I’ve just received a Shelly H&T Sensor for Humidity & Temperature.
It works really fine but it seems to take it’s own heat into account.
That means that it reports a steady 20°C when it should in reality only have 18°C. This is expected because every electronic device causes heat.
Now I want to have an offset in there to properly subtract that value.
I created the items in PaperUI so I can understand how MQTT works
I stumbled across the “Transform values” but I have no clue how they work or what I can do with them. It should basically just take the received string (in my case a number) and subtract a defined value and then communicate that to the item that is attached to that.
According to the API Sheet from Shelly, it just delivers a number.