anchor.diff:  console.log("controllerData", controllerData);
   var room = controllerData["Room"];
   
  +// David, send signal/message to server
  +//
   function sendSignal(destinations, message) {
     var body = JSON.stringify(message);
     var data = {"destinations": destinations, "body": body}
  
positive.code:   setTimeout(function(){ video.play() }, 1000);
  }
  
  
  function getLocalMedia(callback) {
    mediaConstraints = {video: true, audio: true};
  
  
negative.code:   return pc;
  }
  
  // David, main RTC handler for all RTC events
  //
  function rtcSignalHandler(localMediaStream, myToken, evt) {
    var msg = JSON.parse(evt.data);
    console.log(msg);
  