A while back, we got a shiny new boiler put in our house (for energy efficiency, and because boilers from the 70s are neither cheap to run nor terribly effective). Upon reading the documentation (I'm a hacker. It's what I do), I found that it speaks a semi-standard protocol called eBus.
This is an attempt to listen in on the boiler's comms, over wifi, using a NodeMCU, which is an esp8266 development board programmable in lua.