\subsubsection parameters ROS parameters

Reads and maintains the following parameters on the ROS server

- \b "~lower_limit" : \b [double] Lower limit min: 0.0, default: 0.0, max: 5.0
- \b "~upper_limit" : \b [double] Upper limit min: 0.0, default: 3.0, max: 5.0

