How the door gets unlocked.
HW is an ESP32 in nodemcu(ish) form factor running micropython with a relay shield (or hat, or cape, or whatever they're actually called in this form factor).
Code for the ESP32 is in micropython/ dir.
Needs something to send ping messages periodically or it'll reset itself.
monitor_doorbot.py sends ping messages and does some reporting to irccat.
There are example_secrets.py files for monitor_doorbot.py and the micropython that need values filled in and moved to be secrets.py for them to work.