我的网络中有一个ActiveMQ代理，监听1883（mqtt）。如果我使用简单的Java应用程序和mqtt-
client-0.4.0.jar库连接到该代理，则一切正常。

现在，我想使用Android设备连接到该代理。不幸的是，我无法管理它以成功建立连接。我总是收到以下错误：

03-23 11:08:15.679 24572-24572/com.my.package E/WorkerMQTT: onFailure: Unable to connect to server (32103) - java.net.ConnectException: failed to connect to /192.192.192.10 (port 1883) after 30000ms: isConnected failed: ENETUNREACH (Network is unreachable)
03-23 11:08:15.687 24572-24572/com.my.package W/System.err: Unable to connect to server (32103) - java.net.ConnectException: failed to connect to /192.192.192.10 (port 1883) after 30000ms: isConnected failed: ENETUNREACH (Network is unreachable)
03-23 11:08:15.695 24572-24572/com.my.package W/System.err:     at org.eclipse.paho.client.mqttv3.internal.TCPNetworkModule.start(TCPNetworkModule.java:79)
03-23 11:08:15.695 24572-24572/com.my.package W/System.err:     at org.eclipse.paho.client.mqttv3.internal.ClientComms$ConnectBG.run(ClientComms.java:590)
03-23 11:08:15.695 24572-24572/com.my.package W/System.err:     at java.lang.Thread.run(Thread.java:856)
03-23 11:08:15.695 24572-24572/com.my.package W/System.err: Caused by: java.net.ConnectException: failed to connect to /192.192.192.10 (port 1883) after 30000ms: isConnected failed: ENETUNREACH (Network is unreachable)
03-23 11:08:15.703 24572-24572/com.my.package W/System.err:     at libcore.io.IoBridge.isConnected(IoBridge.java:224)
03-23 11:08:15.703 24572-24572/com.my.package W/System.err:     at libcore.io.IoBridge.connectErrno(IoBridge.java:161)
03-23 11:08:15.703 24572-24572/com.my.package W/System.err:     at libcore.io.IoBridge.connect(IoBridge.java:112)
03-23 11:08:15.703 24572-24572/com.my.package W/System.err:     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
03-23 11:08:15.703 24572-24572/com.my.package W/System.err:     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
03-23 11:08:15.703 24572-24572/com.my.package W/System.err:     at java.net.Socket.connect(Socket.java:842)
03-23 11:08:15.703 24572-24572/com.my.package W/System.err:     at org.eclipse.paho.client.mqttv3.internal.TCPNetworkModule.start(TCPNetworkModule.java:70)
03-23 11:08:15.703 24572-24572/com.my.package W/System.err:     ... 2 more
03-23 11:08:15.703 24572-24572/com.my.package W/System.err: Caused by: libcore.io.ErrnoException: isConnected failed: ENETUNREACH (Network is unreachable)
03-23 11:08:15.703 24572-24572/com.my.package W/System.err:     at libcore.io.IoBridge.isConnected(IoBridge.java:208)
03-23 11:08:15.703 24572-24572/com.my.package W/System.err:     ... 8 more

我使用的是Android服务，该服务调用MqttWorker extends Thread{。

另外作为图书馆，我正在使用：

compile('org.eclipse.paho:org.eclipse.paho.android.service:1.0.2') {
      exclude module: 'support-v4'
}

按照我的工人的代码：

@Override
public void run() {
String clientId = "AndroidSub_7";

    try {
        this.client =
            new MqttAndroidClient(this.context, "tcp://192.192.192.10:1883", clientId);

        this.options = new MqttConnectOptions();
        this.options.setWill("clients/clienterrors", "crashed".getBytes(),2,true); // handle uncleanly closed subscribers

        this.client.setCallback(new ClientCallbacks()); // set new callbacks
        this.client.connect(options);

        IMqttToken conToken;

        conToken = client.connect(options, this.context, new IMqttActionListener() {
        @Override
        public void onSuccess(IMqttToken asyncActionToken) {
            Log.d(TAG, "onSuccess");
        }

        @Override
        public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
            Log.e(TAG, "onFailure: " + exception);
            exception.printStackTrace();
        }

        });
    } catch (MqttException e) {
        Log.e(TAG,"Connection to broker failed:" + e);
    }
}

到目前为止我尝试过的是：

1. 确保不要使用回送地址（此处有很多线程与此相关）
2. 确保我已在中设置了所需的权限 AndroidManifest.xml WAKE_LOCK /INTERNET / WRITE_EXTERNAL_STORAGE / ACCESS_NETWORK_STATE
3. 我创建了一个简单的线程类，以检查是否可以使用套接字连接到端口。成功了。
4. 我是否使用MqttAndroidClientor 都没有关系MqttClient。错误是一样的。

我希望有一个人可以帮助我。我没办法解决这个问题了。