Single source of truth for Kotlin Multiplatform migration progress. For the forward-looking roadmap, see [`roadmap.md`](./roadmap.md). For completed decision records, see [`decisions/`](./decisions/).
## Summary
Meshtastic-Android has completed its **Android-first structural KMP migration** across core logic and feature modules, with **full JVM cross-compilation validated in CI**. The desktop target has a working Navigation 3 shell, TCP transport with full mesh handshake, and multiple features wired with real screens.
Modules that share JVM-specific code between Android and desktop now standardize on the `meshtastic.kmp.jvm.android` convention plugin, which creates `jvmAndroidMain` via Kotlin's hierarchy template API instead of manual `dependsOn(...)` source-set wiring.
**19/21** core modules are KMP with JVM targets. The 2 Android-only modules are intentionally platform-specific, with shared contracts already abstracted into `core:ui/commonMain`.
| Android decoupling | **9/10** | No known `java.*` calls in `commonMain`; app module extraction in progress (navigation, connections, background services, and widgets extracted) |
1.**Wire Desktop Features:** Complete desktop UI wiring for `feature:intro` and implement a shared fallback for `feature:map` (which is currently a placeholder on desktop).
2.**Flesh out iOS Actuals:** Complete the actual implementations for iOS UI stubs (e.g., `AboutLibrariesLoader`, `rememberOpenMap`, `SettingsMainScreen`) that were recently added to unblock iOS compilation.
3.**Boot iOS Target:** Set up an initial skeleton Xcode project to start running the now-compiling `iosSimulatorArm64` / `iosArm64` binaries on a real simulator/device.
| Material 3 Adaptive (JetBrains) | ✅ Done | Version `1.3.0-alpha06` aligned with CMP `1.11.0-beta01`; supports Large (1200dp) and Extra-large (1600dp) breakpoints |
| JetBrains lifecycle/nav3 alias alignment | ✅ Done | All forked deps use `jetbrains-*` prefix in version catalog; `core:data` commonMain uses JetBrains lifecycle runtime |
| **Database Parity** | ✅ Done | `DatabaseManager` is pure KMP, giving iOS and Desktop support for multiple connected nodes with LRU caching. On JVM/Desktop, inactive databases are explicitly closed on switch (Room KMP's `setAutoCloseTimeout` is Android-only), and `desktopDataDir()` in `core:database/jvmMain` is the single source for data directory resolution. |
- Both shells utilize the **Navigation 3 Scene-based architecture**, allowing for multi-pane layouts (e.g., three-pane on Large/XL displays) using shared routes.
- Both shells iterate `TopLevelDestination.entries` with shared icon mapping from `core:ui` (`TopLevelDestinationExt.icon`).
- Desktop locale changes now trigger a full subtree recomposition from `Main.kt` without resetting the shared Navigation 3 backstack, so translated labels update in place.
- Firmware remains available as an in-flow route instead of a top-level destination, matching Android information architecture.
- Parity tests exist in `core:navigation/commonTest` (`NavigationParityTest`) and `desktop/test` (`DesktopTopLevelDestinationParityTest`).
- Remaining parity work is documented in [`decisions/navigation3-parity-2026-03.md`](./decisions/navigation3-parity-2026-03.md): serializer registration validation and platform exception tracking.
All major ViewModels have now been extracted to `commonMain` and no longer rely on Android-specific subclasses. Platform-specific dependencies (like `android.net.Uri` or Location permissions) have been successfully isolated behind injected `core:repository` interfaces (e.g., `FileService`, `LocationService`).
**The extraction of all feature-specific navigation graphs, background services, and widgets out of `:app` is complete.** The `:app` module now only serves as the root DI assembler and NavHost container.
- USB/Serial radio connections → `core:network/androidMain`
- TCP radio connections, BLE radio connections (`BleRadioInterface`), and mDNS/NSD Service Discovery → `core:network/commonMain` (with Android `NsdManager` and Desktop `JmDNS` implementations)
**Policy:** Stable by default. RC when it unlocks KMP functionality. Alpha only behind hard abstraction seams. Do not downgrade CMP or Koin — they enable critical KMP features.
> See [`decisions/navigation3-api-alignment-2026-03.md`](./decisions/navigation3-api-alignment-2026-03.md) for the full Navigation 3 API surface audit and Scene architecture adoption plan.
