[review] USSD support for MBIM

[Dan Williams]

On Wed, 2018-08-08 at 17:18 +0200, Aleksander Morgado wrote:
> Hey,
> 
> This MR adds USSD support for MBIM devices, and while at it, also
> ported the original MMBroadbandModem USSD support to GTask:
> 
> https://gitlab.freedesktop.org/mobile-broadband/ModemManager/merge_re
> quests/23
> 
> The MBIM USSD logic basically matches what we had for the AT+CUSD
> based logic. The main difference being that the actual strings are
> always encoded (GSM7 or UCS2) in the MBIM USSD logic while the
> strings
> passed to AT+CUSD were all in the current modem charset, except for
> Huawei modems (which are also always in GSM7/hex).
> 
> Comments?

Merged to git master.

Dan