IoT is an emerging concept that involves a larger and larger number of heterogeneous smart everyday-life objects. They enable a large scope of new applications that require all these objects to communicate, to interact, to share data and processes. All these objects have popped up from there to there, using their own communication means, OS or language. A key open issue to realize the full capacity of such concept is thus interoperability. How to make them fully compliant? This conference will present some current research and open issues in interoperability in IoT, ranging from virtualization to standardization.