owner-nrf52sdk/nRF5_SDK_15.3.0/components/ble/common/ble_conn_params.h

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/** @file
 *
 * @defgroup ble_conn_params Connection Parameters Negotiation
 * @{
 * @ingroup ble_sdk_lib
 * @brief Module for initiating and executing a connection parameters negotiation procedure.
 */

#ifndef BLE_CONN_PARAMS_H__
#define BLE_CONN_PARAMS_H__

#include <stdint.h>
#include "ble.h"
#include "ble_srv_common.h"
#include "sdk_errors.h"

#ifdef __cplusplus
extern "C" {
#endif

/**@brief Connection Parameters Module event type. */
typedef enum
{
    BLE_CONN_PARAMS_EVT_FAILED,                                     //!< Negotiation procedure failed.
    BLE_CONN_PARAMS_EVT_SUCCEEDED                                   //!< Negotiation procedure succeeded.
} ble_conn_params_evt_type_t;

/**@brief Connection Parameters Module event. */
typedef struct
{
    ble_conn_params_evt_type_t evt_type;                            //!< Type of event.
    uint16_t                   conn_handle;                         //!< Connection the event refers to.
} ble_conn_params_evt_t;

/**@brief Connection Parameters Module event handler type. */
typedef void (*ble_conn_params_evt_handler_t) (ble_conn_params_evt_t * p_evt);

/**@brief Connection Parameters Module init structure. This contains all options and data needed for
 *        initialization of the connection parameters negotiation module. */
typedef struct
{
    ble_gap_conn_params_t *       p_conn_params;                    //!< Pointer to the connection parameters desired by the application. When calling ble_conn_params_init, if this parameter is set to NULL, the connection parameters will be fetched from host.
    uint32_t                      first_conn_params_update_delay;   //!< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (in number of timer ticks).
    uint32_t                      next_conn_params_update_delay;    //!< Time between each call to sd_ble_gap_conn_param_update after the first (in number of timer ticks). Recommended value 30 seconds as per BLUETOOTH SPECIFICATION Version 4.0.
    uint8_t                       max_conn_params_update_count;     //!< Number of attempts before giving up the negotiation.
    uint16_t                      start_on_notify_cccd_handle;      //!< If procedure is to be started when notification is started, set this to the handle of the corresponding CCCD. Set to BLE_GATT_HANDLE_INVALID if procedure is to be started on connect event.
    bool                          disconnect_on_fail;               //!< Set to TRUE if a failed connection parameters update shall cause an automatic disconnection, set to FALSE otherwise.
    ble_conn_params_evt_handler_t evt_handler;                      //!< Event handler to be called for handling events in the Connection Parameters.
    ble_srv_error_handler_t       error_handler;                    //!< Function to be called in case of an error.
} ble_conn_params_init_t;


/**@brief Function for initializing the Connection Parameters module.
 *
 * @note If the negotiation procedure should be triggered when notification/indication of
 *       any characteristic is enabled by the peer, then this function must be called after
 *       having initialized the services.
 *
 * @param[in]   p_init  This contains information needed to initialize this module.
 *
 * @retval      NRF_SUCCESS              Successful initialization.
 * @retval      NRF_ERROR_INVALID_ADDR   The provided Connection Parameters pointer is invalid.
 * @retval      NRF_ERROR_INVALID_PARAM  The provided Connection Parameters are not valid.
 * @retval      NRF_ERROR_NULL           @p p_init was NULL.
 * @retval      NRF_ERROR_INTERNAL       An unexpected error occurred.
 */
ret_code_t ble_conn_params_init(const ble_conn_params_init_t * p_init);

/**@brief Function for stopping the Connection Parameters module.
 *
 * @details This function is intended to be used by the application to clean up the connection
 *          parameters update module. This will stop the connection parameters update timer if
 *          running, thereby preventing any impending connection parameters update procedure. This
 *          function must be called by the application when it needs to clean itself up (for
 *          example, before disabling the bluetooth SoftDevice) so that an unwanted timer expiry
 *          event can be avoided.
 *
 * @retval      NRF_SUCCESS         Successfully stopped module.
 * @retval      NRF_ERROR_BUSY      Could not complete operation at this time. Try again later.
                                    Note that some timers may have been disabled.
 * @retval      NRF_ERROR_INTERNAL  An unexpected error occurred.
 */
ret_code_t ble_conn_params_stop(void);

/**@brief Function for changing the current connection parameters to a new set.
 *
 *  @details Use this function to change the connection parameters to a new set of parameter
 *       (ie different from the ones given at init of the module).
 *       This function is useful for scenario where most of the time the application
 *       needs a relatively big connection interval, and just sometimes, for a temporary
 *       period requires shorter connection interval, for example to transfer a higher
 *       amount of data.
 *       If the given parameters does not match the current connection's parameters
 *       this function initiates a new negotiation.
 *
 * @param[in]  conn_handle   The connection to change connection parameters on.
 * @param[in]  p_new_params  This contains the new connections parameters to setup.
 *
 * @retval NRF_SUCCESS                    Successfully started Connection Parameter update procedure.
 * @retval NRF_ERROR_INVALID_ADDR         The provided Connection Parameters pointer is invalid.
 * @retval NRF_ERROR_INVALID_PARAM        The provided Connection Parameters are not valid.
 * @retval BLE_ERROR_INVALID_CONN_HANDLE  The provided connection handle is invalid.
 * @retval NRF_ERROR_INVALID_STATE        The connection is not in a state where this operation can
 *                                        performed.
 * @retval NRF_ERROR_BUSY                 Could not start operation at this time. Try again later.
 * @retval NRF_ERROR_NO_MEM               The SoftDevice lacks the memory to perform the action.
 */
ret_code_t ble_conn_params_change_conn_params(uint16_t                conn_handle,
                                              ble_gap_conn_params_t * p_new_params);

#ifdef __cplusplus
}
#endif

#endif // BLE_CONN_PARAMS_H__

/** @} */