From cf78794053bf2e6890e279c49471a936698bde1f Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sat, 7 Jan 2017 09:49:43 +1300
Subject: Support GT30 alarm messages

---
 src/org/traccar/protocol/Gt30ProtocolDecoder.java  | 22 ++++++++++++++++++++++
 .../traccar/protocol/Gt30ProtocolDecoderTest.java  | 12 ++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/src/org/traccar/protocol/Gt30ProtocolDecoder.java b/src/org/traccar/protocol/Gt30ProtocolDecoder.java
index 19d964687..6c3f8c0a4 100644
--- a/src/org/traccar/protocol/Gt30ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gt30ProtocolDecoder.java
@@ -37,6 +37,7 @@ public class Gt30ProtocolDecoder extends BaseProtocolDecoder {
             .number("x{4}")                      // length
             .expression("(.{14})")               // device id
             .number("x{4}")                      // type
+            .expression("(.)?")                  // alarm
             .number("(dd)(dd)(dd).(d+),")        // time
             .expression("([AV]),")               // validity
             .number("(d+)(dd.d+),")              // latitude
@@ -52,6 +53,23 @@ public class Gt30ProtocolDecoder extends BaseProtocolDecoder {
             .number("x{4}")                      // checksum
             .compile();
 
+    private String decodeAlarm(int value) {
+        switch (value) {
+            case 0x01:
+            case 0x02:
+            case 0x03:
+                return Position.ALARM_SOS;
+            case 0x10:
+                return Position.ALARM_LOW_BATTERY;
+            case 0x11:
+                return Position.ALARM_OVERSPEED;
+            case 0x12:
+                return Position.ALARM_GEOFENCE;
+            default:
+                return null;
+        }
+    }
+
     @Override
     protected Object decode(
             Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
@@ -70,6 +88,10 @@ public class Gt30ProtocolDecoder extends BaseProtocolDecoder {
         position.setProtocol(getProtocolName());
         position.setDeviceId(deviceSession.getDeviceId());
 
+        if (parser.hasNext()) {
+            position.set(Position.KEY_ALARM, decodeAlarm(parser.next().charAt(0)));
+        }
+
         DateBuilder dateBuilder = new DateBuilder()
                 .setTime(parser.nextInt(), parser.nextInt(), parser.nextInt(), parser.nextInt());
 
diff --git a/test/org/traccar/protocol/Gt30ProtocolDecoderTest.java b/test/org/traccar/protocol/Gt30ProtocolDecoderTest.java
index f33875ce1..7b81b1ebe 100644
--- a/test/org/traccar/protocol/Gt30ProtocolDecoderTest.java
+++ b/test/org/traccar/protocol/Gt30ProtocolDecoderTest.java
@@ -10,6 +10,18 @@ public class Gt30ProtocolDecoderTest extends ProtocolTest {
 
         Gt30ProtocolDecoder decoder = new Gt30ProtocolDecoder(new Gt30Protocol());
 
+        verifyPosition(decoder, text(
+                "$$005D3037811014    9955102834.000,A,3802.8629,N,02349.7163,E,0.00,,060117,,*13|1.3|26225BD"));
+
+        verifyPosition(decoder, text(
+                "$$005E3037811014    9999\u0003121909.000,A,3802.9133,N,02349.9354,E,0.00,,060117,,*18|1.8|264518B"));
+
+        verifyPosition(decoder, text(
+                "$$00633037811014    9999\u0002121901.000,A,3802.9137,N,02349.9334,E,2.86,18.16,060117,,*3E|1.8|262D752"));
+
+        verifyPosition(decoder, text(
+                "$$005E3037811014    9999\u0001121849.000,A,3802.9094,N,02349.9384,E,0.00,,060117,,*1C|1.2|2683812"));
+
         verifyPosition(decoder, text(
                 "$$005B3037811124    9955161049.000,A,3802.9474,N,02241.1897,E,0.00,,021115,,*15|2.9|5A639"));
 
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