The various attributes obtained from CGREG are actually completely
useless and are not used internally for anything except computing the
Attached status. It makes sense to get rid of these properties since
they will be the same as reported by CREG in Dual-Transfer-Mode devices.
The only difference might be how hardware reports the technology used,
but frequently a vendor specific command is required anyway
This commit implements the GPRS context setup and teardown according to
doc/dataconnectionmanager-api.txt
One issue with the AT implementation of the api is that "Powered" (a
read-write property) can be set independently of "Attached" (read-only
property) and remain set when "Attached" is clear. The semantics would
be that the network doesn't have resources to let the modem attach,
but the modem waits for the resources to become available and then
attaches. On AT the modem is in this state only when executing +CGATT,
so currently the code will rerun +CGATT as soon as the previous one
returns with error, probably starving other commands. A possible
workaround would be for "Powered" to flip back to False after the modem
fails to attach once, or give up on having separate properties.
Alternatively we could re-try to attach periodically but on one modem
I've tried +CGATT fails after about 1 minute (that's the Calypso) and
on another only about 0.5s (Nokia phones with AT emulation).
When "Powered" is set and "RoamingAllowed" is clear and we manage to
attach and find that we're roaming, ofono resets "Powered".
We may want to catch the user trying to dial *99***1# which is the
backwards compatibility quirk for old modems (same way ofono parses
USSD strings).
Denis Kenzior
Anders Gustafsson
Martin Xu
Andrzej Zaborowski
Denis Kenzior