I've not tried either of those platforms. Like I said, I'd instrument the messages and/or user ACKs to see where they are going. I doubt it's the serial line that dropping them though.
MS John Paul wrote: > 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
