The "HwAddress" property

HwAddress  readable   s

The "Carrier" property

Carrier  readable   b

Indicates whether the physical carrier is found (e.g. whether a cable is plugged in or not).

DEPRECATED: check for the "lower-up" flag in the "InterfaceFlags" property on the "org.freedesktop.NetworkManager.Device" interface.

The "Slaves" property

Slaves  readable   ao

DEPRECATED. Use the "Ports" property in "org.freedesktop.NetworkManager.Device" instead which exists since version NetworkManager 1.34.0.