CombiCooler 2000: setProgram impossible?

[menbergs]

Hi. I tried to embedd my V-Zug CombiCooler 2000 into HomeAssistant using your Repo. So far so good, discovery and embedding went pretty smooth. Great.
Sadly, I just found out that its only possible to READ stats - I dont see any way to SET the fridge temperature. Is it true, or did i miss anything?

The frige is running on the latest firmware, its also connected to wifi and thus accessible by the genuine vzug app. My Home Assistant sits in the same network like my fridge. If i use my fridges IP, i am able to call the API.
Like 192.168.xxx.xxx/hh?command=getProgram gives me a propper response. If i call ?command=setProgram, i only get error code: 400.03. It doesnt matter if i add anything similar like &value={ ... }. Nothing usefull to set.

the cooling compartiment runs under the id 2000, the freezer's id is 2001. so i tried to use something like this and failed:
setProgram&value={"id":2000, "temp":{"set":8.0}, "id":2001, "temp":{"set":-14.0}}

I also cannot find any public documentation of vzugs API. Now im a little lost and disapointed by vzug. is this really the way to sell "smart devices" in the year 2026 or did i miss something important?

[siku2]

I also cannot find any public documentation of vzugs API. Now im a little lost and disapointed by vzug. is this really the way to sell "smart devices" in the year 2026 or did i miss something important?

Welcome to the club :(
I've had to come to the same realization over time. I haven't found a meaningful way to control any of my vzug devices.

FYI all the APIs I discovered are from reverse engineering. Either from the web servers exposed by the device, decompiling / mitm-ing their mobile app, or just straight up guessing.

[siku2]

Just to confirm though - are you able to set the temperature using the app or any other non-physical interface? If so then there's at least a chance we can reverse engineer it.

[menbergs]

Yes, but only if the phone is connected to the same wifi. Bluetooth doesnt matter, it looks like the phone's app and the fridge need a direct connection to communicate.
The strange part is: my Home Assistant is also in the same wifi like the fridge and gets treated like a remote device.

[siku2]

That's definitely interesting. Either that's something specific to your device or it's a new feature they added to their app after my last deep dive.
I will try to find some time this weekend to look into their source code again - maybe there's hope :)

Maybe another follow up question. Can you adjust these settings through the web interface as well? That would be significantly easier to reverse engineer.

[menbergs]

Nope, the local webUI doesnt allow me to change anything (except the local time).