Hello Marc, It appears that you are a step further then I am. I have an EG-UPS-034, so that should be the same firmware. However, I am not able to connect to the device. Can you share your ups.conf? I noticed that in the Debug Log of the packaged software, I can see what it is sent. And in the event log you can see what is done, so I could link the test shutdown command in the event log to the debug log. I would like to see if this is aligned. Somewhere I read that it should be possible to put a hardware sniffer in between, but I do not know if that is required. Maybe together we can unravel this. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://alioth-lists.debian.net/pipermail/nut-upsuser/attachments/20231120/66f1bd57/attachment.htm>