android serversocket 4g网络不可达

android serversocket 4g network is unreachable

我有一个应用程序要求从 python 网络服务器接收 android 应用程序中的数据。我已经设置了一个本地环境来首先进行测试,并在本地托管了一个 python 服务器。使用套接字创建连接,服务器套接字在 android 应用程序上,客户端是 python 服务器。我基本上需要从服务器接收到应用程序的状态更新,而不需要它(通过 POST 排球,或类似改造)。

对于 android 方面,我基本上遵循了此页面上的 post... https://thinkandroid.wordpress.com/2010/03/27/incorporating-socket-programming-into-your-applications/

这是 python 服务器中的客户端套接字...

@app.route('/clientMessage', methods=['GET', 'POST'])
def clientMessage():
    address = request.values.get('address')
    host = address
    port = 6667

    #create an INET, STREAMing socket
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((host, port))

    #send message using socket
    s.sendall("please work\n")

    return "msg sent"

这是 android MainActivity,其中线程具有侦听服务器套接字

public class ServerThread implements Runnable {

    public void run() {
        try {
            if (SERVERIP != null) {
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        serverStatus.setText("Listening on IP: " + SERVERIP);

                    }
                });
                serverSocket = new ServerSocket(SERVERPORT);
                while (true) {
                    // LISTEN FOR INCOMING CLIENTS
                    Socket client = serverSocket.accept();
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            serverStatus.setText("Connected.");
                        }
                    });

                    try {
                        BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
                        String line = null;
                        while ((line = in.readLine()) != null) {
                            Log.d("ServerActivity", line);
                            final String finalLine = line;
                            handler.post(new Runnable() {
                                @Override
                                public void run() {
                                    mainTextView.setText(finalLine);
                                }
                            });
                        }
                        break;
                    } catch (Exception e) {
                        handler.post(new Runnable() {
                            @Override
                            public void run() {
                                serverStatus.setText("Oops. Connection interrupted.");
                            }
                        });
                        e.printStackTrace();
                    }
                }
            } else {
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        serverStatus.setText("Couldn't detect internet connection.");
                    }
                });
            }
        } catch (Exception e) {
            handler.post(new Runnable() {
                @Override
                public void run() {
                    serverStatus.setText("Error");
                }
            });
            e.printStackTrace();
        }
    }
}

当 android phone 与 python 服务器位于同一 internal/local 网络时,一切正常。一旦我关闭无线并连接到 4g,python 就会吐出​​这个错误。我正在使用 mac 如果这有所不同。

~/Documents/androidProjects/pythonExamples$ python serverSockets.py
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
[2016-11-04 09:45:05,876] ERROR in app: Exception on /clientMessage [GET]
Traceback (most recent call last):
File "/Library/Python/2.7/site-packages/flask/app.py", line 1988, in wsgi_app
response = self.full_dispatch_request()
  File "/Library/Python/2.7/site-packages/flask/app.py", line 1641, in full_dispatch_request
rv = self.handle_user_exception(e)
  File "/Library/Python/2.7/site-packages/flask/app.py", line 1544, in handle_user_exception
reraise(exc_type, exc_value, tb)
  File "/Library/Python/2.7/site-packages/flask/app.py", line 1639, in full_dispatch_request
rv = self.dispatch_request()
  File "/Library/Python/2.7/site-packages/flask/app.py", line 1625, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
  File "serverSockets.py", line 66, in clientMessage
s.connect((host, port))
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/socket.py", line 228, in meth
return getattr(self._sock,name)(*args)
error: [Errno 51] Network is unreachable
127.0.0.1 - - [04/Nov/2016 09:45:05] "GET /clientMessage?address=100.74.228.97 HTTP/1.1" 500 -

我已经在我的路由器中转发了那个端口,并且可以通过它 ping 网站所以我知道流量正在从我的网络传到网络,但我不明白为什么它无法到达 android 设备。我也尝试了很多不同的端口,可能有一个我需要使用的特定端口。这是我第一次玩套接字,我还是一个菜鸟 android 开发者。我敢肯定,当我将其移至托管在 heroku 的 public python 服务器时,我将不得不更多地考虑安全性和 ssl 问题,但是谁能告诉我为什么无法访问android 设备在 public 网络上时?

如果您的 android 设备使用移动连接,则无法通过互联网访问其上的服务器 运行,因为您的移动提供商将阻止传入连接。