From 2ab6df0a53e299f5cd6ef880c70054547d07fe42 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton@traccar.org>
Date: Thu, 22 Feb 2024 07:17:51 -0800
Subject: Fix SL44/SL48 alarms decoding

---
 src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java | 13 +++++++++----
 .../java/org/traccar/protocol/Gt06ProtocolDecoderTest.java  |  4 ++++
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java b/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
index 7ee47dd86..6c0380278 100644
--- a/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 - 2022 Anton Tananaev (anton@traccar.org)
+ * Copyright 2012 - 2024 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.
@@ -344,7 +344,7 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
 
         int mcc = buf.readUnsignedShort();
         int mnc;
-        if (BitUtil.check(mcc, 15) || type == MSG_GPS_LBS_6) {
+        if (BitUtil.check(mcc, 15) || type == MSG_GPS_LBS_6 || variant == Variant.SL4X) {
             mnc = buf.readUnsignedShort();
         } else {
             mnc = buf.readUnsignedByte();
@@ -441,15 +441,18 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
                 return Position.ALARM_REMOVING;
             case 0x23:
                 return Position.ALARM_FALL_DOWN;
+            case 0x28:
+                return Position.ALARM_BRAKING;
             case 0x29:
                 return Position.ALARM_ACCELERATION;
-            case 0x30:
-                return Position.ALARM_BRAKING;
             case 0x2A:
             case 0x2B:
+            case 0x2E:
                 return Position.ALARM_CORNERING;
             case 0x2C:
                 return Position.ALARM_ACCIDENT;
+            case 0x30:
+                return Position.ALARM_JAMMING;
             default:
                 return null;
         }
@@ -1477,6 +1480,8 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
             variant = Variant.JC400;
         } else if (header == 0x7878 && type == MSG_LBS_3 && length == 0x37) {
             variant = Variant.SL4X;
+        } else if (header == 0x7878 && type == MSG_GPS_LBS_STATUS_4 && length == 0x27) {
+            variant = Variant.SL4X;
         } else if (header == 0x7878 && type == MSG_GPS_LBS_2 && length == 0x2f) {
             variant = Variant.SEEWORLD;
         } else if (header == 0x7878 && type == MSG_GPS_LBS_STATUS_1 && length == 0x26) {
diff --git a/src/test/java/org/traccar/protocol/Gt06ProtocolDecoderTest.java b/src/test/java/org/traccar/protocol/Gt06ProtocolDecoderTest.java
index be8f4f5ef..04d7fafb3 100644
--- a/src/test/java/org/traccar/protocol/Gt06ProtocolDecoderTest.java
+++ b/src/test/java/org/traccar/protocol/Gt06ProtocolDecoderTest.java
@@ -17,6 +17,10 @@ public class Gt06ProtocolDecoderTest extends ProtocolTest {
         verifyNull(decoder, binary(
                 "78780D01086471700328358100093F040D0A"));
 
+        verifyAttribute(decoder, binary(
+                "78782732180214123324ca0162bdf0041f45d900190b0a02d4000bc5270000ec025206040202005e07e10d0a"),
+                Position.KEY_ALARM, Position.ALARM_POWER_CUT);
+
         verifyAttribute(decoder, binary(
                 "78782616170A080C0E24C0027C58AD0C2B8B0100454E0901CC0025030328E7A0005D4B13021EC373170D0A"),
                 Position.KEY_BATTERY_LEVEL, 93);
-- 
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