How to set the timeout for a MQTT client?

Question

I'm using the IA92 Java implementation for MQTT, which allows me to connect to a MQTT broker. In order to establish the connection, I'm doing something like this:

// Create connection spec
String mqttConnSpec = "tcp://the_server@the_port";
// Create the client and connect
mqttClient = MqttClient.createMqttClient(mqttConnSpec, null);
mqttClient.connect("the_id", true, 666);

The problem is that sometimes the server takes too much time to send a response, and it throws a timeout exception:

org.apache.harmony.luni.platform.OSNetworkSystem.connectStreamWithTimeoutSocket(OSNetworkSystem.java:130)
  at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:246)
  at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:533)
  at java.net.Socket.connect(Socket.java:1055)
  at com.ibm.mqtt.j2se.MqttJava14NetSocket.<init>((null):-1)
  at com.ibm.mqtt.j2se.MqttJavaNetSocket.setConnection((null):-1)
  at com.ibm.mqtt.Mqtt.tcpipConnect((null):-1)
  at com.ibm.mqtt.MqttBaseClient.doConnect((null):-1)
  at com.ibm.mqtt.MqttBaseClient.connect((null):-1)
  at com.ibm.mqtt.MqttClient.connect((null):-1)
  at com.ibm.mqtt.MqttClient.connect((null):-1)

What I need to do is setting a timeout manually, instead of letting the mqtt client decide that. The documentation says: There are also methods for setting attributes of the MQ Telemetry Transport connection, such as timeouts and retries.

But, honestly, I haven't found anything about it. I have taken a look at the whole javadoc reference and there's no evidence of timeout configuration. I can't see the source code since it's not open source.

So how can I set the timeout for the Mqtt connection?

Solution

If you have confusion you can go to MqttConnectionOptions for detail.

    String userName="Ohelig";
    String password="Pojke";
    MqttClient client = new MqttClient("tcp://192.168.1.4:1883","Sending");      
    MqttConnectOptions authen = new MqttConnectOptions();
    authen.setUserName(userName);
    authen.setPassword(password.toCharArray());
    authen.setKeepAliveInterval(30);
    authen.setConnectionTimeout(300);

    client.connect(authen);