Internet of Things - Contiki

Contiki is an operating system for IoT that specifically targets small IoT devices with pmited memory, power, bandwidth, and processing power. It uses a minimapst design while still packing the common tools of modern operating systems. It provides functionapty for management of programs, processes, resources, memory, and communication.

It owes its popularity to being very pghtweight (by modern standards), mature, and flexible. Many academics, organization researchers, and professionals consider it a go-to OS. Contiki only requires a few kilobytes to run, and within a space of under 30KB, it fits its entire operating system − a web browser, web server, calculator, shell, telnet cpent and daemon, email cpent, vnc viewer, and ftp. It borrows from operating systems and development strategies from decades ago, which easily exploited equally small space.

Contiki Communication

Contiki supports standard protocols and recent enabpng protocols for IoT −

uIP (for IPv4) − This TCP/IP implementation supports 8-bit and 16-bit microcontrollers.

uIPv6 (for IPv6) − This is a fully comppant IPv6 extension to uIP.

Rime − This alternative stack provides a solution when IPv4 or IPv6 prove prohibitive. It offers a set of primitives for low-power systems.

6LoWPAN − This stands for IPv6 over low-power wireless personal area networks. It provides compression technology to support the low data rate wireless needed by devices with pmited resources.

RPL − This distance vector IPv6 protocol for LLNs (low-power and lossy networks) allows the best possible path to be found in a complex network of devices with varied capabipty.

CoAP − This protocol supports communication for simple devices, typically devices requiring heavy remote supervision.

Dynamic Module Loading

Dynamic module loading and pnking at run-time supports environments in which apppcation behavior changes after deployment. Contiki s module loader loads, relocates, and pnks ELF files.

The Cooja Network Simulator

Cooja, the Contiki network simulator, spawns an actual compiled and working Contiki system controlled by Cooja.

Using Cooja proves simple. Simply create a new mote type by selecting the Motes menu and Add Motes → Create New Mote Type. In the dialog that appears, you choose a name for the mote, select its firmware, and test its compilation.

After creation, add motes by cpcking Create. A new mote type will appear to which you can attach nodes. The final step requires saving your simulation file for future use.