This repository describes how notifications, streaming, and LiveView works via the Remarkale2 API. The bulk of the information is on the wiki. It has extensive detail on how to subscribe to RM's websocket events and how to parse LiveView data.
liveview.bin Contains an exmaple binary payload coming from the LiveView websocket stream.
liveview.json Contains an exmaple of the binary payload parsed as human-readable JSON. (I've removed a lot of the data from this version just for readability.)