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Not necessarily an answer to your question, but an answer to your problem.
Why do you publish the 3 numbers separately? Would it not be easier to use a vector?
You could use the vector3 message from geometry_msgs and publish the 3 points in one go. This would remove a lot of headache, I feel.
If you do want to publish them individually, the answer to the question you posted suggested using a class and save the values as member variables to the class. Have you tried this?
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