def __on_ping(self, ws, data):
        """The server periodically sends us websocket ping messages to keep the connection alive. To
        ensure that the connection to the server is still active, we memorize the most recent ping's time
        and we periodically ensure that a ping was received in __ensure_ping"""
        logging.debug("ConnectorDB:WS: ping")
        self.lastpingtime = time.time()
The server periodically sends us websocket ping messages to keep the connection alive. To
        ensure that the connection to the server is still active, we memorize the most recent ping's time
        and we periodically ensure that a ping was received in __ensure_ping