Xamarin / MAUI

using Android.App;

using Android.Bluetooth;

using Android.Content;

using Android.OS;

using Android.Runtime;

using Android.Views;

using Android.Widget;

using Java.IO;

using Java.Util;

using System;

using System.Collections.Generic;

using System.Collections.ObjectModel;

using System.Linq;

using System.Text;

using System.Threading;

using System.Threading.Tasks;

using TestXamConnections.Droid.Receivers;

using TestXamConnections.Droid.Utils;

using TestXamConnections.Models;

using TestXamConnections.Services;

namespace TestXamConnections.Droid.Services

{

    public class BluetoothService : IBluetoothService

    {

        private readonly BluetoothAdapter bluetoothAdapter;

        public ObservableCollection<Device> FoundDevices = new ObservableCollection<Device>();

        public BluetoothService()

        {

            FoundDevices = new ObservableCollection<Device>();

            bluetoothAdapter = BluetoothAdapter.DefaultAdapter;

        }

        public ICollection<Device> GetBondedDevices()

        {

            ICollection<Device> ret = new ObservableCollection<Device>();

            foreach (BluetoothDevice bondedDevice in bluetoothAdapter.BondedDevices)

            {

                Device toAddItem = new Device

                {

                    MACAddress = bondedDevice.Address,

                    Name = bondedDevice.Name

                };

                ret.Add(toAddItem);

            }

            return ret;

        }

    }

}