Add a tutorial for the new ParameterEventHandler class

[mjeronimo]

This tutorial depends on the following functionality: ros2/rclcpp#829, which should be integrated before this PR.

@Mergifyio backport rolling

Signed-off-by: Michael Jeronimo [email protected]

[clalancette]

I'm going to mark this one as a "Draft" until the dependency is merged.

[mjeronimo]

The required PR, ros2/rclcpp#829, has be merged.

[kscottz]

Anything stopping us from getting this merged? If I don't hear anything in the next 48 hours I am going to assume everything is ok.

[clalancette]

Anything stopping us from getting this merged? If I don't hear anything in the next 48 hours I am going to assume everything is ok.

The original PR that added the functionality (ros2/rclcpp#829) was reverted. I'm not sure if its replacement has been merged yet, can you comment @mjeronimo ?

[jacobperron]

This generally looks good to me 👍

Some suggestions and questions below.

Also, more of a meta-question. Do we have some criteria for what constitutes a "beginner" tutorial versus something else?
Intuitively, I'd say this tutorial is appropriate for beginners, but I was just wondering.

[clalancette]

Also, more of a meta-question. Do we have some criteria for what constitutes a "beginner" tutorial versus something else?

That's a good question. There's no written criteria for it that I know of.

Intuitively, I'd say this tutorial is appropriate for beginners, but I was just wondering.

My intuition says that this should be an Intermediate tutorial. My reasoning is that a beginner doesn't have to know this information to get started using ROS 2; it's a nice additional benefit when you get into developing your own nodes. But I don't feel really strongly about it.

[mjeronimo]

@clalancette The required PR has been merged into rclcpp. I'll address Jacob's comments now.

[mjeronimo]

@clalancette @jacobperron Moved this to the Intermediate Tutorials list, per Chris' comments.

[jacobperron]

My reasoning is that a beginner doesn't have to know this information to get started using ROS 2; it's a nice additional benefit when you get into developing your own nodes

I like that qualifier for being part of the beginner tutorials; tutorials covering stuff that users really should know about when getting started.

[jacobperron]

LGTM, two minor comments