Hi om_p,
I have the same doubt, so I set the basestation ID to -1 for trasparent
bridging (could I send a custumized ACK??) and ID>= 0 for packets generator,
and I have added a check in Send.send (CC2420CsmaP.nc,
if( call AMPacket.address() != -1)
header->src = call AMPacket.address(); )
I agree with you, but I think that the instruction (line 274) in BaseStationP
is misleading.
Thanks, Salvo
> On Thu, Mar 6, 2008 at 4:15 PM, Salvo Fiduccia <[EMAIL PROTECTED]> wrote:
> > Hi all,
> >
> > in SerialActiveMessageP there is a note in the AMSend.send command:
> > "Do not set the source address or group, as doing so
> > prevents transparent bridging"
> >
> > I think this is correct, but the same don't happen in the send command of
> > ActiveMessageC: in the micaz implementation, in CC2420csmaP, the Send.send
> > command sets the header source field with the node id, so these istructions
> > (BaseStationP) don't have effect:
> >
> > task void radioSendTask() {
> > .............
> > 273 call RadioPacket.clear(msg);
> > 274 call RadioAMPacket.setSource(msg, source);
> > 275
> > 276 if (call RadioSend.send[id](addr, msg, len)....
> > ....
> > }
> >
>
> I am not sure if there is a straight forward resolution to this topic.
> The question is if the BaseStation application should provide for
> transparent serial to radio bridging. Some people use a BaseStation
> and some PC application to generate packets. One example is how Tenet
> uses CTP - a PC software generates a CTP beacon, encapsulates it as a
> serial packet and sends it to the base station. I believe there were
> some protocols like that in the core distribution of TinyOS 1.x as
> well. Our experience is if the bridging is not transparent, then it is
> easy to make an error - program the BaseStation as node y and have the
> PC software generate packet as node x and you have a problem when the
> children of the root start building the neighbor and routing tables.
> On the other hand, a transparent bridging would make node id for the
> BaseStation not useful at all which prevents from using ACKs for
> unicast transmissions - so how useful is it?
>
> - om_p
>
_______________________________________________
Tinyos-help mailing list
Tinyos-help@millennium.berkeley.edu
https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
