The purpose of the ISO/IEC 29182 series is to- provide guidance to facilitate the design and development of sensor networks,- improve interoperability of sensor networks, and- make sensor network components plug-and-play, so that it becomes fairly easy to add/remove sensor nodes to/from an existing sensor network.ISO/IEC 29182-4 presents models for the entities that enable sensor network applications and services according to the Sensor Network Reference Architecture (SNRA).