On Wed, Jun 25, 2008 at 7:09 AM, Gaurav Chandwani <[EMAIL PROTECTED]> wrote: > Hi All, > ... > I saw a strange behaviour using SerialForwarder - When the application > is running for some hours, sometimes, i dont receive messages from a > particular node for some minutes and then it comes back again. Its > reproduced many times. > > Has anybody seen this kind of behaviour ? > Since MHO is stable, so there should be a problem at my end but I am > not able to find where.
If there is no viable path between the nodes and the root, CTP won't be able to deliver packets. Have you considered that possibility? > Since the nodes can reach root node directly, they will send message > only to it or also other nodes ? It can be either way depending on the link and path qualities. > Can there be a problem with root node sending of messages on UART or > some other queue overflow ? I am using baud rate of 115200. > Next, I will try to use printf to understand at which level the problem is. Queues should not overflow if you are not sending a lot of packets and if there are viable paths. It is possible to overflow a queue if a node is not able to drain it fast enough (too many retransmissions, for example) > As i read, the reliability of CTP should be 99.9% at low traffic rate, > but the 0.1% messages that are lost, are lost > periodically or there is a possibility that they can be lost in chunks > of messages ? and what will be high traffic rate ? If you are planning to saturate the channel, you should expect a lot of losses. If these motes are connected with a PC during the experiment, I suggest running tests/TestNetwork and looking at the debug messages logged by each mote to understand the cause for the loss you are seeing. - om_p _______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
