How can I connect an Xfinity Home door open sensor?

I had Xfinity Home and when I stopped the service I got to keep all the sensors. I believe they will work with my SmartThings Hub. In particular I have some Visonic MCT-320 SMA Door/Window Sensors. I’ve gotten them to pair with the ST Hub but the status is “unknown”. Anybody have any luck with these?

Unfortunately they use a different zigbee profile than SmartThings does and although they will pair, the two cannot talk to each other. It’s a private encryption. This is fairly common with security systems.

Smartthings uses the zigbee home automation profile (ZHA 1.2). So you need to look for devices which are certified for that specific profile , not just Zigbee.