%% You should probably cite rfc7641 instead of this I-D.
@techreport{ietf-core-observe-10,
    number =    {draft-ietf-core-observe-10},
    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/10/},
    author =    {Klaus Hartke},
    title =     {{Observing Resources in CoAP}},
    pagetotal = 31,
    year =      2013,
    month =     sep,
    day =       23,
    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 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.},
}