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<[email protected]> 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<[email protected]> 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 >>> > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
