You may want to check out my ST_Anything project, as well as the ST_Anything_Doors projects which I have shared with the community. The Doors version includes the virtual device types and what I call a “Multiplexer” Smart App which provides an example of the capability you’re looking for. It would be great if ST fully implemented the feature mentioned earlier in this thread, but I am not going to hold my breath any longer. There are also some examples of how others have used my Arduino Libraries and SmartThings Device Types and Smart Apps to implement there own projects. Take a look. It should help kick-start any ST/Arduino work you are planning.