[Tinyos-help] A possible bug in BaseStation application, TinyOS 2.1.0

[Janos Sallai]

Packet.clear() does not clear the packet payload, only the control
fields. Your problem was probably something else.

What platform do you use?

Janos

On Thu, Jun 18, 2009 at 12:58 AM, Dongzhen Piao<parkurm at gmail.com> wrote:
> Hi all,
>
> I was writing a simple program to send commands from a base station to
> sensor motes. I defined several fields in the command packet, and set them
> to predefined command value before sending the packet.
>
> But when the sensor motes received the command message, all the fields are
> 0. After a long period of debugging, I finally found that the problem
> happens in the standard BaseStation application shipped with TinyOS 2.1.0.
>
> Here's the function in BaseStationP.nc file, where the problem occurs:
>
>   task void radioSendTask() {
>     uint8_t len;
>     am_id_t id;
>     am_addr_t addr,source;
>     message_t* msg;
>
>     atomic
>       if (radioIn == radioOut && !radioFull)
>     {
>       radioBusy = FALSE;
>       return;
>     }
>
>     msg = radioQueue[radioOut];
>     len = call UartPacket.payloadLength(msg);
>     addr = call UartAMPacket.destination(msg);
>     source = call UartAMPacket.source(msg);
>     id = call UartAMPacket.type(msg);
>
>     call RadioPacket.clear(msg);
>     call RadioAMPacket.setSource(msg, source);
>
>     if (call RadioSend.send[id](addr, msg, len) == SUCCESS)
>       call Leds.led0Toggle();
>     else
>       {
>     failBlink();
>     post radioSendTask();
>       }
>   }
>
> In the line bolded, the function clears all fields in the packet received
> from UART, and forwards it to the radio. The behaviour is strangely set to
> clear the packet, which is not desirable in such a "bridging" application.
>
> After commenting out the line, my program worked just fine.
>
> Does anybody have some idea about this? Is this a bug, or is this some
> behaviour desired by the application author?
>
> Thanks.
>
> Dongzhen Piao
>
>
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