Gets all the known network devices.
Use nm_device_get_type or the <literal>NM_IS_DEVICE_XXXX</literal> functions to determine what kind of device
member of the returned array is, and then you may use device-specific methods such as nm_device_ethernet_get_hw_address.
| this |
a Client |
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a GenericArray containing all the Devices. The returned array is owned by the Client object and should not be modified. |