[Nut-upsdev] Liebert ESP II driver

[Arjen de Korte]

Citeren Farkas Levente <lfarkas op lfarkas.org>:

> the truth is that we don't know what's happened. we only recognize if
> nut is running and we just unplug the power from the ups the computer
> shutdown and after 2 minutes the ups turn off itself.
> while if we run liebert's java ups manager service and java gui the
> same thing is not happened.

The java GUI probably switches the UPS from 'autonomous mode' (where  
it decides to switch off the power itself) to the 'monitored mode'  
(where the decision is made by an external program, like the java  
GUI). This is not uncommon. The trick is to find out how to tell the  
UPS that it is being monitored. It could be the java GUI sends an  
initialization command upon startup, or a command to keep running on  
battery when it finds the mains has failed.

Assuming that Liebert isn't willing to tell us how this works, the  
only way to find out what to do is to listen in to the communication  
between java GUI and the UPS and mimic the same behavior. None of the  
active developers currently owns such a UPS, so if this is important  
to you, you'll have to provide us with this information.

Using a serial port sniffer on a native serial port is probably the  
easiest way to go (like 'Portmon for Windows'). I don't recommend to  
use a USB to serial converter with 'usbsnoop' here, since that will  
mean that you'll have to decode both the USB to serial conversion  
*and* the serial communication between the java GUI and the UPS.

Best regards, Arjen
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