How are BigBlueButton messages received by other participants? I do not notice any new WebSocket message or request at each new received message on Chromium *Network*.
May 13, 1:06pm

In BigBlueButton, messages between participants are primarily exchanged using WebSockets for real-time communication. However, the way these messages are handled in the browser (especially in Chromium's DevTools Network tab) can be subtle and depends on how the WebSocket connection is implemented. Here’s what you need to know:

1. WebSocket Messages in BigBlueButton

  • BigBlueButton uses WebSockets (via the Socket.IO library in older versions or native WebSockets in newer ones) for real-time messaging between the server and clients.
  • WebSocket frames (e.g., text or binary) are not displayed as individual HTTP requests in the Network tab. Instead, they are part of a persistent WebSocket connection.

2. Why You Don’t See Messages in the Network Tab

  • WebSocket connections are long-lived and do not appear as discrete requests for each message. Instead:
    • The initial WebSocket handshake (HTTP upgrade request) appears in the Network tab (e.g., /ws or /socket.io/).
    • Subsequent messages are sent/received over this same connection and are not logged as separate entries in the Network tab.
  • To inspect WebSocket messages:
    1. Open Chrome DevTools (F12 or Ctrl+Shift+I).
    2. Go to the Network tab.
    3. Filter by WS (WebSocket) or look for the WebSocket connection (e.g., wss://your-bbb-server/ws).
    4. Click on the WebSocket connection, then switch to the Messages tab to see real-time frames.

3. Alternative: Console or Debug Logs

  • BigBlueButton’s client-side code (HTML5 client) often logs WebSocket events to the Console. Enable verbose logging:
    • In DevTools, go to the Console tab.
    • Look for logs like Received message: {type: "chat", ...} or Socket.IO: ....
  • If debugging is enabled on the server, you may also see logs in the browser’s console.

4. BigBlueButton-Specific Tools

  • Use the BigBlueButton HTML5 Client Debugger:
    • Append ?debug=true to the meeting URL (e.g., https://your-bbb-server/html5client/join?meetingID=...&debug=true).
    • This enables additional logging for WebSocket and Redux actions (used for state management in the client).
  • Check the Redux DevTools extension (if installed) to inspect state updates triggered by WebSocket messages.

5. Server-Side Inspection

  • On the BigBlueButton server, check the Akka (Scala) or Redis logs for message routing:
    • Akka handles WebSocket messaging for real-time features (chat, video, etc.).
    • Redis pub/sub is used for scaling across multiple nodes.
  • Logs are typically in /var/log/bigbluebutton/.

6. Common Pitfalls

  • Caching: Ensure DevTools is not throttling or caching WebSocket traffic.
  • Encryption: If using wss:// (secure WebSocket), the content is encrypted, but you can still see the raw frames in the Messages tab.
  • Message Batching: Some messages may be batched or compressed, especially in older Socket.IO versions.

How to Verify

  1. Open DevTools → Network tab.
  2. Reload the page and join the meeting.
  3. Look for a WebSocket connection (e.g., wss://.../ws).
  4. Click it → Messages tab → Send a chat message and observe incoming/outgoing frames.

Question for you: Are you inspecting a self-hosted BigBlueButton instance or a cloud-hosted one (e.g., Greenlight, Moodle plugin)? The setup might affect how messages are routed.

May 13, 1:06pm

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