(ROS dynamic speed limit (detect the total speed of the external network for speed limit switch) nonsense, look at the script principle first: the following operations are all completed in the winbox interface: it can automatically close all generated speed limit rules when the total speed is not more than 9m, and automatically start all generated speed limit rules when the total speed is more than 18m. Note: when inputting script content, do not bring () on both sides. That is to distinguish non script characters. Total speed = current speed of your external network card.)