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To make a callback run to need to spin. Are you spinning? http://wiki.ros.org/roscpp/Overview/Callbacks%20and%20Spinning

To make a callback ~~run~~ run, you to need to spin. Are you spinning? http://wiki.ros.org/roscpp/Overview/Callbacks%20and%20Spinning

To make a callback run, you to need to spin. Are you spinning? http://wiki.ros.org/roscpp/Overview/Callbacks%20and%20Spinning

Of course then the trigger for the callback also has to occur so you'll have to make sure the publisher is publishing.

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