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Re: [core] CoAP over TCP

Hannes Tschofenig <hannes.tschofenig@gmx.net> Mon, 10 November 2014 23:33 UTC

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Date: Tue, 11 Nov 2014 00:33:03 +0100
From: Hannes Tschofenig <hannes.tschofenig@gmx.net>
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To: Carsten Bormann <cabo@tzi.org>, "core@ietf.org WG" <core@ietf.org>
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Subject: Re: [core] CoAP over TCP
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Hi Carsten,

thanks for the write-up.

On 10/24/2014 06:11 PM, Carsten Bormann wrote:
> In alternative transports, I believe we have three hot topics:
> 
> 1) General issues.  draft-silverajan-core-coap-alternative-transports
> is a good basis for this and we will do the call for adoption soon.
> 
> 2) CoAP over SMS.  This is also related to the question of DTLS over
> SMS.  We have a good draft for the former, which is mostly waiting
> for (1).  draft-fossati-dtls-over-gsm-sms merits some discussion.

Thanks for mentioning draft-fossati-dtls-over-gsm-sms; I am happy to
briefly describe what we had been working on.

> 
> 3) CoAP over TCP.  draft-bormann-core-coap-tcp-01 is a summary of the
> design choices. draft-tschofenig-core-coap-tcp-tls selects one option
> without explaining why.

draft-tschofenig-core-coap-tcp-tls describes what we (ARM and Zebra)
have implemented and deployed.

Our use case is firewall traversal in enterprise networks. Our goal was
to use our existing CoAP over UDP implementation. Doing optimizations to
CoAP when we already add all the complexity of TCP didn't seem
worthwhile to us.

Ciao
Hannes

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