Hello Andrew, thank you for your response. I read the link that you suggest me and I tested the example and it works fine but the problem is that my code is more complicated and there have many differences between my code and the example. I am posting a part of my code here to get maybe a suggestion how to implement charts on my code.

Thanks.

public class BLEConncetViewModel : BindableBase
{
private INavigationService _navigationService;
private IAdapter _btAdapter;
private IDevice _btDevice;

private float _temperature;
private float _humidity;
private float _soil;
private readonly List<int> dSensorList;

private List<DataSensor> _datasensor;

private List<DataSensor> DataSensor

{
get { return _datasensor; }
set
{
_datasensor = value;
RaisePropertyChanged();
}
}

public float Temperature
{
get { return _temperature; }
set { SetProperty(ref _temperature, value); }
}
public float Humidity
{
get { return _humidity; }
set { SetProperty(ref _humidity, value); }

}
public float Soil
{
get { return _soil; }
set { SetProperty(ref _soil, value); }

}

private DataSensor dataSensor;

public ICommand OnClickCommand { get; set; }

private bool _isScanning;

public bool IsScanning
{
get { return _isScanning; }
set { SetProperty(ref _isScanning, value); }
}

private string _statusText;

public string StatusText
{
get { return _statusText; }
set { SetProperty(ref _statusText, value); }
}
public BLEConncetViewModel(INavigationService navigationService, IAdapter btAdapter)
{
_navigationService = navigationService;
_btAdapter = btAdapter;
_btAdapter.DeviceDiscovered += OnDeviceDiscovered;
OnClickCommand = new DelegateCommand(OnClick);
}

private void OnDeviceDiscovered(object sender, DeviceEventArgs e)
{
if (!string.IsNullOrWhiteSpace(e.Device.Name) && e.Device.Name.Contains("GNHC-01S"))
{
_btDevice = e.Device;
NavigationParameters p = new NavigationParameters
{
{ "Device", _btDevice }
};

_navigationService.NavigateAsync(new Uri(nameof(MainMenu), UriKind.Relative), p);
}
}

private async void OnClick()
{
IsScanning = !IsScanning;

if (_isScanning)
{
PermissionStatus status = PermissionStatus.Denied;

if (status != PermissionStatus.Granted)
{
var results = await CrossPermissions.Current.RequestPermissionsAsync(Permission.Location);

//Check that the key exists and if so, assign it to status.
if (results.ContainsKey(Permission.Location))
status = results[Permission.Location];
}
await _btAdapter.StartScanningForDevicesAsync();