Nowadays, Internet has evolved into a platform that reshapes modern life and removes borders between real, social and cyber worlds. Internet of Things (IoT) is an emerging paradigm and a cutting edge technology that harnesses a network of embedded, interconnected objects (sensors, actuators, tags or mobile devices) in order to collect various types of information at anytime and anywhere. These devices can be used for building different complex smart environments [1], such as smart homes [2][3], smart classrooms [4], smart offices [5], smart factories [6], smart cities [7], intelligent transportation systems [8], smart power grids [9] or smart e-government. Further, the networks of devices are based on advanced Internet standards. IoT implies seamless integration of numerous types of devices into existing Internet infrastructure. Smart environments can be customized according to users’ needs and preferences which are suitable for automating these environments. Internet of things solutions often encompass integration with cloud-based systems and services [7]: Infrastructure as a service (IaaS), Platform as a service (PaaS) and Software as a service (SaaS)
