Categorization of IoT and IIoT Systems

Nowadays, the term IoT (Internet of Things) is becoming more and more common and we can say that we are living through a revolution in technology. Many manufacturers and service providers are using this term to promote their products and services, so I think it is important to explore, review and present the literature in this article. The topic can be divided into two broad categories. I will examine communication solutions for devices such as Bluetooth, Wi-Fi, Zigbee and Matter. I will also discuss M2M (Machine-to-Machine) and IIoT (Industrial Internet of Things). Furthermore, I will detail the clustering of general IoT technologies and the short-range technologies emerging in IoT and IIoT.