James Rich
650979d6dd
Root-caused via KT-80409 (open JetBrains bug): com.android.kotlin.multiplatform.library
(applied by this repo's KmpLibraryConventionPlugin) silently fails to attach androidMain
to a custom hierarchy group via the withAndroidTarget() named helper -- androidMain stays
wired directly to commonMain instead. A KGP engineer's own workaround is to drop to the
lower-level withCompilations predicate, which this reverts to (the form already proven to
work for android/jvm in an earlier pass, before this file was changed to the broken
withAndroidTarget()/withApple() form).
That predicate alone only reaches the two leaf iOS compilations, not the shared iosMain
intermediate the default hierarchy template already creates (where NoopStubs.kt's actuals
live) -- confirmed via a printSourceSetHierarchy dump showing iosMain dependsOn [appleMain]
only, no edge to nonWebMain. Added an explicit sourceSets.getByName("iosMain") { dependsOn
(nonWebMain) } edge for this, the same "drop to a lower-level explicit construct" pattern
as the Android workaround.
Verification of this exact fix is pending -- committing immediately (before any further
verification) after a subagent silently discarded the previous, unverified attempt at this
same fix via an unreviewed git checkout/restore, with zero trace in reflog or stash.
:core:ble
Overview
The :core:ble module contains the foundation for Bluetooth Low Energy (BLE) communication in the Meshtastic Android app. It uses the Kable multiplatform BLE library to provide a unified, Coroutine-based architecture across all supported targets (Android, Desktop, and future iOS).
This module abstracts platform-specific BLE operations behind common Kotlin interfaces (BleDevice, BleScanner, BleConnection, BleConnectionFactory), ensuring that business logic in commonMain remains platform-agnostic and testable.
Key Components
1. BleConnection
A robust wrapper around Kable's Peripheral that simplifies the connection lifecycle and service discovery using modern Coroutine APIs.
- Features:
- Connection & Await: Provides suspend functions to connect and wait for a terminal state (Connected or Disconnected).
- Unified Profile Helper: A
profilefunction that manages service discovery, characteristic setup, and lifecycle in a single block, with automatic timeout and error handling. - Observability: Exposes
connectionStateas a Flow for reactive UI and service updates. - Platform Setup: Seamlessly handles platform-specific configuration (like MTU negotiation on Android or direct connections on Desktop) via
platformConfig()extensions.
2. BluetoothRepository
A Singleton repository responsible for the global state of Bluetooth on the device.
- Features:
- State Management: Exposes a
StateFlow<BluetoothState>reflecting whether Bluetooth is enabled, permissions are granted, and which devices are bonded. - Permission Handling: Centralizes logic for checking Bluetooth and Location permissions across different platforms.
- Bonding: Simplifies the process of creating and validating bonds with peripherals.
- State Management: Exposes a
3. BleScanner
A wrapper around Kable's Scanner to provide a consistent and easy-to-use API for BLE scanning with built-in peripheral mapping.
4. BleRetry
A utility for executing BLE operations with retry logic, essential for handling the inherent unreliability of wireless communication.
Integration
The :core:ble module is used by BleRadioTransport in :core:network to implement the RadioTransport contract for Bluetooth devices.
Usage
Dependencies are managed via the version catalog (libs.versions.toml).
[versions]
kable = "0.44.2"
[libraries]
kable-core = { module = "com.juul.kable:kable-core", version.ref = "kable" }
Architecture
The module follows a clean multiplatform architecture approach:
- Repository Pattern:
BluetoothRepositorymediates data access. - Coroutines & Flow: All asynchronous operations use Kotlin Coroutines and Flows.
- Dependency Injection: Koin is used for dependency injection.
Testing
The module includes unit tests for key components, utilizing Kable's architecture and standard coroutine testing tools to ensure logic correctness.
Dependency Graph
graph TB
:core:ble[ble]:::kmp-library
:core:ble --> :core:common
:core:ble -.-> :core:di
:core:ble -.-> :core:model
:core:ble -.-> :core:testing
classDef android-application fill:#CAFFBF,stroke:#000,stroke-width:2px,color:#000;
classDef android-application-compose fill:#CAFFBF,stroke:#000,stroke-width:2px,color:#000;
classDef compose-desktop-application fill:#CAFFBF,stroke:#000,stroke-width:2px,color:#000;
classDef android-feature fill:#FFD6A5,stroke:#000,stroke-width:2px,color:#000;
classDef android-library fill:#9BF6FF,stroke:#000,stroke-width:2px,color:#000;
classDef android-library-compose fill:#9BF6FF,stroke:#000,stroke-width:2px,color:#000;
classDef android-test fill:#A0C4FF,stroke:#000,stroke-width:2px,color:#000;
classDef jvm-library fill:#BDB2FF,stroke:#000,stroke-width:2px,color:#000;
classDef kmp-feature fill:#FFD6A5,stroke:#000,stroke-width:2px,color:#000;
classDef kmp-library-compose fill:#FFC1CC,stroke:#000,stroke-width:2px,color:#000;
classDef kmp-library fill:#FFC1CC,stroke:#000,stroke-width:2px,color:#000;
classDef unknown fill:#FFADAD,stroke:#000,stroke-width:2px,color:#000;