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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def start_server(self):
 """ Starts the TCP stream server, binding to the configured host and port. Host and port are configured via the command line arguments. .. note:: The server does not process requests unless :meth:`handle` is called in regular intervals. """

        if self._server is None:
            if self._options.telnet_mode:
                self.interface.in_terminator = '\r\n'
                self.interface.out_terminator = '\r\n'

            self._server = StreamServer(self._options.bind_address, self._options.port,
                                        self.interface, self.device_lock)