Switched from Moquette's MQTT codec to Netty's MQTT codec ones

broker/src/main/java/io/moquette/spi/impl/Utils.java

@@ -1,11 +1,16 @@
 package io.moquette.spi.impl;
 
+import io.netty.buffer.ByteBuf;
+import io.netty.handler.codec.mqtt.MqttMessage;
+import io.netty.handler.codec.mqtt.MqttMessageIdVariableHeader;
+
 import java.util.Map;
 
 /**
  * Utility static methods, like Map get with default value, or elvis operator.
  */
 public class Utils {
+
     public static <T, K> T defaultGet(Map<K, T> map, K key, T defaultValue) {
         T value = map.get(key);
         if (value != null) {
@@ -13,4 +18,16 @@ public class Utils {
         }
         return defaultValue;
     }
+
+    public static int messageId(MqttMessage msg) {
+        return ((MqttMessageIdVariableHeader) msg.variableHeader()).messageId();
+    }
+
+    public static byte[] readBytesAndRewind(ByteBuf payload) {
+        byte[] payloadContent = new byte[payload.readableBytes()];
+        int mark = payload.readerIndex();
+        payload.readBytes(payloadContent);
+        payload.readerIndex(mark);
+        return payloadContent;
+    }
 }