[This message was posted by Rolf Andersson of Pantor Engineering <[email protected]> to the "FAST Protocol" discussion forum at http://fixprotocol.org/discuss/46. You can reply to it on-line at http://fixprotocol.org/discuss/read/e91d1c6b - PLEASE DO NOT REPLY BY MAIL.]
... and of course the pcap file header (24 bytes IIRC) at the beginning of the file and a pcap packet header (16 bytes) for each packet ... > Sean, the weird preamble indicates that you are looking at a pcap > formatted file (possibly produced by tcpdump -s0 -o ...) > > If this is indeed the case, then you have ETH, IP and UDP headers in > front of the payload. > > I'll try and download one of the files and have a closer look. > > HTH, Rolf > > > Rolf, I've download both 'DevPakOptions302.zip' and > > 'complex_decode.zip' from > > http://www.nyxdata.com/nysedata/default.aspx?tabid=712. > > > > The sample data I have comes from > > ftp://[email protected]/custom/ArcaBookMulticast. > > > > I've tried all of the files there, in particular OTC_A- > > C_compacted_20090309.cap.gz and another file beginning with 'tcpdump'. > > Which honestly makes me question what the data is, as the multicast > > stuff should be UDP (I thought, anyway). > > > > Even looking at the hex bytes in a hex editor doesn't help me - there > > is a weird preample on the files '0xD4 0xC3 0xB2 0xA1' and I don't > > understand what the data is/how it is laid out in the files. > > > > I've done this before with CME messages and those are usually pretty > > easy to go through by hand - these don't seem to match up to anything > > I can find in the spec. I also am hesitant with this sample data as I > > don't know exactly when it was captured/posted so I wonder if it could > > by out of sync with what the spec says. > > > > > Hi Sean, > > > > > > which of the decoders (exact name of .zip) have you downloaded and > > > which sample data file where you getting problems with? > > > > > > /Rolf > > > > > > > Has anyone had any experience decoding the FAST multicast market > > > > data from ArcaBook? > > > > > > > > I'm attempting to use the decoder they provide in the DevPak (and > > > > they insist works on their discussion forums) with sample data I > > > > downloaded from them, as well as some sample messages I found > > > > posted on their forums but am not having much luck. > > > > > > > > If anyone has done this, and has any other sample data or > > > > knowledge/experience to pass along I would be very grateful. > > > > > > > > Thanks, Sean [You can unsubscribe from this discussion group by sending a message to mailto:[email protected]] --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Financial Information eXchange" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/FIX-Protocol?hl=en -~----------~----~----~----~------~----~------~--~---
