Hello Guy, >>>> The Family/Address/IR field contains 3-bits of family code, 2-bits of >>>> address mode, 2-bits of IR (infrared) routing, and 1-bit unused. >>>> The 8 Legrand NITOO families are 000=CAD Filaire, 001=TopDog, 010=CAD RF, >>>> 011=CAD PLC, 100=CAD IR, 101=DLM, 111=escape, and 111=DLM Bootloader). >>>> This document only describes the DLM family. >>> >>> Are the fields following the Family/Address/IR field dependent on the >>> family code? Or can the rest of the packet, with the possible exception of >>> the opcode and payload, be parsed the same way regardless of the family >>> code? >> >> Yes, the fields following the Family code are dependent on the Family code. > > I.e., following the Family/Address/IR field, other families might not have > the Sequence ID, Source and Destination MAC addresses, Opcode, and Payload > Length followed by Payload?
Yes, that is correct. > Is the checksum family-code independent or might packets with other family > codes not have it (or calculate the checksum differently)? I presume the checksum is family-code dependent (although by luck it might not be). > What I meant was that you said "The 8 Legrand NITOO families are ..." - is > this a protocol used only by Legrand, so that those are the only family codes > used, or are there other vendors who might have their own set of families and > family codes, different from the Legrand ones? This protocol is only used by Legrand and their subsidiary companies (i.e. WattStopper), as far as I know. >> The LRC does not cover the Dongle Code or Packet Delay or Preamble. > > I.e., it checksums packet data starting at the Family/Address/IR field and > continuing through the end of the Payload field? Yes, that is correct. Best Regards, Steve -- http://steve.kargs.net/ _______________________________________________ tcpdump-workers mailing list tcpdump-workers@lists.tcpdump.org https://lists.sandelman.ca/mailman/listinfo/tcpdump-workers
