def start(self, timeout=None):
        """Start the server in a new thread.

        Parameters
        ----------
        timeout : float or None, optional
            Time in seconds to wait for server thread to start.

        """
        if self._handler_thread and self._handler_thread.isAlive():
            raise RuntimeError('Message handler thread already started')
        self._server.start(timeout)
        self.ioloop = self._server.ioloop
        if self._handler_thread:
            self._handler_thread.set_ioloop(self.ioloop)
            self._handler_thread.start(timeout)
Start the server in a new thread.

        Parameters
        ----------
        timeout : float or None, optional
            Time in seconds to wait for server thread to start.