增加心跳包原文显示

src/main/java/com/iot/modbus_rtcp/netty/ModbusDecoder.java

@@ -65,7 +65,7 @@ public class ModbusDecoder extends ByteToMessageDecoder {
         ModbusCommandDto message = channel.getCurrentMessage();
 
         if (message == null) {
-            log.warn("非法传输：{}", HexUtil.bytesToHexString(b));
+            log.warn("非法传输：{}，原报文：{}", HexUtil.bytesToHexString(b),new String(b));
             return;
         }