The QMI radio-settings atom was just a skeleton and did not even implement
the mandtory property TechnologyPreference. As such, it probably should
never even have been registered for the modem. Nonetheless, this patch
puts this mandatory property into place.
This is implemented via the 'Set System Selection' method by way of the
'mode' parameter. This seems to best reflect the intention of the Ofono
API and works as expected when tested with a Quectel EC21.
Some notes:
i) There is an alternative function called 'Set Technology Preference'
which provides similar functionality. This 'technology preference'
is updated automatically when the 'system selection mode' is modified
so everything seems to be in order.
ii) For the EC21, switching the underlying technology works seamlessly.
There are indications, however, that some modems _might_ require a
reset before changes take effect; that bridge will need to be crossed
if reached.
When registering to an operator ofono uses the old RAT.
In the case the modem is not connected to any network, this would use
QMI_NAS_NETWORK_RAT_NONE which results in the error OP_DEVICE_UNSUPPORTED.
Use QMI_NAS_NETWORK_RAT_NO_CHANGE instead to not define any preference.
Calling the ps_state/cs_state alternatives *ATTACH_STATUS* was confusing
because there is also a status field in the *serving_system structure.
This patch does a minor rename and adds the appropriate definitions for
the status field.
Get current signal strength (type: 0x01), not list of other signals strength
(0x10)
Without this fix:
- I can't get a signal strength on MC7430 because list does not exist
(only one signal strength).
- On MC7304, result is wrong
Alexander Couzens
Jonas Bonn
Christophe Ronco
Marcel Holtmann