From a79893a68065f4fd1eb684c9df1c346cd7841a83 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sun, 15 Nov 2015 10:09:54 +1300
Subject: Support for GT02 heartbeat messages

---
 src/org/traccar/protocol/Gt02ProtocolDecoder.java  | 46 +++++++++-------------
 .../traccar/protocol/Gt02ProtocolDecoderTest.java  |  5 ++-
 2 files changed, 23 insertions(+), 28 deletions(-)

diff --git a/src/org/traccar/protocol/Gt02ProtocolDecoder.java b/src/org/traccar/protocol/Gt02ProtocolDecoder.java
index 81a04be0a..d15d999cf 100644
--- a/src/org/traccar/protocol/Gt02ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gt02ProtocolDecoder.java
@@ -32,18 +32,6 @@ public class Gt02ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private String readImei(ChannelBuffer buf) {
-        int b = buf.readUnsignedByte();
-        StringBuilder imei = new StringBuilder();
-        imei.append(b & 0x0F);
-        for (int i = 0; i < 7; i++) {
-            b = buf.readUnsignedByte();
-            imei.append((b & 0xF0) >> 4);
-            imei.append(b & 0x0F);
-        }
-        return imei.toString();
-    }
-
     public static final int MSG_HEARTBEAT = 0x1A;
     public static final int MSG_DATA = 0x10;
 
@@ -56,16 +44,30 @@ public class Gt02ProtocolDecoder extends BaseProtocolDecoder {
         buf.skipBytes(2); // header
         buf.readByte(); // size
 
+        Position position = new Position();
+        position.setProtocol(getProtocolName());
+
         // Zero for location messages
-        buf.readByte(); // voltage
-        buf.readByte(); // gsm signal
+        int power = buf.readUnsignedByte();
+        int gsm = buf.readUnsignedByte();
+
+        String imei = ChannelBuffers.hexDump(buf.readBytes(8)).substring(1);
+        if (!identify(imei, channel)) {
+            return null;
+        }
+        position.setDeviceId(getDeviceId());
+
+        position.set(Event.KEY_INDEX, buf.readUnsignedShort());
 
-        String imei = readImei(buf);
-        long index = buf.readUnsignedShort();
         int type = buf.readUnsignedByte();
 
         if (type == MSG_HEARTBEAT) {
 
+            getLastLocation(position, null);
+
+            position.set(Event.KEY_POWER, power);
+            position.set(Event.KEY_GSM, gsm);
+
             if (channel != null) {
                 byte[] response = {0x54, 0x68, 0x1A, 0x0D, 0x0A};
                 channel.write(ChannelBuffers.wrappedBuffer(response));
@@ -73,15 +75,6 @@ public class Gt02ProtocolDecoder extends BaseProtocolDecoder {
 
         } else if (type == MSG_DATA) {
 
-            Position position = new Position();
-            position.setProtocol(getProtocolName());
-            position.set(Event.KEY_INDEX, index);
-
-            if (!identify(imei, channel)) {
-                return null;
-            }
-            position.setDeviceId(getDeviceId());
-
             DateBuilder dateBuilder = new DateBuilder()
                     .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
                     .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
@@ -107,10 +100,9 @@ public class Gt02ProtocolDecoder extends BaseProtocolDecoder {
             position.setLatitude(latitude);
             position.setLongitude(longitude);
 
-            return position;
         }
 
-        return null;
+        return position;
     }
 
 }
diff --git a/test/org/traccar/protocol/Gt02ProtocolDecoderTest.java b/test/org/traccar/protocol/Gt02ProtocolDecoderTest.java
index 4f086d4f3..052187c1d 100644
--- a/test/org/traccar/protocol/Gt02ProtocolDecoderTest.java
+++ b/test/org/traccar/protocol/Gt02ProtocolDecoderTest.java
@@ -10,11 +10,14 @@ public class Gt02ProtocolDecoderTest extends ProtocolDecoderTest {
 
         Gt02ProtocolDecoder decoder = new Gt02ProtocolDecoder(new Gt02Protocol());
 
+        verifyAttributes(decoder, binary(
+                "68681a060303588990500037252de91a010a171a191b171915191e10000d0a"));
+
         verifyPosition(decoder, binary(
                 "68682500000123456789012345000110010101010101026B3F3E026B3F3E000000000000000000010D0A"),
                 position("2001-01-01 01:01:01.000", true, -22.54610, -22.54610));
 
-        verifyNothing(decoder, binary(
+        verifyAttributes(decoder, binary(
                 "6868110603035889905101276600001a0402292d0d0a"));
 
         verifyPosition(decoder, binary(
-- 
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