I’m using a Rpi Zero W in my garage to operate the door and a few other things. I will post a new thread on that in detail when it’s all done and working.
I couldn’t get the gpio working with homegenie. What I discovered in a search is kernel 4.9 with this terminal command /proc/cpuinfo shows BCM2835 for the hardware interface. It should be BCM2709 for pi zero. I suspect from my search that 4.8 does this as well but I haven’t tested.
I fixed the problem by downgrading to 4.4.38 /proc/cpuinfo now shows BCM2709 and the GPIO works!