Python/Rust interop

[ahenshaw]

I'm running the Python hello_world publisher and the Rust hello_world subscriber, which will mirror how I need to have my first hdds project work. I'm not receiving any messages in the subscriber. The publisher started up and acts like it is doing what it should. Has this configuration been tested?

[hdds-team]

Hi! Thank you for trying out HDDS and for taking the time to report this — great first use case!

You actually ran into a bug that was present in the Python SDK. The good news is it has been fixed in commit 9cd7933 (Mar 6 2026).
The Python publisher was announcing a mismatched DDS type name during discovery, so the Rust subscriber would silently skip it —
hence the radio silence. On top of that, WaitSet.wait() had a bug where it returned True even on timeout, which made the publisher side look healthy when it wasn't.

To get the fix, just pull the latest master and reinstall the Python SDK. The hello_world.py sample in sdk/samples/01_basics/python/ has been updated accordingly.

Cross-language pub/sub (including Python → Rust) is now part of our CI verification gate, so this combination is actively tested going forward.

Don't hesitate to reach out if you run into anything else — happy to help! 🙂