Welcome to this Contiki course and the hands-on session！ The purpose of the course is threefold： to understand Contiki， to see how it can be used to write systemspapers， and to meet others who are using Contiki. Thesenotes and the slides presented during the course should

　　be saved for future reference.Contiki is a state-of-the-art， open source operatingsystem for sensor networks and other networked embedded devices ［3］。 Contiki was the first operatingsystem for sensor networks to provide TCP/IP communication （with the uIP stack） ［1， 6］， loadable modules ［2］， threading on top of its event-driven kernel ［3］，protothreads ［5］， protocol-independent radio networking （with the Rime stack） ［7］， cross-layer network simulation （with Cooja） ［8］， and software-based power pro-filing ［4］。 Recent features include a networked shell and

　　the memory efficient flash-based Coffee file system. Inthis course， we use the Rime stack to communicate in anetwork of Tmote Sky boards and the network shell tointeract with the network.These notes describe the practical， hands-on sessionwith Tmote Sky boards and the Cooja simulator. Thepurpose of this session is to get experience with howto use Contiki with actual hardware and in simulation.We hope that this experience will be of help when later

　　working with Contik