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

Brendan Moran <Brendan.Moran@arm.com> Fri, 09 November 2018 16:02 UTC

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From: Brendan Moran <Brendan.Moran@arm.com>
To: Martin Pagel <Martin.Pagel@microsoft.com>
CC: Carsten Bormann <cabo@tzi.org>, 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 16:02:16 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/suit/xz0hJ6DXMnnMSvKP1CMKicA7DfM>
Subject: Re: [Suit] Which type of devices? CBOR "parser"
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Hi Martin,
That likely won’t be necessary with a pull parser. Let’s see how it works out.

Thanks,
Brendan

On 9 Nov 2018, at 14:50, Martin Pagel <Martin.Pagel@microsoft.com<mailto:Martin.Pagel@microsoft.com>> wrote:

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<mailto:Brendan.Moran@arm.com>>
Sent: Friday, November 9, 2018 3:17 AM
To: Carsten Bormann <cabo@tzi.org<mailto:cabo@tzi.org>>
Cc: Martin Pagel <Martin.Pagel@microsoft.com<mailto:Martin.Pagel@microsoft.com>>; Hannes Tschofenig <Hannes.Tschofenig@arm.com<mailto:Hannes.Tschofenig@arm.com>>; suit@ietf.org<mailto:suit@ietf.org>; Alexander Pelov <a@ackl.io<mailto:a@ackl.io>>; Matthias Waehlisch <m.waehlisch@fu-berlin.de<mailto: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<mailto: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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