Is there an off the shelf Zigbee solution yet for taking in dry contact input and treating it as a configurable sensor type (motion, binary, etc)?
The equivalent to (part of) the functionality of the Zen17.
Not needing any actual output, just a few dry contact inputs that are treated as sensors.
There are “smart implant” devices with a few GPIO, but I’ve only seen Z-Wave versions, or made my own with an ESP + Tasmota / ESPhome.
For Zigbee, I’ve instead used a simple magnetic door sensor and added connections across the magnetic reed switch - simple, cheap, and gives “dry contact” input. I’ve not seen a device with a more modern Hall-Effect sensor that would be more difficult to adapt.
For some applications, I’ve even managed to get a device relay coil to directly trigger a magnetic reed switch by careful positioning.
If this helps, 
this post!
Same here. Been looking for them for a while, there was one I found but not sure if it was ever released.
https://www.develcoproducts.com/products/smart-relays/io-module/
So I used an Aqara door sensor with the reed switch removed and added a connector.
Thanks both.
Odd that there isn’t a ready to go zigbee offering.
Setting up a second HA instance at a remote location and going to use a bunch of my old zigbee devices so was hoping to avoid setting up zwave for a single device.
The wiring schematic for the sonoff zbmini seems to suggest that the Switch contacts are dry inputs (you short S1 & S2 to trigger the switch).
However, bear in mind that these could be referenced to mains voltage, so treat them as such unless you get your hands on proper schematics or confirmation from an owner with a multimeter.
For safety and convenience, I’d go with the Aqara door sensor mentioned above, or, better yet, their flood sensor. That one has the contacts exposed so you could easily attach wires without having to open the device.
If it wasn’t Aqara I’d be inclined to go that route. I have never had good luck with their stuff and with it being at a remote location, going to avoid them 
Will look into the other though.
Personally, I’ve had no reason to complain regarding any Aqara devices.
Having said that, I’ve seen reports from other people regarding issues with them, and your experience seems to be the same.
Before risking life and limb on a mains powered Sonoff, maybe try a Zigbee flood/door sensor from a brand you trust?
I finally found the battery powered zigbee device with input dry contacts. It actually works as a binary sensor. PushOk Hardware POK010 control via MQTT | Zigbee2MQTT
I am not sure which countries the producer may sell it, but it is their email to ask - [email protected]
That’s essentially the same thing as the door sensor suggested above. Only difference is that the contacts are already exposed.
If you didn’t want to open up a door sensor, any flood sensor with exposed contacts would have given you the same functionality.
