You can definitely see the incoming/outgoing messages in the DevTools! Since it's a WebSocket connection, you must have the DevTools open and reload the page. Filter for the WebSocket network activity (you can quickly do this by selecting "WS"), and you'll find the WebSocket connection. Clicking on it and selecting the "Messages" sub-tab will let you see the live list of binary messages sent and received by the connection. Not too meaningful though, unfortunately.