On Fri, May 9, 2008 at 7:27 AM, Nahr ... <[EMAIL PROTECTED]> wrote:
> Hi,
> I am steel facing bizarre things.
>
> How could a receiver receive more than the packet sent ??
>
> /********************************************************/
> void sendMessage() {
>
> if (call Send.send(&packet, sizeof(EasyCollectionMsg)) != SUCCESS) {
> failedSend();
> }
> else {
> sendBusy = TRUE;
> printf("I am node n %d I sent a msg \n",TOS_NODE_ID);
> }
> /********************************************************/
> event message_t* Receive.receive(message_t* msg, void* payload, uint8_t len)
> {
>
> printf("I am node n %d I receive a msg \n",TOS_NODE_ID);
>
> }
>
> I calculate the number of (I am node n %d I sent a msg) I found that its
> number is less
> than
> I am node n %d I receive a msg \n
>
>
> How is that ???????????????
>
When a transmitter sends a packet and the receiver receives it
successfully but the ack gets lost, there is no way for the
transmitter to know if it was the packet or the ack that was lost.
Then the transmitter retransmits the packet. This retransmission could
result in multiple copies of packets at the receiver.
- om_p
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