On Feb 20, 2008, at 7:37 AM, Kaan Tuna wrote:
Hello all,
When we send data over the serial port, how can we verify that the
receiver (PC, terminal...) succesfully received the packet?
Do we need a modification in the application layer (ie in the code,
SerialSend.SendDone ?)? Is there any implementation of this kind?
Yes. You need a modification in the application layer.
This has been a point of discussion on TEP 113. Currently, TinyOS
acknowledges packets from the PC, but the PC does not acknowledge
packets from TinyOS. The protocol would allow such a thing -- just
send PROTO_PACKET_ACK to the PC -- but the serial stack
implementation doesn't support it. On one hand, it would be nice if
you could request ACKs; on the other, I'm worried about code bloat.
Right now the serial stack is about 3.5-4K of code all together, and
adding acks would probably add another 1K or so. Given that it's an
infrequent request, yet many applications run into the code size
limits on telos-family motes, I'm leery of adding support. Writing an
alternative stack that supports acks isn't appealing, either, as that
means maintaining parallel implementations (and I already maintain
too much).
Phil
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