Hi Jeevaka, On 08/31/2010 10:48 AM, [email protected] wrote: > > Hi Denis, > >> The original USSD API actually did look like this. It used binary > data >> + dcs field. However, we quickly found that all modems are screwed up >> in this area. The specification added binary PDU mode to SMS and CBS, > but never bothered with USSD. So all modems get this part wrong. > >> Currently about the best we can do is pass UTF8 around. If you have a > modem that gets this part right, we'd like to hear about it. If the > Send USSD proactive command is >> not handled by the modem, then oFono will try to do its best. > However, we make no guarantees ;) > > I think its better to send the dcs and the binary data to the atom > driver. If the modem doesn't support other than GSM 7-bit alphabet, then > the conversion can be done in the atom driver. This way it will be > general to any modem.
The send part is not really the problem, and can be easily done as pdu + dcs. However, it is the reception that is screwed up. By convention, all APIs in oFono must be symmetric. E.g. what the driver sends it must also accept. According to 27.007, +CUSD is converted into the current character set used by CSCS. It is not a binary PDU at all. So the driver now has to fake this information... Go ahead and send your suggested approach as a patch to this mailing list and we can continue from there. Just remember the symmetry part ;) Regards, -Denis _______________________________________________ ofono mailing list [email protected] http://lists.ofono.org/listinfo/ofono
