我是BACnet和其他自动化协议的新手。我们将编写一个BACnet客户端，预计将连接到BACnet接口以获取对象，并进一步我们将在微服务层中摄取这些对象。我们的服务器基础结构包含LumInsight桌面将数据推送到BACnet接口。我们正在引用一个示例代码，但在运行它时，我遇到了以下问题：
> inside main....com.serotonin.bacnet4j.transport.DefaultTransport@7b7221a0
inside main....3996: BACnet device
Exception in thread "main" java.net.BindException: Address already in use: Cannot bind
at java.net.DualStackPlainDatagramSocketImpl.socketBind(Native Method)
at java.net.DualStackPlainDatagramSocketImpl.bind0(Unknown Source)
at java.net.AbstractPlainDatagramSocketImpl.bind(Unknown Source)
at java.net.DatagramSocket.bind(Unknown Source)
at java.net.DatagramSocket.<init>(Unknown Source)
at com.serotonin.bacnet4j.npdu.ip.IpNetwork.initialize(IpNetwork.java:215)
at com.serotonin.bacnet4j.transport.DefaultTransport.initialize(DefaultTransport.java:183)
at com.serotonin.bacnet4j.LocalDevice.initialize(LocalDevice.java:228)
at com.bacnet.Main.main(Main.java:110)
package com.bacnet;
import com.serotonin.bacnet4j.LocalDevice;
import com.serotonin.bacnet4j.RemoteDevice;
import com.serotonin.bacnet4j.ServiceFuture;
import com.serotonin.bacnet4j.event.DeviceEventAdapter;
import com.serotonin.bacnet4j.exception.BACnetException;
import com.serotonin.bacnet4j.exception.ErrorAPDUException;
import com.serotonin.bacnet4j.npdu.ip.IpNetwork;
import com.serotonin.bacnet4j.service.acknowledgement.ReadPropertyAck;
import com.serotonin.bacnet4j.service.acknowledgement.ReadPropertyMultipleAck;
import com.serotonin.bacnet4j.service.confirmed.*;
import com.serotonin.bacnet4j.service.unconfirmed.WhoIsRequest;
import com.serotonin.bacnet4j.transport.DefaultTransport;
import com.serotonin.bacnet4j.transport.Transport;
import com.serotonin.bacnet4j.type.constructed.ReadAccessResult;
import com.serotonin.bacnet4j.type.constructed.ReadAccessSpecification;
import com.serotonin.bacnet4j.type.constructed.SequenceOf;
import com.serotonin.bacnet4j.type.enumerated.ObjectType;
import com.serotonin.bacnet4j.type.enumerated.PropertyIdentifier;
import com.serotonin.bacnet4j.type.enumerated.Segmentation;
import com.serotonin.bacnet4j.type.primitive.ObjectIdentifier;
import com.serotonin.bacnet4j.type.primitive.Real;
import com.serotonin.bacnet4j.util.DiscoveryUtils;
import com.serotonin.bacnet4j.RemoteObject;
import java.util.ArrayList;
import java.util.List;
public class Main {
public static void main(String[] args) throws Exception {
IpNetwork network = new IpNetwork("10.44.55.5", IpNetwork.DEFAULT_PORT);
Transport transport = new DefaultTransport(network);
System.out.println("inside main...." + transport);
transport.setTimeout(500);
transport.setSegTimeout(150);
final LocalDevice localDevice = new LocalDevice(3996, transport);
System.out.println("inside main...." + localDevice);
localDevice.getEventHandler().addListener(new DeviceEventAdapter() {
@Override
public void iAmReceived(RemoteDevice device) {
System.out.println("inside I am received...");
System.out.println("Discovered device " + device);
localDevice.addRemoteDevice(device);
final RemoteDevice remoteDevice = localDevice
.getRemoteDevice(device.getAddress());
remoteDevice
.setSegmentationSupported(Segmentation.segmentedBoth);
new Thread(new Runnable() {
@Override
public void run() {
try {
try {
DiscoveryUtils.getExtendedDeviceInformation(
localDevice, remoteDevice);
} catch (BACnetException e) {
e.printStackTrace();
}
System.out.println(remoteDevice.getName() + " "
+ remoteDevice.getVendorName() + " "
+ remoteDevice.getModelName() + " "
+ remoteDevice.getAddress() + " "
+ remoteDevice.getProtocolRevision() + " "
+ remoteDevice.getProtocolVersion());
ReadPropertyAck ack = localDevice.send(
remoteDevice,
new ReadPropertyRequest(remoteDevice
.getObjectIdentifier(),
PropertyIdentifier.objectList))
.get();
SequenceOf<ObjectIdentifier> value = ack.getValue();
for (ObjectIdentifier id : value) {
List<ReadAccessSpecification> specs = new ArrayList<ReadAccessSpecification>();
specs.add(new ReadAccessSpecification(id,
PropertyIdentifier.presentValue));
specs.add(new ReadAccessSpecification(id,
PropertyIdentifier.units));
specs.add(new ReadAccessSpecification(id,
PropertyIdentifier.objectName));
specs.add(new ReadAccessSpecification(id,
PropertyIdentifier.description));
specs.add(new ReadAccessSpecification(id,
PropertyIdentifier.objectType));
ReadPropertyMultipleRequest multipleRequest = new ReadPropertyMultipleRequest(
new SequenceOf<ReadAccessSpecification>(
specs));
ReadPropertyMultipleAck send = localDevice
.send(remoteDevice, multipleRequest)
.get();
SequenceOf<ReadAccessResult> readAccessResults = send
.getListOfReadAccessResults();
System.out.print(id.getInstanceNumber() + " "
+ id.getObjectType() + ", ");
for (ReadAccessResult result : readAccessResults) {
for (ReadAccessResult.Result r : result
.getListOfResults()) {
System.out.print(r.getReadResult()
+ ", ");
}
}
System.out.println();
}
ObjectIdentifier mode = new ObjectIdentifier(
ObjectType.analogValue, 11);
ServiceFuture send = localDevice.send(remoteDevice,
new WritePropertyRequest(mode,
PropertyIdentifier.presentValue,
null, new Real(2), null));
System.out.println(send.getClass());
System.out.println(send.get().getClass());
} catch (ErrorAPDUException e) {
System.out.println("Could not read value "
+ e.getApdu().getError() + " " + e);
} catch (BACnetException e) {
e.printStackTrace();
}
}
}).start();
}
@Override
public void iHaveReceived(RemoteDevice device, RemoteObject object) {
System.out.println("Value reported " + device + " " + object);
}
});
localDevice.initialize();
localDevice.sendGlobalBroadcast(new WhoIsRequest());
List<RemoteDevice> remoteDevices = localDevice.getRemoteDevices();
for (RemoteDevice device : remoteDevices) {
System.out.println("Remote dev " + device);
}
System.in.read();
localDevice.terminate();
}
}
错误是自解释“地址已在使用中”，请检查是否有任何其他客户端正在运行并使用端口47808（默认端口）。
请在终止日食中当前正在运行的所有任务后重新运行程序。或者使用netstat -a来检查哪个应用程序正在获取47808。
最简单的解决方案是将本地默认端口更改为47809或1024以上的其他端口。
如果您还有任何问题。请回复，我使用BACnet4j创建了几个客户端。
从理论上讲，如果你将套接字设置为'非独占'并且'重用' - 在你'绑定'它之前，你只能使用相同的（套接字）端口＃，但是那时可能没有必要尝试共享它只有1个侦听器/“客户端”可能从该UDP端口接收响应。
始终考虑在另一个端口上发送（“客户端”）请求;并且在标准端口＃ - 47808 / 0xBAC0上唯一地监听（到“服务器”响应），如果可以的话（假设它没有被主动使用/你不能放弃现有的端口使用＃代替这个/你的新用法/需要）。
对于Windows，您可以使用“命令提示符”中的“netstat -ao”cmd-line工具查看持有/使用端口号的应用程序的“PID”（进程ID），然后您可以显示Windows“任务管理器”中的PID列，用于查看PID映射到的应用程序。