Hi, thanks for a response and sorry for a late answer, just back from vacation.
Bluetooth communication should be abstracted, an interface goes to the domain layer, implementation goes to the blue circle
http://blog.cleancoder.com/uncle-bob/images/2012-08-13-the-clean-architecture/CleanArchitecture.jpg
The same level as the data layer, but it’s not really correct to call Bluetooth communication “data”.