无法通过广播地址接收UDP数据包,ArtNet

Question

我正在尝试接收raspberry PI上的UDP数据包。我已经创建了一个简单的java程序来连接网络。（我下面有所有相关代码）

String myNetworkAddress = "10.0.0.11";
String myBroadcastAddress = "10.255.255.255";
// Setup network connection
    try {
        InetAddress nicAddress = InetAddress.getByName(myNetworkAddress);
        InetAddress baddr = InetAddress.getByName(myBroadcastAddress);
        dmx = new ArtNet(nicAddress, baddr);

        udpsocket = new DatagramSocket(null);
        udpsocket.setReuseAddress(true);
        udpsocket.bind(new InetSocketAddress(nicAddress, dmx.getPort()));
        udpsocket.setBroadcast(true);
        udpsocket.setSoTimeout(1000);
        System.out.println("Opened socket " + udpsocket.getLocalAddress() + ":" + udpsocket.getLocalPort());
    } catch (Exception e) {
        System.out.println("can't open socket " + e);
    }

while (true) {
        if (udpsocket != null) {
            if (dmx.readPacket(udpsocket)) {
                i = dmx.getPacket();
// read packet and process 
 }
 }
 }

我不能从广播中接收到任何东西，在一个覆盆子圆周率。但当我在另一台计算机上运行此代码时，我能够从广播中接收数据包。这让我相信java没有被授予创建套接字、绑定端口的权限，并且它不是代码，而是raspberry PI上的一种安全措施。

null

eth0      Link encap:Ethernet  HWaddr b8:27:eb:11:11:11
          inet addr:192.168.1.48  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:351 errors:0 dropped:0 overruns:0 frame:0
          TX packets:376 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:25333 (24.7 KiB)  TX bytes:77137 (75.3 KiB)

timeout 10;
lease {
    interface "eth0";
    fixed-address 10.0.0.10;
    option broadcast-address 10.255.255.255;
    option subnet-mask 255.0.0.0;
    option host-name "node.local";
    renew 2 2022/1/1 00:00:01;
    rebind 2 2022/1/1 00:00:01;
    expire 2 2022/1/1 00:00:01;
}

没有运气。如有任何建议或帮助，我们将不胜感激。

Answer 1

通过绑定NicAddress，它只接受来自网络地址的传入数据包。绑定到0.0.0.0将允许来自广播IP和其他IP地址的传入协议