def start(self, tcpport=102):
        """
        start the server.
        """
        if tcpport != 102:
            logger.info("setting server TCP port to %s" % tcpport)
            self.set_param(snap7.snap7types.LocalPort, tcpport)
        logger.info("starting server on 0.0.0.0:%s" % tcpport)
        return self.library.Srv_Start(self.pointer)
start the server.