I. Introduction
The Internet of Things (IoT) technology is one of the fastest developing technologies in our days. A number of smart devices used in everyday life is growing at a high rate [1]. A use of IoT devices is reflected in many areas of life, e.g., they are used in smart shopping [2] and agro-industry tasks [3]. Another prospective area is an employment of various unmanned aerial vehicles (UAVs) [4] for civilian purposes, e.g., for monitoring a road traffic state [5], and military purposes [6].