I'd like to check if I use some specific DDS, like fastdds, or cyclonedds, can ROS2 humble on one PC communicate with ROS2 Jazz on the other PC?
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I've tried this before and I've empirically observed it to work with basic topic publication and subscription. That said, mixing ROS distributions is not recommended or officially supported:
https://github.com/ros2/ros2_documentation/issues/3288#issue-1557321305
And the answer is NO for both cases. currently ROS 2 does not support any cross-distro or cross-vendor communication officially. (which is my understanding, if i am mistaken, let me know) some of these cases are implemented in test code, but that does not mean that we support these compatibility.
The rest of that discussion thread has a lot of good information.
From https://discourse.ros.org/t/ros-2-tsc-meeting-minutes-2023-02-16/29927, some clear guidance:
Cross Distro – might break API / ABI – this is a bad
Surprising this works but can break in really subtle ways
Chris et al are working on a potential solution but this will not land in Iron.
No testing of cross distro
Chris: This needs to be documented - but we need to make it very very clear that it is bad, but you can work around it in exceptional cases.
Kat: Official policy is that cross distro is bad and will not work
