{
  "draft": "draft-ietf-core-observe-16",
  "doc_id": "RFC7641",
  "title": "Observing Resources in the Constrained Application Protocol (CoAP)",
  "authors": [
    "K. Hartke"
  ],
  "format": [
    "TEXT",
    "HTML"
  ],
  "page_count": "30",
  "pub_status": "PROPOSED STANDARD",
  "status": "PROPOSED STANDARD",
  "source": "Constrained RESTful Environments",
  "abstract": "The Constrained Application Protocol (CoAP) is a RESTful application protocol for constrained nodes and networks.  The state of a resource on a CoAP server can change over time.  This document specifies a simple protocol extension for CoAP that enables CoAP clients to \"observe\" resources, i.e., to retrieve a representation of a resource and keep this representation updated by the server over a period of time.  The protocol follows a best-effort approach for sending new representations to clients and provides eventual consistency between the state observed by each client and the actual resource state at the server.",
  "pub_date": "September 2015",
  "keywords": [
    "Smart Objects",
    "Internet of Things",
    "IoT",
    "REST"
  ],
  "obsoletes": [],
  "obsoleted_by": [],
  "updates": [],
  "updated_by": [
    "RFC8323"
  ],
  "see_also": [],
  "doi": "10.17487/RFC7641",
  "errata_url": null
}