Re: ModemManager: Huawei PDU encoded USSD response truncated to 112 characters

[Graham Inggs <graham inggs uct ac za>]

I've found that prior to the following commit:

http://cgit.freedesktop.org/ModemManager/ModemManager/commit/src/mm-charsets.c?id=d05c87e4c80f1a56a613241d14de4faeb0a8304a

...gsm_unpack() in src/mm-charsets.c took the number of encoded 
characters as input, now it takes the number of decoded characters as input.


On 07/11/2011 21:50, Graham Inggs wrote:
> I believe the cause of this problem is that the output string of
> gsm_unpack() needs to be larger than the input string.  We get 8
> characters out for every 7 input characters.
>
> I have attached a simple patch to /plugins/mm-modem-huawei-gsm.c which
> results in the full USSD response being returned.
>
> I am not sure that this patch is the correct fix.  It may be that
> gsm_unpack() in src/mm-charsets.c needs take the 8/7 growth into
> account when sizing the output array and returning the unpacked size.
> Would someone more familiar with src/mm-charsets.c offer some guidance
> please?
>
>
> On Fri, Nov 4, 2011 at 8:44 AM, Graham Inggs<graham inggs uct ac za>  wrote:
> > Tested with Huawei E1820.
> >
> > ussdresult = gsmussd.Initiate("*101#")
> > print "ussd response: %s" % ussdresult
> >
> > ussd response: Balance = R 9.50  Expiry date:02/05/2031.On-Net Minutes
> > = 01:16:00.Free SMS's = 51.Free Data = 100.00 MB.Free Da
> >
> > The full response should have been:
> >
> > Balance = R 9.50  Expiry date:02/05/2031.On-Net Minutes =
> > 01:16:00.Free SMS's = 51.Free Data = 100.00 MB.Free Data = 2007.44 MB.
> >
> > Partial ModemManager log:
> >
> > modem-manager[3316]:<debug>  [1320384816.466178]
> > [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): -->
> > 'AT+CUSD=1,"AA182C3602",15<CR>'
> > modem-manager[3316]:<debug>  [1320384816.504610]
> > [mm-at-serial-port.c:298] debug_log(): (ttyUSB0):<--
> > '<CR><LF>OK<CR><LF>'
> > modem-manager[3316]:<debug>  [1320384816.818950]
> > [mm-at-serial-port.c:298] debug_log(): (ttyUSB2):<--
> > '<CR><LF>^RSSI:16<CR><LF>'
> > modem-manager[3316]:<debug>  [1320384816.819316]
> > [mm-at-serial-port.c:298] debug_log(): (ttyUSB2):<--
> > '<CR><LF>^CSNR:-77,-7<CR><LF>'
> > modem-manager[3316]:<debug>  [1320384818.431324]
> > [mm-at-serial-port.c:298] debug_log(): (ttyUSB2):<-- '<CR><LF>+CUSD:
> > 0,"C2303BEC1E97413D90149473D5602050110F4FCBF32072985ED6C1642F58ED2583CD62AEA7BBE52CD341CDB4BB4E2FCF413D102CA68BD9743098CB282F9741D3E6F43407F540B598CB282F9741C4303D0CEA816230980B060335852EA3BC5C0611C3F430A80792C16037178D066A0A5D",15<CR><LF>'