[MM] [PATCH 3/3] ZTE: improperly USSD-query encoding

When I send an USSD query, it should be encoded to proper charset (UCS2
in my case). But it is not. Because of this USSD queries do not work at
all on my ZTE MF192 modem:

(ttyACM0): --> 'AT+CUSD=1,"*100#",15<CR>'
(ttyACM0): <-- '<CR><LF>ERROR<CR><LF>'

In git logs I have found this commit:

It disables hex encoding for USSD requests for all ZTE modems.

With that patch reversed, USSD works fine for me:

(ttyACM0): --> 'AT+CUSD=1,"002A0031003000300023",15<CR>'
(ttyACM0): <-- '<CR><LF>+CUSD: 0,"04110430043B0430043D0441003A003600390037002C0039003604400020041E043F043B0430044204300020043A043004400442043E04390020043F043E00200431002F043F002004420435043B04350444043E043D04430020002B00370034003900350037003600360030003100360036",72<CR><LF><CR><LF>OK<CR><LF>'
decode_ussd_response(): USSD data coding scheme 72

So, I think, ModemManager should match modem model and decide, if it
needs hex encodings. What do you think about this?

Alexander Orlov

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