ModemManager: Huawei PDU encoded USSD response truncated to 112 characters

[Graham Inggs <graham inggs uct ac za>]

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>'