bg_ble_scanner

A Flutter plugin for continuous BLE (Bluetooth Low Energy) scanning on Android. It uses a Foreground Service to ensure that the scan keeps running even when the app is in the background or the device screen is locked.

Features

Continuous Background Scanning: Runs as a Foreground Service for high priority.
Screen Lock Support: Scans even when the screen is off (utilizes empty ScanFilters for maximum compatibility).
Real-time Stream: Get results instantly in Flutter through an EventChannel.
Permissions Management: Designed to work with Android 12, 13, and 14+.

Android Setup

Permissions

Add the following permissions to your android/app/src/main/AndroidManifest.xml:

<uses-permission android:name="android.permission.BLUETOOTH_SCAN" android:usesPermissionFlags="neverForLocation" />
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
<uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE_CONNECTED_DEVICE" />
<uses-permission android:name="android.permission.POST_NOTIFICATIONS" />

Usage

Import the package:

import 'package:bg_ble_scanner/bg_ble_scanner.dart';

1. Request Permissions

Use a package like permission_handler to request all required permissions before starting the scan.

2. Listen for Scan Results

final _bgBleScanner = BgBleScanner();

_bgBleScanner.scanResults.listen((device) {
  print("Device found: ${device['name']} - ${device['address']} (${device['rssi']} dBm)");
});

3. Start Scanning

await _bgBleScanner.startScan();

4. Stop Scanning

await _bgBleScanner.stopScan();

Note on Android 13+

Starting from Android 13, users must grant the Notification Permission for the Foreground Service notification to be visible.

License

MIT License.