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Re: [Lake] Protocol runs

Göran Selander <goran.selander@ericsson.com> Wed, 08 February 2023 16:50 UTC

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From: Göran Selander <goran.selander@ericsson.com>
To: Carsten Bormann <cabo@tzi.org>
CC: "lake@ietf.org" <lake@ietf.org>
Thread-Topic: [Lake] Protocol runs
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Date: Wed, 08 Feb 2023 16:50:22 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lake/ABFwAdFGU-YG5PjB37nAUEVvs2w>
Subject: Re: [Lake] Protocol runs
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From: Carsten Bormann <cabo@tzi.org>
Date: Wednesday, 8 February 2023 at 15:35
On 2023-02-08, at 10:06, Göran Selander <goran.selander@ericsson.com> wrote:
>
> The underlying transport in the recipient endpoint knows, either by means of other data fields, e.g. the CoAP Token received by a CoAP client, or else with the use of an explicit identifier prepended to the EDHOC message, see section 3.4.1 about message correlation:

OK.  So a broken exchange needs to be followed by one with a new connection identifier?
I’m not sure I understand how the initial dummy (CBOR »true«) connection identifier works when multiple restarts may be active.

[GS] What connection identifiers are used (incl. timeouts, recycling, etc.) is determined by the application. EDHOC only transports C_I in message_1 and C_R in message_2, for the *receiving* endpoint to use, for example by the transport to prepend to subsequent messages for correlation, as previously discussed. Since C_R is not known when message_1 is sent, an initial dummy CBOR `true` is used to indicate a new session.

Does it make sense?

Göran

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