Most of the info on this topic is from 2009; I use IPMI on my servers to get Sensor info, but on the mini desktops that doesn't work. I tried to fire up healthd which only reads the voltages, but healthdc returns "connection refused" when trying to retrieve the info. Healthd was around in prehistoric times; what's the newest, best way to do this with generic MBs in Freebsd 12?