Hello, Just to share this remark and just to collaborate on solving this common problem..
So, -- During my experiment, I found that bad packet always come from a particular node which is for example the node on COMx. Even by adding some delays as you suggest, the problem still persists :( -- Also an other remark, the node placement on the USB hub is *dependent* to bad packet appearance or not. Welcome for your participation on this Thread. Best regards, Maissa Ben_j 2009/7/19 Maisa Ben Jamaa <[email protected]> > Hi, > > OK, So the problem is about short delay between the transmissions. > Grateful for your answer. > > Best regards, > Maissa Ben Jamaâ > > 2009/7/19 Michael Schippling <[email protected]> > > I found the "retraction period" to be significant in my >> reliability testing that I've previously ref'ed. Things >> were greatly improved by putting a small delay between the >> reception of a message and the sending of a new message >> at the host end. I don't know if this a host effect or >> slow switching from receive to xmit on the radio end. >> It was much more pronounced on the mica2's than the 'Z's. >> I didn't do any extensive testing with the telosb. >> >> MS >> >> Maisa Ben Jamaa wrote: >> >>> Hi, >>> Umm, so this can be like a collision that was being happening over the >>> serial communication channel. >>> Thank you Faisal >>> >>> 2009/7/18 Faisal Aslam <[email protected] <mailto: >>> [email protected]>> >>> >>> Hi, >>> >>> I also have this error if I send packet from mote too fast (Usually >>> in a loop). If you can have a small delay between packets being send >>> from mote then you will have lesser bad packets errors. >>> >>> best regards, >>> Faisal >>> >>> Maisa Ben Jamaa wrote: >>> >>> Hi, >>> >>> If tinyos reports a lot of bad packet messages during a pc and >>> sensor mote >>> communication based on an usb connection, so in your opinion why >>> this, >>> is happening? >>> >>> Precisely, what causes that the *packet crc* is different from >>> the computed one? >>> (more details can be found in Packetizer.java file) >>> >>> Best regards, >>> Maissa Ben Jamaa >>> _______________________________________________ >>> Tinyos-help mailing list >>> [email protected] >>> <mailto:[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 >>> >> >
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