Querying network state via D-Bus; unexpected result values

[Adam Tauno Williams <awilliam whitemice org>]

I'm attempting to interrogate the state of the network condition via  
Network Manager's D-Bus service.  I can reliably get a value, but the  
value seems incorrect.

According to  
<http://projects.gnome.org/NetworkManager/developers/spec-07.html#type-NM_DEVICE_STATE> I expect to see a value of 8 [NM_DEVICE_STATE_ACTIVATED] if the device is online.   But what I see from call is generally a 20 if the interface [Device 0, eth0] is unplugged and a value of 100 if the interface is  
online.

#!/bin/env python
import dbus

bus = dbus.SystemBus()
proxy = bus.get_object("org.freedesktop.NetworkManager",  
"/org/freedesktop/NetworkManager")
manager = dbus.Interface(proxy, "org.freedesktop.NetworkManager")
# Get device-specific state
devices = manager.GetDevices()
for d in devices:
    dev_proxy = bus.get_object("org.freedesktop.NetworkManager", d)
    prop_iface = dbus.Interface(dev_proxy, "org.freedesktop.DBus.Properties")
    # Get the device's current state and interface name
    state = prop_iface.Get("org.freedesktop.NetworkManager.Device", "State")
    name = prop_iface.Get("org.freedesktop.NetworkManager.Device",  
"Interface")
    # and print them out
    print state
    if state == 8:   # activated
        print "Device %s is activated" % name
    else:
        print "Device %s is not activated" % name