[Help]: OnDone method in scanResults is not called ;

[thapliyal-lifespark]

Requirements

• I've looked at the README 'Common Problems' section

Have you checked this problem on the example app?

Yes

FlutterBluePlus Version

1.20.7

Flutter Version

3.13.5

What OS?

Android

OS Version

12

Bluetooth Module

Esp32

What is your problem?

The on done method in the scanResults stream is not called ;

`Future startDiscovery(Function onConnect) async {
try {
// ignore: unused_local_variable
StreamSubscription<List>? scanSubscription;
await askForPermission();
_scannedDevices.clear();

  isConnecting =
      false; ////Reset the connecting flag so that when the scan results come up they can be connected to if needed

  isScanning = true;
  notifyListeners();
  BluetoothDevice scannedDevice;

  scanSubscription = FlutterBluePlus.scanResults.listen(
    (event) async {
      log("Scan Result is $event ");
      if (event.isNotEmpty) {
        scannedDevice = event.elementAt(0).device;
        FlutterBluePlus.stopScan();
        scanSubscription!.cancel();
        await connectToDevice(scannedDevice, onConnect);
      }
    },
    onDone: () {
      log("Scanning Done");
      isScanning = false;
      scanSubscription!.cancel();
      notifyListeners();
    },
  );

  await FlutterBluePlus.startScan(
    timeout: const Duration(seconds: 10),
    withServices: [Guid("0000acf0-0000-1000-8000-00805f9b34fb")],
  );
} catch (e) {
  log("Error in startDiscovery $e");
}

}`

Logs

Restarted application in 3,093ms.
[log] Running Main.dart
I/ViewRootImpl@a01c353[MainActivity]( 7682): Relayout returned: old=(0,0,1440,2960) new=(0,0,1440,2960) req=(1440,2960)0 dur=34 res=0x1 s={true 514749337600} ch=false
I/ViewRootImpl@a01c353[MainActivity]( 7682): MSG_RESIZED: frame=(0,0,1440,2960) ci=(0,84,0,168) vi=(0,84,0,0) or=1
[log] userToken is
D/[FBP-Android]( 7682): [FBP] onMethodCall: flutterHotRestart
2
D/BluetoothAdapter( 7682): STATE_ON
D/BluetoothLeScanner( 7682): could not find callback wrapper
D/[FBP-Android]( 7682): [FBP] disconnectAllDevices(flutterHotRestart)
D/[FBP-Android]( 7682): [FBP] connectedPeripherals: 0
I/flutter ( 7682): [FBP] <setLogLevel> args: 5
D/[FBP-Android]( 7682): [FBP] onMethodCall: setLogLevel
I/flutter ( 7682): [FBP] <setLogLevel> result: true
I/ViewRootImpl@a01c353[MainActivity]( 7682): Relayout returned: old=(0,0,1440,2960) new=(0,0,1440,2960) req=(1440,2960)0 dur=18 res=0x1 s={true 514749337600} ch=false
I/ViewRootImpl@a01c353[MainActivity]( 7682): Relayout returned: old=(0,0,1440,2960) new=(0,0,1440,2960) req=(1440,2960)0 dur=23 res=0x1 s={true 514749337600} ch=false
I/ViewRootImpl@a01c353[MainActivity]( 7682): MSG_RESIZED: frame=(0,0,1440,2960) ci=(0,84,0,168) vi=(0,84,0,168) or=1
I/ViewRootImpl@a01c353[MainActivity]( 7682): ViewPostIme pointer 0
I/ViewRootImpl@a01c353[MainActivity]( 7682): ViewPostIme pointer 1
I/flutter ( 7682): [FBP] <getSystemDevices> args: null
D/[FBP-Android]( 7682): [FBP] onMethodCall: getSystemDevices
I/flutter ( 7682): [FBP] <getSystemDevices> result: {devices: []}
[log] connected devices []
[log] to ScanNConnect Page
I/ViewRootImpl@a01c353[MainActivity]( 7682): ViewPostIme pointer 0
I/ViewRootImpl@a01c353[MainActivity]( 7682): ViewPostIme pointer 1
[log] Checking the Adapter state
I/flutter ( 7682): [FBP] <getAdapterState> args: null
D/[FBP-Android]( 7682): [FBP] onMethodCall: getAdapterState
I/flutter ( 7682): [FBP] <getAdapterState> result: {adapter_state: 4}
[log] Scan Result is []
I/flutter ( 7682): [FBP] <startScan> args: {service_uuids: [0000acf0-0000-1000-8000-00805f9b34fb], mac_addresses: [], allow_duplicates: true, android_scan_mode: 2, android_uses_fine_location: false}
D/[FBP-Android]( 7682): [FBP] onMethodCall: startScan
D/BluetoothAdapter( 7682): STATE_ON
I/chatty  ( 7682): uid=11096(com.lifesparktech.walk) identical 1 line
D/BluetoothAdapter( 7682): STATE_ON
D/BluetoothLeScanner( 7682): Start Scan with callback
D/BluetoothLeScanner( 7682): onScannerRegistered() - status=0 scannerId=15 mScannerId=0
I/flutter ( 7682): [FBP] <startScan> result: true
I/flutter ( 7682): [FBP] <stopScan> args: null
D/[FBP-Android]( 7682): [FBP] onMethodCall: stopScan
2
D/BluetoothAdapter( 7682): STATE_ON
D/BluetoothLeScanner( 7682): Stop Scan with callback
I/flutter ( 7682): [FBP] <stopScan> result: true

[chipweinberger]

correct

this is by design

use isScanning if you want to be informed when it is done

[chipweinberger]

or use your own timeout with stopScan