This is an open-source IoT operating system initiated by Chinese developers, featuring excellent scalability and extensibility. It can run on a minimal kernel on an ARM Cortex-M0 chip, to a medium-sized ARM Cortex-M3/4/7 system, and even on different processor architectures such as multi-core 64-bit ARM Cortex-A, MIPS32/64. It also provides a rich set of components and software packages that can help developers quickly build embedded system products.