In the communication industry it is very common to have standardized technology. Ethernet, TCP/IP, GSM and others have proven the following advantages as standard protocols over proprietary ones: compatibility and interoperability makes the technology more attractive for end users by its independence from a single vendor; in contrast to proprietary solutions, standard protocols are open and available for developers and most are available free of charge; openness and a large number of participants involved in the standard development process increases technology reliability and safety compared to one developed by a single company; and organizations responsible for standard specifications are constantly upgrading their standards according to market needs. This process is intensified by the experience of large number of companies participating in development. To achieve these advantages, it is sufficient to standardize communication protocols to be used, while allowing custom hardware platforms and applications. Such an approach is most common in network standards. The most promising and popular standards for wireless sensor networks are IEEE 802.15.4, specified by the IEEE, and ZigBee which was developed by the ZigBee Alliance.