%% You should probably cite rfc8824 instead of this I-D.
@techreport{ietf-lpwan-coap-static-context-hc-04,
    number =    {draft-ietf-lpwan-coap-static-context-hc-04},
    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-lpwan-coap-static-context-hc/04/},
    author =    {Ana Minaburo and Laurent Toutain and Ricardo Andreasen},
    title =     {{LPWAN Static Context Header Compression (SCHC) for CoAP}},
    pagetotal = 23,
    year =      2018,
    month =     jul,
    day =       2,
    abstract =  {This draft defines the way SCHC header compression can be applied to CoAP headers. CoAP header structure differs from IPv6 and UDP protocols since the CoAP use a flexible header with a variable number of options themself of a variable length. Another important difference is the asymmetry in the header format used in request and response messages. Most of the compression mechanisms have been introduced in {[}I-D.ietf-lpwan-ipv6-static-context-hc{]}, this document explains how to use the SCHC compression for CoAP.},
}