Hi Michael, Thanks a lot for the reply. I have tried on platforms imote2 and shimmer2 both of which use CC2420 radio stack. The sending nodes are sampling at 50 Hz and I have to used a TDMA scheme among the nodes within the 20 ms (ie 50 Hz) so that the sending of messages is interleaved. I am sending samples individually and based on the sampling rate and number of sending nodes i am sending 150 packets per second. Have you tried serial port on imote2 or shimmer2 platforms?
Regards, John On Wed, Mar 10, 2010 at 3:47 PM, Michael Schippling <[email protected]> wrote: > You don't mention what mote platform you are using, > but my early measurements indicate about 20 and 200 > packets per second rate on the mica2 and micaz, > respectively. So if you are on a "high speed radio" > platform like the 'Z and are transmitting every > sample individually, you may be pushing the limit > and just loosing messages. No matter what you will > lose a few so you should be prepared for it. > > You can try turning on the message ACK behavior > and checking in your sendDone()'s, keeping a serial > number to track what you actually get, or aggregating > your samples so as to have less message overhead. > > MS > > John Paul wrote: >> >> Hi, >> >> In my project I have a base station and 3 source nodes which are >> sampling at 50 Hz and each of these source nodes are sending data >> (less than TOSH_DATA_LENGTH) to the base station through single hop >> communication. The base station is connected to PC and which ever >> radio packet it receives it sends to the serial port. The base station >> implementation is the application "BaseStation" in tinyos 2.x under >> "apps". I am writing the serial packet payload in a file using >> java.However, I am losing some of the serial packets. I have been >> struggling on this problem for a while. Could anyone please help me to >> resolve this issue. >> >> Regards, >> John >> _______________________________________________ >> 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
