无法在Android更高版本中连接MQTT Paho客户端

Question

我无法连接到Android高版本的Mqtt paho客户端。虽然它适用于不到22的api并且能够发布和订阅。
这是我的代码

的build.gradle

repositories {
maven {
    url "https://repo.eclipse.org/content/repositories/paho-releases/"
}


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

MainviewActivity

    String clientId = MqttClient.generateClientId();
     client =
            new MqttAndroidClient(this.getApplicationContext(),  "url",
                    clientId);

    MqttConnectOptions authen = new MqttConnectOptions();
    authen.setKeepAliveInterval(200);

    try {
        if(client.isConnected()){
            Log.e(TAG, "already connected");
        }else {
            Log.e(TAG, "connecting.........");
             token = client.connect(authen);
        }
        token.setActionCallback(new IMqttActionListener() {
            @Override
            public void onSuccess(IMqttToken asyncActionToken) {
                // We are connected
                Log.e(TAG, "onSuccess");
                status.setText("Connected");

            }

            @Override
            public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
                // Something went wrong e.g. connection timeout or firewall problems
                Log.e(TAG, "onFailure");
                status.setText("Not Connected");

            }
        });
    } catch (MqttException e) {
        Log.e(TAG, "Not Connected");
        e.printStackTrace();
    }

AndroidManifest.xml中

 <service android:name="org.eclipse.paho.android.service.MqttService" >
    </service>