From d979ab718ff043c6ec6b815e9833621b9fe0e566 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton@traccar.org>
Date: Fri, 4 Aug 2023 17:12:49 -0700
Subject: Support JC400 alarm messages

---
 .../org/traccar/protocol/Gt06ProtocolDecoder.java  | 37 ++++++++++++++++++----
 .../traccar/protocol/Gt06ProtocolDecoderTest.java  |  4 +++
 2 files changed, 34 insertions(+), 7 deletions(-)

(limited to 'src')

diff --git a/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java b/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
index 4762fc884..53c812bb7 100644
--- a/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
@@ -121,6 +121,7 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
         STANDARD,
         OBD6,
         WETRUST,
+        JC400,
     }
 
     private Variant variant;
@@ -269,12 +270,12 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
     }
 
     public static boolean decodeGps(Position position, ByteBuf buf, boolean hasLength, TimeZone timezone) {
-        return decodeGps(position, buf, hasLength, true, true, timezone);
+        return decodeGps(position, buf, hasLength, true, true, false, timezone);
     }
 
     public static boolean decodeGps(
             Position position, ByteBuf buf, boolean hasLength, boolean hasSatellites,
-            boolean hasSpeed, TimeZone timezone) {
+            boolean hasSpeed, boolean longSpeed, TimeZone timezone) {
 
         DateBuilder dateBuilder = new DateBuilder(timezone)
                 .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
@@ -293,7 +294,8 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
         double longitude = buf.readUnsignedInt() / 60.0 / 30000.0;
 
         if (hasSpeed) {
-            position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
+            position.setSpeed(UnitsConverter.knotsFromKph(
+                    longSpeed ? buf.readUnsignedShort() : buf.readUnsignedByte()));
         }
 
         int flags = buf.readUnsignedShort();
@@ -928,24 +930,44 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
 
             boolean extendedAlarm = dataLength > 7;
             if (extendedAlarm) {
-                decodeGps(position, buf, false, false, false, deviceSession.get(DeviceSession.KEY_TIMEZONE));
+                if (variant == Variant.JC400) {
+                    buf.readUnsignedShort(); // marker
+                    buf.readUnsignedByte(); // version
+                }
+                decodeGps(
+                        position, buf, false,
+                        variant == Variant.JC400, variant == Variant.JC400, variant == Variant.JC400,
+                        deviceSession.get(DeviceSession.KEY_TIMEZONE));
             } else {
                 DateBuilder dateBuilder = new DateBuilder((TimeZone) deviceSession.get(DeviceSession.KEY_TIMEZONE))
                         .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
                         .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
                 getLastLocation(position, dateBuilder.getDate());
             }
-            short alarmType = buf.readUnsignedByte();
-            switch (alarmType) {
+            if (variant == Variant.JC400) {
+                position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.1);
+            }
+            short event = buf.readUnsignedByte();
+            position.set(Position.KEY_EVENT, event);
+            switch (event) {
                 case 0x01:
                     position.set(Position.KEY_ALARM, extendedAlarm ? Position.ALARM_SOS : Position.ALARM_GENERAL);
                     break;
+                case 0x0E:
+                    position.set(Position.KEY_ALARM, Position.ALARM_LOW_POWER);
+                    break;
+                case 0x76:
+                    position.set(Position.KEY_ALARM, Position.ALARM_TEMPERATURE);
+                    break;
                 case 0x80:
                     position.set(Position.KEY_ALARM, Position.ALARM_VIBRATION);
                     break;
                 case 0x87:
                     position.set(Position.KEY_ALARM, Position.ALARM_OVERSPEED);
                     break;
+                case 0x88:
+                    position.set(Position.KEY_ALARM, Position.ALARM_POWER_CUT);
+                    break;
                 case 0x90:
                     position.set(Position.KEY_ALARM, Position.ALARM_ACCELERATION);
                     break;
@@ -959,7 +981,6 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
                     position.set(Position.KEY_ALARM, Position.ALARM_ACCIDENT);
                     break;
                 default:
-                    position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
                     break;
             }
 
@@ -1432,6 +1453,8 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
             variant = Variant.OBD6;
         } else if (header == 0x7878 && type == MSG_GPS_LBS_1 && length == 0x29) {
             variant = Variant.WETRUST;
+        } else if (header == 0x7878 && type == MSG_ALARM && buf.getUnsignedShort(buf.readerIndex() + 4) == 0xffff) {
+            variant = Variant.JC400;
         } else {
             variant = Variant.STANDARD;
         }
diff --git a/src/test/java/org/traccar/protocol/Gt06ProtocolDecoderTest.java b/src/test/java/org/traccar/protocol/Gt06ProtocolDecoderTest.java
index 40f268a9d..9b196e501 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(
+                "78785995ffff01170719152013df0163d45f041ee52018be002f00876900004556454e545f3836323739383035303137353131325f30303030303030305f323032335f30375f32355f31385f33325f30355f31342e6d70340119d15a0d0a"),
+                Position.KEY_EVENT, 0x69);
+
         verifyAttribute(decoder, binary(
                 "787829a01707150f2d0ecd01635100041e96d000087c02d4020000912e000000000718798d000e0006ed3ce50d0a"),
                 Position.KEY_IGNITION, false);
-- 
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