public void Dispose()
{
//should dispose of SD and Char display (at least!)
#if ORGPAL_THREE
palthreeDisplay.Dispose();
palAdcExpBoard.Dispose();
palthreeInternalAdc.Dispose();
palthreeButtons.Dispose();
#endif
//System.IO.FileStream -- Dispose??
sendTelemetryTimer.Dispose();
sendShadowTimer.Dispose();
AwsIotCore.MqttConnector.Client.Close();
AwsIotCore.MqttConnector.Client.Dispose();
Sntp.Stop();
_logger = null;
}