Update sumorobot.js

assets/js/sumorobot.js

@@ -64,7 +64,7 @@ Sumorobot.prototype.connect = function() {
         self.watchdogTimer = setInterval(function() {
             /* send a ping to the robot */
             //console.log("ping the robot")
-            self.send("ping");
+            self.send("{'to': 'sumo-" + robotId + "@00000514', 'cmd': 'ping'}");
         }, 500);
     };
     /* when the WebSocket closes */