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please first understand the tutorial:ROS/Tutorials/WritingPublisherSubscriber(c++)

Note: The topic name of the publisher and subscriber that you creat must be identical! you can remap the topic name by name Remapping and Remapping Arguments at the command-line

please first understand the tutorial:ROS/Tutorials/WritingPublisherSubscriber(c++)

Note: The topic name of the publisher and subscriber that you creat must be identical! you can remap the topic name by name ~~Remapping~~Remapping at the Roslaunch and Remapping Arguments at the command-line

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