start publisher

def on_start(self):
        """
        start publisher
        """
        LOGGER.debug("zeromq.Publisher.on_start")
        try:
            self.zmqsocket.bind(self.zmqbind_url)
        except Exception as e:
            LOGGER.error("zeromq.Publisher.on_start - error while binding publisher ! " + e.__cause__)
            raise e