Before running any ROS nodes, we should start the ROS Master and the ROS parameter server. We can start the ROS Master and the ROS parameter server by using a single command called roscore, which will start the following programs:
- ROS Master
- ROS parameter server
- rosout logging nodes
The rosout node will collect log messages from other ROS nodes and store them in a log file, and will also re-broadcast the collected log message to another topic. The /rosout topic is published by ROS nodes by using ROS client libraries such as roscpp and rospy, and this topic is subscribed by the rosout node which rebroadcasts the message in another topic called /rosout_agg. This topic has an aggregate stream ...
