UDP广播：摩托罗拉阻止传入端口？ [英] UDP Broadcast: Motorola block incoming ports?

问题描述

我已经创建了一个库，用于使用WiFi网络发送和接收 UDP广播，并且我的代码运行正常，我尝试了一下使用 Nexus 5 和三星Galaxy S2 ，并且通信效果很好，它们都可以发送和接收。

I've created a library for sending and receiving UDP broadcasts using a WiFi network, and my code works fine, I tried it using a Nexus 5 and a Samsung Galaxy S2 and the communication works great, they both send and receive.

当我使用 Moto G 尝试相同的代码时，设备可以将包裹发送到其他手机，但什么也收不到。我可以责怪Moto G，因为该代码在其他两个设备中都可以正常工作，而且它们都可以接收Moto G发送的程序包。我什至尝试了两种不同的Moto G，一种股票，另一种植根于特定的防火墙策略。

When I try my same code with a Moto G, the device can send packages to other phones, but can't receive anything. I can blame the Moto G because the code works great in other two devices and they both can receive the packages that the Moto G sends. I even tried two different Moto G, one stock and one rooted with specific firewall policies.

我尝试使用不同的端口，说实话很多，但是我想问题并不是

I tried using different ports, not many honestly, but I guess the problem is not there.

任何提示可能出什么问题了吗？

Any clues what could be wrong?

每台设备的Android版本：
Nexus 5：4.5
S2：4.1.2
Moto G 1：4.4.2
Moto G 2：4.4.1（不确定）

Android versions for each device: Nexus 5: 4.5 S2: 4.1.2 Moto G 1: 4.4.2 Moto G 2: 4.4.1 (not sure)

我的目标是SDK16。我的代码在这里。

I'm targeting SDK 16. My code is here.

推荐答案

1. 将 MulticastSocket 用于


2. 将广播消息发送到多播地址（224.0.0.0至239.255.255.255 <，而不是 DatagramSocket 。
/ code>）


1. Use MulticastSocket for receiving instead of DatagramSocket.
2. Send broadcast message to multicast address (224.0.0.0 to 239.255.255.255)

发件人

Sender

final String ip = "224.0.0.3";
final int port = 8091;
DatagramSocket socket = new DatagramSocket();
DatagramPacket packet = new DatagramPacket(msg,msg.length, InetAddress.getByName(ip),port);
socket.send(packet);

接收器

Receiver

MulticastSocket socket = new MulticastSocket(8091);
socket.joinGroup(InetAddress.getByName("224.0.0.3"));
byte[] data = new byte[4096];
while(!stop){
    DatagramPacket packet = new DatagramPacket(data,data.length);
    socket.receive(packet);
}

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