[Tinyos-devel] Testing FTSP

[Omprakash Gnawali]

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?

Thanks.

- om_p