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The best way to implement something like this is rospy.wait_for_message(..). Creating Subscribers in callbacks is not a good idea.
If you're really only interested in a single message (which happens to be 'the last' only because of latching) then don't create the Subscriber, but use rospy.wait_for_message(..) only.
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The best way to implement something like this is rospy.wait_for_message(..). Creating Subscribers in callbacks is not a good idea.
If you're really only interested in a single message (which happens to be 'the last' only because of latching) then don't create the Subscriber, but use rospy.wait_for_message(..) only.
Note btw that what you show in your question text is really brittle: there is no way to guarantee that globvar will contain an actual message object at that point.
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