedef struct
  {
    uint8_t    write_op;                 /**< Write Operation to be performed, see @ref BLE_GATT_WRITE_OPS. */
    uint8_t    flags;                    /**< Flags, see @ref BLE_GATT_EXEC_WRITE_FLAGS. */
    uint16_t   handle;                   /**< Handle to the attribute to be written. */
    uint16_t   offset;                   /**< Offset in bytes. @note For WRITE_CMD and WRITE_REQ, offset must be 0. */
    uint16_t   len;                      /**< Length of data in bytes. */
    uint8_t   *p_value;                  /**< Pointer to the value data. */
  } ble_gattc_write_params_t;
  
  /**@brief Attribute Information. */
  typedef struct
  {
    uint16_t      handle;                /**< Attribute handle. */
    union {
      ble_uuid_t    uuid16;              /**< 16-bit Attribute UUID. */
      ble_uuid128_t uuid128;             /**< 128-bit Attribute UUID. */
    } info;
  } ble_gattc_attr_info_t;
  
  /**@brief Event structure for @ref BLE_GATTC_EVT_PRIM_SRVC_DISC_RSP. */
  typedef struct
  {
    uint16_t             count;           /**< Service count. */
    ble_gattc_service_t services[1];      /**< Service data. @note This is a variable length array. The size of 1 indicated is only a placeholder for compilation.
                                               See @ref sd_ble_evt_get for more information on how to use event structures with variable length array members. */
  } ble_gattc_evt_prim_srvc_disc_rsp_t;
  
  /**@brief Event structure for @ref BLE_GATTC_EVT_REL_DISC_RSP. */
  typedef struct
  {
    uint16_t             count;           /**< Include count. */
    ble_gattc_include_t includes[1];      /**< Include data. @note This is a variable length array. The size of 1 indicated is only a placeholder for compilation.
                                               See @ref sd_ble_evt_get for more information on how to use event structures with variable length array members. */
  } ble_gattc_evt_rel_disc_rsp_t;
  
  /**@brief Event structure for @ref BLE_GATTC_EVT_CHAR_DISC_RSP. */
  typedef struct
  {
    uint16_t            count;          /**< Characteristic count. */
    ble_gattc_char_t    chars[1];       /**< Characteristic data. @note This is a variable length array. The size of 1 indicated is only a placeholder for compilation.
                                             See @ref sd_ble_evt_get for more information on how to use event structures with variable length array members. */
  } ble_gattc_evt_char_disc_rsp_t;
  
  /**@brief Event structure for @ref BLE_GATTC_EVT_DESC_DISC_RSP. */
  typedef struct
  {
    uint16_t            count;          /**< Descriptor count. */
    ble_gattc_desc_t    descs[1];       /**< Descriptor data. @note This is a variable length array. The size of 1 indicated is only a placeholder for compilation.
                                             See @ref sd_ble_evt_get for more information on how to use event structures with variable length array members. */
  } ble_gattc_evt_desc_disc_rsp_t;
  
  /**@brief Event structure for @ref BLE_GATTC_EVT_ATTR_INFO_DISC_RSP. */
  typedef struct
  {
    uint16_t                     count;        /**< Attribute count. */
    uint8_t                      format;       /**< Attribute information format, see @ref BLE_GATTC_ATTR_INFO_FORMAT. */
    ble_gattc_attr_info_t        attr_info[1]; /**< Attribute information. @note This is a variable length array. The size of 1 indicated is only a placeholder for compilation.
                                             See @ref sd_ble_evt_get for more information on how to use event structures with variable length array members. */
  } ble_gattc_evt_attr_info_disc_rsp_t;
  
  /**@brief GATT read by UUID handle value pair. */
  typedef struct 
  {
    uint16_t            handle;          /**< Attribute Handle. */
    uint8_t             *p_value;        /**< Pointer to value, variable length (length available as value_len in @ref ble_gattc_evt_char_val_by_uuid_read_rsp_t). 
                                              Please note that this pointer is absolute to the memory provided by the user when retrieving the event,
                                              so it will effectively point to a location inside the handle_value array. */
  } ble_gattc_handle_value_t;
  
  /**@brief Event structure for @ref BLE_GATTC_EVT_CHAR_VAL_BY_UUID_READ_RSP. */
  typedef struct
  {
    uint16_t                  count;            /**< Handle-Value Pair Count. */
    uint16_t                  value_len;        /**< Length of the value in Handle-Value(s) list. */
    ble_gattc_handle_value_t  handle_value[1];  /**< Handle-Value(s) list. @note This is a variable length array. The size of 1 indicated is only a placeholder for compilation.
                                                     See @ref sd_ble_evt_get for more information on how to use event structures with variable length array members. */
  } ble_gattc_evt_char_val_by_uuid_read_rsp_t;
  
  /**@brief Event structure for @ref BLE_GATTC_EVT_READ_RSP. */
  typedef struct
  {
    uint16_t            handle;         /**< Attribute Handle. */
    uint16_t            offset;         /**< Offset of the attribute data. */
    uint16_t            len;            /**< Attribute data length. */
    uint8_t             data[1];        /**< Attribute data. @note This is a variable length array. The size of 1 indicated is only a placeholder for compilation.
                                             See @ref sd_ble_evt_get for more information on how to use event structures with variable length array members. */
  } ble_gattc_evt_read_rsp_t;
  
  /**@brief Event structure for @ref BLE_GATTC_EVT_CHAR_VALS_READ_RSP. */
  typedef struct
  {
    uint16_t            len;            /**< Concatenated Attribute values length. */
    uint8_t             values[1];      /**< Attribute values. @note This is a variable length array. The size of 1 indicated is only a placeholder for compilation.
                                             See @ref sd_ble_evt_get for more information on how to use event structures with variable length array members. */
  } ble_gattc_evt_char_vals_read_rsp_t;
  
  /**@brief Event structure for @ref BLE_GATTC_EVT_WRITE_RSP. */
  typedef struct
  {
    uint16_t            handle;           /**< Attribute Handle. */
    uint8_t             write_op;         /**< Type of write operation, see @ref BLE_GATT_WRITE_OPS. */
    uint16_t            offset;           /**< Data offset. */
    uint16_t            len;              /**< Data length. */
    uint8_t             data[1];          /**< Data. @note This is a variable length array. The size of 1 indicated is only a placeholder for compilation.
                                               See @ref sd_ble_evt_get for more information on how to use event structures with variable length array members. */
  } ble_gattc_evt_write_rsp_t;
  
  /**@brief Event structure for @ref BLE_GATTC_EVT_HVX. */
  typedef struct
  {
    uint16_t            handle;         /**< Handle to which the HVx operation applies. */
    uint8_t             type;           /**< Indication or Notification, see @ref BLE_GATT_HVX_TYPES. */
    uint16_t            len;            /**< Attribute data length. */
    uint8_t             data[1];        /**< Attribute data. @note This is a variable length array. The size of 1 indicated is only a placeholder for compilation.
                                             See @ref sd_ble_evt_get for more information on how to use event structures with variable length array members. */
  } ble_gattc_evt_hvx_t;
  
  /**@brief Event structure for @ref BLE_GATTC_EVT_TIMEOUT. */
  typedef struct
  {
    uint8_t          src;                       /**< Timeout source, see @ref BLE_GATT_TIMEOUT_SOURCES. */
  } ble_gattc_evt_timeout_t;
  
  /**@brief GATTC event structure. */
  typedef struct
  {
    uint16_t            conn_handle;                /**< Connection Handle on which event occured. */
    uint16_t            gatt_status;                /**< GATT status code for the operation, see @ref BLE_GATT_STATUS_CODES. */
    uint16_t            error_handle;               /**< In case of error: The handle causing the error. In all other cases @ref BLE_GATT_HANDLE_INVALID. */
    union
    {
      ble_gattc_evt_prim_srvc_disc_rsp_t          prim_srvc_disc_rsp;         /**< Primary Service Discovery Response Event Parameters. */
      ble_gattc_evt_rel_disc_rsp_t                rel_disc_rsp;               /**< Relationship Discovery Response Event Parameters. */
      ble_gattc_evt_char_disc_rsp_t               char_disc_rsp;              /**< Characteristic Discovery Response Event Parameters. */
      ble_gattc_evt_desc_disc_rsp_t               desc_disc_rsp;              /**< Descriptor Discovery Response Event Parameters. */
      ble_gattc_evt_char_val_by_uuid_read_rsp_t   char_val_by_uuid_read_rsp;  /**< Characteristic Value Read by UUID Response Event Parameters. */
      ble_gattc_evt_read_rsp_t                    read_rsp;                   /**< Read Response Event Parameters. */
      ble_gattc_evt_char_vals_read_rsp_t          char_vals_read_rsp;         /**< Characteristic Values Read Response Event Parameters. */
      ble_gattc_evt_write_rsp_t                   write_rsp;                  /**< Write Response Event Parameters. */
      ble_gattc_evt_hvx_t                         hvx;                        /**< Handle Value Notification/Indication Event Parameters. */
      ble_gattc_evt_timeout_t                     timeout;                    /**< Timeout Event Parameters. */
      ble_gattc_evt_attr_info_disc_rsp_t          attr_info_disc_rsp;         /**< Attribute Information Discovery Event Parameters. */
    } params;                                                                 /**< Event Parameters. @note Only valid if @ref gatt_status == @ref BLE_GATT_STATUS_SUCCESS. */
  } ble_gattc_evt_t;
  /** @} */
  
  /** @addtogroup BLE_GATTC_FUNCTIONS Functions
   * @{ */
  
  /**@brief Initiate or continue a GATT Primary Service Discovery procedure.
   *
   * @details This function initiates or resumes a Primary Service discovery procedure, starting from the supplied handle. 
   *          If the last service has not been reached, this function must be called again with an updated start handle value to continue the search.
   *
   * @note If any of the discovered services have 128-bit UUIDs which are not present in the table provided to ble_vs_uuids_assign, a UUID structure with
   *       type @ref BLE_UUID_TYPE_UNKNOWN will be received in the corresponding event.
   *
   * @events
   * @event{@ref BLE_GATTC_EVT_PRIM_SRVC_DISC_RSP}
   * @endevents
   *       
   * @mscs
   * @mmsc{@ref BLE_GATTC_PRIM_SRVC_DISC_MSC}
   * @endmscs
   * 
   * @param[in] conn_handle The connection handle identifying the connection to perform this procedure on.
   * @param[in] start_handle Handle to start searching from.
   * @param[in] p_srvc_uuid Pointer to the service UUID to be found. If it is NULL, all primary services will be returned.
   *
   * @retval ::NRF_SUCCESS Successfully started or resumed the Primary Service Discovery procedure.
   * @retval ::BLE_ERROR_INVALID_CONN_HANDLE Invalid Connection Handle.
   * @retval ::NRF_ERROR_INVALID_STATE Invalid Connection State.
   * @retval ::NRF_ERROR_INVALID_PARAM Invalid parameter(s) supplied.
   * @retval ::NRF_ERROR_BUSY Client procedure already in progress.
   */
  SVCALL(SD_BLE_GATTC_PRIMARY_SERVICES_DISCOVER, uint32_t, sd_ble_gattc_primary_services_discover(uint16_t conn_handle, uint16_t start_handle, ble_uuid_t const *p_srvc_uuid));
  
  
  /**@brief Initiate or continue a GATT Relationship Discovery procedure.
   *
   * @details This function initiates or resumes the Find Included Services sub-procedure. If the last included service has not been reached,
   *          this must be called again with an updated handle range to continue the search.
   *
   * @events
   * @event{@ref BLE_GATTC_EVT_REL_DISC_RSP}
   * @endevents
   *          
   * @mscs
   * @mmsc{@ref BLE_GATTC_REL_DISC_MSC}
   * @endmscs
   * 
   * @param[in] conn_handle The connection handle identifying the connection to perform this procedure on.
   * @param[in] p_handle_range A pointer to the range of handles of the Service to perform this procedure on.
   *
   * @retval ::NRF_SUCCESS Successfully started or resumed the Relationship Discovery procedure.
   * @retval ::BLE_ERROR_INVALID_CONN_HANDLE Invalid Connection Handle.
   * @retval ::NRF_ERROR_INVALID_STATE Invalid Connection State.
   * @retval ::NRF_ERROR_INVALID_ADDR Invalid pointer supplied.
   * @retval ::NRF_ERROR_INVALID_PARAM Invalid parameter(s) supplied.
   * @retval ::NRF_ERROR_BUSY Client procedure already in progress.
   */
  SVCALL(SD_BLE_GATTC_RELATIONSHIPS_DISCOVER, uint32_t, sd_ble_gattc_relationships_discover(uint16_t conn_handle, ble_gattc_handle_range_t const *p_handle_range));
  
  
  /**@brief Initiate or continue a GATT Characteristic Discovery procedure.
   *
   * @details This function initiates or resumes a Characteristic discovery procedure. If the last Characteristic has not been reached,
   *          this must be called again with an updated handle range to continue the discovery.
   *
   * @note If any of the discovered characteristics have 128-bit UUIDs which are not present in the table provided to ble_vs_uuids_assign, a UUID structure with
   *       type @ref BLE_UUID_TYPE_UNKNOWN will be received in the corresponding event.
   *
   * @events
   * @event{@ref BLE_GATTC_EVT_CHAR_DISC_RSP}
   * @endevents
   *
   * @mscs
   * @mmsc{@ref BLE_GATTC_CHAR_DISC_MSC}
   * @endmscs
   * 
   * @param[in] conn_handle The connection handle identifying the connection to perform this procedure on.
   * @param[in] p_handle_range A pointer to the range of handles of the Service to perform this procedure on.
   *
   * @retval ::NRF_SUCCESS Successfully started or resumed the Characteristic Discovery procedure.
   * @retval ::BLE_ERROR_INVALID_CONN_HANDLE Invalid Connection Handle.
   * @retval ::NRF_ERROR_INVALID_STATE Invalid Connection State.
   * @retval ::NRF_ERROR_INVALID_ADDR Invalid pointer supplied.
   * @retval ::NRF_ERROR_BUSY Client procedure already in progress.
   */
  SVCALL(SD_BLE_GATTC_CHARACTERISTICS_DISCOVER, uint32_t, sd_ble_gattc_characteristics_discover(uint16_t conn_handle, ble_gattc_handle_range_t const *p_handle_range));
  
  
  /**@brief Initiate or continue a GATT Characteristic Descriptor Discovery procedure.
   *
   * @details This function initiates or resumes a Characteristic Descriptor discovery procedure. If the last Descriptor has not been reached,
   *          this must be called again with an updated handle range to continue the discovery.
   *
   * @events
   * @event{BLE_GATTC_EVT_DESC_DISC_RSP}
   * @endevents
   *
   * @mscs
   * @mmsc{@ref BLE_GATTC_DESC_DISC_MSC}
   * @endmscs
   * 
   * @param[in] conn_handle The connection handle identifying the connection to perform this procedure on.
   * @param[in] p_handle_range A pointer to the range of handles of the Characteristic to perform this procedure on.
   *
   * @retval ::NRF_SUCCESS Successfully started or resumed the Descriptor Discovery procedure.
   * @retval ::BLE_ERROR_INVALID_CONN_HANDLE Invalid Connection Handle.
   * @retval ::NRF_ERROR_INVALID_STATE Invalid Connection State.
   * @retval ::NRF_ERROR_INVALID_ADDR Invalid pointer supplied.
   * @retval ::NRF_ERROR_BUSY Client procedure already in progress.
   */
  SVCALL(SD_BLE_GATTC_DESCRIPTORS_DISCOVER, uint32_t, sd_ble_gattc_descriptors_discover(uint16_t conn_handle, ble_gattc_handle_range_t const *p_handle_range));
  
  
  /**@brief Initiate or continue a GATT Read using Characteristic UUID procedure.
   *
   * @details This function initiates or resumes a Read using Characteristic UUID procedure. If the last Characteristic has not been reached,
   *          this must be called again with an updated handle range to continue the discovery.
   *
   * @events
   * @event{BLE_GATTC_EVT_DESC_DISC_RSP}
   * @endevents
   *          
   * @mscs
   * @mmsc{@ref BLE_GATTC_READ_UUID_MSC}
   * @endmscs
   * 
   * @param[in] conn_handle The connection handle identifying the connection to perform this procedure on.
   * @param[in] p_uuid Pointer to a Characteristic value UUID to read.
   * @param[in] p_handle_range A pointer to the range of handles to perform this procedure on.
   *
   * @retval ::NRF_SUCCESS Successfully started or resumed the Read using Characteristic UUID procedure.
   * @retval ::BLE_ERROR_INVALID_CONN_HANDLE Invalid Connection Handle.
   * @retval ::NRF_ERROR_INVALID_STATE Invalid Connection State.
   * @retval ::NRF_ERROR_INVALID_ADDR Invalid pointer supplied.
   * @retval ::NRF_ERROR_BUSY Client procedure already in progress.
   */
  SVCALL(SD_BLE_GATTC_CHAR_VALUE_BY_UUID_READ, uint32_t, sd_ble_gattc_char_value_by_uuid_read(uint16_t conn_handle, ble_uuid_t const *p_uuid, ble_gattc_handle_range_t const *p_handle_range));
  
  
  /**@brief Initiate or continue a GATT Read (Long) Characteristic or Descriptor procedure.
   *
   * @details This function initiates or resumes a GATT Read (Long) Characteristic or Descriptor procedure. If the Characteristic or Descriptor
   *          to be read is longer than ATT_MTU - 1, this function must be called multiple times with appropriate offset to read the 
   *          complete value.
   *
   * @events
   * @event{@ref BLE_GATTC_EVT_CHAR_VAL_BY_UUID_READ_RSP}
   * @endevents
   *          
   * @mscs
   * @mmsc{@ref BLE_GATTC_VALUE_READ_MSC}
   * @endmscs
   * 
   * @param[in] conn_handle The connection handle identifying the connection to perform this procedure on.
   * @param[in] handle The handle of the attribute to be read.
   * @param[in] offset Offset into the attribute value to be read.
   *
   * @retval ::NRF_SUCCESS Successfully started or resumed the Read (Long) procedure.
   * @retval ::BLE_ERROR_INVALID_CONN_HANDLE Invalid Connection Handle.
   * @retval ::NRF_ERROR_INVALID_STATE Invalid Connection State.
   * @retval ::NRF_ERROR_BUSY Client procedure already in progress.
   */
  SVCALL(SD_BLE_GATTC_READ, uint32_t, sd_ble_gattc_read(uint16_t conn_handle, uint16_t handle, uint16_t offset));
  
  
  /**@brief Initiate a GATT Read Multiple Characteristic Values procedure.
   *
   * @details This function initiates a GATT Read Multiple Characteristic Values procedure. 
   *
   * @events
   * @event{@ref BLE_GATTC_EVT_CHAR_VALS_READ_RSP}
   * @endevents
   * 
   * @mscs
   * @mmsc{@ref BLE_GATTC_READ_MULT_MSC}
   * @endmscs
   * 
   * @param[in] conn_handle The connection handle identifying the connection to perform this procedure on.
   * @param[in] p_handles A pointer to the handle(s) of the attribute(s) to be read.
   * @param[in] handle_count The number of handles in p_handles.
   *
   * @retval ::NRF_SUCCESS Successfully started the Read Multiple Characteristic Values procedure.
   * @retval ::BLE_ERROR_INVALID_CONN_HANDLE Invalid Connection Handle.
   * @retval ::NRF_ERROR_INVALID_STATE Invalid Connection State.
   * @retval ::NRF_ERROR_INVALID_ADDR Invalid pointer supplied.
   * @retval ::NRF_ERROR_BUSY Client procedure already in progress.
   */
  SVCALL(SD_BLE_GATTC_CHAR_VALUES_READ, uint32_t, sd_ble_gattc_char_values_read(uint16_t conn_handle, uint16_t const *p_handles, uint16_t handle_count));
  
  
  /**@brief Perform a Write (Characteristic Value or Descriptor, with or without response, signed or not, long or reliable) procedure.
   *
   * @details This function can perform all write procedures described in GATT. 
   *
   * @note    It is important to note that a write without response will <b>consume an application buffer</b>, and will therefore 
   *          generate a @ref BLE_EVT_TX_COMPLETE event when the packet has been transmitted. A write (with response) on the other hand will use the 
   *          standard client internal buffer and thus will only generate a @ref BLE_GATTC_EVT_WRITE_RSP event as soon as the write response 
   *          has been received from the peer. Please see the documentation of @ref sd_ble_tx_packet_count_get for more details.
   *
   * @events
   * @event{@ref BLE_GATTC_EVT_WRITE_RSP, Generated when using write request or queued writes.}
   * @endevents
   *          
   * @mscs
   * @mmsc{@ref BLE_GATTC_VALUE_WRITE_MSC}
   * @mmsc{@ref BLE_GATTC_VALUE_LONG_WRITE_MSC}
   * @mmsc{@ref BLE_GATTC_VALUE_RELIABLE_WRITE_MSC}
   * @mmsc{@ref BLE_COMMON_APP_BUFF_MSC}
   * @endmscs
   * 
   * @param[in] conn_handle The connection handle identifying the connection to perform this procedure on.
   * @param[in] p_write_params A pointer to a write parameters structure.
   *
   * @retval ::NRF_SUCCESS Successfully started the Write procedure.
   * @retval ::BLE_ERROR_INVALID_CONN_HANDLE Invalid Connection Handle.
   * @retval ::NRF_ERROR_INVALID_STATE Invalid Connection State.
   * @retval ::NRF_ERROR_INVALID_ADDR Invalid pointer supplied.
   * @retval ::NRF_ERROR_INVALID_PARAM Invalid parameter(s) supplied.
   * @retval ::NRF_ERROR_DATA_SIZE Invalid data size(s) supplied.
   * @retval ::NRF_ERROR_BUSY Procedure already in progress.
   * @retval ::BLE_ERROR_NO_TX_PACKETS No available application packets for this connection.
   */
  SVCALL(SD_BLE_GATTC_WRITE, uint32_t, sd_ble_gattc_write(uint16_t conn_handle, ble_gattc_write_params_t const *p_write_params));
  
  
  /**@brief Send a Handle Value Confirmation to the GATT Server.
   * 
   * @mscs
   * @mmsc{@ref BLE_GATTC_HVI_MSC}
   * @endmscs
   * 
   * @param[in] conn_handle The connection handle identifying the connection to perform this procedure on.
   * @param[in] handle The handle of the attribute in the indication.
   *
   * @retval ::NRF_SUCCESS Successfully queued the Handle Value Confirmation for transmission.
   * @retval ::BLE_ERROR_INVALID_CONN_HANDLE Invalid Connection Handle.
   * @retval ::NRF_ERROR_INVALID_STATE Invalid Connection State or no Indication pending to be confirmed.
   * @retval ::BLE_ERROR_INVALID_ATTR_HANDLE Invalid attribute handle.
   */
  SVCALL(SD_BLE_GATTC_HV_CONFIRM, uint32_t, sd_ble_gattc_hv_confirm(uint16_t conn_handle, uint16_t handle));
  
  /**@brief Discovers information about a range of attributes on a GATT server.
   *
   * @events
   * @event{@ref BLE_GATTC_EVT_ATTR_INFO_DISC_RSP, Generated when information about a range of attributes has been received.}
   * @endevents
   *
   * @param[in] conn_handle    The connection handle identifying the connection to perform this procedure on.
   * @param[in] p_handle_range The range of handles to request information about.
   *
   * @retval ::NRF_SUCCESS Successfully started an attribute information discovery procedure.
   * @retval ::BLE_ERROR_INVALID_CONN_HANDLE Invalid connection handle.
   * @retval ::NRF_ERROR_INVALID_STATE Invalid connection state
   * @retval ::NRF_ERROR_INVALID_ADDR  Invalid pointer supplied.
   * @retval ::NRF_ERROR_BUSY Client procedure already in progress.
   */
  SVCALL(SD_BLE_GATTC_ATTR_INFO_DISCOVER, uint32_t, sd_ble_gattc_attr_info_discover(uint16_t conn_handle, ble_gattc_handle_range_t const * p_handle_range));
  
  /** @} */
  
  #ifdef __cplusplus
  }
  #endif
  #endif /* BLE_GATTC_H__ */
  
  /**
    @}
    @}
  */
  