There's another aspect to consider here as well: uC-to-uC serial communications. Although I haven't looked into it much deeper, I suspect TinyOS's asymmetric serial acknowledgments could be playing a part in the failures we've seen in preliminary attempts to get uC's to talk through their serial stacks.
-David -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Philip Levis Sent: Wednesday, February 20, 2008 9:40 AM To: Kaan Tuna Cc: tinyos-help@millennium.berkeley.edu Subject: Re: [Tinyos-help] serial send acknowledgement 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 _______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help _______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
