The whole codebase is updated to assume the MMBaseModem AT operations
require an object implementing the MMIfacePortAt interface, instead of
a MMPortSerialAt object.
In the places where we know the port is a MMPortSerialAt, e.g. when we
query explicitly for the primary or secondary serial AT port, we will
use an explicit MM_IFACE_PORT_AT() cast when calling the AT command
method.
In the places where we get_best_at_port() we're going to assume that
we don't know the port type. This method will be updated in a follow
up commit to support the MMIfacePortAt interface as well.
Rework the AT string quote operation to build the output with the
GString helper, instead of manually calculating how many bytes we'll
need in the output. It just makes it clearer.
We are going to allow including the plugin sources built within the
ModemManager daemon binary; moving the sources within the daemon
sources directory makes it easier.
Aleksander Morgado
Lukas Voegl