def adapter_add_nio_binding(self, adapter_number, nio):
        """
        Adds a port NIO binding.

        :param adapter_number: adapter number
        :param nio: NIO instance to add to the adapter
        """

        try:
            adapter = self._ethernet_adapters[adapter_number]
        except IndexError:
            raise QemuError('Adapter {adapter_number} does not exist on QEMU VM "{name}"'.format(name=self._name,
                                                                                                 adapter_number=adapter_number))

        if self.is_running():
            try:
                yield from self.add_ubridge_udp_connection("QEMU-{}-{}".format(self._id, adapter_number),
                                                           self._local_udp_tunnels[adapter_number][1],
                                                           nio)
            except (IndexError, KeyError):
                raise QemuError('Adapter {adapter_number} does not exist on QEMU VM "{name}"'.format(name=self._name,
                                                                                                     adapter_number=adapter_number))

        adapter.add_nio(0, nio)
        log.info('QEMU VM "{name}" [{id}]: {nio} added to adapter {adapter_number}'.format(name=self._name,
                                                                                           id=self._id,
                                                                                           nio=nio,
                                                                                           adapter_number=adapter_number))
Adds a port NIO binding.

        :param adapter_number: adapter number
        :param nio: NIO instance to add to the adapter