[Tinyos-help] Re: Questions on CTP functioning

[Pedro Almeida]

Hello, Omprakash!

The messages are basically like this:

7E 45 00 FF FF 00 00 13 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 53 63 7E

In the 0's there should be the CTP header and data structures (they get
correctly populated after 14 receives from the network).

Thanks,

Pedro

On 7/16/07, Omprakash Gnawali <gnawali at usc.edu> wrote:
>
>
> If you post those messages you get on the serial port and if I
> recognize them, I will tell you what they are.
>
> - om_p
>
> >
> > Hello, Omprakash, thank you for your answer!
> >
> > I have commented everything related to collection debug and debug
> overall
> > code, but something might have slipped, it's possible.
> > Even if they are debug messages, why do you think it takes that amount
> of
> > messages to start receiving actual correct frames? Can it be by any
> chance a
> > way to measure the time taken to establish a tree? If they're debug, and
> if
> > the tree forms instantly (or close), why the wait?
> >
> > Thank you!
> >
> > Pedro
> >
> > On 7/14/07, Omprakash Gnawali <gnawali at usc.edu> wrote:
> > >
> > >
> > > >
> > > > So let me redo the questions:
> > > >
> > > > How does the P bit enabling works? Who/what causes it and why?
> > >
> > > To add to what Phil said, the current implementation sets PULL bit
> > > like this:
> > >
> > > ...
> > >         else if (routeInfo.parent == INVALID_ADDR) {
> > >             beaconMsg->etx = routeInfo.etx;
> > >             beaconMsg->options |= CTP_OPT_PULL;
> > >         } else {
> > > ...
> > >
> > > (When a node does not have a parent, for example, when a node boots
> > > up.)
> > >
> > >
> > >
> > > > The question about the 14 data messages remain.
> > > >
> > >
> > > Did you disable the debug messages? Those messages on the serial
> > > interface are probably debug messages. CTP should not send bogus
> > > messages on the serial port - if the tree is built, it will send data
> > > messages, otherwise there will be no data messages to forward. Debug
> > > messages are independent of the data messages and if they are enabled,
> > > not only the base station, but all the motes should send some debug
> > > messages on the serial port.
> > >
> > > - om_p
> > >
> >
>
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