[net2-wg] Collection

[Philip Levis]

On Wed, 2006-06-14 at 13:55, Rodrigo Fonseca wrote:
> I added an interface -- CollectionDebug -- which allows for easy
> calling of debug messages. I have implemented one of the commands in
> UARTDebugSenderP, and am finishing the others. Should make sending
> these msgs much easier.
> 
> Rodrigo


Here's a dump of some packets. This is a network of two telos (one is a
tree root):

00 FF FF 0C 22 15 01 00 01 AA 00 00 01 00 0A 00 00 FE
00 FF FF 07 22 00 01 00 00 64 00 01 FE
00 FF FF 07 22 00 01 00 01 AB 00 00 FE
00 FF FF 07 22 00 01 00 00 65 00 01 FE
00 FF FF 07 22 00 01 00 01 AC 00 00 FE
00 FF FF 0C 22 15 01 00 00 66 00 00 00 00 00 00 01 FE

The six byte is the AM type: 00 is link estimation, 15 is routing
beacon. The 01 following the AM type is the control byte, showing that
every packet has a single link estimation entry in it. The next two
bytes show the data-link address: 00 00 is the root, 00 01 is the child.

E.g:
*** AM Header
00 FF FF : sent to broadcast
0C : 12 bytes long
22 : AM group 0x22 (66)
15 : AM type 15 (routing beacon)
*** LE Header
01 : One link estimation entry
00 01: Sent by node 0  
AA : sequence number
*** Routing beacon
00 00 : parent
01 : hop count
00 0A : metric (10, or ETX of 1)
*** Link estimation entry
00 00 : link estimate of node 0 -> node 1 (me)
FE : it's great

(Note that there are no data packets.)

Basically, what these messages show is that we have routes, but no data
packets are being sent.

Phil