def _add_ubridge_connection(self, nio, port_number):
        """
        Creates a connection in uBridge.

        :param nio: NIO instance
        :param port_number: port number
        """

        port_info = None
        for port in self._ports_mapping:
            if port["port_number"] == port_number:
                port_info = port
                break

        if not port_info:
            raise NodeError("Port {port_number} doesn't exist on cloud '{name}'".format(name=self.name,
                                                                                        port_number=port_number))

        bridge_name = "{}-{}".format(self._id, port_number)
        yield from self._ubridge_send("bridge create {name}".format(name=bridge_name))
        if not isinstance(nio, NIOUDP):
            raise NodeError("Source NIO is not UDP")
        yield from self._ubridge_send('bridge add_nio_udp {name} {lport} {rhost} {rport}'.format(name=bridge_name,
                                                                                                 lport=nio.lport,
                                                                                                 rhost=nio.rhost,
                                                                                                 rport=nio.rport))

        yield from self._ubridge_apply_filters(bridge_name, nio.filters)
        if port_info["type"] in ("ethernet", "tap"):

            if sys.platform.startswith("win"):
                yield from self._add_ubridge_ethernet_connection(bridge_name, port_info["interface"])

            else:

                if port_info["type"] == "ethernet":
                    network_interfaces = [interface["name"] for interface in self._interfaces()]
                    if not port_info["interface"] in network_interfaces:
                        raise NodeError("Interface '{}' could not be found on this system".format(port_info["interface"]))

                    if sys.platform.startswith("linux"):
                        yield from self._add_linux_ethernet(port_info, bridge_name)
                    elif sys.platform.startswith("darwin"):
                        yield from self._add_osx_ethernet(port_info, bridge_name)
                    else:
                        yield from self._add_windows_ethernet(port_info, bridge_name)

                elif port_info["type"] == "tap":
                    yield from self._ubridge_send('bridge add_nio_tap {name} "{interface}"'.format(name=bridge_name, interface=port_info["interface"]))

        elif port_info["type"] == "udp":
            yield from self._ubridge_send('bridge add_nio_udp {name} {lport} {rhost} {rport}'.format(name=bridge_name,
                                                                                                     lport=port_info["lport"],
                                                                                                     rhost=port_info["rhost"],
                                                                                                     rport=port_info["rport"]))

        if nio.capturing:
            yield from self._ubridge_send('bridge start_capture {name} "{pcap_file}"'.format(name=bridge_name,
                                                                                             pcap_file=nio.pcap_output_file))

        yield from self._ubridge_send('bridge start {name}'.format(name=bridge_name))
Creates a connection in uBridge.

        :param nio: NIO instance
        :param port_number: port number