HDLC_SEND_FAST_FLAG
if ((slen == 1) && (hdlc->state == HDLC_SEND_FAST_FLAG))
HDLC_SEND_FAST_FLAG;
case HDLC_SEND_FAST_FLAG:
HDLC_SEND_FAST_FLAG;
hdlc->state = HDLC_SEND_FAST_FLAG;