Indicates the automatic discovery result of the slave port. This node is read-only. Options: 1. notfound(1) -indicates that the slave port is not discovered. The state of the automatic discovery state machine is NULL or INIT and the master node does not receive an active-close message from the slave node, or the state of the automatic discovery state machine is detecting. 2. detected(2) -indicates that the slave port is discovered. The state of the automatic discovery state machine is established or pending. 3. activeclose(3) -indicates that the slave port is actively closed. The state of the automatic discovery state machine is INIT and the master node receives an active close message from the slave node.