RIOT is a nano operating system for the Internet of Things. While requiring as low as 1,5kB of RAM and 5kB or ROM, RIOT offers real time and energy efficiency capabilities, as well as a single API (partially POSIX compliant) across heterogeneous 8-bit, 16-bit and 32-bit low-hardware. This API is developer-friendly in that it enables multi-threading, standard C and C++ application programming and the use of standard debugging tools (which was not possible so far for embedded programming). On top of this, RIOT includes several network stacks, such as a standard IPv6/6LoWPAN stack and a content-centric network (CCN) stack. RIOT will be demonstrated powering heterogeneous IoT hardware based on low-power microcontrollers and radio transceivers, in a home automation scenario interconnecting devices running a simple application and either standard IPv6/6LoWPAN protocols, or CCN (or dual stack).