I’m having difficulties to understand the UoM-concept in terms of items not attached to a binding and things. As I understand, if a binding is configured and updates states, you can define the “origin” unit for the binding and then I can decide in the item-definition, if I want another unit. So e.g. my binding collects sensors in imperial measures, I can easily display them in the item as metric measures.
So far so good. I use a weatherstation (see Outside WiFi weather station "WS3500" and local customized upload (no cloud needed)) and the WS3500 automatically sends the corresponding values in imperial measurement to the openHAB REST-API and updates my items.
So now: can I tell openHAB, that the source is Fahrenheit and the value should be Celsius?