Enabling interoperability in the internet of things: A OSGi semantic information broker implementation

Semantic Web technologies act as an interoperability glue among different formats, protocols and platforms, providing a uniform vision of heterogeneous devices and services in the Internet of Things (IoT). Semantic Web technologies can be applied to a broad range of application contexts (i.e., industrial automation, automotive, health care, defense, finance, smart cities) involving heterogeneous actors (i.e., end users, communities, public authorities, enterprises). Smart-M3 is a semantic publish-subscribe software architecture conceived to merge the Semantic Web and the IoT domains. It is based on a core component (SIB, Semantic Information Broker) where data is stored as RDF graphs. Software agents update and retrieve data, and subscribe to data store changes, using SPARQL. This article describes a OSGi SIB implementation extended with a new primitive named persistent SPARQL update. Performance of the OSGi SIB has been evaluated and compared with the reference C implementation. Eventually, a first porting on Android is presented.