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Content replication to many destinations is a common use case in the Internetof Things (IoT). The deployment of IP multicast has proven inefficient, though,due to its lack of layer-2 support by common IoT radio technologies and itssynchronous end-to-end transmission, which is highly susceptible tointerference. Information-centric networking (ICN) introduced hop-wisemulti-party dissemination of cacheable content, which has proven valuable inparticular for low-power lossy networking regimes. Even NDN, however, the mostprominent ICN protocol, suffers from a lack of deployment.  In this paper, we explore how multiparty content distribution in aninformation-centric Web of Things (WoT) can be built on CoAP. We augment theCoAP proxy by request aggregation and response replication functions, whichtogether with proxy caches enable asynchronous group communication. In afurther step, we integrate content object security with OSCORE into the CoAPmulticast proxy system, which enables ubiquitous caching of certified authenticcontent. In our evaluation, we compare NDN with different deployment models ofCoAP, including our data-centric approach in realistic testbed experiments. Ourfindings indicate that multiparty content distribution based on CoAP proxiesperforms equally well as NDN, while remaining fully compatible with theestablished IoT protocol world of CoAP on the Internet.

Networking Group Content: RESTful Multiparty Access to a Data-centric Web of Things