Fix issue #30 rewind of message ByteBuffer

broker/src/main/java/org/dna/mqtt/moquette/messaging/spi/impl/ProtocolProcessor.java

@@ -245,15 +245,15 @@ class ProtocolProcessor implements EventHandler<ValueEvent> {
      * */
     private void publish2Subscribers(String topic, AbstractMessage.QOSType qos, ByteBuffer message, boolean retain, Integer messageID) {
         LOG.debug("publish2Subscribers republishing to existing subscribers that matches the topic {}, content", topic);
-        LOG.debug("content <{}>", new String(message.array()));
         if (LOG.isDebugEnabled()) {
+            LOG.debug("content <{}>", DebugUtils.payload2Str(message));
             LOG.debug("subscription tree {}", subscriptions.dumpTree());
         }
         for (final Subscription sub : subscriptions.matches(topic)) {
             if (qos.ordinal() > sub.getRequestedQos().ordinal()) {
                 qos = sub.getRequestedQos();
             }
-            
+            message.rewind();
             LOG.debug("Broker republishing to client <{}> topic <{}> qos <{}>, active {}", 
                     sub.getClientId(), sub.getTopic(), qos, sub.isActive());
             
@@ -298,7 +298,9 @@ class ProtocolProcessor implements EventHandler<ValueEvent> {
         pubMessage.setPayload(message);
         
         LOG.info("send publish message to <{}> on topic <{}>", clientId, topic);
-        LOG.debug("content <{}>", new String(message.array()));
+        if (LOG.isDebugEnabled()) {
+            LOG.debug("content <{}>", DebugUtils.payload2Str(message));
+        }
         if (pubMessage.getQos() != AbstractMessage.QOSType.MOST_ONE) {
             pubMessage.setMessageID(messageID);
         }