[Tinyos-help] Question about lost of packets with MultiHop.

[Conor Todd]

Perhaps if you use the QueuedReceive mechanism, you'll not loose as many
packets?  Or, if you really want to be sure you're getting the packets and
you don't want to touch the radio stack, try using the RadioCoordinator
interface, which allows you to be notified every time a byte is recieved.

        - Conor


On 7/25/06, Munaretto, Daniel <munaretto at docomolab-euro.com> wrote:
>
> So what you mean is in tinyos-1.x is impossible to bypass this problem,
> isn'it?
> Or if there is a solution in 1.x, in my project would be really important,
> should you explain it?
> Thanks very much,
> Cheers
> Daniele
>
>         -----Original Message-----
>         From: Philip Levis [mailto:pal at cs.stanford.edu]
>         Sent: Tue 7/25/2006 7:33 AM
>         To: José Ulloa
>         Cc: Tinyos-help at Millennium.Berkeley.EDU
>         Subject: Re: [Tinyos-help] Question about lost of packets with
> MultiHop.
>
>
>
>         On Jul 24, 2006, at 1:21 PM, José Ulloa wrote:
>
>         > Hi, we are working with a network with six or more hops, and
>         > tinyos-1.x. We have detected a lost of packet in a node, after
>         > receiving the packet and sending the corresponding ACK.
>         > ¿is this posible because the radio had two packet in the RXFIFO
> in
>         > the moment of read?
>         > I understand, when tinyos-1.x reads the first packet, the second
>         > will be descarted by the call of flushRXFIFO from the
> CC2420RadioM
>         > component. ¿is this really happening? ¿someone knows a solution
> for
>         > this?
>
>         Yes, this is really happening. It's a fairly nasty issue in the
> 1.x
>         stack. The TinyOS 2.0 stack doesn't have this issue; it keeps
> track
>         of packets in the FIFO and spools them out one by one. If a packet
>         can't fit in the FIFO, then the radio doesn't acknowledge it.
>
>         Phil
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