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Re: [core] ALPN "coap" for DTLS

Christian Amsüss <christian@amsuess.com> Fri, 15 March 2024 08:28 UTC

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Date: Fri, 15 Mar 2024 09:28:07 +0100
From: Christian Amsüss <christian@amsuess.com>
To: Michael Richardson <mcr+ietf@sandelman.ca>, core@ietf.org, draft-ietf-anima-constrained-voucher@ietf.org
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Subject: Re: [core] ALPN "coap" for DTLS
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Hello group, hello Michael,

On Fri, Feb 23, 2024 at 04:28:34PM -0500, Michael Richardson wrote:
> I wish we had done this three years ago :-)

As they say, the second best time is today:

The ALPN "co" has been added to the ALPN registry[1] in the TLS
extensions group.

As planned, this does not change anything about how CoAP-over-DTLS uses
it (7252: not at all), but someone explains how DTLS 1.3 is used with
CoAP (AIU, anima-constrained-voucher does that), that may be a welcome
opportunity to embrace ALPNs.

Best regards
Christian

[1]: https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml#alpn-protocol-ids

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