protected override void OnResume()
{
SensorDataAccess dataAccess = new SensorDataAccess();
dataAccess.sensors = sensors;
dataAccess.GetSensors(Settings.LoginToken);
}
protected void OnRemoveSensor(object sender, EventArgs args)
{
SensorDataAccess dataAccess = new SensorDataAccess();
dataAccess.DeleteSensor(this.selectedSensor);
Navigation.PopToRootAsync();
}