%% You should probably cite rfc7641 instead of this I-D.
@techreport{ietf-core-observe-06,
    number =    {draft-ietf-core-observe-06},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-core-observe/06/},
    author =    {Klaus Hartke},
    title =     {{Observing Resources in CoAP}},
    pagetotal = 27,
    year =      2012,
    month =     sep,
    day =       6,
    abstract =  {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 a server to replicate a resource state to interested clients. The protocol follows a best-effort approach when transmitting new resource states to a client, and provides eventual consistency between the state observed by the client and the actual resource state.},
}