Code and slides for lab1 on the basic concepts on Contiki-OS are available. You can download the material cloning the repo lab1:
git clone git@github.com:lab-anaws/lab1-2015.git
You can also browse the code from https://github.com/lab-anaws/lab1-2015
Code is made to be compiled within the ‘examples/z1’ folder of the Contiki toolchain.