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You could subscribe to the topic ( http://wiki.ros.org/ROS/Tutorials/Wri... ).
EDIT
If you subscribe to the topic, the respective callback will be called every time a message is sent on this topic. If not, it will not be called. Then you can do what you want with the respective result.
I would like to check if messages are published at all, I don't need to know the message. It is a topic from an actionserver, but I need to check without writing a client/
Right... of course, I will give this a shot and report back.
mig is right, there is no other way. From the command line, you can call rostopic hz <topic name>, but that command is also implemented by subscribing to the topic and throwing away the message contents.
just write a subscriber (like in the tutorial) that hooks on the topic you are interested in. Then, once the callback gets called just store the time (inside the callback -> ros::Time callback_time = ros::Time::now();). In the main program check if the time has changed.
You can open a terminal window while the node is running and enter the command rostopic echo <topic name>. If data is being published to the topic it will now show up in the terminal window.
Here is a list of the rostopic commands for future reference.
I would like to check in C++ code indeed. Additionally I want check whether messages are published at all.
Asked: 2016-06-22 10:14:04 -0500
Seen: 19,432 times
Last updated: Dec 02 '20
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