Thanks for trying to test! Does the binding appear in the list of bindings in Openhab? There might be some missing dependencies 🙁 Can you check openhab.log and look for an entry around opengarage?
IIRC (from when I was trying to get this working) I had to install a newer version of gson (this is as the binding is built against the openhab 2.5 code).
Or download the gson jar and drop it in the addons folder.
Hopefully that will get the binding to show up. Then it should be as easy as adding a Thing (manually specifying the IP) as Autodiscover doesn’t work yet