[Tinyos-help] Measuring end to end delay

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Hello everyone.

I want to measure end to end delay using sky tmote.

I will sychronise nodes, then source node sends local time to destination
node.

So, destination can get end to end delay using difference local time
in receiver and received time value.

Is this proper way to measure end to end delay?


When nodes send packet, I add local time (4 bytes) on packet using
TimerC.LocalTime().

But when i checked the local time at the receiver, the local time was
sometimes decreased.

For instance, the local time (4 bytes)  change from [ 22 00  BD 00 ]  to
 [22 00 02 01].

Could somebody explain this one?

How can i change these 4 byte to second ? Do they use tick unit (32768tick =
1sec)?


Thanks your very much.

Best regards.
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