Hello,
ROS_INFO()
will display the message in the terminal, but ROS_INFO()
will also send a message to /rosout
.
If you create a node that subscribe to /rosout
and use ROS_INFO()
, you will write an infinite loop because :
1 . Node receive message from /rosout
2 . Node print with ROS_INFO()
3 . ROS_INFO()
Send a message to /rosout
4 . Go back to 1
For a simple example of how to do a subscriber, you can subscribe to /rosout
and simply use std::cout
for displaying the message (or your favorite logging system that doesn't use /rosout).
If you want to extract Warning, Error or Fatal level message, you can use a message filter, or just discarding message with logger level less than warning in the beginning of the callback function.
You just need a subscriber to the topic to read the data it contains. You can follow example here