RRLP / ephemeris data

Dear Daniel and Jan, you have been working very closely with and on the u-blox GPS receiver during your work on the Openmoko GTA02. As far as I know, it is possible to obtain the ephemeris data from a u-blox receiver. I would like to see some code that obtains and converts that ephemeris data into the format described by the RRLP protocol specification. I know this involves asn.1 PER ugliness, but this can all be done well outside the OpenBSC codebase. What I'll propose is to simply use some pattern matching to determine the RRLP request for assistance data, and if such a request exists, open some file in the filesystem and send the contents binary as-is to the phone in response. Any responses from the phone are already stored in the database anyway. In case any of you are interested in working on something to generate the required ephemeris data and have time before or even at the 26C3, you can simply give me the resulting binary file, I can drop it into the OpenBSC directory and we'll see what happens. If this doesn't happen right now, it doesn't matter all that much, as the 26C3 is an indoor event and I don't think we'll be getting that many GPS fixes in such an environment anyway. But eventually, for the next outdoor test, and to do some more RRLP security research, the ephemeris data formatter would be really great! Cheers, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)