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PublishedJuly 11, 2026 at 12:54 AM

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version: "1.0.1"

Skill: Project Overview & Codebase Map

Description

Module directory, namespacing conventions, environment setup, and troubleshooting for Meshtastic-Android.

Build System: Gradle (Kotlin DSL). JDK 25 REQUIRED. Target SDK: API 36. Min SDK: API 26.
Flavors: fdroid (OSS only) · google (Maps + DataDog analytics)
Android-only Modules: core:barcode (CameraX), feature:widget (Glance home-screen widget), feature:car (Android Auto via the Car App Library, google flavor only), and baselineprofile (Macrobenchmark). Shared contracts are abstracted into core:ui/commonMain.

Codebase Map

Directory	Description
`androidApp/`	Main application module. Contains `MainActivity`, Koin DI modules, and app-level logic. Uses package `org.meshtastic.app`.
`build-logic/`	Convention plugins for shared build configuration (e.g., `meshtastic.kmp.feature`, `meshtastic.kmp.library`, `meshtastic.kmp.jvm.android`, `meshtastic.koin`).
`config/`	Detekt static analysis rules (`config/detekt/detekt.yml`) and Spotless formatting config (`config/spotless/.editorconfig`).
`docs/`	Architecture docs and agent playbooks. See `docs/kmp-status.md` and `docs/roadmap.md` for current status.
`core/model`	Domain models and common data structures.
`core:common`	Low-level utilities, I/O abstractions (Okio), and common types.
`core:database`	Room KMP database implementation.
`core:datastore`	Multiplatform DataStore for preferences.
`core:repository`	High-level domain interfaces (e.g., `NodeRepository`, `LocationRepository`).
`core:domain`	Pure KMP business logic and UseCases.
`core:data`	Core manager implementations and data orchestration.
`core:network`	KMP networking layer using Ktor, MQTT abstractions, and shared transport (`StreamFrameCodec`, `TcpTransport`, `SerialTransport`, `BleRadioInterface`).
`core:di`	Common DI qualifiers and dispatchers.
`core:navigation`	Shared navigation keys/routes for Navigation 3 using `@Serializable sealed interface` hierarchies. `DeepLinkRouter` for typed backstack synthesis, and `MeshtasticNavSavedStateConfig` with `subclassesOfSealed()` for automatic polymorphic backstack persistence.
`core:ui`	Shared Compose UI components (`MeshtasticAppShell`, `MeshtasticNavDisplay`, `MeshtasticNavigationSuite`, `AlertHost`, `SharedDialogs`, `PlaceholderScreen`, `MainAppBar`, dialogs, preferences) and platform abstractions.
`core:service`	KMP service layer; Android bindings stay in `androidMain`.
`core:takserver`	Meshtastic ↔ TAK (ATAK/iTAK) bridge — local CoT server and CoT ⇄ mesh conversion.
`core:prefs`	KMP preferences layer built on DataStore abstractions.
`core:barcode`	Barcode scanning (Android-only).
`core:nfc`	NFC abstractions (KMP). Android NFC hardware implementation in `androidMain`.
`core/ble/`	Bluetooth Low Energy stack using Kable.
`core/resources/`	Centralized string and image resources (Compose Multiplatform).
`core/testing/`	Shared test doubles, fakes, and utilities for `commonTest` across all KMP modules.
`feature/`	Feature modules (e.g., `settings`, `map`, `messaging`, `node`, `intro`, `connections`, `firmware`, `wifi-provision`, `discovery`, `docs`, `widget`, `car`). Most are KMP and use the `meshtastic.kmp.feature` convention plugin; `widget` (Glance) and `car` (Android Auto, `google` flavor only) are Android-only.
`baselineprofile/`	Macrobenchmark Baseline Profile generation for `:androidApp` (AOT-compiled cold-start journey). Android-only.
`feature/wifi-provision`	KMP WiFi provisioning via BLE (Nymea protocol). Uses `core:ble` Kable abstractions.
`feature/firmware`	Fully KMP firmware update system: Unified OTA (BLE + WiFi), native Nordic Secure DFU protocol (pure KMP), USB/UF2 updates, and `FirmwareRetriever` with manifest-based resolution. Desktop is a first-class target.
`desktopApp/`	Compose Desktop application. Thin host shell relying on feature modules for shared UI. Full Koin DI graph, TCP, Serial/USB, and BLE transports. Versioning via `config.properties` + `GitVersionValueSource`.

Namespacing

Standard: Use the org.meshtastic.* namespace for all code.
Legacy: Maintain the com.geeksville.mesh Application ID.

Environment Setup

JDK 25 MUST be used to prevent Gradle sync/build failures.
Secrets: Copy secrets.defaults.properties to local.properties:

``properties MAPS_API_KEY=dummy_key datadogApplicationId=dummy_id datadogClientToken=dummy_token ``

Workspace Bootstrap (MUST run before any build)

Agents MUST perform these steps automatically at the start of every session before running any Gradle task. Do not wait for the user to tell you.

Android SDK: ANDROID_HOME may not be set in agent workspaces. Detect and export it:

``bash # Check common macOS/Linux locations in order of preference if [ -z "$ANDROID_HOME" ]; then for dir in "$HOME/Library/Android/sdk" "$HOME/Android/Sdk" "/opt/android-sdk"; do if [ -d "$dir" ]; then export ANDROID_HOME="$dir"; break; fi done fi ` All ./gradlew invocations must include ANDROID_HOME` in the environment. If the SDK cannot be found, ask the user for the path.

Init secrets: If local.properties does not exist, copy secrets.defaults.properties to local.properties. Without this the google flavor build fails:

``bash [ -f local.properties ] || cp secrets.defaults.properties local.properties ``

Troubleshooting

Build Failures: Check gradle/libs.versions.toml for dependency conflicts.
Configuration Cache: Add --no-configuration-cache if cache-related issues persist.
Koin Injection Failures: Verify the component is included in AppKoinModule.

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