Xamarin / MAUI

using Android.App;

using Android.Bluetooth;

using Android.Content;

using Android.OS;

using Android.Runtime;

using Android.Views;

using Android.Widget;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace TestBLE.Droid.Receivers

{

    public class BluetoothReceiver : BroadcastReceiver

    {

        public EventHandler<BluetoothDevice> OnBluetoothDeviceDiscovered;

        public EventHandler<string> OnScanFinished;

        public override void OnReceive(Context context, Intent intent)

        {

            if (intent.Action.Equals(BluetoothDevice.ActionFound))

            {

                BluetoothDevice foundDevice = intent.GetParcelableExtra(BluetoothDevice.ExtraDevice) as BluetoothDevice;

                if (foundDevice != null)

                {

                    var btDevice = new Models.BTDevice

                    {

                        MACAddress = foundDevice.Address,

                        Name = foundDevice.Name

                    };

                }

                OnBluetoothDeviceDiscovered.Invoke(this, foundDevice);

            } else if (intent.Action.Equals(BluetoothAdapter.ActionDiscoveryFinished)) 

            {

                OnScanFinished.Invoke(this, "Finished");

            }

        }

    }

}