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You code looks okay. Did you try adding latch=true to your rospy.Publisher()?

You code looks okay. Did you try adding latch=true to your rospy.Publisher()?? If that doesn't work, maybe this is the problem: http://answers.ros.org/question/84336/latchtrue-in-rospypublisher-appears-to-have-no-effect/ . Try adding a sleep between creating the publisher and sending the msg.

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