[Tinyos-devel] Testing FTSP

[Branislav Kusy]

Omprakash Gnawali wrote:
> I wanted to see if the current version of FTSP in rc3 works well in a
> multihop environment. I modified TestFtsp to send the return value of
> call GlobalTime.local2Global(&rxTimestamp) through UART every 4s and
> plotted the output - time on x-axis and node id on y-axis and (x,y) is
> plotted if the return value is 1 suggesting FTSP is out of sync. If
> FTSP is working well, we expect very few points on this graph. The
> experiment was done on channel 25 on a 56-node TelosB testbed.
> 
> Here are the results:
> Default tx power: http://enl.usc.edu/~om_p/net2/test-ftsp/ftsp_result1.gif
> tx power = 14: http://enl.usc.edu/~om_p/net2/test-ftsp/ftsp_result2.gif
> 
> Is FTSP out of sync too often or not too far off the expected result?
could i see the full log? (even better, if you could log the whole 
test_ftsp_msg_t struct over uart)

one reason can be (depending on how many hops you have) too high resync 
frequency, currently set to 3 seconds (TIMESYNC_RATE in 
TestFtsp/Makefile). we used ~30 sec for large scale tests.

brano