/* function to register callback to be called when device gets disconnected  */
void register_ble_disconnected_event_cb(ble_gap_event_callback_t disconnected_cb_fn)
/* function to register callback to be called when device gets disconnected  */
void register_ble_disconnected_event_cb(ble_gap_event_callback_t disconnected_cb_fn)
{
	ble_disconnected_cb = disconnected_cb_fn;
}