I finally got my hands on this Zigbee keypad device from DK based company Develco Products.
I have paired the device - and tried several different of the drivers (Centralite, Iris e.g.) but have no luck in getting the device to change HSM status or register any events in the logs. I obviously suspect the driver - but is there any way to get my hands on one of the HE drivers in order to try and make a driver myself? (some 30 years ago I used to be a programmer - so I hope to be able to 'crack' this one but don't want to start from scratch)