[RFC] Deprecate SubscriptionState?

[Aleksander Morgado]

Hey Dan, Ben & all,

The SubscriptionState property was originally thought to expose the
state of the subscription with the operator. It has been implemented
only in the Altair LTE plugin, and the current implementation is based
on two main things:
 * Verizon-specific logic that allows knowing the subscription state
based on the PCO info.
 * Registration check errors, e.g. to say that the SIM is
unprovisioned when the registration fails.

I'm not sure any of the previous two things are very robust. The
Verizon-specific parsing will only work for Verizon, and the
registration check errors may be caused by multiple different root
causes. To me it looks like the Altair LTE plugin is trying to do more
than it's supposed to do. It would be much better if we exposed the
raw PCO info received, and let upper layers process that if needed
with operator-specific logic.

What do you all think?
Should we deprecate the SubscriptionState property?
Should we expose the raw PCO info?

-- 
Aleksander
https://aleksander.es