[Iron] Clarification on "setup bag" in ROS 2 Iron Tutorial

[songyuc]

Hi, guys,

I am currently going through the ROS 2 Iron documentation and came across a reference to a "setup bag" in the Reading from a bag file (C++) tutorial. The tutorial mentions running a script with the path to this setup bag, but I am unsure what this bag file refers to or where it is created.

Could you please provide some clarification on what the setup bag is and in which part of the ROS 2 tutorials it is created or introduced? This information would be greatly helpful for understanding the context and completing the tutorial effectively.

Thank you for your assistance and for the valuable resources provided in the ROS 2 documentation.

Best regards,
Yucheng Song

[iuhilnehc-ynos]

[songyuc]

Hi, @iuhilnehc-ynos,

Thank you for your response to my query regarding the "setup bag" mentioned in the "Reading from a bag file (C++)" tutorial. I have reviewed the "Recording a bag from a node (C++)" tutorial as you suggested, and I found it to be very informative on the process of recording data to a bag file using a custom C++ node. The tutorial details creating a new package, writing the C++ node, and running the node to record to a bag file named "my_bag".

However, I did not find any reference to a "setup bag" in this tutorial. The term "setup bag" was not explicitly defined or used in the context of the tutorial, and it appears that the "Recording a bag from a node (C++)" tutorial focuses on working with a newly created bag file rather than using an existing "setup bag".

Could you please provide further clarification on what the "setup bag" refers to? Is it a term from a different tutorial or a commonly used bag file in the ROS community that I might have missed?

I appreciate your time and assistance as I navigate through the ROS 2 documentation.

Best regards,
Yucheng Song

[iuhilnehc-ynos]

The bag file can be generated by code or ros2 bag record, if you want the bag file that can be directly used in the Reading from a bag file (C++), I suggest seeing https://docs.ros.org/en/rolling/Tutorials/Beginner-CLI-Tools.html, especially https://docs.ros.org/en/rolling/Tutorials/Beginner-CLI-Tools/Recording-And-Playing-Back-Data/Recording-And-Playing-Back-Data.html#record-multiple-topics . As the section is located before Advanced, I don't think it's necessary to update the doc.

[songyuc]

I guess, "setup bag" actually refers to "subset bag", am I right?

[iuhilnehc-ynos]

'subset' is the file name in https://docs.ros.org/en/rolling/Tutorials/Beginner-CLI-Tools/Recording-And-Playing-Back-Data/Recording-And-Playing-Back-Data.html#record-multiple-topics.

[songyuc]

I am just a little confused about why "subset bag" is called "setup bag". (Please excuse me if you feel this is a silly question)

[iuhilnehc-ynos]

I am checking why it it named from subset to setup.

[iuhilnehc-ynos]

I think it's a typo as it's metioned at the beginning.

Can you create a PR to fix it?

[songyuc]

Yes, I can. Please give me some time to do it.

[fujitatomoya]

@songyuc thank you for the contribution. i will go ahead to close this, #4050 has been merged and humble / iron backports also done.