我正在为android构建一个简单的MQTT客户端,并且我在RMBS控制台上获得"客户端标识符的套接字错误"错误。这只发生在客户机的android实现中(我还创建了一个Java桌面客户机,运行起来没有问题)。对于Android客户机,我使用Paho Java客户机库。下面是我的代码:
Android客户端:
package com.example.mqttdroid;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.eclipse.paho.client.mqttv3.MqttTopic;
import org.eclipse.paho.client.mqttv3.internal.MemoryPersistence;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.widget.Toast;
public class MQTTClient extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mqttclient);
// new BackTask().execute(); not used because (seems to be the problem)
MqttConnectOptions conOpts = new MqttConnectOptions();
conOpts.setKeepAliveInterval(30);
conOpts.setWill(client.getTopic("Error"), "something bad happened".getBytes(), 1, true);
client.connect(conOpts);
client.subscribe("/House/Kitchen/Bulb");
client.setCallback( new MqttCallback() {
@Override
public void connectionLost(Throwable arg0) {
// TODO Auto-generated method stub
}
@Override
public void deliveryComplete(IMqttDeliveryToken arg0) {
// TODO Auto-generated method stub
}
@Override
public void messageArrived(String arg0, MqttMessage arg1)
throws Exception {
// TODO Auto-generated method stub
Toast.makeText(Main.this, arg0.toString(), Toast.LENGTH_SHORT).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.mqttclient, menu);
return true;
}
/*public class BackTask extends AsyncTask<Void, Void, Void>{
private MqttClient client;
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
try {
client = new MqttClient("tcp://"Ip of machine running RSMB":1883", "ANDROID1", new MemoryPersistence());
client.connect();
client.subscribe("House/Kitchen/Bulb");
} catch (MqttException e) {
// TODO Auto-generated catch block
Log.e("ERROR", "NOT CONNECTED");
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
try {
client.setCallback( new MqttCallback() {
@Override
public void messageArrived(MqttTopic arg0, MqttMessage arg1)
throws Exception {
// TODO Auto-generated method stub
Toast.makeText(MQTTClient.this, arg0.toString(), Toast.LENGTH_SHORT).show();
}
@Override
public void deliveryComplete(MqttDeliveryToken arg0) {
// TODO Auto-generated method stub
}
@Override
public void connectionLost(Throwable arg0) {
// TODO Auto-generated method stub
}
});
} catch (MqttException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}*/
这是桌面Java客户端:
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttClientPersistence;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.eclipse.paho.client.mqttv3.MqttPersistenceException;
import org.eclipse.paho.client.mqttv3.MqttTopic;
import org.eclipse.paho.client.mqttv3.internal.MemoryPersistence;
public class MQTTBaseClass {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
MqttClientPersistence persistence;
try {
MqttClient client = new MqttClient("tcp://localhost:1883", "PC",new MemoryPersistence());
MqttConnectOptions conOpts = new MqttConnectOptions();
conOpts.setKeepAliveInterval(30);
conOpts.setWill(client.getTopic("Error"), "something bad happened".getBytes(), 1, true);
client.connect(conOpts);
MqttMessage msg = new MqttMessage("hello".getBytes());
msg.setQos(0);
msg.setRetained(true);
MqttTopic topic = client.getTopic("House/Kitchen/Bulb");
client.subscribe("House/Kitchen/Bulb");
try {
client.setCallback( new MqttCallback() {
@Override
public void messageArrived(MqttTopic arg0, MqttMessage arg1)
throws Exception {
// TODO Auto-generated method stub
System.out.println(arg1.toString());
}
@Override
public void deliveryComplete(MqttDeliveryToken arg0) {
// TODO Auto-generated method stub
}
@Override
public void connectionLost(Throwable arg0) {
// TODO Auto-generated method stub
}
});
} catch (MqttException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
topic.publish(msg);
} catch (MqttPersistenceException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MqttException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
注意事项:
我通过WiFi连接我的android设备,当我运行Java Dekstop客户端时,我的桌面也是如此。
Java Destop客户端与RSMB在同一台机器上运行
Java桌面客户端创建并订阅主题"House/Kitchen/Bulb",并发送带有字符串"Hello"的消息
Android客户端还订阅了"House/Kitchen/Bulb",并尝试在收到消息后显示祝酒词。
我已经在android manifest上添加了Internet权限
android设备似乎可以很好地连接到代理,但是当我初始化Java Desktop Service客户机(或Eclipse中的Paho客户机插件并发布消息)时,我得到了提到的错误。
我在RSMB运行的同一台机器上使用模拟器运行应用程序,并且我得到相同的错误。
可能是什么问题?
更新:最初,我得到了一个"主线程上的网络"异常,所以我将连接操作移动到AsyncTask。现在看来,当我与Java客户端(Asynctask可能已经创建问题)发布消息时,Android客户端仍然连接,但是MqttCallback()的messageArrived()似乎没有被调用。
更新2:我设法使它工作。下面是我现在使用的代码:
package com.example.mqttphone;
*import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.widget.Toast;*
public class Main extends Activity {
protected static String msg;
public MqttClient client;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
client = new MqttClient("tcp://10.1.201.27:1883", "ANDROID1", new MemoryPersistence());
MqttConnectOptions conOpts = new MqttConnectOptions();
conOpts.setKeepAliveInterval(30);
conOpts.setWill(client.getTopic("Error"), "something bad happened".getBytes(), 1, true);
client.setCallback( new MqttCallback() {
@Override
public void connectionLost(Throwable arg0) {
// TODO Auto-generated method stub
}
@Override
public void deliveryComplete(IMqttDeliveryToken arg0) {
// TODO Auto-generated method stub
}
@Override
public void messageArrived(String arg0, MqttMessage arg1)
throws Exception {
// TODO Auto-generated method stub
Main.msg = arg1.toString();
Main.this.runOnUiThread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
Toast.makeText(Main.this, msg, Toast.LENGTH_LONG).show();
}
});
Log.e("MESSAGE RECEIVED", arg1.toString());
}
});
client.connect(conOpts);
//MqttMessage msg = new MqttMessage("ANDROID MESSAGE".getBytes());
//client.getTopic("world").publish(msg);
if(client.isConnected()){
client.subscribe("/House/Kitchen/Bulb");
Toast.makeText(this, "CONNECTED", Toast.LENGTH_SHORT).show();
}
} catch (MqttException e) {
// TODO Auto-generated catch block
Log.e("ERROR", "NOT CONNECTED");
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
你好
我已经使用你的代码,但我不能连接我的paho客户端到我的阿波罗服务器,我得到下面的错误。
I/global(677): Default buffer size used in BufferedOutputStream constructor. It would be better to be explicit if an 8k buffer is required.
E/ERROR(677): NOT CONNECTED
W/System.err(677): (32109) - java.io.EOFException
W/System.err(677): at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:127)
W/System.err(677): at java.lang.Thread.run(Thread.java:1096)
W/System.err(677): Caused by: java.io.EOFException
W/System.err(677): at java.io.DataInputStream.readFully(DataInputStream.java:266)
W/System.err(677): at org.eclipse.paho.client.mqttv3.internal.wire.MqttInputStream.readMqttWireMessage(MqttInputStream.java:63)
W/System.err(677): at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:94)
W/System.err(677): ... 1 more
谢谢
Girish
我让它工作了。这里有一个到github仓库的链接,每个人都可以在其中找到实现此代码的项目。它允许用户通过语音识别远程使用Android设备打开LED灯。