Hi everyone,
Please help me with the following questions regarding CTP, specifically for
forwarding engine component "CtpForwardingEngineP.nc".
1) In the event handler
event void SubSend.sendDone(message_t* msg, error_t error) {
..
else if (error != SUCCESS) {
..
else if (ackPending && !call PacketAcknowledgements.wasAcked(msg)) {
..
}
What is the difference between the two conditions? Aren't both of them
suggesting failed delivery by means of absence of ACK? What scenarios would
cause "error != SUCCESS" exactly, possibly besides no ACK?
2) In the same event handler
event void SubSend.sendDone(message_t* msg, error_t error) {
..
else if (qe->client < CLIENT_COUNT) {
..
call SendQueue.dequeue();
..
}
else if (call MessagePool.size() < call MessagePool.maxSize()) {
..
call SentCache.insert(qe->msg);
call SendQueue.dequeue();
..
It shows forwarded packets from other nodes are cached after successfully
transmitted, for duplicate suppression. However, packets generated
locally (qe->client
< CLIENT_COUNT) are not cached. Since these two kind of packets share the
same send queue, why are they treated differently as to caching?
Your attention is appreciated.
--
-Xiaohui Liu
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