This is ROS package mentioned in the book "Learning Robotics using Python". This package contain drivers, Launch files for working with Chefbot, mentioned on this book|New version of code for ROS Kinetic: https://github.com/PacktPublishing/Learning-Robotics-using-Python-Second-Edition
subscribing to 'cmd_vel' did not work for us. In our case, your previous commit 'cmd_vel_mux/input/teleop' worked fine.