Strategies for YAML Message Generation Using ROS CLI

[kscottz]

This one comes in from the Discord, but it is also something I've encountered personally. For complex ROS messages it can be difficult to use the ROS CLI. I think it would be helpful to have an intermediate tutorial on how to dump a YAML message from the CLI, modify the message, and then republish the message using ros2 topic pub etc.

I am pretty sure there is a way to do this but it is non-obvious to new users. It would be helpful to have something to refer to for debugging.

[fujitatomoya]

@kscottz

just wanted to share current status.

currently we can ros2 topic echo to save the messages in yaml file format, but we cannot ros2 topic pub with using yaml file just yet.
the original issue ros2/ros2cli#919, and enhancement is on review ros2/ros2cli#925.

adding documentation, i totally agree once the feature is ready.

[kscottz]

Thanks for adding context @fujitatomoya. I seemed to remember that we had this discussion earlier in the year. I'll see if I can't help move along that PR next week. Once that gets merged this would be a fantastic task for a first time contributor.