When trying to change color temperature I get this error:

I'm using ShellyForHass 0.1.7 beta 2

Could very well be a bug in the firmware. The same problem is present when using MQTT.
@me1299 this is possible. Did you report this problem to Shelly via their Facebook profile? Maybe they don't know about this bug.
Their Facebook page says they are aware of the problem and will release a new firmware. They just released one a few days ago, but I don't think it fixed the issue.
could you post a link to that post? It will be useful.
Fixed, will be available in 0.1.7.b3
@hakana any plans to release a new beta soon? 馃
Yes, now!
This works fine now 馃帀 , but I got confused a bit at first.
In Shelly app warm white (yellow) is on left, but is HA it is on right. Is this configurable?
No, it can't be changed from our component.
I close this issue as it is fixed in 0.1.7.b3.
@hakana thanks for the reply!