Gets statistics for this NIO.

        :returns: NIO statistics (string with packets in, packets out, bytes in, bytes out)

def get_stats(self):
        """
        Gets statistics for this NIO.

        :returns: NIO statistics (string with packets in, packets out, bytes in, bytes out)
        """

        stats = yield from self._hypervisor.send("nio get_stats {}".format(self._name))
        return stats[0]