Speed Limit for the Real Robot Turtlebot

I am working with the turtlebot in the real robot lab and am not sure I understand the linear speed limit. The notebook (in the rosject in ROS Basics In 5 Days, Python) says that my node will be killed if it commands a linear speed exceeding 0.19. My wall following program ran successfully on the real robot with a linear speed of 0.15. When I tried 0.16, it was killed. Is there something I am missing about the speed limit? Does proximity to an upcoming wall affect it?

The speed limit is 0.19. Maybe another process was causing the robot to stop? you also need to publish with a rate in the real robot in order to get more than one message through:

rostopic pub -r10 ...

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