MQTT Paho Client无法自动重新连接到Android Service上的代理

MQTT Paho Client not reconnect automatically to broker on Android Service

我有一个服务来管理我的MQTT客户端连接，MQTT正常运行，但是问题是当我重新启动Broker Server时，Android客户端未重新连接。 onConnectionLost()回调触发异常。

笔记

我在同一台计算机上使用Moquette Broker-> Moquette

我有两个Android客户端应用程序，一个使用Service(有问题)，另一个在不使用Service的线程上工作(这很好，重新连接就可以了)。

我无法运行Android Client MQTT库，因为我正在使用Eclipse Paho MQTT。

是的，我制作setAutomaticReconnect(true);

问题

使用Service的Android应用程序将永远运行，不会重新连接到MQTT Broker。

码

MQTTService.java

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public class MQTTService extends Service implements MqttCallbackExtended {

boolean running;
private static final String TAG ="MQTTService";

public static final String ACTION_MQTT_CONNECTED ="ACTION_MQTT_CONNECTED";
public static final String ACTION_MQTT_DISCONNECTED ="ACTION_MQTT_DISCONNECTED";
public static final String ACTION_DATA_ARRIVED ="ACTION_DATA_ARRIVED";

// MQTT
MqttClient mqttClient;
final String serverURI ="tcp://"+ServidorServices.IP+":1883";
final String clientId ="Responsavel";
String topicoId;
Thread mqttStartThread;

public boolean subscribe(String topic) {
try {
Log.i(TAG,"Subscripe:" + topic);
mqttClient.subscribe(topic);
mqttClient.subscribe("LOCATION_REAL");
return true;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}

// Life Cycle
@Override
public IBinder onBind(Intent intent) {
Log.d(TAG,"onBind()");
return null;
}

@Override
public void onCreate() {
Log.d(TAG,"onCreate()");
running = true;
topicoId = getSharedPreferences("myprefs",MODE_PRIVATE).getString("tag_id_aluno","0");

mqttStartThread = new MQTTStartThread(this);

if(topicoId.equals("0")) {
Log.i(TAG,"Error to subscribe");
return;
}

mqttStartThread.start();
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d(TAG,"onStartCommand()");
return super.onStartCommand(intent, flags, startId);
}

class MQTTStartThread extends Thread {

MqttCallbackExtended mqttCallbackExtended;

public MQTTStartThread(MqttCallbackExtended callbackExtended) {
this.mqttCallbackExtended = callbackExtended;
}

@Override
public void run() {
try {
mqttClient = new MqttClient(serverURI,clientId,new MemoryPersistence());
MqttConnectOptions options = new MqttConnectOptions();
options.setAutomaticReconnect(true);
options.setCleanSession(true);
mqttClient.setCallback(mqttCallbackExtended);
mqttClient.connect();
} catch (Exception e) {
Log.i(TAG,"Exception MQTT CONNECT:" + e.getMessage());
e.printStackTrace();
}
}
}

@Override
public void onDestroy() {
Log.d(TAG,"onDestroy()");
running = false;
if (mqttClient != null) {
try {
if (mqttClient.isConnected()) mqttClient.disconnect();
} catch (Exception e) {
e.printStackTrace();
}
}
}

@Override
public boolean onUnbind(Intent intent) {
Log.i(TAG,"onUnbind()");
return super.onUnbind(intent);
}

// Callbacks MQTT
@Override
public void connectComplete(boolean reconnect, String serverURI) {
Log.i(TAG,"connectComplete()");
if (topicoId == null) {
Log.i(TAG,"Erro ao ler ID da Tag");
return;
}
sendBroadcast(new Intent(ACTION_MQTT_CONNECTED));
subscribe(topicoId);
}

@Override
public void connectionLost(Throwable cause) {
Log.i(TAG,"connectionLost():" + cause.getMessage());
cause.printStackTrace();
sendBroadcast(new Intent(ACTION_MQTT_DISCONNECTED));
}

@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
Log.i(TAG,"messageArrived() topic:" + topic);

if (topic.equals("LOCATION_REAL")) {
Log.i(TAG,"Data:" + new String(message.getPayload()));
} else {
Context context = MQTTService.this;
String data = new String(message.getPayload());
Intent intent = new Intent(context,MapsActivity.class);
intent.putExtra("location",data);
LatLng latLng = new LatLng(Double.valueOf(data.split("_")[0]),Double.valueOf(data.split("_")[1]));
String lugar = Utils.getAddressFromLatLng(latLng,getApplicationContext());
NotificationUtil.create(context,intent,"Embarque",lugar,1);

if (data.split("_").length < 3) {
return;
}

double latitude = Double.valueOf(data.split("_")[0]);
double longitude = Double.valueOf(data.split("_")[1]);
String horario = data.split("")[2];

Intent iMqttBroadcast = new Intent(ACTION_DATA_ARRIVED);
iMqttBroadcast.putExtra("topico",String.valueOf(topic));
iMqttBroadcast.putExtra("latitude",latitude);
iMqttBroadcast.putExtra("longitude",longitude);
iMqttBroadcast.putExtra("evento","Embarcou");
iMqttBroadcast.putExtra("horario",horario);

sendBroadcast(iMqttBroadcast);
}
}

@Override
public void deliveryComplete(IMqttDeliveryToken token) {
Log.i(TAG,"deliveryComplete()");
}
}

Exception Stacktrace

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I/MQTTService: connectionLost(): Connection lost
W/System.err: Connection lost (32109) - java.io.EOFException
W/System.err: at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:146)
W/System.err: at java.lang.Thread.run(Thread.java:818)
W/System.err: Caused by: java.io.EOFException
W/System.err: at java.io.DataInputStream.readByte(DataInputStream.java:77)
W/System.err: at org.eclipse.paho.client.mqttv3.internal.wire.MqttInputStream.readMqttWireMessage(MqttInputStream.java:65)
W/System.err: at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:107)
W/System.err: ... 1 more

我认为您忘记了在MqttClient对象中包含MqttConnectOptions。

请尝试以下

mqttClient.connect(options);

代替

mqttClient.connect();

希望它可以解决您的重新连接问题。

如方法说明所述。

1	options.setAutomaticReconnect(true);

客户端将尝试重新连接到服务器。在尝试重新连接之前，它最初将等待1秒钟，对于每次失败的重新连接尝试，延迟将增加一倍，直到2分钟为止，此时延迟将保持2分钟。

另一个选择是在连接丢失事件的情况下，您可以管理重试间隔。