anchor.diff:  }
   
   
  +// David, not use in 'Catch'
  +//
   function onAddRemoteStream(token, evt){
     var remotevideo = document.createElement("video");
     remotevideo.id = genVideoId(token);
  
positive.code:   return pc;
  }
  
  
  function rtcSignalHandler(localMediaStream, myToken, evt) {
    var msg = JSON.parse(evt.data);
    console.log(msg);
  
negative.code: 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}
  