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Without checking or too much experience in ros2:

your rclcpp::spin(node) is only after the while loop. So your node is not added to an executor and callbacks won't be executed. In ROS 2 there is rclcpp::spin_some(node) which looks like the thing you are looking for. Add the spin_some statement inside of your while loop and remove the spin(node).

I would be happy if you provide feedback on this answer.