Subject: [core] 🔔 WGLC of draft-ietf-core-stateless-01

From: Carsten Bormann <[email-masked]>
Date: Wed, 26 Jun 2019 16:14:56 +0200

This is a Working Group last call on

https://tools.ietf.org/html/draft-ietf-core-stateless-01

The WGLC will end in exactly 336 hours so we can discuss the outcome at the CoRE WG Interim meeting on 2019-07–10.  Please indicate your position in a message to the CoRE mailing list ([email-masked]) or, exceptionally, to the chairs ([email-masked]).

Please find my chair’s review below; I believe the items raised there can be discussed during the WGLC alongside the concerns of other WG members.

Grüße, Carsten

Chair’s review of draft-ietf-core-stateless-01

# Major

Discovery is currently focused on whether the server supports extended token lengths at all.  Given that the maximum extended token is rather large for a constrained environment, the client may be interested to find out how large tokens can be for this server.  With CSM, this would be trivial (change empty option value to an uint value).  With trial-and-error, this leaves the client with binary search (probably along the lines of the token sizes it actually can make use of).

# Minor

Section 3.3 suddenly starts to talk about authentication tags and freshness indicators; this might require additional explanation (in particular since there are BCP 14 keywords in these paragraphs).  Section 4.2.1 has some implementation guidelines that could possibly be expanded to cover this.