Smart-M3 is an open source middleware solution originally released by Nokia as a prototype reference infrastructure to support context-aware ontology-driven smart applications. This paper proposes a renewedSmart-M3 Semantic Information Broker implementation with increased performance and usability levels. In the proposed solution many features have been added or modified, preserving compatibility with the previous release. The major changes are related to the subscription mechanism, the RDF store and the supported encodings for information representation and query. SPARQL query language replaces Wilbur. This paper enlightens the analysis carried out on the original implementation and discusses the choices made to increase its maturity level. The work done is a step forward towards a stable and efficient open interoperability platform for the emerging market of smart space based services.