Bluetooth package for Bluetooth classic devices in flutter

Question

I have Bluetooth classic device and I have used bluetooth_classic package and succeeded on getting the device in scan.

but I am not able to stop the subscription which I started during scanning process.

and getting this error when I stop the scan and then again starting the scan second time: Stream has already been listened to.

late StreamSubscription<Device> _scanResultsSubscription;
_scanResultsSubscription = _bluetoothClassicPlugin.onDeviceDiscovered().listen(
 (event) {
 _discoveredDevices = [..._discoveredDevices, event];
 },
);

 @override
 void dispose() {
 _scanResultsSubscription.cancel();
 super.dispose();
 }

• Pratik Lakhani: Please share the full code
• Abion47: If you are just restarting the scan, it looks like the Bluetooth plugin is reusing the same stream so you don't need to cancel the stream subscription.
• Anjali Jagtap: @Abion47 Yes in that case I will not need but if I am navigating back (stop the scan ,dispose will call) and again opening the same screen that time this subscription will start again, this time facing the error.
• Anjali Jagtap: @PratikLakhani Future<void> startScan() async { discoveredDevices.clear(); await bluetoothClassicPlugin.startScan(); } Future<void> stopScan() async { discoveredDevices.clear(); await bluetoothClassicPlugin.stopScan(); }
• Abion47: Then you shouldn't be putting the Bluetooth service inside a widget. Put it in an external service class that you can call from any widget.