From the course: IoT Foundations: Operating Systems Fundamentals

OS characteristics for IoT

From the course: IoT Foundations: Operating Systems Fundamentals

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OS characteristics for IoT

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- [Instructor] Let's look at some high-level user requirements and how they're linked to the OS characteristics. First, efficient management of complex tasks and the system resources is essential. This directly impacts overall system performance. In real-time environments, especially safety critical or mission critical applications, tasks must be excluded within stricter timing constraints to ensure correct and reliable operation. Second, IoT devices often need to support a wide range of hardware and the software platforms. Whether it is integrating custom components, adding sensors, or upgrading hardware, the operating system should offer strong portability and extensibility to ensure easy adaptation. Third, IoT devices must support different network connectivity options. They may operate across different network environments ranging from personal area, local area, to wide area networks. Connectivity can also extend to the edge or cloud. And OS for IoT should be designed with these diverse connectivity needs in mind. Additionally, IoT devices often require low power consumption and a compact OS footprint. This is essential for ensuring efficient performance at the device level. Given that most IoT devices are small in size and memory, the OS must occupy minimal space without compromising performance. Security is a fundamental requirement for IoT devices supported by both software and hardware. Just as important is stability since these devices often need to run continuously for month or even years without interruption. Lastly, we need to make product development easier to conduct. These user requirements can be mapped to some characteristics of an OS suitable for IoT systems. In summary, these characteristics include resource and power management, footprint, extensibility and modularity, portability, toolchain and support, and the licensing. While each OS may prioritize these characteristics differently, let's examine them one by one. Resource and the power management. In IoT systems, efficient management of computing resources and the tasks is crucial for achieving optimal performance. This includes power-efficient operation of kernel tasks and the support for power management features that work seamlessly with hardware. For instance, an OS might provide an interface to trigger sleep mode on a processor. Footprint refers to the mount of memory or storage space an operating system occupies. For devices with limited resources, the OS needs to be small and efficient, but it should also be flexible, allowing you to add, modify, or remove functions as required. Extensibility refers to the operating system's ability to add new features and integrate third-party software frameworks and the libraries. Modularity means the OS supports a flexible modular architecture, making it easier to extend and customize the software. These can be achieved through the design approaches like the microkernel architecture or through modular software design at the code level where the components are loosely coupled and independently configurable. Portability means an OS should be portable, allowing us to use a variety of processors, hardware platforms, and I/O devices such as radio modules and sensors. Toolchain and support. The toolchain includes compiler and debugger support, along with the out of the box vendor support and ongoing assistance from both vendors and the user community. Strong support typically reflects a healthy OS ecosystem. Licensing is an important factor when considering the cost of IoT product development and commercialization. Many open-source embedded OSs comes with permissive licenses such as Apache 2.0, MIT, and BSD. Copyleft licenses, like the new GPL, require source code disclosure and other conditions. For details about the open-source licenses, you may check the website, choosealicense.com. For safety critical applications, some operating systems offer certified versions under different licensing models. Typically at a cost. Note that this was a high-level overview. For your specific application, you may prioritize characteristics not listed here along with other factors when selecting an OS.

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