%% You should probably cite draft-ietf-core-too-many-reqs instead of this I-D.
@techreport{keranen-core-too-many-reqs-01,
    number =    {draft-keranen-core-too-many-reqs-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-keranen-core-too-many-reqs/01/},
    author =    {Ari Keränen},
    title =     {{Too Many Requests Response Code for the Constrained Application Protocol}},
    pagetotal = 4,
    year =      2018,
    month =     mar,
    day =       19,
    abstract =  {A Constrained Application Protocol (CoAP) server can experience temporary overload because one or more clients are sending requests to the server at a higher rate than the server is capable or willing to handle. This document defines a new CoAP Response Code for a server to indicate that a client should reduce the rate of requests.},
}