For the last few years I've been using a raspberry pi to interface with my dumb/legacy garage door. The original project I followed is documented here. An extension to it, to bring status into ST is here.
A few changes were required to get this app ported to / working in HE. I forked a version that works with HE here. I'm not sure if the author uses HE but I'll contact him to see about including in the main repo.