Here is the driver i currently use
https://raw.githubusercontent.com/Mark-C-uk/Hubitat/master/Danfoss%20Living%20Connect%20and%20POPP%20Radiator%20Thermostat
As found in these forums:
My apologies for the lack of info and lack of understanding, i intend and wish to learn more about the drivers so i can attempt some fixes.
THis particualr driver is (apparently) working ok for my other "popp TRV" device so i am reluctant to tweak it for the sake of this other device. i am aware i could copy the code and give it another name.
Bizarrely, it all appears working today. However, last night (after the chat above) I tried the "generic z wave thermostat" driver which failed over night. I think this was due to the wake-up command not being set and timing out. In my experience, this needs to be under 30mins in order to keep a communication link between the device and HE. So, this morning, i reverted back to the "danfoss/popp" driver that has the wake-up parameter set to 20min and it is working today, as it was over the weekend. The fact it works ok somedays and fails occasionally makes it hard to figure out where the problem lies. I will continue to monitor my logs.
