Hi Jacob,
I believe Packet.clear() is supposed to clear the packet header and
metadata only. There was a discussion some time ago.
Mike
Jacob Sorber wrote:
> So, the problem is that Packet.clear does different things in
> SerialActiveMessageP and XE1205SendReceiveP. In the first it just
> clears the headers, in the later it clears the entire message_t. So,
> instead of resetting the headers as is intended in BaseStation, it
> blows away the payload it is trying to forward.
>
> Nice. What are the semantics for the Packet.clear command supposed to
> be? From the comments in Packet.nc (tos/interfaces) it seems that the
> XE1205SendReceiveP has it right and BaseStation is using clear
> incorrectly, but since it isn't completely explicit, I guess it could
> go either way.
>
> I'll hack something up for myself, but I am interested to know what
> the "right" way to fix it is.
>
> Thanks,
>
> Jacob
>
> On Tue, Aug 4, 2009 at 4:22 PM, Jacob Sorber<jacob.sor...@gmail.com> wrote:
>> Ok, so the problem seems to be the BaseStation app. Relaying packets
>> from Radio to UART works fine, but UART to Radio seems to lose the
>> payload. I'm not yet sure why.
>>
>> Jacob
>>
>> On Tue, Aug 4, 2009 at 10:45 AM, Jacob Sorber<jacob.sor...@gmail.com> wrote:
>>> Just curious if anyone has seen this behavior. I have been using
>>> tosthreads with tinynodes a bit lately and I noticed that when I use
>>> BlockingAMReceiverC, receive returns SUCCESS when a packet is sent to
>>> the mote, but the packet payload seems to be all zeros instead of the
>>> data I'm sending. It may be a problem with my code (which I will
>>> continue to explore), but since tosthreads is relatively new, I
>>> figured it might also be a bug.
>>>
>>> If anyone has seen this, or has any ideas, please let me know.
>>>
>>> Also, I just noticed the following code in BlockingAMReceiverImplP.nc.
>>> Line 12 (146 in the file) caught my attention. Can you copy a
>>> message_t struct like that? [*(p->msg) = *m]
>>>
>>> 1: event message_t* Receive.receive[uint8_t am_id](message_t* m,
>>> void* payload, uint8_t len) {
>>> 2: syscall_t* s;
>>> 3: params_t* p;
>>>
>>> 4: if(blockForAny == TRUE)
>>> 5: s = call SystemCallQueue.find(&am_queue, INVALID_ID);
>>> 6: else
>>> 7: s = call SystemCallQueue.find(&am_queue, am_id);
>>> 8: if(s == NULL) return m;
>>>
>>> 9: p = s->params;
>>> 10: if( (p->error == EBUSY) ) {
>>> 11: call Timer.stop[s->thread->id]();
>>> 12: *(p->msg) = *m; //Can you copy a struct like this?
>>> 13: p->error = SUCCESS;
>>> 14: call SystemCall.finish(s);
>>> 15: }
>>> 16: return m;
>>> 17: }
>>>
>>>
>>> Thanks,
>>> Jacob
>>>
>
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