tcpdump mailing list archives
Re: Public Release of Z-Wave G.9959 TAP Specification
From: Chris Brandson via tcpdump-workers <tcpdump-workers () lists tcpdump org>
Date: Tue, 6 Dec 2022 07:55:06 -0800
--- Begin Message --- From: Chris Brandson <chris.brandson () gmail com>
Date: Tue, 6 Dec 2022 07:55:06 -0800
Hello Denis, I agree with all of your suggestions, have made the changes and pushed to the repo.* Page 7: "Length is a minimum of 4 octets and must be a multiple of 4. The addition of new TLVs does not and must not require incrementing the version number." -- this definition automatically creates a problem space on the receiving/reading end of this encoding because slightly more than 75% of all possible length values are invalid by definition. The classic solution would be not to include the first 4 octets into the length, and to count in multiples of 4, this way any length value would be valid, free of underflows and better consumable by simple parsers such as BPF bytecode.The length is now the number of 4 octet (32-bit) words omitting the header.* Page 8: "Z-Wave PHY Payload" -- is this the PPDU from Figure A.7 of G.9959 2015/01, starting from "preamble sequence"?This was an unfortunate mistake on my part. The intention was to specify the MPDU (not PPDU). This has been corrected and mapping to G.9959 added.* Page 9: "length - number of octets for type in value field (not including padding)" -- this definition looks better, but in the next three TLV diagrams the length does include the T and the L.Lengths in the diagrams have been corrected.* Page 10: If the list of region code points is a copy/subset of an external registry, it would help to give an exact reference. Ditto bit rate code points. Clearly there is some relation with tables A.1 and A.2 from G.9959 2015/01.References have need added. Thank-you for your feedback. Regards, + Chris Brandson
--- End Message ---
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Current thread:
- Re: Public Release of Z-Wave G.9959 TAP Specification Chris Brandson via tcpdump-workers (Dec 06)
- Re: Public Release of Z-Wave G.9959 TAP Specification Denis Ovsienko via tcpdump-workers (Dec 08)