Hi,all
I found mote(ctp+4bitle) sometimes failed to send ctp packet as no
parent is chosen, even the root is very close the mote.
The reason I found is VERY_LARGE_ETX_VALUE is set to 0xffff in
tos/lib/net/4bitle/LinkEstimatorP.nc, it is too large maybe, once
used in computeETX(), the etx is much larger than ETX_THRESHOLD for a
long time due to the EWMA algorithm. SVN r4975 make this
change(0xff-> 0xffff), anyone know the reason?
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