RFC 8824, "Static Context Header Compression (SCHC) for the Constrained Application Protocol (CoAP)", June 2021

Errata ID: 7395
Status: Rejected
Type: Technical
Publication Format(s) : TEXT, PDF
Reported By: Marco Tiloca
Date Reported: 2023-03-19
Rejected by: Eric Vyncke
Date Rejected: 2023-08-03

Section 7.1 says:

SCHC compression reduces the header, sending only the Type, a mapped
code, and the least significant bits of the Message ID (9 bits in the
example above).

It should say:

SCHC compression reduces the header, sending only a mapped Type (and
only for uplink messages), a mapped code, and the least significant
bits of the Message ID (9 bits in the example above).

Notes:

As per the discussed rule from Table 3, the Type is also omitted if it is CON for downlink messages.
--VERIFIER NOTES--
The author/WG wrote:
"In this case we are making a difference between the index of the
matching-list sent in Type and the mapped index used for Code that belongs
to the RFC7252 section 12.1 IANA values."
in https://mailarchive.ietf.org/arch/msg/lp-wan/s7EO2F4JUPHUyFLc3Qr-5RnwNZE/

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