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code works as correctly, file names are correct but grader failed.
Did you check all the points mentioned by the grader? Specifically, how long before you service client exits?
is it correct to add time.sleep(10) after the loop while rclpy.ok(): and before the client.destroy_node() ?
No, the right way it to wait for the result from the server before exiting. I believe you have an example of that in the notebook.
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