Requirements specification - second release

D2.3.b The first release of this deliverable will specify the requirements for BIG IoT according to the overall project goal and vision, as well as for the use cases defined in Task 2.2. As such, this deliverable will set the scope, the functionalities, and the features of the overall architecture (i.e., the BIG IoT API, the semantic framework, and the marketplace) and provides the guidelines for the technology development in WP3, WP4 and WP5. The second release (D2.3.b) will extend D2.3.a with a refined set of the requirements based on the experiences and results gained with the first version of the BIG IoT technologies and use case implementation. D2.3.b contributes to MS3.