Network drops (e.g. Wi-Fi -> cellular) and audio-device plug/unplug (wired
headphones, AirPods) used to leave the iOS client in a dead/zombie state:
the engine went silent, no reconnect was attempted, and a live-session
disconnect waited 30-60 s for the C core's TCP keepalive/reaper timeout.
Reconnect (AppState.swift, SessionState.swift):
- Two-layer reconcile. Once SessionState overwrites client.onEvent at auth
success, AppState.handleConnectEvent no longer sees live-session events.
Added a weak SessionState.appState; SessionState.handleEvent .disconnected
calls appState.onLiveSessionDisconnected after the cue -- the single path
AppState learns a live session dropped. Shared teardownLiveSessionAndReconnect
snapshots lastSession, stops audio, releases session/VoiceCatClient (io-
thread join via vc_client_destroy), resets the backoff, and arms
scheduleReconnect (exponential 1s -> 30s cap, indefinite, restored on auth
success via existing TOFU_MATCHED auto-confirm + idempotent join_channel).
- NWPathMonitor now runs WHILE CONNECTED (not only mid-reconnect). On a Wi-Fi
<-> cellular interface change or path .unsatisfied it calls
proactiveReconnect: tearing the session down BEFORE the C core notices the
dead socket collapses the 30-60 s reaper wait into ~1 s + first backoff
tick. Same-interface refreshes (BSSID roams) are ignored via pathSignature.
While mid-reconnect a .satisfied path resets the backoff for a fast retry.
- User-initiated disconnect()/cancelConnect() set userInitiatedDisconnect
and cancel all reconnect state (task + monitor + lastSession + connectedServer).
Audio recovery (AudioSessionManager.swift, IOSVoiceProcessingEngine.swift):
- Intent-gated recoverAudio() replaces the narrow .oldDeviceUnavailable/
.newDeviceAvailable route-change guard; fires on every externally-initiated
route change reason except the ones we cause ourselves (.categoryChange/
.routeConfigurationChange) to avoid a notification loop. Interruption-end
now always recovers instead of only when .shouldResume is set.
- Added AVAudioEngineConfigurationChange observer on the engine so a system
self-stop after our route-change handler wins the race is caught.
- IOSAudioEngine.rebuild() does a one-shot reactivation-retry on
engine.start() failure (iOS sometimes refuses until the session is
re-reactivated -- the silent-death case).
No C ABI / voicecat.h / proto / core changes. Swift-only. iOS sim build green
via scripts/build-ios-client.sh --no-configure (Xcode 26.5 / iOS 18.0 sim).
Talon
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