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Please look over ROS tutorials (http://wiki.ros.org/rospy/Overview/Publishers%20and%20Subscribers).
A subscriber object is not a message, its declaring a subscription to a topic with some parameters. The callback is what will process incoming messages. The syntax you wrote here is nonsensical with the API.
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Please look over ROS tutorials (http://wiki.ros.org/rospy/Overview/Publishers%20and%20Subscribers).
A subscriber object is not a message, its declaring a subscription to a topic with some parameters. The callback is what will process incoming messages. The syntax you wrote here So in your example the scan_msg is nonsensical with actually a subscriber object and the API. scan_message is a callback function signature.
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