Android中的Websockets上的MQTT

本文介绍了Android中的Websockets上的MQTT的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在通过Web套接字使用Paho Android Service for MQTT.

I am using Paho Android Service for MQTT over web sockets.

https://www.hivemq.com /blog/mqtt-client-library-enyclopedia-paho-android-service

我的问题是如何设置其中具有查询参数的Broker WSS URI.

My question is how do I set the Broker WSS URI which has a query parameter in it.

例如: wss://test.amazon.com:80/mqtt?query1 = value& query2 = value

修改

如果添加完整的URL，则PAHO客户端库将引发以下异常:

If we add the complete URL, the PAHO client library throws following exception:

MqttException (0) - java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toLowerCase()' on a null object reference
W/System.err:     at org.eclipse.paho.client.mqttv3.internal.ExceptionHelper.createMqttException(ExceptionHelper.java:38)
W/System.err:     at org.eclipse.paho.client.mqttv3.internal.ClientComms$ConnectBG.run(ClientComms.java:664)
W/System.err:     at java.lang.Thread.run(Thread.java:761)
W/System.err: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toLowerCase()' on a null object reference
W/System.err:     at org.eclipse.paho.client.mqttv3.internal.websocket.WebSocketHandshake.receiveHandshakeResponse(WebSocketHandshake.java:133)
W/System.err:     at org.eclipse.paho.client.mqttv3.internal.websocket.WebSocketHandshake.execute(WebSocketHandshake.java:74)
W/System.err:     at org.eclipse.paho.client.mqttv3.internal.websocket.WebSocketSecureNetworkModule.start(WebSocketSecureNetworkModule.java:77)
W/System.err:     at org.eclipse.paho.client.mqttv3.internal.ClientComms$ConnectBG.run(ClientComms.java:650)

编辑2

CLIENT = new MqttAndroidClient(this, "wss://test.amazon.com:80/mqtt?query1=value&query2=value", clientId, new MemoryPersistence());
CLIENT.setCallback(this);

MQTT_CONNECTION_OPTIONS = new MqttConnectOptions();
MQTT_CONNECTION_OPTIONS.setCleanSession(true);

try {
    IMqttToken token = CLIENT.connect(MQTT_CONNECTION_OPTIONS);
    token.setActionCallback(new IMqttActionListener() {
        @Override
        public void onSuccess(IMqttToken asyncActionToken) {
            Log.v("tag", "onsuccess");
        }

        @Override
        public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
            exception.printStackTrace();
        }
    });


} catch (MqttException e) {
    e.printStackTrace();
}

paho

Android中的Websockets上的MQTT

问题描述

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