Merge pull request #748 from rdasgupt/develop

Change MQTTException to IOException for client diconnected state

Author: icraggs

org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/internal/CommsReceiver.java

@@ -165,10 +165,11 @@ public void run() {
 						if (message != null) {
 							// A new message has arrived
 							clientState.notifyReceivedMsg(message);
-						}  else {
+						}  
+                                                else {
                                                     // fix for bug 719
                                                     if (!clientComms.isConnected()) {
-                                                        throw new MqttException(MqttException.REASON_CODE_CONNECTION_LOST);
+                                                         throw new IOException("Connection is lost.");
                                                     }
                                                 }
 					}