From 8e85055a38ed46d6f4d29f5e96adc8af4252bc7b Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Mon, 29 May 2017 07:30:35 +1200
Subject: Implement GT06 string format

---
 src/org/traccar/protocol/Gt06ProtocolDecoder.java  | 52 +++++++++++++++++++---
 .../traccar/protocol/Gt06ProtocolDecoderTest.java  |  3 ++
 2 files changed, 50 insertions(+), 5 deletions(-)

diff --git a/src/org/traccar/protocol/Gt06ProtocolDecoder.java b/src/org/traccar/protocol/Gt06ProtocolDecoder.java
index ef2237ad1..261278539 100644
--- a/src/org/traccar/protocol/Gt06ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gt06ProtocolDecoder.java
@@ -70,6 +70,7 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
     public static final int MSG_COMMAND_1 = 0x81;
     public static final int MSG_COMMAND_2 = 0x82;
     public static final int MSG_INFO = 0x94;
+    public static final int MSG_STRING_INFO = 0x21;
 
     private static boolean isSupported(int type) {
         return hasGps(type) || hasLbs(type) || hasStatus(type);
@@ -238,6 +239,33 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
         return position;
     }
 
+    private static final Pattern PATTERN_LOCATION = new PatternBuilder()
+            .text("Current position!")
+            .number("Lat:([NS])(d+.d+),")        // latitude
+            .number("Lon:([EW])(d+.d+),")        // longitude
+            .text("Course:").number("(d+.d+),")  // course
+            .text("Speed:").number("(d+.d+),")   // speed
+            .text("DateTime:")
+            .number("(dddd)-(dd)-(dd)  ")        // date
+            .number("(dd):(dd):(dd)")            // time
+            .compile();
+
+    private Position decodeLocationString(Position position, String sentence) {
+        Parser parser = new Parser(PATTERN_LOCATION, sentence);
+        if (!parser.matches()) {
+            return null;
+        }
+
+        position.setValid(true);
+        position.setLatitude(parser.nextCoordinate(Parser.CoordinateFormat.HEM_DEG));
+        position.setLongitude(parser.nextCoordinate(Parser.CoordinateFormat.HEM_DEG));
+        position.setCourse(parser.nextDouble());
+        position.setSpeed(parser.nextDouble());
+        position.setTime(parser.nextDateTime(Parser.DateTimeFormat.YMD_HMS));
+
+        return position;
+    }
+
     protected Object decodeBasic(Channel channel, SocketAddress remoteAddress, ChannelBuffer buf) throws Exception {
 
         int length = buf.readUnsignedByte();
@@ -358,15 +386,28 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
             return null;
         }
 
+        Position position = new Position();
+        position.setDeviceId(deviceSession.getDeviceId());
+        position.setProtocol(getProtocolName());
+
         buf.readUnsignedShort(); // length
         int type = buf.readUnsignedByte();
 
-        if (type == MSG_INFO) {
-            int subType = buf.readUnsignedByte();
+        if (type == MSG_STRING_INFO) {
 
-            Position position = new Position();
-            position.setDeviceId(deviceSession.getDeviceId());
-            position.setProtocol(getProtocolName());
+            buf.readUnsignedInt(); // server flag
+            String data;
+            if (buf.readUnsignedByte() == 1) {
+                data = buf.readBytes(buf.readableBytes() - 6).toString(StandardCharsets.US_ASCII);
+            } else {
+                data = buf.readBytes(buf.readableBytes() - 6).toString(StandardCharsets.UTF_16BE);
+            }
+
+            return decodeLocationString(position, data);
+
+        } else if (type == MSG_INFO) {
+
+            int subType = buf.readUnsignedByte();
 
             getLastLocation(position, null);
 
@@ -389,6 +430,7 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
                         buf.readerIndex(), buf.readableBytes() - 4 - 2, StandardCharsets.US_ASCII));
 
             }
+
         }
 
         return null;
diff --git a/test/org/traccar/protocol/Gt06ProtocolDecoderTest.java b/test/org/traccar/protocol/Gt06ProtocolDecoderTest.java
index 7893b459a..ad1ec6d47 100644
--- a/test/org/traccar/protocol/Gt06ProtocolDecoderTest.java
+++ b/test/org/traccar/protocol/Gt06ProtocolDecoderTest.java
@@ -16,6 +16,9 @@ public class Gt06ProtocolDecoderTest extends ProtocolTest {
         verifyNull(decoder, binary(
                 "78780D01086471700328358100093F040D0A"));
 
+        verifyPosition(decoder, binary(
+                "7979007121000000000143757272656e7420706f736974696f6e214c61743a4e35342e3733393333322c4c6f6e3a4532352e3237333237302c436f757273653a3132362e35332c53706565643a302e303030302c4461746554696d653a323031372d30352d3236202031303a32373a3437000bbee30d0a"));
+
         verifyAttributes(decoder, binary(
                 "7979003F940D110315102A202141494F494C2C30322C3030382E3239302C3032392E3630302C3531394A2C303430302C3030382E3433302C302C30302C4142001678EA0D0A"));
 
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