Fix throttle publish first message

[efernandez]

Follow up PR for #1943

This adds two more commits that fix the test and a potential bug:

• Wait for throttle_publishtest subscriber
• Resolve output topic name when waiting for subscribers

[efernandez]

@dirk-thomas This updates #1943, providing the changes requested

[dirk-thomas]

@dirk-thomas This updates #1943, providing the changes requested

@efernandez Sorry, I am not the maintainer of this repo anymore.

[efernandez]

@fujitatomoya @jacobperron I've seen you've reviewed some recent PRs, so I wonder if you could help me reviewing this one or finding someone that could do so. Thanks.

[efernandez]

pinging @jacobperron

I'd like to know your thoughts on this.

[sloretz]

Thank you for the PR!

ROS Noetic will reach end-of-life on May 31st, 2025. Every change comes with a risk of introducing regressions, and there isn't much time left to fix them. To make sure this PR doesn't introduce any regressions please:

• Describe how you tested this change
• Recruit at least one more person to review this PR and try it out on their system

[sloretz]

ROS 1 is end-of-life (EOL) as of today, May 31st 2025. I am archiving this repository because:

• it only supports ROS 1
• it isn't needed anymore in ROS 2

If you still rely on ROS 1, read this page to learn about your options.