def ackSoon(self):
        """
        Emit an acknowledgement packet soon.
        """
        if self._ackTimer is None:
            def originateAck():
                self._ackTimer = None
                self.originate(ack=True)
            self._ackTimer = reactor.callLater(0.1, originateAck)
        else:
            self._ackTimer.reset(ACK_DELAY)