I recently wanted to reverse engineer some Websocket packets for a game I was playing. I used BurpSuite as a proxy to bypass the SSL encryption. It also has a pretty handy tool that will monitor all websocket traffic.

After that I used ImHex, pretty much exactly like in that blog to reverse engineer the websocket packets. The DSL is a little finicky but once you wrap your head around it, it`s very nice and powerful.