The ROS Wiki is for ROS 1. Are you using ROS 2 (Dashing/Foxy/Rolling)? Check out the ROS 2 Documentation
This tutorial covers how to write a service and client node in ruby.
This tutorial covers how to write a publisher and subscriber node in ruby.
Create a new tutorial:
Wiki: rosruby/Tutorials (last edited 2012-06-09 03:30:00 by Takashi Ogura)