On Dec 12, 2006, at 11:30 AM, David Moss wrote:
Hi Phil -
The way LPL works is through continuous retransmissions of a
message for the duration of a receive check period. These
retransmissions are invisible to the application layer - so from
the app layer, it looks like you send a single message and get a
single sendDone back. LPL doesn't guarantee reliability - that
would be up to a higher layer like you pointed out, like a
collection library or a message transport layer.
If the collection library attempts to send to a LPL receiver, the
LPL layer itself will cause the message to be rebroadcasted
continuously for at least the full duration of the receiver's
receive check, so the duty cycling receiver can hear it. If the
duty cycling receiver doesn't get the message, the higher layers
like collection would know this by using PacketAcknowledgements,
and be able to choose a different destination immediately.
Ah, that makes sense. I misunderstood the message, assuming that
"resend" meant above LPL. Whoops.
Phil
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