Subscribing to connectionLost outside default MqttCallback

Hi,

I was wondering: is it possible to subscribe to the "connectionLost" event without setting the default message listener (i.e. mqttClient.setCallback(new MqttCallback() ...)?

I am asking because I subscribing to the topics using the "subscribe(topic, qos, IMqttMessageListener)" function. I noticed that, having set CleanSession=false, all pending qos>0 messages will be delivered right after being connected (to the default MqttCallback), but before I have the chance to call the subscribe functions (where I have assigned the handling functions). I also cannot subscribe before the connection is established, otherwise exceptions will be thrown because the "client is not connected". I am not sure if this is an expected behavior, so I was wondering how to be able to use IMqttMessageListener subscriptions and yet still be notified when a connection is lost.