I read the whole blog... there is mention of a Perl script and also some expect script code on there, haven't used it seen Perl since 2008 but I guess antique computers have no Python.

Also, having worked with Arduino Nanos and then moved on to ESP32s which have lots of RAM, Wifi and OTA updates, I see a lot of the issues could have been sidestepped. I've built some IR targets that trigger from laser nerf guns and my own IR demodulator from raw electronic components so am a little familiar with IR libraries on Arduino and such myself. Good job at the end - the control loop should work to keep those antique servers at decent temperatures.