1 files changed, 6 insertions, 2 deletions
diff --git a/src/main/java/org/traccar/protocol/TramigoFrameDecoder.java b/src/main/java/org/traccar/protocol/TramigoFrameDecoder.java
index e4c94dc77..72cadf21a 100644
--- a/src/main/java/org/traccar/protocol/TramigoFrameDecoder.java
+++ b/src/main/java/org/traccar/protocol/TramigoFrameDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 - 2019 Anton Tananaev (anton@traccar.org)
+ * Copyright 2015 - 2023 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -29,9 +29,13 @@ public class TramigoFrameDecoder extends BaseFrameDecoder {
             return null;
         }
 
+        int protocol = buf.getUnsignedByte(buf.readerIndex());
+
         int length;
-        if (buf.getUnsignedByte(buf.readerIndex()) == 0x80) {
+        if (protocol == 0x80) {
             length = buf.getUnsignedShortLE(buf.readerIndex() + 6);
+        } else if (protocol == 0x02 || protocol == 0x04) {
+            length = buf.getUnsignedShortLE(buf.readerIndex() + 1);
         } else {
             length = buf.getUnsignedShort(buf.readerIndex() + 6);
         }