Beginner's Guide to Network UPS Tools (NUT) on a Raspberry Pi

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OH on Raspi - how to restart after having been shut down (by a UPS)? [SOLVED]

I needed a solution for the following scenario: My NAS (QNAP) as well as my OH3-server (Raspberry 4B) are powered by an UPS (uninterruptable power supply, PowerWalker Basic VI 650 SB) to avoid uncontrolled shutdown and data loss when there is a power outage. The NAS is connected via USB to the UPS and will be shutdown after 30 mins of power outage. The NAS serves as Master in a NUT environment and will send a “power failure” message via LAN to the openHAB Raspberry. How te set up the Raspi as…