[Mobile App] Remove Wi-Fi sync (Fast Transfer) feature from iOS/Android app

[aaravgarg]

Parent: #6854 | Hardware: #6855 | Firmware: #6856

Overview

Remove all Wi-Fi sync / "Fast Transfer" code from the Omi mobile app. BLE sync becomes the sole SD card transfer method. This can ship immediately — old devices without Wi-Fi firmware are already unaffected.

Files to DELETE Entirely

File	Lines	Purpose
services/devices/wifi_sync_error.dart	127	Wi-Fi sync error codes, WifiSyncSetupResult, WifiSyncErrorCode enum
services/wifi/wifi_network_service.dart	175	Phone Wi-Fi AP connection management (connect to device AP, disconnect)
services/devices/transports/tcp_transport.dart	196	TCP socket transport for Wi-Fi data transfer (port 12345)
pages/conversations/sync_widgets/wifi_connection_sheet.dart	349	Bottom sheet UI for Wi-Fi connection setup (SSID/password input)
pages/conversations/fast_transfer_settings_page.dart	255	Fast Transfer settings page (accessible from device settings)
pages/conversations/sync_widgets/fast_transfer_suggestion_dialog.dart	108	Dialog suggesting user try Fast Transfer instead of BLE

Total: ~1,210 lines of dead code removed.

Files to MODIFY

services/devices/models.dart

• Remove BLE characteristic UUID for Wi-Fi (line 32):

  // DELETE:
  const String storageWifiCharacteristicUuid = '30295783-4301-eabd-2904-2849adfeae43';

services/devices.dart

• Remove OmiFeatures.wifi flag (line 56):

  // DELETE:
  static const int wifi = 1 << 9;

• Remove Wi-Fi sync in-progress state tracking (lines ~32, 280)

services/devices/device_connection.dart

• Remove all Wi-Fi sync method declarations:
  • isWifiSyncSupported() / performIsWifiSyncSupported()
  • setupWifiSync(ssid, password) / performSetupWifiSync()
  • startWifiSync() / performStartWifiSync()
  • stopWifiSync() / performStopWifiSync()
  • getWifiSyncStatusListener() / performGetWifiSyncStatusListener()
• Remove wifi_sync_error.dart import

services/devices/omi_connection.dart

• Remove Wi-Fi sync method overrides (lines ~810-935):
  • performIsWifiSyncSupported() — checks OmiFeatures.wifi flag
  • performSetupWifiSync() — sends BLE command 0x01 with SSID/password to storageWifiCharacteristicUuid
  • performStartWifiSync() — sends 0x02
  • performStopWifiSync() — sends 0x03
  • performGetWifiSyncStatusListener() — listens on storageWifiCharacteristicUuid for status updates (OFF=0, SHUTDOWN=1, ON=2, CONNECTING=3, CONNECTED=4, TCP_CONNECTED=5)

services/devices/omiglass_connection.dart

• Remove Wi-Fi credential methods for OTA updates (lines ~42-46, 248-278, 392-403):
  • WiFi connection status strings ('Connecting to WiFi...', 'WiFi connected', etc.)
  • setWifiCredentials() method
  • Wi-Fi-based OTA update flow

services/devices/discovery/device_locator.dart

• Remove TransportKind.wifi from enum (line 1)
• Remove DeviceLocator.wifi() factory constructor (lines 9, 26-27)
• Remove wifi case in switch (lines 45-46)

services/wals/wal.dart

• Simplify SyncMethod enum (line 16): remove wifi, keep only ble
• Remove or simplify syncMethod field (line 80)

services/wals/wal_interfaces.dart

• Remove Wi-Fi connection progress listener interface (line 22)

services/wals/sdcard_wal_sync.dart (biggest change)

Remove all Wi-Fi sync logic:

• Remove imports: tcp_transport.dart, wifi_sync_error.dart, wifi_network_service.dart
• Remove _activeTcpTransport field and TCP transport cleanup
• Remove Wi-Fi speed tracking: _wifiSpeedWindowStart, _wifiSpeedWindowBytes, speed calculation methods
• Remove entire Wi-Fi sync flow (~lines 950-1200): credentials setup, Wi-Fi AP connection, TCP server creation, data transfer over TCP, cleanup
• Remove _cleanupWifiSync() helper method
• Remove isWifiSyncSupported() method
• Keep only BLE sync path (the _syncViaBle() flow)

services/wals/wal_syncs.dart

• Remove any Wi-Fi sync method routing

pages/conversations/sync_page.dart

• Remove imports: wifi_connection_sheet.dart, fast_transfer_settings_page.dart, fast_transfer_suggestion_dialog.dart
• Remove BLE/Fast Transfer toggle UI (lines ~375-405)
• Remove Wi-Fi sync color coding (blue=wifi, orange=BLE — lines 234-237, 258)
• Remove FastTransferSuggestionDialog.show() logic (lines ~562-571)
• Remove Wi-Fi error message detection and display (lines ~599-623)
• Simplify: all syncs are BLE, single color, no toggle

pages/settings/device_settings.dart

• Remove Wi-Fi Sync settings tile (lines ~338-343 — the FontAwesomeIcons.wifi tile)
• Remove _isWifiSupported state variable and the isWifiSyncSupported() check on device connect

pages/conversations/wal_item_detail/wal_item_detail_page.dart

• Remove Wi-Fi sync method references

pages/home/firmware_update_dialog.dart & omiglass_ota_update.dart

• Remove any Wi-Fi OTA update paths/references

pages/sdcard/about_sdcard_sync.dart

• Remove any Fast Transfer/Wi-Fi references from help text

pages/home/page.dart

• Remove any Wi-Fi sync state references

providers/sync_provider.dart

• Remove Wi-Fi error message conversion (lines ~299-305)

backend/preferences.dart

• Remove preferred sync method preference (lines 314-317):

  // DELETE:
  String get preferredSyncMethod => ...
  set preferredSyncMethod(String value) => ...

models/sync_state.dart

• Remove any Wi-Fi sync state references

services/connectivity_service.dart

• Line 61: result.contains(ConnectivityResult.wifi) — KEEP THIS. It's checking phone internet connectivity, not Omi Wi-Fi sync. Unrelated.

Localization files (l10n/app_localizations_*.dart)

• Remove Wi-Fi sync translation keys from the base ARB file (app_en.arb):
  • wifiSync, wifiEnableFailed, fast (if Fast Transfer only), and any other Wi-Fi transfer strings
  • Then regenerate all ~50 localization files

Migration / Backward Compatibility

• Stale SharedPreferences: Users who had preferredSyncMethod = 'wifi' stored locally. The app should handle this gracefully:
  • Option A: Ignore the preference entirely (default to BLE always)
  • Option B: Clear it on app upgrade
  • Either way, must not crash if the old value exists
• Old devices: Devices running firmware that still has Wi-Fi BLE characteristics will simply never receive Wi-Fi commands. No impact.
• No data migration needed — Wi-Fi was only a transport, data format is identical regardless of sync method.

Testing Checklist

• App compiles with zero Wi-Fi references (search for "wifi", "WiFi", "wifiSync", "fast_transfer", "TcpTransport" — should find nothing except ConnectivityResult.wifi)
• BLE SD card sync works end-to-end
• Sync page renders correctly (no toggle, no Fast Transfer references)
• Device settings page renders without Wi-Fi tile
• WAL item detail page shows correct sync info
• No crash when old preferredSyncMethod=wifi exists in SharedPreferences
• No crash when connecting to old firmware that exposes Wi-Fi BLE characteristic
• All 50+ localization files compile after key removal
• OTA firmware update works via BLE path
• About SD card sync page renders correctly