Adds a NIO as new port on this bridge.

        :param nio: NIO instance to add

def add_nio(self, nio):
        """
        Adds a NIO as new port on this bridge.

        :param nio: NIO instance to add
        """

        yield from self._hypervisor.send('nio_bridge add_nio "{name}" {nio}'.format(name=self._name, nio=nio))
        self._nios.append(nio)