Capture implicit message definitions for action feedback messages

[taughz]

Description

I would like to be able to record a bag using --include-hidden-topics and have it capture implicit message definitions for action feedback messages, e.g., action_tutorials_interfaces/action/Fibonacci_FeedbackMessage. I know service introspection is on the way for Jazzy, but it's unclear to me if service introspection solves this problem. I'm currently on Humble and using -s mcap; I also tried Iron and Rolling, but got the same error message:

[ERROR] [1704486429.414617621] [rosbag2_cpp]: Message type name 'action_tutorials_interfaces/action/Fibonacci_FeedbackMessage' not understood by type definition search, definition will be left empty in bag.

It looks like work on this feature was started in #1341, but then that effort was stopped. (Was there another issue or PR that replaced that one?)

Related Issues

• Recording hidden action topics fails with -s mcap, works with default storage plugin #1286
• Allow for definitions from srvs, as long as the .msg file can be found #1341

Completion Criteria

• The implicit message definition is somehow captured and stored in the bag.
• No longer see the not understood by type definition search error message.

Implementation Notes / Suggestions

• None.

Testing Notes / Suggestions

• None.

[ryank-cobot]

I would also love this functionality!