thanks, Razvan Musaloiu-E,
then what is the usage of CC2420_NO_ACKNOWLEDGEMENTS?
If a sender transmit a packet, then the receiver will reply with a ACK.
So what interface the sender will use to receive the ACK?
and how does the sender process the ACK message?
Do you know some sample code about this flag? could you please share it with me?
thanks
"Razvan Musaloiu-E." <[EMAIL PROTECTED]> 写道： Hi!
On Wed, 24 Sep 2008, Renee Azhen wrote:
> Does this flag(CC2420_NO_ACKNOWLEDGEMENTS) is used by mac/link layer?
> if the CC2420_NO_ACKNOWLEDGEMENTS was set, then no ack will be sent by
> receiver, so the receive.Done event will always return true?
You are talking about AMSend.sendDone? AMSend.sendDone will not return a
fail even if the packet is not acked. To check for that you have to use
the wasAcked from the PacketAcknowledgements interface
(PacketAcknowledgements.nc from tos/interfaces). You also need to use the
requestAck from it before doing a AMSend.send of the packet.
--
Razvan ME
> Tony O'Donovan
> When a sender tranmits a message to a receiver the receiver can send an
> acknowledgment (ACK) message. The purpose of the ACK is to let the
> sender know the message was successfully received. If the
> CC2420_NO_ACKNOWLEDGEMENTS option is set the receiver does not send an
> ACK when it receives a message.
>
>
> --- Renee Azhen wrote:
>
>> hi, all,
>> I am using the collection protocol, and found that
>> if I use:
>> CFLAGS += -DCC2420_NO_ACKNOWLEDGEMENTS
>> CFLAGS += -DCC2420_NO_ADDRESS_RECOGNITION
>> in the app makfile, network almost failed, it can't
>> deliver any packet.
>>
>> So is there anyone know what is the usage of that
>> line in Makefile??
>>
>> thanks
>> Sam
>>
>>
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