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Bhaskar11 niceguy108 at gmail.comThanks for the clarification. I'm developing in an unencrypted private network so it did not strike me! >>If you want to save the cleartext decoded burst, use tcpdump or wireshark. I would like to extract only the SMS messages sent to me and save the text only automatically from within my modified ccch_scan, without using external monitoring tools like wireshark. 1. From what I have figured out so far, I need to catch the L2 packets at the point where they are sent on gsmtap_send(), and then apply my own decode to filter out SMS messages and extract data. Is this correct so far? 2. What reference material would you recommend for L2 packet formats? I checked the 3gpp website, but there are so many versions of all specs that I cannot figure what to use, and could not figure out where the format definitions are given. Is there a better site generally for GSM specs? Or should I be able to figure this out from the mobile app code alone? (I tried that but kind of got lost in the call setup process. I will try again anyway!) Thanks for your prompt guidance. B. On Sun, Dec 30, 2012 at 6:06 PM, Sylvain Munaut <246tnt at gmail.com> wrote: > Hi, > > > > Would it not be more useful to save burst data after local_burst_decode? > > After local_burst_decode they are not bursts anymore, they are L2 > packets and that call only works if either it's unciphered or if you > know the key. > > If you want to save the cleartext decoded burst, use tcpdump or wireshark. > > > > Is there some utility in storing it in its raw form? Looks like I am > missing > > something? > > They're stored by by ccch_scan ... but there are no utility to use > those data, you have to write an utility to use those data in any way > you'd like. > > > Cheers, > > Sylvain > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/baseband-devel/attachments/20121230/3fda9a4f/attachment.htm>