The number of IoT (Internet of Things) devices increases rapidly day by day. According to Gartner Institute, 8.4 billion connected things will be in use worldwide already this year. It means an increase of more than 30 percent comparing to the previous year. The IT research firms expect that this number will be much bigger and can result from 21 billion (Gartner) to 37 billion (Cisco) by 2020! To imagine how our world is going…