%% You should probably cite draft-ietf-lwig-coap instead of this I-D.
@techreport{kovatsch-lwig-coap-00,
    number =    {draft-kovatsch-lwig-coap-00},
    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/00/},
    author =    {Matthias Kovatsch and Olaf Bergmann and Angelo Castellani and Esko Dijk and Carsten Bormann},
    title =     {{CoAP Implementation Guidance}},
    pagetotal = 16,
    year =      2013,
    month =     jul,
    day =       1,
    abstract =  {The Constrained Application Protocol (CoAP) is designed for resource- constrained nodes and networks, e.g., sensor nodes in low-power lossy networks (LLNs). Still, to implement this Internet protocol on Class 1 devices, i.e., \textasciitilde{} 10 KiB of RAM and \textasciitilde{} 100 KiB of ROM, 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.},
}