Hi Mikael,
the shorter (30 bytes) messages are beacons.
This message type is also defined in
C:\cygwin\opt\moteiv\tos\lib\MultiHopLQI\MultiHop.h
as BeaconMsg and is sent every MHOP_BEACON_PERIOD to spread some
informations
about the network. (see ...\moteiv\tos\lib\MultiHopLQI\MultiHopLQIM.nc for
usage)
The other (to many) bytes is the data-element of the MultiHop message, which
contains the payload. In case of Delta the payload can be a BeconMsg or
DeltaMsg.
(TOS_Msg.data->TOS_MHopMsg.data->BeaconMsg or
TOS_Msg.data->TOS_MHopMsg.data->DeltaMsg )
So the message format for Delta application is:
Byte TOS_Msg
01 length
02 fcfhi
03 fcflo
04 dsn
05-06 destpan
07-08 addr
09 type
10 group
/*----- the next group of elements is stored in
TOS_Msg.data ---------------*/
11-12 sourceaddr
13-14 originaddr
15-16 seqno
17-18 originseqno
19 ttl
20 id
/*----- the next group of elements is stored in TOS_MHopMsg.data --------*/
DeltaMsg BeaconMsg
21 seqno parent
22 seqno parent
23 seqno cost
24 seqno cost
25 reading hopcount
26 reading hopcount
27 parent timestamp
28 parent timestamp
29 neighborsize timestamp
30 retransmissions timestamp
31 neighbors
32 neighbors
34 neighbors
35 neighbors
36 neighbors
37 neighbors
38 quality
39 quality
40 quality
41 quality
42 quality
43 quality
Regards,
OLE
----- Original Message -----
From: "Mikael Ifversen" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Sunday, November 26, 2006 3:24 PM
Subject: [Tinyos-help] Boomerang -Delta packet structure
Hi,
I'm monitoring the data packets from the Delta app in boomerang with
Listen.java. Most packets are of length 20bytes, then a few shorter
packets of 14bytes are popping up.
1. What is the purpose of the shorter packet?
2. Can anyone clarify the packet structure below, since it seems that
there are a couple of bytes to many?
The struct of the standard header is defined here:
C:\cygwin\opt\moteiv\tos\lib\CC2420Radio\AM.h - 11bytes long where the
11th byte is the data, meaning only the first 10bytes constitutes the
header.
The struct of the MultihopMsg is defined here:
C:\cygwin\opt\moteiv\tos\lib\MultiHopLQI\MultiHop.h - also 11bytes long
and is consistent with Multihop message of 10bytes found at:
http://www.moteiv.com/support/tmote-message-format.html
20 01 08 0C FF FF FF FF 08 7D 01 00 01 00 0B 00 0B 00 FC 21 0A 00 00 00 5E
0B FF
FF 03 00 FF FF FF FF FF FF FF 7F FF 7F FF 7F packet length: 42
20 01 08 0D FF FF FF FF 08 7D 01 00 01 00 0C 00 0C 00 FC 21 0B 00 00 00 5F
0B FF
FF 03 00 FF FF FF FF FF FF FF 7F FF 7F FF 7F packet length: 42
14 01 08 0E FF FF FF FF 07 7D 01 00 01 00 0D 00 0D 00 01 00 FF FF FE FF FF
00 00
00 00 00 packet length: 30
20 01 08 0F FF FF FF FF 08 7D 01 00 01 00 0E 00 0E 00 FC 21 0C 00 00 00 5E
0B FF
FF 03 00 FF FF FF FF FF FF FF 7F FF 7F FF 7F packet length: 42.
So what is exactly the rest of the package?
Thanks,
Mikael
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