Fixed bug in the calculation of payload site in publish decoder due to bad startPos recording

netty_parser/src/main/java/org/dna/mqtt/moquette/parser/netty/PublishDecoder.java

@@ -18,9 +18,9 @@ class PublishDecoder extends DemuxDecoder {
 
     @Override
     void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
-        LOG.debug("decode invoked with buffer " + in);
-        int startPos = in.readerIndex();
+        LOG.info("decode invoked with buffer " + in);
         in.resetReaderIndex();
+        int startPos = in.readerIndex();
 
         //Common decoding part
         PublishMessage message = new PublishMessage();