Backport timeout options on humble

[tokoro10g]

Feature request

Feature description

• Backport options such as ros2 topic echo --time-out on humble

Implementation considerations

Is there any policy for backporting? My opinion is that these basic tools should have the same interface across the distributions until it reaches the EOL. What do you say?

[fujitatomoya]

you can see https://docs.ros.org/en/rolling/How-To-Guides/Package-maintainer-guide.html#backporting-to-released-distributions as guideline.

AFAIK, it also depends on the behavior change that could affect the application, tools and so on.

adding command line options can be considered as behavior change. but on this one, i do not see any of that, so it would be probably okay to go? that is not i am 100% sure, so lets keep this open for more feedback.

Related PRs,

• Adds a timeout feature to rostopic echo #792
• (support ros2topic echo once option. #695)

CC: @ros2/team @clalancette @wjwwood @audrow

[tokoro10g]

Thank you for the consideration!

I would also like these backported:

• Adds a --max-wait-time option to ros2 topic pub  #800
• add timeout option for ros2param to find node. #802

They also looked straightforward and not breaking anything. I have not checked all the options, though.

[clalancette]

Is there any policy for backporting? My opinion is that these basic tools should have the same interface across the distributions until it reaches the EOL. What do you say?

The general policy is to only backport as things are requested, and as feasible. Because of our strong API and ABI guarantees in the core, backports are often non-trivial (though they tend to be easier with Python).

For the ones you've requested:

• Adds a timeout feature to rostopic echo #792 - does not change API or ABI, so should be safe
• support ros2topic echo once option. #695 - does not change API or ABI, so should be safe
• Adds a --max-wait-time option to ros2 topic pub  #800 - does not change API or ABI, so should be safe
• add timeout option for ros2param to find node. #802 - does seem to change API, so probably needs to be refactored a bit for a backport to Humble

@tokoro10g if you'd like to backport these (keeping the current API), we'd be happy to review them