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/**
 * @brief Callback function format
 * 
 * @param pBuf : buffer pointer
 * @param size  : size of buffer
 * @param time : Time of event
 * @param timeslot :  timeslot information from the timing pattern modifier 
 * @param usr : user private object pointer
 */
void callback(void* pBuf, unsigned size,  epicsTimeStamp time, int timeslot, void* usr)