def listenUDP(port, protocol, interface='', maxPacketSize=8192):
    """
        Connects a given L{DatagramProtocol} to the given numeric UDP port.

        @param port: A port number on which to listen.
        @type port: C{int}

        @param protocol: A L{DatagramProtocol} instance which will be
            connected to the given C{port}.
        @type protocol: L{DatagramProtocol}

        @param interface: The local IPv4 or IPv6 address to which to bind;
            defaults to '', ie all IPv4 addresses.
        @type interface: C{str}

        @param maxPacketSize: The maximum packet size to accept.
        @type maxPacketSize: C{int}

        @return: object which provides L{IListeningPort}.
        """
