MqttClient 对象的同步和异步接口不起作用

2022-09-02 22:41:39

我已经创建了一个类型,如下代码所示,我创建了一个客户端并定义了它的.问题是,clientMqttClientAsynchronous callback

1-当我运行程序m时,出现,但我没有收到响应fr0m或来自o,为什么?哇,我在代码中做错了。System.out.println("Client is Connected");onSuccessonFailure

2-i实现了接口,但由于我有一个类型的客户端,我不能使用这个接口。我试图使用,但因为我为java编程,而不是我不能使用它。如何使用界面?static IMqttAsyncClient asynchClientCB = new IMqttAsyncClient()MqttClientIMqttAsyncClientmqttAsynchClienAndroidIMqttAsyncClient

Update_1

在下面的代码“Updated_code_1”中,我稍微修改了代码,但我希望每次我成功连接到同步回调中的消息时都要打印,并且在onnection终止的情况下打印同步clobck中的消息,例如当我故意断开网络时。但是在 ru 时间当我连接到 时,既不支付也不支付任何东西。那么,它们的设计目的是什么呢?brokeronSuccessonFailurebrokeronSuccessonFailur

*Update_2_17_Dec_2014

我有一个查询,可能会引导我们找到解决方案,也就是说,如果我通过有线/无线网络连接到代理,这有什么关系吗?这会改变同步和异步侦听器的行为吗?

Updated_1_code

MqttConnectOptions opts = getClientOptions();
        client = MQTTClientFactory.newClient(broker, port, clientID);

        if (client != null) {
            System.out.println("Client is not Null");
            client.setCallback(AsynchCallBack);
            if (opts != null) {
                iMQTTToken = client.connectWithResult(opts);
                publishMSG(client, TOPIC,"010101".getBytes(), QoS, pub_isRetained);
                iMQTTToken.setActionCallback(synchCallBack);
                if (client.isConnected()) {
                    System.out.println("Client CONNECTED.");
                    publishMSG(client, TOPIC,"010101".getBytes(), QoS, pub_isRetained);
                }
            }
        }
    ....
    ....
    ....
    ....
IMqttToken iMQTTToken = new IMqttToken() {

    @Override
    public void waitForCompletion(long arg0) throws MqttException {
        // TODO Auto-generated method stub
        System.out.println("@waitForCompletion(): waiting " + (arg0 * 1000) + " seconds for connection to be established.");
    }

    @Override
    public void waitForCompletion() throws MqttException {
        // TODO Auto-generated method stub
        System.out.println("@waitForCompletion(): waiting for connection to be established.");
    }

    @Override
    public void setUserContext(Object arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void setActionCallback(IMqttActionListener arg0) {
        // TODO Auto-generated method stub
        arg0.onSuccess(iMQTTToken);
        //System.out.println(" " + arg0.onSuccess());
        //System.out.println(" " + arg0.onSuccess(iMQTTToken));
        iMQTTToken.setActionCallback(synchCallBack);
    }

    @Override
    public boolean isComplete() {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public Object getUserContext() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public String[] getTopics() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public boolean getSessionPresent() {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public MqttWireMessage getResponse() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public int getMessageId() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public int[] getGrantedQos() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public MqttException getException() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public IMqttAsyncClient getClient() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public IMqttActionListener getActionCallback() {
        // TODO Auto-generated method stub
        return null;
    }
};

IMqttActionListener synchCallBack = new IMqttActionListener() {

    @Override
    public void onSuccess(IMqttToken arg0) {
        // TODO Auto-generated method stub
        System.out.println("@onSuccess: Connection Successful.");
    }

    @Override
    public void onFailure(IMqttToken arg0, Throwable arg1) {
        // TODO Auto-generated method stub
        System.out.println("@onFailure: Connection Failed.");
        setViewEnableState(Bconnect, true);
    }
};

MqttCallback AsynchCallBack = new MqttCallback() {

    @Override
    public void messageArrived(String topic, MqttMessage msg) throws Exception {
        // TODO Auto-generated method stub
        System.out.println("@messageArrived: Message Delivered.");
    }

    @Override
    public void deliveryComplete(IMqttDeliveryToken token) {
        // TODO Auto-generated method stub
        System.out.println("@deliveryComplete: Delivery Completed.");
    }

    @Override
    public void connectionLost(Throwable thrw) {
        // TODO Auto-generated method stub
        System.out.println("@Connection Lost: Connection Lost.");
        setViewEnableState(Bconnect, true);
    }
};

新客户端

    MqttConnectOptions opts = new MqttConnectOptions();
    opts.setCleanSession(CS);
    opts.setKeepAliveInterval(KATimer);
    HashMap<Integer, WILL> LWTData = WILLFactory.newWILL("LWT", "LWT MS".getBytes(), 1, false);
    opts.setWill(LWTData.get(0).getWILLTopic(), 
            LWTData.get(0).getWILLPayLoad(), 
            LWTData.get(0).getWILLQoS(), 
            LWTData.get(0).isWILLRetained());

    client = MQTTClientFactory.newClient(IP, PORT, clientID);

    if (client != null) {
        System.out.println("client is not null");

        client.setCallback(AsynchCB);
        IMqttToken token = client.connectWithResult(opts);

        if (client.isConnected()) {
            System.out.println("Client is Connected");

            token.setActionCallback(new IMqttActionListener() {

                public void onSuccess(IMqttToken arg0) {
                    // TODO Auto-generated method stub
                    System.out.println("synchCB->@onSuccess(): Connection Successful");

                    try {
                        client.subscribe(TOPIC, QoS);
                    } catch (MqttException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    try {
                        client.disconnect();
                    } catch (MqttException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }

                public void onFailure(IMqttToken arg0, Throwable arg1) {
                    // TODO Auto-generated method stub
                    System.out.println("synchCB->@onFailure(): Connection Failed");
                }
            });
        }else {
            System.out.println("client is not connected");
        }
    }else {
        System.out.println("client = null");
    }

异步回调

/**
 * Asynchronous Callback to inform the user about events that might happens Asynchronously. If it is not used, any pending 
 * messages destined to the client would not be received.
 */
private static MqttCallback AsynchCB = new MqttCallback() {

    public void messageArrived(String topic, MqttMessage msg) throws Exception {
        // TODO Auto-generated method stub
        System.out.println("AsynchCB->@messageArrived(): ");

        System.out.println("Topic: " + topic);
        System.out.println("MSG: " + msg.toString());

    }

    public void deliveryComplete(IMqttDeliveryToken arg0) {
        // TODO Auto-generated method stub
        System.out.println("AsynchCB->@deliveryComplete(): ");
    }

    public void connectionLost(Throwable arg0) {
        // TODO Auto-generated method stub
        System.out.println("AsynchCB->@connectionLost(): ");
    }
};

答案 1

处理回调的客户端所在的计算机的传出端口可能被计算机的防火墙阻止。


答案 2

如果上一个周期中的连接未成功断开连接,则再次尝试连接将不会提供任何响应。即,如果为已连接的客户端调用连接,则不会产生任何响应。


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