I wrote to Devi and they do not release the protocol nor do they have plans to add Z-Wave or any other HA compatible protocol at the moment. So as it stands: it needs to be hacked to get it to work.
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Have a look at Ebeco EB-Therm 500 with WiFi module. It integrates with HA.
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I must have missed Ebeco. Those looks great, thanks! I’m still pretty new to home assistant, but I suppose it’s this one then: https://github.com/joggs/home_assistant_ebeco?
Has someone been able to make Devi Smart Thermostat work with ha or at least run a service that can talk to their cloud?
I have been reading DEVIComm and DEVIReg Smart thermostat binding - Add-ons - openHAB Community which were both pointed out above, but I have had no luck so far.
It is quite funny to call a Thermostat smart if you cannot even know how often and for how long it has been on or off. An API or a ha integration would solve this issue really well.
Their support is cloud one, not local. It’s better then nothing of course but not perfect.
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Is there any news here? Has anyone found a way to integrate the thermostats?
I have contacted the manufacturer and asked if anything else is planned in the future in the direction of the interface. The answer is unfortunately very clear 
“There will be no interface adaptation for other smart home systems for the DEVIreg Smart.”
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I have my Danfoss Icon (similar protocol to Devi Smart) system running successfully in OpenHAB; was thinking about porting this to HA, is there interest in this?
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Absolutely 
They are the only device I miss controlling via Home Assistant.
Yes, please 
Very interested aswell 
YES - very much appreciated!
Please, that would be fantastic!
You will be my hero if you bring DeviReg Smart support to HA!
Yes please
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Yes please
Absolutely, the only thing not integrated in HA. I was already considering changing
to something else.
+1 would love this too!
Very interested!
Anything new on this?