Please help me shed some light in this! Thank you!!
---------- Forwarded message ---------- From: Pedro Almeida <[EMAIL PROTECTED]> Date: Jul 2, 2007 2:43 PM Subject: Decoding the contents of a Serial frame returned by TestNetwork App (again) To: tinyos-help@millennium.berkeley.edu (this is a repost from a last month's mail that I didnt want to see go forgotten) Hello all; Some weeks ago I asked about the exact contents of a frame I was receiving through the serial port, of which I couldn't decode whatsoever (first mail here: http://mail.millennium.berkeley.edu/pipermail/tinyos-help/2007-June/025739.html ). With the help of some people (Alexander Becher, Steve McKown, David Moss and Benjamin Madore), we managed to make some sense out of it. However, I am reaching that time period where it would be really handy to have the rest cleared. So summing it all up, I receive this in the serial port (example frame): 7E 45 00 FF FF 00 00 13 00 EE 00 01 00 00 00 07 80 EE 00 07 00 80 00 00 00 00 20 00 00 53 63 7E and the sent structure is like this: typedef nx_struct TestNetworkMsg { nx_am_addr_t source; nx_uint16_t seqno; nx_am_addr_t parent; nx_uint16_t metric; nx_uint8_t datah; nx_uint8_t datal; nx_uint8_t hopcount; nx_uint16_t sendCount; nx_uint16_t sendSuccessCount; } TestNetworkMsg; the platform is the MicaZ and the app is the TestNetwork. we've went this far on the decoding process (* marks confirmed field): *7E : Framing byte, denoting start of packet *45 : Protocol Byte (NO_ACK) *00 : Packet Format Dispatch Byte *FF FF : destination address (from UART) *00 00 : source address (root node) 13 : length 00 EE : Collection ID (from CTP) ?? / Type ?? / Destination PAN Identifier (from MAC Header) 00 : ???? 01 : hopcount (seems out of place, but sure looks like it!!!) ???? 00 00 : Destination Address (root ID=0) (from MAC Header) ??? 00 07 : Source Address (from the MAC Header) ???? 80 : sendCount ??? (this field increments like the seqno below) EE : Collection ID (from CTP) ?? / Type ?? *00 07 : source *00 80 : seqno *00 00 : parent *00 00 : metric *20 00 : data 00 : ??? *53 63:two byte CRC *7E : Framing byte, denoting end of packet Can you help me? Thank you for the (once again) inconvenience; Pedro
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