The IoT is a widespread network system where the infrastructure is basically formed by the device to the device communication technology and the physical objects in an environment are communicated with each other or with wider systems. The meaning of the object concept in the IoT varies according to the technology used in the terminal devices. Those can either be simple sensors or RFID devices or complex intelligent systems and multiple sensors connected to them. The IoT consists of end devices connected with different network topologies and protocols.