Ok, I did that. I know the byte 80 is in fact my defined AM type. Now it is still an open question for me why does the CBC-MAC override the last byte in the packet?
Best, Filip Jurnecka On Tue, 05 Feb 2013 14:58:18 +0100, wasif masood <[email protected]> wrote: > Checkout the CC2420 datasheet for details regarding the 802.15.4 header > strucutre. > > On Tue, Feb 5, 2013 at 2:17 PM, Filip Jurnečka > <[email protected]>wrote: > >> Hi there. >> >> I wonder how the packet delimiters work. Say I have two packets. If sent >> normally, the BS app displays them as: >> 00 FF FF 00 01 00 22 80 >> 00 FF FF 00 01 01 22 80 00 >> >> Now I don't know what the first 00 is, but the next FFFF is the >> broadcast >> address, the 0001 should be my address, the next 00/01 defines the >> length >> of the packet data. What is the 22? What is the 80? Is it the delimiter >> of >> the data to follow? Obviously, the last 00 is the data sent. >> >> Now it gets more interesting, if I enable the in-line CBC-MAC with 4 >> bytes >> output, I get the following. >> 00 FF FF 00 01 03 22 B7 E2 4C FB >> 00 FF FF 00 01 04 22 80 71 36 57 EE >> >> The question is mainly about the fact that the output is overriding the >> last byte of the unauthenticated message, i.e. the delimiter or the >> payload byte. Any ideas why and how to fix it? >> >> Best regards, >> Filip Jurnecka >> _______________________________________________ >> Tinyos-help mailing list >> [email protected] >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> > > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
