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Re: [Suit] Which type of devices? CBOR "parser"

Martin Pagel <Martin.Pagel@microsoft.com> Fri, 09 November 2018 14:50 UTC

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From: Martin Pagel <Martin.Pagel@microsoft.com>
To: Brendan Moran <Brendan.Moran@arm.com>, Carsten Bormann <cabo@tzi.org>
CC: Hannes Tschofenig <Hannes.Tschofenig@arm.com>, "suit@ietf.org" <suit@ietf.org>, Alexander Pelov <a@ackl.io>, Matthias Waehlisch <m.waehlisch@fu-berlin.de>
Thread-Topic: [Suit] Which type of devices? CBOR "parser"
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Date: Fri, 09 Nov 2018 14:50:31 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/suit/ogKGtsijsrNJsTIkDeMLgDUROjA>
Subject: Re: [Suit] Which type of devices? CBOR "parser"
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Carsten, 
I don't understand...  
With CBOR I need a Receive Buffer to load the manifest in CBOR format and then apply the parser to store it somewhere else in MCU-native format (such as a regular Int without the CBOR flags at the beginning). With the binary format you can skip that and load it straight in MCU-native format and work on it. 

Brendan, 
I assume your parser will be smaller, but would still use a Receive Buffer, correct?

Martin

-----Original Message-----
From: Brendan Moran <Brendan.Moran@arm.com> 
Sent: Friday, November 9, 2018 3:17 AM
To: Carsten Bormann <cabo@tzi.org>
Cc: Martin Pagel <Martin.Pagel@microsoft.com>; Hannes Tschofenig <Hannes.Tschofenig@arm.com>; suit@ietf.org; Alexander Pelov <a@ackl.io>; Matthias Waehlisch <m.waehlisch@fu-berlin.de>
Subject: Re: [Suit] Which type of devices? CBOR "parser"

I agree, Carsten. I am working on a specialised parser (similar in nature to the one you described above) for a minimal instance of the draft-moran-suit-manifest and hope to share my results shortly.

Best regards,
Brendan

> On 9 Nov 2018, at 07:34, Carsten Bormann <cabo@tzi.org> wrote:
>
>> But you still need a buffer to receive the CBOR manifest and transform it into a format which the application (update agent, status tracker, communicator…) can use, which means you approximately need twice the memory plus some "transformation" code.
>
> You don’t need another format.  Why not work on the CBOR right away?
>
> Grüße, Carsten
>
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