DPM Synchronization handshake not handled correctly.

if the IRT is active the stack shall set the sync mode to RCX_SYNC_MODE_DEV_CTRL. This is necessary to allow the host application to acknowledge the sync event.
and before the start of Cycle can be indicated the stack also shall check whether the sync event is acknowledged by the Host application, if not the counter of Synchronization handshake errors (bErrorSyncCnt) is incremented.