How to check sensor is live ?

/*
  This code is running one time when program is enabled
*/
public void Setup()
{
  //System.Threading.Thread.Sleep(100);
  //Thread.Sleep(100);
}

/*
  This code is running periodicaly when program is enabled. 
  Cron job detirmine running period.
*/
public void Run()
{
  EmailHelper.SetupSmtp("xxxxx@gmail.com", "password", "smtp.gmail.com", 587, true);
  
  String outTxt = "";
  
  foreach (Module m in Modules.Instance.ModuleList)
  {
    // we do not check those modules
    if (
      	m.Domain == "RPiGPIO" ||
      	m.Domain == "Virtual" || 
      	m.Domain == "Esp8266" && m.Address == "N1S10" ||
        m.Domain == "Esp8266" && m.Address == "N1S11" ||
        m.Domain == "Esp8266" && m.Address == "N1S12" ||
        m.Domain == "Esp8266" && m.Address == "N1S13" ||
        m.Domain == "Esp8266" && m.Address == "N1S14" ||
        m.Domain == "Esp8266" && m.Address == "N1S15" ||
        m.Domain == "Esp8266" && m.Address == "N1S16" ||
        m.Domain == "Esp8266" && m.Address == "N1S6" ||
        m.Domain == "Esp8266" && m.Address == "N1S7" ||
        m.Domain == "Esp8266" && m.Address == "N1S8" ||
        m.Domain == "Esp8266" && m.Address == "N1S9" ||
        m.Domain == "Virtual" && m.Address == "N1S0"              
       )
      continue;
    
    
    bool connectionOk = false;

    foreach (ModuleParameter p in m.Properties)
    {
      // if not settings and Status.Connection
      if (p.Name.IndexOf("Settings.") == -1 && m.Domain != "Esp8266")
      {
        if ((DateTime.UtcNow - p.UpdateTime).TotalHours <= 27)
        {
          connectionOk = true;
          break;
        }
      }
      else if (p.Name == "Status.Connection" && p.Value == "1")
      {
          connectionOk = true;
          break;
      }
    }
    
    if (!connectionOk)
      outTxt += "Module not connected: "+ m.Domain + " "+ m.Address + ":"+m.Description + "\n\r";
      
  }
  
  if (outTxt != "")
    EmailHelper.SendEmail("xxx@gmail.com", "xxxx@gmail.com", "[EasyIoT server] Module connection status alert", outTxt);
}