Hi, CtpP wires CtpRoutingEngineP.BeaconSend to LinkEstimatorP.Send, so the LinkEstimator can add a header and a footer to each packet sent by CtpRoutingEngineP. The bytes 01 08 are the link estimator header ( linkest_header_t in LinkEstimator.h). The first byte encodes the number of elements in the footer and some flags, the second byte is a sequence counter. In this case the footer contains only one element. Each element is a neighbor_stat_entry_t struct. In your example the footer is 00 02 2F. The first two bytes are a node address, the last byte is the input link quality.
The real CTP routing frame is: 00 00 00 00 00 00 : CTP routing flags (congested, pull), in this case there are none 00 00: parent, in this case the node itself 00 00: ETX Regards. -- Giuseppe Cardone On Tue, May 4, 2010 at 11:37 PM, Yusnaidi Md Yusof <[email protected]> wrote: > Hi All, > > I have the following data reading from the TestNetwork application. The data > is read using the java 'net.tinyos.tools.Listen' tool. > > 00 FF FF 00 00 0A 22 70 01 08 00 00 00 00 00 00 02 2F. > > What I understood when interpreting the data is: > > 1. The first byte (00) refers to the AM type which said can be ignored. > 2. The next 'FF FF' is the destination address. > 3. The next '00 00' is the source address. > 4. The next '0A' is the length of the data. > 5. The next '22' is the group ID. > 6. The next '70' is the AM handler type. -> which I believe this byte > indicates the data stream belongs to the CTP routing frame since I found > from the Ctp.h, '0x70' is an enum for AM_CTP_ROUTING. > > Thus, the rest of the bytes, I translated as the fields that belongs to the > CTP routing frame; thus by referring to TEP 123, the next byte after '70' > which is '01' would refer as 'reserved' field, the next '08 00' will be the > 'parent' field, the next '00 00' will be the 'ETX' field, and the rest I > really have no idea what they are?? Instead, I think my interpretation here > sounds wrong since it doesn't make sense that '08 00' refers to 'parent' > field because I set (by issuing make micaz install) the motes ID to be 0, 1, > 2, etc..and none of them are '08 00' hexa. If I translate them as data of > CTP routing frame, that could also be wrong since CTP routing frame does not > carry data... > > I am so confused here and really need your help guys... > > Thanks > > Yusnaidi > > > > _______________________________________________ > 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
