Be Polite
If your app is going to be using the controller detailed here must inform the user that you are now controlling the app. This is done by sending a message to WebSocket with a stringified JSON object in the form.

{
  "namespace": "connect",
  "method": "connect",
  "arguments": ["Name of Device / App"]
}

This command will trigger a response

{
  "channel": "connect",
  "payload": "CODE_REQUIRED"
}

A UI will popup in GPMDP containing a 4 digit code. You must instruct your user to provide this 4 digit code to you and you must then send it in the following form

{
  "namespace": "connect",
  "method": "connect",
  "arguments": ["Name of Device / App", "0000"]
}

If the code is incorrect the CODE_REQUIRED message will be sent to you again. If it is correct however you will receive a permanent authorization code in the following form

{
  "channel": "connect",
  "payload": "RANDOM_STRING_OF_CHARS_HERE"
}

As soon as you receive that message (and whenever you want to connect to the WebSocketAPI) you must simply send one message in the form.

{
  "namespace": "connect",
  "method": "connect",
  "arguments": ["Name of Device / App", "RANDOM_STRING_OF_CHARS_HERE"]
}