Packet collision should be handled in the lower level radio code, so you don't need to worry about it. Messages can be lost due to noise, distance, or other interference, but it doesn't sound like that's the problem if it works the second time around.
Maybe you need to wait a while before first sending your messages? Put a second or two of Timer delay in the initiating mica-A after power up? Perhaps you can post your code so we can have a look. MS firas obeidat wrote: > HI I am working on micaz,its for my 4th year project,and I encountered > this problem that even my profs cant solve it... > I am trying to send packets between mica z on the mica z radio in a > specific order so for ex: mica A send a packet to Mica B.. > once Mica B receive this packet it sends a packet specifically to Mica > C,then Mica C receive it and send to Mica D. > Mica A->Mica B->Mica C->Mica D > but sometimes ESPECIALLY when I turn them all at once packet collusion > occurs I think.. > so what happens is that when Mica A send to Mica B.Mica B receive it and > sends But mica C and D doesn't receive it even though Mica B is telling > me that its sending.. > I think this might be related to interference between Mica A & B since > they are sending over the radio using the same frequency for all > signals, am not sure that's why I am really in need for an explanation.. > the WEIRD part is if I turn mica A off then On again then they ALL > WORK!! I REALLY DONT KN! OW WHY THIS FIXES THE PROBLEM > > > ------------------------------------------------------------------------ > > _______________________________________________ > Tinyos-help mailing list > Tinyos-help@millennium.berkeley.edu > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help _______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
