This switch can be run along with the `--messaging-create-sms' action, in order
to include in the SMS the data as given in the file specified by the new switch.
E.g.:
$> sudo mmcli -m 0 \
--messaging-create-sms="number='1234567890'" \
--messaging-create-sms-with-data=file.txt
In this case, the SMS properties string cannot contain a 'text' field.
Do not try to perform feature/capability specific actions if we're still
unlocked, as the modem didn't yet export the feature/capability specific
interface.
The only interfaces expected while modem is unlocked are the Modem and Simple
interfaces, as well as the SIM interface in the SIM object, of course.
