Short description of the HyperCat & SenML Standards
The combination of the standards HyperCat and SenML are being used for developing secure and interoperable IoT for industry and cities. HyperCat is an open, lightweight JSON-based hypermedia catalogue format for exposing collections of URIs. Each HyperCat catalogue may expose any number of URIs, each with any number of RDF-like triple statements about it. It manages the static information about IoT assets including the asset description, metadata and links for observations for specific time periods. The time-dependent observations for each asset are represented using the SenML format. SenML is a data model to represent observations in the JSON format. In a way, the combination of HyperCat and SenML corresponds to OGC SensorML and O & M.
The Role of HyperCat & SenML in SDDI
In the district London QEOP, one of the partners Intel UK is working primarily on the HyperCat & SenML Standards. The weather stations set up and operated by Intel UK are based on these standards. The sensors measure in total 15 properties in the park including temperature, humidity, wind speed etc.
More details about the implementations can be found here.
Format Specification
Specification documents
HyperCat: http://www.hypercat.io/
SenML: https://www.ietf.org/archive/id/draft-jennings-senml-10.txt