For Color you use an enum which makes code much easier to read as you can just use RED or CYAN to refer to the respective colors. For the sounds, we have to write DuploTrainBaseSound::BRAKE which makes reading a bit more clumsy. It's of course nothing major and maybe I just overlook an important aspect, but if it is exchangeable, why not use a simple enum here as well?
https://github.com/corneliusmunz/legoino/blob/434b74fe6717640a9d054ef7533d68c764e33a5d/src/Lpf2HubConst.h#L224
For
Coloryou use an enum which makes code much easier to read as you can just useREDorCYANto refer to the respective colors. For the sounds, we have to writeDuploTrainBaseSound::BRAKEwhich makes reading a bit more clumsy. It's of course nothing major and maybe I just overlook an important aspect, but if it is exchangeable, why not use a simple enum here as well?