Control Bluetooth in .NET MAUI for Android & Windows

Android
Set Bluetooth permissions in the AndroidManifest.xml file. Enable the location permission on the Android device.

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<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_SCAN" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> // Required for Bluetooth scanning

Use the InTheHand.Bluetooth.Permissions package to check permissions with the code var state = await Permissions.RequestAsync<InTheHand.Bluetooth.Permissions.Bluetooth>();.
Check if Bluetooth is enabled.

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#if ANDROID
var bluetoothManager = (Android.Bluetooth.BluetoothManager)Android.App.Application.Context.GetSystemService(Android.Content.Context.BluetoothService);
if (bluetoothManager != null)
{
    var bluetoothAdapter = bluetoothManager.Adapter;
    if (bluetoothAdapter != null && bluetoothAdapter.IsEnabled == false)
    {
        bluetoothAdapter.Enable();
        //var enable = new Android.Content.Intent(Android.Bluetooth.BluetoothAdapter.ActionRequestEnable);
        //enable.SetFlags(Android.Content.ActivityFlags.NewTask);
        //Android.App.Application.Context.StartActivity(enable);
    }
}
#endif

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#if ANDROID
var bluetoothManager = (Android.Bluetooth.BluetoothManager)Android.App.Application.Context.GetSystemService(Android.Content.Context.BluetoothService);
var bluetoothAdapter = bluetoothManager.Adapter;
if (bluetoothAdapter.IsEnabled == true)
{
    bluetoothAdapter.Disable();
}
else
{
    bluetoothAdapter.Enable();
}
#endif

You can use the following code after requesting the permission, and it works on all Android versions:

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#if ANDROID
var enable = new Android.Content.Intent(
            Android.Bluetooth.BluetoothAdapter.ActionRequestEnable);
enable.SetFlags(Android.Content.ActivityFlags.NewTask);

var disable = new Android.Content.Intent(
            Android.Bluetooth.BluetoothAdapter.ActionRequestDiscoverable);
disable.SetFlags(Android.Content.ActivityFlags.NewTask);

var bluetoothManager = (Android.Bluetooth.BluetoothManager)Android.App.Application.Context.GetSystemService(Android.Content.Context.BluetoothService);
var bluetoothAdapter = bluetoothManager.Adapter;
if (bluetoothAdapter.IsEnabled == true)
{
    Android.App.Application.Context.StartActivity(disable);
    // disable the bluetooth
}
else
{
    // enable the bluetooth
    Android.App.Application.Context.StartActivity(enable);
}
#endif

Windows