Decode Bet365 In-Play Odds

I am working on analysing the in-play WebSocket traffic of Bet365 (already captured via browser DevTools).

I have already:

Captured raw WebSocket frames

Identified that messages are plain-text structured segments (e.g. EV;, OV;, IA;)

Observed updates related to in-play football markets

The task is NOT to bypass authentication, but to:

Decode the message structure.

Map message segments into structured JSON.

Extract:

Event ID

Sport

Market name

Selection name

Odds

Timestamp

Deliverables:

Technical explanation of message format.

A small Python or Node.js script that:

Connects to an already authenticated WebSocket session

Parses frames

Outputs structured JSON

5–10 minute sample capture (football in-play)

The WebSocket frames are already accessible; focus is parsing and structuring.

Experience with sportsbook feeds or protocol parsing is preferred.