Unify USSD and MMI promise behaviour #70
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Background:
MMI code = any code you enter on your phone with * or #
USSD code = MMI code that doesn't only access the phone's hardware and requires a response from the operator
Here is how you currently send a MMI code from gaia:
It should be possible to do the same thing for a USSD code.
However, currently, the promise is resolved instantly with an empty result if the message is sent correctly, and the real response comes later, in a system message:
Please note that USSD responses can also contain an object called USSDSession, that you can use to cancel or reply to a dialogue with the operator, which usually looks like a menu.
This PR tries to do the following: