Controlling Esp unit from cloud using websockets?

Hi - yes, LoopbackB.write(digitalWrite(D5,1)); will fail because digitalWrite returns undefined. However if you're using loopback normally (just passing data from websockets) it shouldn't be an issue.

I'd be pretty sure your issue is that you're calling LoopbackA.setConsole(); at the start of upload.

What's happening is you call that, then the console moves out of the way to Loopback, and all code after that command gets ignored! :)

Add setTimeout(function() {LoopbackA.setConsole();},1o0); at the end of your code - or call setConsole when you actually get a websocket connection.