Can't find devices.

[mthnzbk]

Can't find devices.

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[janusw]

I don't get any error in the code below, but the StartScanningForDevicesAsync() method does not find open bluetooth devices. So Adapter.DeviceDiscovered += async (s, a) => {} I don't get any output in this part. Nor error.

Possibly you're failing to request permissions properly? See https://github.com/dotnet-bluetooth-le/dotnet-bluetooth-le#permissions

You need to add the relevant permissions to your manifest and also request them at runtime.

Which SDK level are you targeting? Do you use Xamarin or MAUI?

[mthnzbk]

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.BLUETOOTH" /> <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /> <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" /> <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" /> <uses-permission android:name="android.permission.BLUETOOTH_SCAN" /> <uses-permission android:name="android.permission.READ_USER_DICTIONARY" /> <uses-permission android:name="android.permission.VIBRATE" /> <uses-permission android:name="android.permission.WRITE_USER_DICTIONARY" /> <uses-sdk android:minSdkVersion="26" android:targetSdkVersion="33" />

`protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
if (ContextCompat.CheckSelfPermission(this, Manifest.Permission.BluetoothScan) != Permission.Granted)
{
ActivityCompat.RequestPermissions(this, new[] {Manifest.Permission.BluetoothScan }, 0);
}

if (ContextCompat.CheckSelfPermission(this, Manifest.Permission.BluetoothAdvertise) != Permission.Granted)
{
    ActivityCompat.RequestPermissions(this, new[] { Manifest.Permission.BluetoothAdvertise }, 0);
}
if (ContextCompat.CheckSelfPermission(this, Manifest.Permission.BluetoothConnect) != Permission.Granted)
{
    ActivityCompat.RequestPermissions(this, new[] { Manifest.Permission.BluetoothConnect }, 0);
}
if (ContextCompat.CheckSelfPermission(this, Manifest.Permission.BluetoothAdmin) != Permission.Granted)
{
    ActivityCompat.RequestPermissions(this, new[] { Manifest.Permission.BluetoothAdmin }, 0);
}

}`

.net 7 Maui

[janusw]

From https://developer.android.com/develop/connectivity/bluetooth/bt-permissions:

If your app uses Bluetooth scan results to derive physical location, declare the ACCESS_FINE_LOCATION permission. Otherwise, you can strongly assert that your app doesn't derive physical location.