addenda...In v1.x, if you have enableAck()ed, sendDone() will wait for
the ACK or timeout and set the msgptr->ack phantom-phield to TRUE or
FALSE as appropriate. I assume it's the same in 2.x...
MS
Philip Levis wrote:
On Jul 16, 2006, at 2:57 PM, Avinash Sridharan wrote:
Hi All,
I had a question on the return value of the send interface. The
signal sendDone (called after the send command on the AMSend is
called) returns an error value. The error value is SUCCESS when the
packet is sent on the air. It returns a failure if the stack was not
able to transmit the packet (even after multiple backoffs).
My question is that whenever a packet is sent the stack waits for the
ACK before signalling a SUCCESS. If the ACK is not received received
than does it return a FAILURE or since the packet has been
successfully sent after a certain period of time it just returns
SUCCESS ?
The error_t on sendDone denotes sending, not reception success. There
are situations when a stack can accept a send but then not be able to
service it (e.g., you turn off the radio before it can send). In these
situations, it signals sendDone with a FAIL.
You can request and check for packet acknowledgments with the
PacketAcknowledgments interface.
Phil
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