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PropertiesChanged (a{sv} properties);
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 | A dictionary mapping property names to variant boxed values | 
VpnStateChanged (u state,
                 u reason);
Emitted when the state of the VPN connection has changed.
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 | (NMVpnConnectionState) The new state of the VPN connection. | 
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 | (NMVpnConnectionStateReason) Reason code describing the change to the new state. | 
VpnState readable u
The VPN-specific state of the connection.
Returns: NMVpnConnectionState