%% You should probably cite draft-ietf-lwig-coap instead of this I-D.
@techreport{kovatsch-lwig-coap-02,
    number =    {draft-kovatsch-lwig-coap-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-kovatsch-lwig-coap/02/},
    author =    {Matthias Kovatsch and Olaf Bergmann and Esko Dijk and Xuan He and Carsten Bormann},
    title =     {{CoAP Implementation Guidance}},
    pagetotal = 16,
    year =      2014,
    month =     jan,
    day =       17,
    abstract =  {The Constrained Application Protocol (CoAP) is designed for resource- constrained nodes and networks, e.g., sensor nodes in a low-power lossy network (LLN). Yet to implement this Internet protocol on Class 1 devices (i.e., \textasciitilde{} 10 KiB of RAM and \textasciitilde{} 100 KiB of ROM) also lightweight implementation techniques are necessary. This document provides lessons learned from implementing CoAP for tiny, battery- operated networked embedded systems. The guidelines for transmission state management and developer APIs can also help with the implementation of CoAP for less constrained nodes.},
}