[Tinyos-help] Link layer acknowledgement in CTP

[Kirak Hong]

Oh, this was silly question. I forgot the requestAck(). However, it's still tricky to use this Acknowledgement mechanism since my application is using UART0. It seems the radio cannot send acknowledgement if the shared USART0 is set to UART0. 

Is this right?

Kirak

----- Original Message -----
From: Kirak Hong <hokira at EECS.Berkeley.EDU>
Date: Sunday, December 21, 2008 6:23 pm
Subject: Re: [Tinyos-help] Link layer acknowledgement in CTP
To: Omprakash Gnawali <gnawali at usc.edu>
Cc: tinyos-help at millennium.berkeley.edu

> I just found that the wasAcked() function always returns FALSE if I don't use PacketLink layer. Actually, I thought that the wasAcked() function would work proper unless NOACKNOWLEDGEMENT is defined.
> 
> Do you know how to turn on the acknowledgement without PacketLink layer? I'm using telosb mote.
> 
> 
> 
> ----- Original Message -----
> From: Omprakash Gnawali <gnawali at usc.edu>
> Date: Sunday, December 21, 2008 5:07 pm
> Subject: Re: [Tinyos-help] Link layer acknowledgement in CTP
> To: Kirak Hong <hokira at EECS.Berkeley.EDU>
> Cc: tinyos-help at millennium.berkeley.edu
> 
> > On Sun, Dec 21, 2008 at 4:53 PM, Kirak Hong 
> > <hokira at eecs.berkeley.edu> wrote:
> > > Hello guys,
> > >
> > >
> > > I'm using CTP and found some redundant transmission problem. I 
> > think it
> > > retransmits redundant packets because 
> > PacketAcknowledgements.wasAcked is not
> > > working well. On transmitter side, wasAcked() in
> > > CtpForwardingEngineP.nc:SubSend.sendDone() sometimes returns 
> > FALSE although
> > > the receiver received a packet.
> > >
> > >
> > > Does anybody have an idea?
> > >
> > 
> > This sounds like lost ack.
> > 
> > - om_p > _______________________________________________
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