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82 lines
3.7 KiB
Markdown
82 lines
3.7 KiB
Markdown
# `:core:ble`
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## Module dependency graph
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<!--region graph-->
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```mermaid
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graph TB
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:core:ble[ble]:::kmp-library
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classDef android-application fill:#CAFFBF,stroke:#000,stroke-width:2px,color:#000;
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classDef android-application-compose fill:#CAFFBF,stroke:#000,stroke-width:2px,color:#000;
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classDef android-feature fill:#FFD6A5,stroke:#000,stroke-width:2px,color:#000;
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classDef android-library fill:#9BF6FF,stroke:#000,stroke-width:2px,color:#000;
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classDef android-library-compose fill:#9BF6FF,stroke:#000,stroke-width:2px,color:#000;
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classDef android-test fill:#A0C4FF,stroke:#000,stroke-width:2px,color:#000;
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classDef jvm-library fill:#BDB2FF,stroke:#000,stroke-width:2px,color:#000;
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classDef kmp-library fill:#FFC1CC,stroke:#000,stroke-width:2px,color:#000;
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classDef unknown fill:#FFADAD,stroke:#000,stroke-width:2px,color:#000;
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```
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<!--endregion-->
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## Overview
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The `:core:ble` module contains the foundation for Bluetooth Low Energy (BLE) communication in the Meshtastic Android app. It has been modernized to use **Nordic Semiconductor's Android Common Libraries** and **Kotlin BLE Library**.
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This modernization replaces legacy callback-based implementations with robust, Coroutine-based architecture, ensuring better stability, maintainability, and standard compliance.
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## Key Components
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### 1. `BleConnection`
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A robust wrapper around Nordic's `Peripheral` and `CentralManager` that simplifies the connection lifecycle and service discovery using modern Coroutine APIs.
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- **Features:**
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- **Connection & Await:** Provides suspend functions to connect and wait for a terminal state (Connected or Disconnected).
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- **Unified Profile Helper:** A `profile` function that manages service discovery, characteristic setup, and lifecycle in a single block, with automatic timeout and error handling.
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- **Observability:** Exposes `peripheralFlow` and `connectionState` as Flows for reactive UI and service updates.
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- **Connection Management:** Handles PHY updates, MTU logging, and connection priority requests automatically.
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### 2. `BluetoothRepository`
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A Singleton repository responsible for the global state of Bluetooth on the Android device.
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- **Features:**
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- **State Management:** Exposes a `StateFlow<BluetoothState>` reflecting whether Bluetooth is enabled, permissions are granted, and which devices are bonded.
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- **Permission Handling:** Centralizes logic for checking Bluetooth and Location permissions across different Android versions.
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- **Bonding:** Simplifies the process of creating bonds with peripherals.
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### 3. `BleScanner`
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A wrapper around Nordic's `CentralManager` scanning capabilities to provide a consistent and easy-to-use API for BLE scanning with built-in peripheral deduplication.
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### 4. `BleRetry`
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A utility for executing BLE operations with retry logic, essential for handling the inherent unreliability of wireless communication.
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## Integration in `app`
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The `:core:ble` module is used by `NordicBleInterface` in the main application module to implement the `IRadioInterface` for Bluetooth devices.
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## Usage
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Dependencies are managed via the version catalog (`libs.versions.toml`).
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```toml
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[versions]
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nordic-ble = "2.0.0-alpha15"
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nordic-common = "2.8.2"
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[libraries]
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nordic-client-android = { module = "no.nordicsemi.kotlin.ble:client-android", version.ref = "nordic-ble" }
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# ... other nordic dependencies
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```
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## Architecture
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The module follows a clean architecture approach:
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- **Repository Pattern:** `BluetoothRepository` mediates data access.
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- **Coroutines & Flow:** All asynchronous operations use Kotlin Coroutines and Flows.
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- **Dependency Injection:** Koin is used for dependency injection.
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## Testing
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The module includes unit tests for key components, mocking the underlying Nordic libraries to ensure logic correctness without requiring a physical device.
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