The increasing number of automated systems using the global network for management has led to the need to search for new technologies for transmitting data from various sensors over long distances with minimal energy consumption. Today, there are several similar technologies on the market that claim to be the world standard in the concept of the Internet of things, but none of them has yet been studied in detail from the point of view of security. This article is devoted to the analysis of one of the most common protocols in order to identify potential vulnerabilities.