untested: Avoid duplicate connections to same peer

[callebtc]

Description

Address rotation handled. I added peer-aware gating and robust disconnects so only one direct connection per peer remains active.

What I changed

• Peer-connected checks in the tracker
  • New APIs:
    • isPeerDirectlyConnected(peerID: String): Boolean
    • getConnectedAddressForPeer(peerID: String): String?
  • These use addressPeerMap and connectedDevices to resolve if a peer already has an active link.
• Drop duplicate on first ANNOUNCE
  • In BluetoothMeshService.handleAnnounce:
    • On the FIRST ANNOUNCE for a device connection, before binding deviceAddress -> peerID, it checks if that peerID is already connected via another existingAddress.
    • If found and different, it drops the new, redundant connection via connectionManager.disconnectAddress(deviceAddress).
    • Otherwise it binds the mapping and marks that peer as directly connected (and schedules initial sync). This keeps exactly one connection per peer (client or server).
• Disconnect now handles server connections too
  • BluetoothConnectionManager.disconnectAddress(...):
    • If it’s a client connection, calls gatt.disconnect().
    • If it’s a server connection (no GATT), calls gattServer.cancelConnection(device).
    • Always cleans up tracking afterward.

Why this is robust

• Works with rotating MACs: we can’t know the peer at scan/connection time, but as soon as the peer ANNOUNCE arrives over the new connection, we enforce the one-direct-connection-
  per-peer rule and drop the newcomer.
• Applies across client/server roles. The check uses existing mappings and connected state, and the disconnect path works for either role.
• Keeps backoff correct: We previously fixed the attempt-tracking bug so disconnecting the duplicate doesn’t reset the retry window.

Files changed

• app/src/main/java/com/bitchat/android/mesh/BluetoothConnectionTracker.kt
  • Added isPeerDirectlyConnected and getConnectedAddressForPeer.
• app/src/main/java/com/bitchat/android/mesh/BluetoothMeshService.kt
  • Enforced dropping duplicate connection in ANNOUNCE handling.
• app/src/main/java/com/bitchat/android/mesh/BluetoothConnectionManager.kt
  • Upgraded disconnectAddress to support server connections.