Add dry contact support

[jdberry]

I have a door opener by Overhead Door, so I need support for the dry contact switches. I'm hoping that can be enabled on this project soon.

[dkerr64]

@jgstroud what do we need to do to implement this?

[seeginator]

Would also love to see this. Feature matrix for HomeKit firmware shows "+ - implementation is possible" for dry contact, but doesn't appear to be a Door Protocol option when configuring.

[jgstroud]

Implementation is definitely possible. I think the firmware side is fairly trivial to implement here, but the wiring is a little more challenging. Take a look at the main ratgdo wiring page. Neither David nor I have a door that requires this. We could implement it, but won't really be able to test it at all.

[jdberry]

I'd love to see this happen and would be happy to test. The wiring is pretty simple.

[PaulWieland]

Testing is no problem.

[sullivankyle]

I'm setting up my door now--dry contact and HomeKit preferred as I don't have another platform set up at my house. I understand I may have to set up something besides HomeKit to make this work, but prefer not to at this point.

If I wire for dry contact and add the reed switches for the limit switches, will HomeKit be able to control anything at all?

(Have not added reed limit switches yet) I was able to add the ratgdo to HomeKit and I see it, and it logs actions, but does not control the door at all.

Thoughts?

Screenshot of iOS home app garage controls:

[jgstroud]

HomeKit firmware does not yet have support for dry contacts. It should be pretty easy to add but no one has taken on the task yet. It's the one remaining major missing feature.

[sullivankyle]

Yea that's what I understood the more or less by instructions and this thread. Sounds like even though I see the gdo in apple home, no matter what i do with wiring, the app won't be able to get the garage door to do anything.

We shall see what comes first--one of the programmers here adds in the code to support homekit on dry contacts, or me buying the homeassistant computer thing or raspberry pi!

[jgstroud]

Correct. At this point even if you wire it all up, it won't do anything. It's really not much code to write. I would just do it but I've been extremely tied up over the last 4 months or so. If I have some time I'll look at it. Would be nice to close this gap. We also accept pull requests if you want to write it yourself.

[tlhagan]

I am in the same boat, I have an Overhead Door that requires dry contact wiring and would prefer to use HomeKit directly. Looking forward to this being implemented. The code would probably be over my head but would be happy to help test.

[seeginator]

Same. I actually have it all wired up for dry contact, and MQTT, but that proved to be fairly unstable for me with XCEL regularly shutting off power after the Marshall Fire a couple of years ago. I’d be happy to test out anything, but the coding is probably beyond me.

[flsfx]

Adding my $.02 to the comments above, the Genie DO I have will need dry contact support to use HomeKit directly.
The ratgdo is wired in but not appearing on Apple Home - I'm still working on that.