I want to turn on and off a desktop via other PC from 150km away.
I found PiKVM
https://blicube.aliexpress.com/store/1101755276?spm=a2g0o.store_pc_home.1000001.12.5c0050ae6aIIul
I was thinking you could just use a dirt cheap “smart plug” and set the BIOS to turn on after power loss, but I’m not sure it would still turn on after a clean shutdown followed by a power cycle. 
Generally I think the BIOS settings restore last state rather than blindly powering on, but a cheap smart plug might be the best solution for the “off” part.
If you’ve got something else on that network you can probably use Wake-On-LAN to handle the “on” part. You might also be able to reprogram something like a Sonoff smart plug to do both the actual power control and send a Wake-up packet after power on.
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I set the BIOS to turn on after power loss.
I don’t know what happened. I guess I will find out Tuesday.
I need to be able to force power cycle, If the computer hangs.
For now, I think a way to power cycle from another device would be sufficient.
I can set up another computer there and have them recover each other.
The computer is set up using btrfs to auto-boot correctly.
But if errors occur I would need to boot from a previous snapshot.
This would require USB input and HDMI input to the second computer and the second similarly providing USB input and HDMI input to the first.
A simple USB to GPIO is enough to control the ATX buttons. They probably need to be open collector so the existing case button can be used.
The reason I prefer an ATX control is
- A short tap causes a clean shutdown
- A long hold forces power off.