sdmlib is a cross-platform C++11 library for encoding and decoding Smart Device messages.
The library has bindings for Python and NodeJS for use in Runtime and the Simulator, respectively.
SmartDevice is an Arduino library that uses sdmlib to implement the Smart Device protocol.
This library implements functionality common to all Smart Devices, including message queueing, parameter storage, and interfacing with the hardware.
Finally, there are Arduino sketches for each type of Smart Device.
These sketches complete sdlib stubs that implement functionality specific to each device type.
Note on the source tree: The arduino-cli build system uses a lot of magic that makes it difficult to compile non-Arduino sources.
For now, SmartDevice/src/cobs.* are symlinks that point to their counterparts in the cobs-c submodule.
Be aware that if your filesystem does not support symlinks, the sketches will not compile.