Android UDP对等网络通信（无服务器）

我是Android网络的新手，在没有服务器的情况下处理项目p2p .

最初我必须在2台设备之间进行通信 . 我通过DataGramSocket实现了在不同NATS内部和后面的两个wifi网络之间的成功通信，并通过Upnp使用library进行端口转发 .

我面临的问题是移动网络和我的wifi网络之间或2移动网络之间的通信 . 当我从移动网络发送消息时，我无法在我的应用程序中收到它，但可以在NetCat应用程序中的同一端口上收听 .

谁能在这方面帮助我？

Sending

try {
        socket = new DatagramSocket(dstPort);
        address = InetAddress.getByName(dstAddress);
        socket.connect(address,dstPort);
        socket.setBroadcast(false);
        socket.setReuseAddress(true);
        //sendState("Socket Status "+socket.isConnected());
        String sendString = msg;
        byte[] sendData = sendString.getBytes("UTF-8");
        DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length,
                address, dstPort);
        socket.send(sendPacket);
        //sendState("Sent = "+sendData);

    } catch (SocketException e) {
        //sendState(e.getLocalizedMessage());
        sendState("SocketException");
    }

Receiving

try {
            socket = new DatagramSocket(dstPort);
            address = InetAddress.getByName(dstAddress);
            // send request
            byte[] buf = new byte[4096];
            DatagramPacket packet =
                    new DatagramPacket(buf, buf.length, address, dstPort);
            socket.connect(address,dstPort);
            socket.setBroadcast(false);
            socket.setReuseAddress(true);
            socket.receive(packet);
            String line = new String(packet.getData(), 0, packet.getLength());
            sendState(line);
            //sendState("Reached3");


        } catch (SocketException e) {
            //sendState(e.getLocalizedMessage());
            sendState("SocketException");
        }

Port Forwarding via UpNp

protected void setUpnp(int port_)
{
    if(Connectivity.isConnectedWifi(this)) {
        String myIp = getIpAddress();
        int port = port_;

        //creates a port mapping configuration with the external/internal port, an internal host IP, the protocol and an optional description
        PortMapping[] desiredMapping = new PortMapping[2];
        desiredMapping[0] = new PortMapping(port, myIp, PortMapping.Protocol.TCP);
        desiredMapping[1] = new PortMapping(port, myIp, PortMapping.Protocol.UDP);

        //starting the UPnP service
        UpnpService upnpService = new UpnpServiceImpl(new AndroidUpnpServiceConfiguration());
        RegistryListener registryListener = new PortMappingListener(desiredMapping);
        upnpService.getRegistry().addListener(registryListener);
        upnpService.getControlPoint().search();
    }
    else if(Connectivity.isConnectedMobile(this))
    {

    }
}