They've got the IDL files as well for the APIs, but you can't use them without their libs:

> The data model is defined using a custom format .rmodel based on the ddkit > framework (rmodel-api).

> Please note that the .rmodel data model is for documentation purposes only and > does not reflect the actual interface used on the communication layer. Network > communication is only possible through the provided libraries.

I think that’s what the “protcol” (sic) in the title was supposed to indicate. I agree it’s misleading.

Theres probably some tender that says it must be a "open platform" "open ecosystem" "modular vendor independent" whatever. So you upload some slop to GitHub and tick the box.