I've been trying to find a way to control my garage door via Hubitat for a while. I have a Chamberlain opener that uses one of the "smart" wall switches that has two wires but a number of functions. After a bunch of research I learned that it is nearly impossible to "spoof" the GDO into thinking anything else is the the provided wall mount controls without an advanced electrical engineering degree.
I found a post elsewhere that described how to get it done in an innovative way. I purchased the Zooz MultiRelay and a $25 remote clicker from Home Depot that works with my garage door opener. I programmed the remote to open and close the door. I then opened the remote and soldered a pair of wires to the switch and connected the other end to the relay. When you activate the relay it closes the switch on the remote and the door opens. Magic!! No modifications to the opener itself at all. Easy as pie! I have two doors and got a two door opener and used the first two relays in the Zooz Multirelay and have one i still can use. No drivers, no special code,