gistfile1.js

// create a CastMessageBus to handle messages for a custom namespace
  window.messageBus =
    window.castReceiverManager.getCastMessageBus(
        'urn:x-cast:com.hsienwei.test2048');

  // handler for the CastMessageBus message event
  window.messageBus.onMessage = function(event) {
    console.log('Message [' + event.senderId + ']: ' + event.data);
    
    if ( event.data == "continue") {
        self.keepPlaying.call(self, event);
    }
    // restart key code
    if ( event.data == "82") {
        self.restart.call(self, event);
    }
    else {
        var mapped    = map[event.data];
        if (mapped !== undefined) {
            event.preventDefault();
            self.emit("move", mapped);
        }
    }
    
    window.messageBus.send(event.senderId, event.data + window.senderId);
  }

  // initialize the CastReceiverManager with an application status message
  window.castReceiverManager.start({statusText: "Application is starting"});
  console.log('Receiver Manager started');