public static void MakeConnection(BluetoothAddress btAddress)
    {
        var serviceClass = BluetoothService.SerialPort;
        if (_cli != null)
        {
            _cli.Close();
        }

        _cli = new BluetoothClient();
        var bluetoothDeviceInfos = _cli.DiscoverDevices();
        var deviceInfos = bluetoothDeviceInfos.ToList();
        BluetoothDeviceInfo device = null;
        foreach (var bluetoothDeviceInfo in deviceInfos)
        {
            var scannedDeviceAddress = bluetoothDeviceInfo.DeviceAddress;

            if (scannedDeviceAddress == btAddress)
            {
                device = bluetoothDeviceInfo;
            }
        }

        if (device == null)
        {
            return;
        }

        var ep = new BluetoothEndPoint(device.DeviceAddress, serviceClass);

        try
        {
            if (!device.Connected)
            {
                _cli.Connect(ep);
            }
        }
        catch(System.Net.Sockets.SocketException e)
        {
            _cli.Close();
            _isConnected = false;
            return;
        }

        _isConnected = true;
    }