In TEP 126 (
http://tinyos.cvs.sourceforge.net/*checkout*/tinyos/tinyos-2.x/doc/html/tep126.html),
for the PacketLink layer, there is a command called "setRetryDelay."  It is
described as follows:
"The second command, setRetryDelay(..), specifies the amount of delay in
milliseconds between each retry."

Is specified delay

1) the time from the start of one transmission try to the start of the next
transmission try?

or

2) the time from the end of one transmission try to the start of the next
transmission try?

In other words, when does the delay start counting?  Does it start at the
beginning of the first transmission try or the end of the first transmission
try?  I have a transmission that takes a relatively long time to complete,
so I would like to know how the setRetryDelay is interpreted so that I don't
end up overlapping the first and second transmission (which I assume could
happen if the first case above (1) is true and I set the retry delay shorter
than the time it takes to transmit one message).

Thank you.
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