old_contents: #Detect device status, if errors, reboot by watchdog.
  #Send on-line message to gateway while bootup, if gateway receive plenty of 
  #on-line messages in a short time from the same device, an alarm occurs.
  
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new_contents: #Detect device status, if errors, reboot by watchdog.
  #Send on-line message to gateway while bootup, if gateway receive plenty of 
  #on-line messages in a short time from the same device, an alarm occurs.
  
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  2
  3
  
subject: Update watchdog.py