Cheers all, I am experimenting with a Raspberry Pi, and it is fed from my PC (Debian-ish Linux) that is in turn protected by an UPS - so runs NUT.
As far as the Pi is concerned, the bigger computer is its wall power source (provides the USB socket) and being a smart machine with NUT running, it could pose as an UPS itself. That is, if the big computer is going to shut down (including probably rebooting, as I expect the motherboard to power-cycle its USB ports), it should issue FSD on some bare-bone driver *AND* wait for clients (like upsmon running on the Pi) to disconnect before proceeding with its own power-off/reboot. Did anyone already solve something like this with a custom driver or smart use of dummy-ups vs. systemd, etc.? Probably not a hard puzzle, but still a fun one - and if someone has already navigated the hidden troubles and can share - so much the better :) Jim Klimov
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