From ee709450564299831dc90e648f6f11bb9e19b6d0 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Thu, 11 Nov 2021 20:44:24 -0800
Subject: Support new GT06 variation

---
 .../java/org/traccar/protocol/Gt06ProtocolDecoder.java | 18 ++++++++++--------
 .../org/traccar/protocol/Gt06ProtocolDecoderTest.java  |  3 +++
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java b/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
index 45218aba2..0dcdab892 100644
--- a/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
@@ -56,7 +56,7 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
 
     public static final int MSG_LOGIN = 0x01;
     public static final int MSG_GPS = 0x10;
-    public static final int MSG_LBS = 0x11;
+    public static final int MSG_GPS_LBS_6 = 0x11;
     public static final int MSG_GPS_LBS_1 = 0x12;
     public static final int MSG_GPS_LBS_2 = 0x22;
     public static final int MSG_GPS_LBS_3 = 0x37;
@@ -124,6 +124,7 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
             case MSG_GPS_LBS_3:
             case MSG_GPS_LBS_4:
             case MSG_GPS_LBS_5:
+            case MSG_GPS_LBS_6:
             case MSG_GPS_LBS_STATUS_1:
             case MSG_GPS_LBS_STATUS_2:
             case MSG_GPS_LBS_STATUS_3:
@@ -141,13 +142,13 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
 
     private static boolean hasLbs(int type) {
         switch (type) {
-            case MSG_LBS:
             case MSG_LBS_STATUS:
             case MSG_GPS_LBS_1:
             case MSG_GPS_LBS_2:
             case MSG_GPS_LBS_3:
             case MSG_GPS_LBS_4:
             case MSG_GPS_LBS_5:
+            case MSG_GPS_LBS_6:
             case MSG_GPS_LBS_STATUS_1:
             case MSG_GPS_LBS_STATUS_2:
             case MSG_GPS_LBS_STATUS_3:
@@ -275,7 +276,7 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
         return true;
     }
 
-    private boolean decodeLbs(Position position, ByteBuf buf, boolean hasLength) {
+    private boolean decodeLbs(Position position, ByteBuf buf, int type, boolean hasLength) {
 
         int length = 0;
         if (hasLength) {
@@ -296,10 +297,11 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
         }
 
         int mcc = buf.readUnsignedShort();
-        int mnc = BitUtil.check(mcc, 15) ? buf.readUnsignedShort() : buf.readUnsignedByte();
+        int mnc = BitUtil.check(mcc, 15) || type == MSG_GPS_LBS_6 ? buf.readUnsignedShort() : buf.readUnsignedByte();
+        int lac = buf.readUnsignedShort();
+        long cid = type == MSG_GPS_LBS_6 ? buf.readUnsignedInt() : buf.readUnsignedMedium();
 
-        position.setNetwork(new Network(CellTower.from(
-                BitUtil.to(mcc, 15), mnc, buf.readUnsignedShort(), buf.readUnsignedMedium())));
+        position.setNetwork(new Network(CellTower.from(BitUtil.to(mcc, 15), mnc, lac, cid)));
 
         if (length > 9) {
             buf.skipBytes(length - 9);
@@ -885,7 +887,7 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
         }
 
         if (hasLbs(type)) {
-            decodeLbs(position, buf, hasStatus(type));
+            decodeLbs(position, buf, type, hasStatus(type));
         }
 
         if (hasStatus(type)) {
@@ -1053,7 +1055,7 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
                 getLastLocation(position, position.getDeviceTime());
             }
 
-            if (decodeLbs(position, buf, true)) {
+            if (decodeLbs(position, buf, type, true)) {
                 position.set(Position.KEY_RSSI, buf.readUnsignedByte());
             }
 
diff --git a/src/test/java/org/traccar/protocol/Gt06ProtocolDecoderTest.java b/src/test/java/org/traccar/protocol/Gt06ProtocolDecoderTest.java
index 3caba32e6..d2d090c04 100644
--- a/src/test/java/org/traccar/protocol/Gt06ProtocolDecoderTest.java
+++ b/src/test/java/org/traccar/protocol/Gt06ProtocolDecoderTest.java
@@ -17,6 +17,9 @@ public class Gt06ProtocolDecoderTest extends ProtocolTest {
         verifyNull(decoder, binary(
                 "78780D01086471700328358100093F040D0A"));
 
+        verifyNotNull(decoder, binary(
+                "78782111150b0b022c30c804b7af7808810cb0003c00012e02d075df0084890c000679950d0a"));
+
         verifyNotNull(decoder, binary(
                 "797900377000000001020035000103002c0004616219d00043000b013601048153931500001a0001000808652820400643521000000101004e46760d0a"));
 
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