hzhang 4674c5a2b7 fix(socketio): remove broken client-initiated ping (engine.io v4) ...

The socket.io client was sending its own EIO ping frames every
pingInterval (default 25s). That's wrong for engine.io v4: in v4 the
SERVER initiates pings and the CLIENT must respond with pong inside
pingTimeout, else the server closes the connection. Client-initiated
pings get misinterpreted by Fabric's NestJS socket.io backend, which
quietly closes the connection — producing the warn-flap every ~25s:

  inbound: socket ended; reconnecting
    err="read: failed to get reader: received close frame:
         status = StatusNoStatusRcvd and reason = \"\""

Fix:
- delete pingLoop() entirely
- delete the pingPeriod/pingTimeout struct fields + their assignments
  in recvOpen (server enforces both anyway; client doesn't need them)
- keep the eioPing case in handlePacket (already correct — responds
  with pong)
- drop the now-unused "time" import

End-to-end verified on live Fabric:
- Restarted Plexum at 20:17:35; watched for 90+ seconds
- ZERO "socket ended" events (vs. ~3-4 per 90s before the fix)
- Channel inbound still delivers: alice posted seq=20 → gem agent
  (gemini CLI) replied seq=21 "pong"

The plugin no longer flaps. Reconnect backoff machinery (1s→60s)
stays in place as a safety net for genuine network drops.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

2026-05-31 20:19:58 +01:00

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