[6lo] Warren Kumari's No Objection on draft-ietf-6lo-nfc-13: (with COMMENT)
Warren Kumari via Datatracker <noreply@ietf.org> Thu, 14 March 2019 08:24 UTC
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From: Warren Kumari via Datatracker <noreply@ietf.org>
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Cc: draft-ietf-6lo-nfc@ietf.org, Carles Gomez <carlesgo@entel.upc.edu>, Samita Chakrabarti <samitac.ietf@gmail.com>, 6lo-chairs@ietf.org, carlesgo@entel.upc.edu, 6lo@ietf.org, bill.wu@huawei.com
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Date: Thu, 14 Mar 2019 01:24:10 -0700
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Subject: [6lo] Warren Kumari's No Objection on draft-ietf-6lo-nfc-13: (with COMMENT)
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Warren Kumari has entered the following ballot position for draft-ietf-6lo-nfc-13: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-6lo-nfc/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- I apologize - I've read the document, but it doesn't seem like it contains enough information to allow a full implementation. The document keeps talking about the fact that the range is limited to 10cm, and makes some security assertions from this - from the little that I understand about this technology (and I wasn't able to follow all the references), ISO 15693 tags using NDEF are now part of the NFC specification - these work up to 1M. I have no idea if this protocol is supposed to work over that, but if so, 1M is greater than 10cm. Also, I see you did respond to the OpsDir review ( https://datatracker.ietf.org/doc/review-ietf-6lo-nfc-12-opsdir-lc-wu-2018-12-19/ -- thank you very much, Qin) , but there are things in these which don't seem fully addressed. As an example, Qin asked: ---- Section 3.4 said ” the MTU size in NFC LLCP MUST be calculated from the MIU value as follows: MIU = 128 + MIUX.” Can you provide formula to calculate MTU from MIU? Not clear how MTU is related to MIU? --- You responded: "YH >> Actually, MIU is the same as MTU. Specifications in NFC forum use 'MIU', and we use 'MTU'. But these two has the same meaning." I read version 13 of this document and had the exact same question -- how do I calculate the MTU from the MIU? If they really are the same thing (which I'm not sure they are), the document should state that, so readers can more easily implement.
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