On Wed, Nov 19, 2008 at 08:22:09PM +0100, <Matteo>:
~> You say: "quality of the link A<-->B changed, so it's time to rediscover new
~> optimal routes ... ETP send..." ok I undestand it, but I can't undestand how
~> you discover that the wireless link from A to B is changed in quality.....
~> (Maybe you launch an ETP packet every X time?)
Nope, we use the Radar.
If I recall correctly the Radar isn't described in details in any .pdf. However
it is very simple:
The radar sends in broadcast a bouquet of BQUET_NUM packets and waits
for the reply of the alive nodes. It then recollects the replies and builds
a small statistic.
By watching the previous statistics, it can deduces if a change occurred or
not. If it is, one of the following events is fired:
'NEIGH_NEW', 'NEIGH_DELETED', 'NEIGH_REM_CHGED'
In this way, the other modules of pyntk will be noticed.
A radar is fired periodically by Radar.run(), which is started as a
microthread.
Note: the current statistic is based on the RTT (Round Trip Time)
of the packets. However, more refined way can be used and shall be
implemented. See NTK_RFC 0002 http://lab.dyne.org/Ntk_bandwidth_measurement
--
:wq!
"I don't know nothing" The One Who reached the Thinking Matter '.'
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