[knx] Change the conversion of the DPT251.600 to use RGB and White.

[genesis81]

With the new feature, the HSBType is converted into RGBW, and we convert the status signal from the KNX back into an HSB value.

Due to the conversion, some accuracy is lost, but the result is approximately correct.

Need #openhab/openhab-core#3849 to work.

[holgerfriedrich]

Rebuilds can be triggered by adding and removing the label "rebuild".
Btw: We have to wait until the nightly build of core creates another snapshot.

[J-N-K]

I have triggered a core build. It should be available in about an hour.

[genesis81]

Rebuilds can be triggered by adding and removing the label "rebuild". Btw: We have to wait until the nightly build of core creates another snapshot.

Thanks for the information, but my mistake was that i pull the actual branch and push. I didn't see that i lost my changes. Normaly i work with .NET and Visual Studio. NetBeans is not my prefered IDE.

[genesis81]

Rebuilds can be triggered by adding and removing the label "rebuild".

I can't apply new labels to the Pull Request. No rights.

[lolodomo]

LGTM, thank you

[lolodomo]

Let's wait still few days for a potential feedback from @kaikreuzer or @holgerfriedrich

[holgerfriedrich]

Pls do not merge yet.

[holgerfriedrich]

This PR would actually change the behavior of the binding. As of now you can use HSBType for RGB and a PercentType for the W channel.

I think it is useful to bring in the conversion from RGBW which merges RGB and W into HSBType - but users should be able to select both the old and the proposed handling. I am thinking of using a custom DPT like 251.60600.

I already have a draft for this, give me some time to check.

[lolodomo]

Pls do not merge yet.

I added the tag "won't fix", even if not really appropriate, to avoid a merge.
Should we simply close this PR @holgerfriedrich ?

[genesis81]

Done with #16078