The new property is a dictionary which may include different parameters,
depending on what is actually supported by the underlying modem. For now,
just bytes RX/TX.
Note that this object will expose the stats *as reported by the modem*. These
values may differ from e.g. what is seen in the network interface stats.
Even if the IPv6 bearer method is DHCP, the client should use SLAAC
(eg, IPv6 Router Solicitations, Router Adverisements, and possibly
DHCPv6) to determine the correct prefix and DNS information. In
some cases, even with the DHCP method, and IPv6 "address" will be
given which should be assigned to the data port before beginning
an IP addressing as the mobile network may expect this address
to be used.
This patch adds a 'mtu' value to the Ip4Config and Ip6Config property of
a Bearer object, which indicates the value of the maximum transmission
unit for the established connection when such information is available
(e.g. via QMI_WDS_GET_RUNTIME_SETTINGS on a QMI modem or
MBIM_CID_IP_CONFIGURATION on a MBIM modem).