opc ua milo -如何监控节点下的一个属性，并返回该节点的所有属性？

import org.eclipse.milo.opcua.sdk.client.OpcUaClient;
import org.eclipse.milo.opcua.sdk.client.api.UaClient;
import org.eclipse.milo.opcua.sdk.client.api.subscriptions.UaMonitoredItem;
import org.eclipse.milo.opcua.sdk.client.api.subscriptions.UaSubscription;
import org.eclipse.milo.opcua.sdk.client.nodes.UaVariableNode;
import org.eclipse.milo.opcua.stack.core.AttributeId;
import org.eclipse.milo.opcua.stack.core.Identifiers;
import org.eclipse.milo.opcua.stack.core.types.builtin.DataValue;
import org.eclipse.milo.opcua.stack.core.types.builtin.NodeId;
import org.eclipse.milo.opcua.stack.core.types.builtin.Variant;
import org.eclipse.milo.opcua.stack.core.types.structured.ReadValueId;
import org.eclipse.milo.opcua.stack.core.types.structured.ReadValueIdCollection;
import org.eclipse.milo.opcua.stack.core.types.structured.WriteValue;
import org.eclipse.milo.opcua.stack.core.types.structured.WriteValueCollection;

import java.util.concurrent.CompletableFuture;

public class NodeMonitoringExample {

    public static void main(String[] args) throws Exception {
        // 创建OPC UA客户端
        OpcUaClient client = OpcUaClient.create("opc.tcp://localhost:4840");

        // 连接到服务器
        client.connect().get();

        // 创建订阅
        UaSubscription subscription = client.getSubscriptionManager().createSubscription(1000.0).get();

        // 创建要监控的节点
        NodeId nodeId = new NodeId(2, "MyVariable");
        UaVariableNode variableNode = client.getAddressSpace().getVariableNode(nodeId).get();

        // 添加要读取的属性
        ReadValueId readValueId = new ReadValueId(
                nodeId,
                AttributeId.Value.uid(),
                null,
                QualifiedName.NULL_VALUE
        );
        ReadValueIdCollection nodesToRead = new ReadValueIdCollection(readValueId);

        // 监控节点属性变化
        UaMonitoredItem item = subscription.createMonitoredItem(
                new ReadValueIdCollection(readValueId),
                (item, value) -> {
                    // 处理属性变化
                    System.out.println("Value changed: " + value.getValue().getValue());
                }
        ).get();

        // 开始订阅
        subscription.addItems(item);

        // 读取节点的所有属性
        CompletableFuture<DataValue[]> future = client.readValues(0, TimestampsToReturn.Both, nodesToRead);
        DataValue[] values = future.get();

        // 打印节点的所有属性
        for (DataValue value : values) {
            System.out.println("Attribute value: " + value.getValue().getValue());
        }

        // 断开连接
        client.disconnect().get();
    }
}