Let's check the ROS topics and ROS parameters created after running roscore. The following command will list the active topics on the Terminal:
$ rostopic list
The list of topics is as follows, as per our discussion on the rosout node subscribe /rosout topic. This has all the log messages from the ROS nodes and /rosout_agg will rebroadcast the log messages:
/rosout /rosout_agg
The following command lists the parameters available when running roscore. The following is the command to list the active ROS parameter:
$ rosparam list
The parameters are mentioned here; they have the ROS distribution name, version, address of the roslaunch server and run_id, where run_id is a unique ID associated with a particular ...
