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00e75fff72b1d18450e35c0e5bc93a6f18b3287b
bitchat/connection_fixes.md
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jack 00e75fff72 Fix connect/disconnect/connect pattern on initial connection 
- Added duplicate connection detection in key exchange handler
- When same peer connects through multiple peripherals, keep only one
- Track intentional disconnects to suppress disconnect messages
- Don't show disconnect message when dropping duplicate connections
- This prevents the confusing connect/disconnect/connect pattern

The issue was that both devices try to connect to each other simultaneously,
creating duplicate connections. One gets dropped, but now it's handled gracefully.
2025-07-04 17:05:25 +02:00

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Connection Stability Fixes for BluetoothMeshService

Issues Causing Disconnect/Reconnect

  1. Simultaneous Connection Attempts: Both devices acting as central and peripheral can create duplicate connections
  2. Temporary ID Management: Using peripheral UUIDs as temporary IDs causes confusion
  3. Premature State Updates: Peer list updates happen before connections are fully established
  4. Aggressive Disconnect Handling: Peers are removed immediately on disconnect without grace period

Recommended Fixes

1. Implement Connection Deduplication

  • Track ongoing connection attempts by peer ID
  • Reject duplicate connections from same peer
  • Use deterministic logic to decide which side maintains connection (e.g., compare peer IDs)

2. Improve Peer State Management

  • Add connection states: CONNECTING, CONNECTED, DISCONNECTING
  • Only show "joined" after key exchange AND announce received
  • Add grace period before showing "left" messages (e.g., 5 seconds)

3. Fix Temporary ID Handling

  • Don't add temp IDs to activePeers
  • Only update peer lists after receiving real peer ID
  • Use a separate pendingPeripherals dictionary

4. Consolidate Key Exchange and Announce

  • Send key exchange and announce as atomic operation
  • Wait for both before considering peer "connected"
  • Add sequence numbers to prevent duplicate processing

5. Add Connection Stability Timer

  • Don't show "joined" until connection stable for 1 second
  • Buffer rapid connect/disconnect cycles
  • Implement exponential backoff for reconnection attempts

Implementation Priority

  1. Fix duplicate connection handling (highest impact)
  2. Add connection grace period
  3. Improve state management
  4. Consolidate initialization messages
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