def send_async(cls, port, message):
        """ Starts a new thread which sends a given message to a port """
        thread = Thread(target=cls.__send_message_async, args=(port, message), name="NC-SendAsync")
        thread.setDaemon(True)
        thread.start()
        return thread
 Starts a new thread which sends a given message to a port 
metadrive/render_pipeline/rpcore/util/network_communication.py