Hi I am quite disappointed in the Danfoss Ally app and looking for other options to integrate to Danfoss Ally radiators. Danfoss Ally Gateway offers a possibility to integrate through cloud API. It should be a pretty standard API with OAuth2 authentication. How difficult would you say developing an app to control Danfoss Ally radiators through API would be? I am primarily planning to use the app for my own purposes only as then I would not need to make the devices dynamic, but I could “hardcode” my devices into the app. I have some background as developer in the past and lately I have worked on some minor projects with Groovy etc. I noticed there are examples using OAuth2 available. Would you say that I should give it a shot or would I be doomed right from the start? Also, is it possible to develop an app that only runs in my own Homey without exposing it to the Marketplace in any way?

I can now confirm that when the Danfoss temperature sensors are added as a subdevice in Smartlife and in the same room as the thermostats, they assume the function as intended and the same as in the official Ally Danfoss app. So there’s really no need to use the Homey Danfoss app anymore because in this way it’s more stable and more functionality like firmware updates. It’s even possible to add the sensors but that’s a bit more complicated. But it can be done by listening to the Tuya messages Homey receives and a virtual device but it basically only adds humidity.

Just to clarify: So you removed the connection of your Ally Gateway to the Ally app and you only connected the Ally Gateway to Smartlife app and Tuya cloud? I assume then also current connection to thermostats and sensors are lost and you need to link them again to the Ally Gateway using the Smartlife app? But does it also do the firmware updates this way for both the thermostats and temp sensors?

Correct! Everything works fine in the Smartlife app including updates.

I’ve been a bit absent in this topic! Still a a lot to do at home and this hasn’t been top priority (still isn’t, sorry about that). My system is not (always) working as intended. I’ve had moments where the convectors wouldn’t start heating while the thermostat were set to “heating”. It’s been a while and I can’t remember if the Icon unit received a heating signal or not, but there surely wasn’t any hot water flow in the pipes to the convector. So I’ve got a few things to check, setup and validate to be working before I’m going to burn my fingers on integrating it into another system.

[image] Doekse: We currently have a considerable number of partners on the waiting list. Since Danfoss is not developing the integration themselves at this stage, we’ll need to wait for available bandwidth with our agencies. However, we expect a realistic timeline to be sometime this summer. Any updates from your side @Doekse ?

Once again, if you don’t want to wait the Ally works perfectly in the Tuya Cloud app when you add your gateway to Smart Life [IMG_5272]

Thanks Marcus. I think that will be a great option with TRV’s. However I am planning to also have Danfoss Icon2 for underfloor heating. I wonder if Smartlife would work with that as well?

If the app is Tuya based it probably does but can’t be sure of course

Just found out a limitation in this solution. Controllable device pool seems to be 10. If there’s more thermostats, then this again is not an option. Furthermore, Tuya cloud seems to consider some of my Ally Room sensors as controllable, which consumes this quota unnecessarily. So the limit for the amount of thermostats seems to be even lower than 10 in practice.

Developing an app for Danfoss Ally API

Developers

petero-dk September 4, 2025, 7:19pm 35

I just released a test version of a Danfoss Air app that works on the LAN interface: [APP][Pro] Danfoss Air

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Developing an app for Danfoss Ally API

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