Returns the status of a connection or of an OPC UA Server. This is a read-only property. Possible values for this property are -1 - ussNotConnected: OPC UA Server is not connected (default), 0 - ussRunning: OPC UA Server is executing normally, 1 - ussFailed: OPC UA Server is not executing, 2 - ussNoConfig: OPC UA Server is executing, but without information about its configuration, 3 - ussSuspended: OPC UA Server was temporarily suspended, 4 - ussShutdown: OPC UA Server was shut down, 5 - ussTest: OPC UA Server is in test mode, 6 - ussCommunicationFault: There was a communication failure with the OPC UA Server, or 7 - ussUnknown: OPC UA Server status is unknown.