I noticed the 802.15.4 spec has test vectors for the crypto that show
the byte order of the address.
See 802.15.4-2011 spec [1]
Annex C, Section C.2.1.1
source address 0xacde480000000001 is represented in a packet as.
08 D0 84 21 43 01 00 00 00 00 48 DE AC || 02 05 00 00 00 || 55 CF 00 00
51 52 53 54 22 3B C1 EC 84 1A
B5 53.
- Simon
[1] - https://standards.ieee.org/getieee802/download/802.15.4-2011.pdf
On 29/05/15 09:31, Alexander Aring wrote:
On Fri, May 29, 2015 at 11:08:21AM +0300, Lennert Buytenhek wrote:
...
That the PSDU should send in little endian is specified in section:
10.2.3 Bit-to-symbol mapping
"Each octet of the PPDU is processed through the modulation and spreading
functions, as illustrated in Figure 69, sequentially, beginning with the
Preamble field and ending with the last octet of the PSDU. Within each octet,
the least significant symbol (b0,b1,b2,b3) is processed first and the most
significant symbol (b4,b5,b6,b7) is processed second."
This is about bit ordering, not byte ordering -- and it's consistent
with what I have been saying before -- it explains why the I/G bit
is transmitted first, even though it is the 0x01 bit in the first
address byte.
I need to lookup more information about this.
I know this not an argument, but let us think about if we change the byte
order there. This means that SAM/DAM decompression/compression BIT 11 is wrong [0].
(The remaining 64 bits are computed from the encapsulating header (e.g.,
802.15.4 or IPv6 source address)...)
That also means that wireshark, contiki, etc. will all do currently the wrong
byte ordering at L2. I currently can't believe that and we should really
clarifying this issue before we change this. Otherwise we are
incompatible with the whole 802.15.4 IoT used software outside.
- Alex
[0] https://tools.ietf.org/html/rfc6282#section-3.1.1
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