RIOT is a real-time multi-threading operating system that supports a range of devices that are typically found in the Internet of Things (IoT): 8-bit, 16-bit and 32-bit microcontrollers.
RIOT is based on the following design principles: energy-efficiency, real-time capabilities, small memory footprint, modularity, and uniform API access, independent of the underlying hardware (this API offers partial POSIX compliance).
RIOT is developed by an international open-source community that is independent of specific vendors (e.g. similarly to the Linux community). RIOT is licensed with LGPLv2.1, a copyleft license that fosters indirect business models around the free open-source software platform provided by RIOT, e.g. it is possible to link closed-source code with the LGPL code.
RIOT is based on a microkernel architecture, and provides features including, but not limited to:
- a preemptive, tickless scheduler with priorities
- flexible memory management
- high resolution, long-term timers
- support 100+ boards based on AVR, MSP430, ESP8266, MIPS, ARM7 and ARM Cortex-M
- the native port allows to run RIOT as-is on Linux, BSD, and MacOS. Multiple instances of RIOT running on a single machine can also be interconnected via a simple virtual Ethernet bridge
- 6LoWPAN (RFC4944, RFC6282, and RFC6775)
- RPL (storing mode, P2P mode)
- initial support for SUIT firmware updates
- USB CDC-ACM serial communication
- complete rewrite of TI CC110x radio driver
- initial support for IPv6 fragmentation
- DTLS support in the sock networking stack
- complete blockwise messaging for gcoap and nanocoap
- as always, bug fixes and documentation updates
About 460 pull requests, composed of 950 commits, have been merged since the last release, and about 60 issues have been solved. 57 people contributed with code in 105 days. Approximately 2000 files have been touched with 129000 insertions and 25000 deletions.