I'm currently toying with a similar process which I think falls under the interoperability exemption:

- Get an apk online, you haven't accepted a EULA.

- Run jadx to get some code to work with

- Ask Claude to extract the protocol specification cleanly for a Bluetooth device with capabilities etc.

- Use Claude to implement a version as a TUI/CLI in go, rust, whatever.

I get to use a device I own with a local Bluetooth connection from my machine, maybe Home Assistant. I do not contact any online services (there are none anyway in that case).

Since it's to avoid getting locked in with proprietary OS, it's a clean room reversing through a spec and an LLM produced a non copyrightable output... Can I just release this however I want? Probably a basic MIT or CC0, whatever...