From b90dfecfdc127d1870f5f61db177f8d63fb9a095 Mon Sep 17 00:00:00 2001
From: Anshul Jain <anshuljain1985@gmail.com>
Date: Mon, 28 Aug 2017 11:15:03 +0530
Subject: Fix for Gt06 GPS data length can not be greater than 12. Fix for
 Alarm packet LBS length skip for 9.

---
 src/org/traccar/protocol/Gt06ProtocolDecoder.java | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/org/traccar/protocol/Gt06ProtocolDecoder.java b/src/org/traccar/protocol/Gt06ProtocolDecoder.java
index d8da7e6de..dbbaeaf03 100644
--- a/src/org/traccar/protocol/Gt06ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gt06ProtocolDecoder.java
@@ -182,6 +182,9 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
         }
 
         if (length > 0) {
+            if (length > 12) {
+                length = 12;
+            }
             buf.skipBytes(length - 12); // skip reserved
         }
 
@@ -202,7 +205,11 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
                 buf.readUnsignedShort(), buf.readUnsignedByte(), buf.readUnsignedShort(), buf.readUnsignedMedium())));
 
         if (length > 0) {
-            buf.skipBytes(length - 8);
+            if (hasLength) {
+                buf.skipBytes(length - 9);
+            } else {
+                buf.skipBytes(length - 8);
+            }
         }
 
         return true;
-- 
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