Edit [Andrew Shen]: Launch the nodes using the launchfile JuniorTutorial.launch:

roslauch JuniorTutorial JuniorTutorial.launch

This is a ROS & Git introductory challenge for the interested Juniors to work their way through.

Before Juniors can begin work on the autonomous car we need to develop some basic skills with

• ROS
• GIT
• C++ and python

This challenge aims to help you do that.

The idea is that after doing this you will be able to contribute here: https://github.com/MURDriverless

ROS is the Robot Operating System, and is the core middleware that we will be using for the driverless car. Knowing how to use it is critical.

ROS works on a publisher subscriber model that is built around a node type network. Nodes (which is where our code will run) can either subscribe (recieve messages from) or publish (push messages to) a topic. Other nodes can do the same and communication between nodes is achieved by this message passing mechanism.

Look into the tutorials here https://wiki.ros.org/ROS/Tutorials

These should give you the info you need to get this challenge going.

Git is the defacto version control tool for developers all over the world. If you ever write code professionally in a collaborative environment you will encounter it. MUR Driverless uses it for collaboration and code management.

(This project wont make much sense until youve done the tutorials)

You need to create 3 ROS nodes and have them publish random integers between 1 and 1000 to 2 different topics.

The 3rd topic will subscribe to both of them and every loop iteration it will print the larger integer published by the two topics to console.

If the smaller number is prime, it will publish that instead, if they are both prime it will publish the larger number instead.

After you have written a ros package you need to open a pull request on this repo. I recommend you start by forking this repo first.

You may be unfamilar with a number of the problems posed here. Feel free to reach out to myself on slack or discord, but also check in with other autonomous juniors.