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Hey,
I'm just starting to learn ROS2 and I'm wondering whether it is possible to know the default topics of a node (or should I say an executable?) before you run it. Something like `ros2 node info turtlesim_node' but not having to start it first? Is there a command line tool for it?
For ROS 2, below command should print out the lines that contains the create_publisher inside the code to the terminal and you can extract the info such as topic name topic type etc from there. this should work with python and cpp
cat <path_to_source_file> | grep "create_publisher"
For ROS1, use
cat <path_to_source_file> | grep "advertise" for cpp and cat <path_to_source_file> | grep "Publisher" for python.
Hi,
You can just go into the node file and look for publishers or subscribers. It would be located somewhere like this:
~/ros2_ws/src/package/package/src/file.cpp (it can also be a Python file)
For step by step instructions, check out this video: https://youtu.be/Ny7AL2XlXmY
Asked: 2022-11-29 13:31:34 -0500
Seen: 492 times
Last updated: Dec 07 '22
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