IoT is growing significantly as consumers, businesses, and governments are recognizing the benefits of connecting inert devices to the internet. In fact, the number of connected objects is projected to reach 28 billion by 2020. Simply put IoT covers autonomous devices that are connected with each other over a network. It means that not only computers can be a part of IoT, but also all sorts of sensors and embedded devices, such as Arduino or Raspberry Pi. A ‘thing’ in IoT can be anything that is big enough to contain some – mostly wireless – transceiver and have its own unique method of identification (e.g. an IP address). It could be as small as a watch or as big as an entire city: eyeglasses, household goods or traffic lights. Even insects, farm animals or humans can be equipped with some sensors and transmitters, which look after them and monitor their location or health.