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I had the same problem, using it like this:

rospy.wait_for_message("ar_pose_marker",AlvarMarkers)

The problem was that I missed a rospy.spin() in the whole Python script, because I did not intend to create a ROS node. However the missing rospy.spin was causing rospy not iterating through the message queues, thus waiting forever even if the topic actually publishes something.

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