Clean up TranSync decoder

2 files changed, 82 insertions, 150 deletions

diff --git a/src/main/java/org/traccar/protocol/TranSyncProtocol.java b/src/main/java/org/traccar/protocol/TranSyncProtocol.java
index 5422380b6..fcc02a781 100644
--- a/src/main/java/org/traccar/protocol/TranSyncProtocol.java
+++ b/src/main/java/org/traccar/protocol/TranSyncProtocol.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2013 - 2023 Anton Tananaev (anton@traccar.org)
+ * Copyright 2023 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,9 +30,10 @@ public class TranSyncProtocol extends BaseProtocol {
         addServer(new TrackerServer(config, getName(), false) {
             @Override
             protected void addProtocolHandlers(PipelineBuilder pipeline, Config config) {
-                pipeline.addLast(new LengthFieldBasedFrameDecoder(256, 2, 1, 2, 0, true));
+                pipeline.addLast(new LengthFieldBasedFrameDecoder(256, 2, 1, 2, 0));
                 pipeline.addLast(new TranSyncProtocolDecoder(TranSyncProtocol.this));
             }
         });
     }
+
 }
diff --git a/src/main/java/org/traccar/protocol/TranSyncProtocolDecoder.java b/src/main/java/org/traccar/protocol/TranSyncProtocolDecoder.java
index 130c916b1..816b5d2cf 100644
--- a/src/main/java/org/traccar/protocol/TranSyncProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/TranSyncProtocolDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2013 - 2023 Anton Tananaev (anton@traccar.org)
+ * Copyright 2023 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -29,118 +29,32 @@ import org.traccar.model.Position;
 import org.traccar.session.DeviceSession;
 
 import java.net.SocketAddress;
-import java.util.Arrays;
 
 public class TranSyncProtocolDecoder extends BaseProtocolDecoder {
 
-    private static final byte[] STX = new byte[]{0x3a, 0x3a};
-
-    private String getHardwareType(int type) {
-
-        switch (type) {
-            case 1:
-                return  "basic";
-            case 2:
-                return "asset";
-            case 3:
-                return "bike";
-            case 4:
-                return "serial";
-            case 5:
-                return "obd";
-            case 6:
-                return "l1";
-            case 7:
-                return "ais-140";
-            default:
-                return "unknown";
-        }
-    }
-
     public TranSyncProtocolDecoder(Protocol protocol) {
         super(protocol);
     }
 
-    protected void decodeAlarm(Position position, int value) {
+    private String decodeAlarm(int value) {
         switch (value) {
+            case 4:
+                return Position.ALARM_LOW_BATTERY;
+            case 6:
+                return Position.ALARM_POWER_RESTORED;
             case 10:
-                position.set(Position.KEY_ALARM, Position.ALARM_SOS);
-                break;
-            case 11:
-                position.set(Position.KEY_EVENT, 11);
-                break;
-            case 16:
-                position.set(Position.KEY_EVENT, 16);
-                break;
-            case 3:
-                position.set(Position.KEY_ALARM, 3);
-                break;
-            case 22:
-                position.set(Position.KEY_ALARM, 22);
-                break;
-            case 9:
-                position.set(Position.KEY_EVENT, 9);
-            case 17:
-                position.set(Position.KEY_ALARM, Position.ALARM_OVERSPEED);
-                break;
+                return Position.ALARM_SOS;
             case 13:
-                position.set(Position.KEY_ALARM, Position.ALARM_BRAKING);
-                break;
+                return Position.ALARM_BRAKING;
             case 14:
-                position.set(Position.KEY_ALARM, Position.ALARM_ACCELERATION);
-                break;
-            case 15:
-                position.set(Position.KEY_EVENT, 15);
-                break;
+                return Position.ALARM_ACCELERATION;
+            case 17:
+                return Position.ALARM_OVERSPEED;
             case 23:
-                position.set(Position.KEY_ALARM, Position.ALARM_ACCIDENT);
-                break;
-            case 12:
-                position.set(Position.KEY_EVENT, 12);
-                break;
-            case 6:
-                position.set(Position.KEY_ALARM, Position.ALARM_POWER_RESTORED);
-                break;
-            case 4:
-                position.set(Position.KEY_ALARM, Position.ALARM_LOW_BATTERY);
-                break;
-            case 5:
-                position.set(Position.KEY_EVENT, 5);
-                break;
+                return Position.ALARM_ACCIDENT;
             default:
-                position.set(Position.KEY_EVENT, "unknown");
-        }
-    }
-    private void analizeNegativePosition(Position position, int value) {
-
-        if (!BitUtil.check(value, 1)) {
-            position.setLatitude(-position.getLatitude()); // 0/1 S/N
-        }
-        if (!BitUtil.check(value, 2)) {
-            position.setLongitude(-position.getLongitude()); // 0/1 W/E
-        }
-    }
-
-    private void decodePowerEngineParameters(Position position, int value) {
-
-        position.set(Position.PREFIX_OUT + 1, BitUtil.check(value, 7));
-        position.set(Position.PREFIX_OUT + 2, BitUtil.check(value, 6));
-        position.set(Position.PREFIX_IN + 3, BitUtil.check(value, 5));
-        if (BitUtil.check(value, 4)) {
-            position.set(Position.KEY_ALARM, Position.ALARM_POWER_OFF);
-        }
-        position.set(Position.KEY_IGNITION, BitUtil.check(value, 3));
-        position.set("gpsFix", BitUtil.check(value, 0));
-    }
-
-    private void decodeTrackerStatusParameters(Position position, int value) {
-        if (BitUtil.check(value, 7)) {
-            position.set(Position.KEY_ARCHIVE, true);
-        }
-        if (BitUtil.check(value, 5)) {
-            position.set(Position.KEY_ALARM, Position.ALARM_GPS_ANTENNA_CUT);
+                return null;
         }
-        position.set(Position.KEY_VERSION_HW, getHardwareType(BitUtil.between(value, 0, 3)));
     }
 
     @Override
@@ -148,88 +62,105 @@ public class TranSyncProtocolDecoder extends BaseProtocolDecoder {
 
         ByteBuf buf = (ByteBuf) msg;
 
-        if (Arrays.equals(ByteBufUtil.getBytes(buf, 0, 2), STX)) {
-            buf.readUnsignedShort();
-        }
-        buf.readByte(); //packetLength
-
-        int locationAreaCode = buf.readUnsignedShort();
-        String deviceId = ByteBufUtil.hexDump(buf.readSlice(8));
+        buf.readUnsignedShort(); // header
+        buf.readByte(); // length
 
-        buf.readUnsignedShort(); //informationSerialNumber
-        buf.readUnsignedByte(); //protocolNumber
+        int lac = buf.readUnsignedShort();
 
+        String deviceId = ByteBufUtil.hexDump(buf.readSlice(8));
         DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, deviceId);
         if (deviceSession == null) {
             return null;
         }
+
         Position position = new Position(getProtocolName());
         position.setDeviceId(deviceSession.getDeviceId());
-        position.setValid(true);
+
+        buf.readUnsignedShort(); // index
+        buf.readUnsignedByte(); // type
+
         position.setTime(new DateBuilder()
                 .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
                 .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
                 .getDate());
-        position.setLatitude(buf.readUnsignedInt() / 1800000.0);
-        position.setLongitude(buf.readUnsignedInt() / 1800000.0);
+
+        double latitude = buf.readUnsignedInt() / 1800000.0;
+        double longitude = buf.readUnsignedInt() / 1800000.0;
+
         position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
         position.setCourse(buf.readUnsignedShort());
 
-        int mobileNetworkCode = buf.readUnsignedByte();
-        int cellTowerId = buf.readUnsignedShort();
-        int statusParameters = buf.readUnsignedByte();
+        int mnc = buf.readUnsignedByte();
+        int cid = buf.readUnsignedShort();
+        int status0 = buf.readUnsignedByte();
 
-        decodePowerEngineParameters(position, statusParameters);
-        analizeNegativePosition(position, statusParameters);
+        position.setValid(BitUtil.check(status0, 0));
+        position.setLatitude(BitUtil.check(status0, 1) ? latitude : -latitude);
+        position.setLongitude(BitUtil.check(status0, 2) ? longitude : -longitude);
+
+        position.set(Position.PREFIX_OUT + 1, BitUtil.check(status0, 7));
+        position.set(Position.PREFIX_OUT + 2, BitUtil.check(status0, 6));
+        position.set(Position.PREFIX_IN + 3, BitUtil.check(status0, 5));
+        if (BitUtil.check(status0, 4)) {
+            position.set(Position.KEY_ALARM, Position.ALARM_POWER_OFF);
+        }
+        position.set(Position.KEY_IGNITION, BitUtil.check(status0, 3));
 
         buf.readUnsignedByte(); // reserved
 
-        decodeAlarm(position, buf.readUnsignedByte());
+        int event = buf.readUnsignedByte();
+        position.set(Position.KEY_ALARM, decodeAlarm(event));
+        position.set(Position.KEY_EVENT, event);
 
-        decodeTrackerStatusParameters(position, buf.readUnsignedByte());
+        int status3 = buf.readUnsignedByte();
+        if (BitUtil.check(status3, 7)) {
+            position.set(Position.KEY_ARCHIVE, true);
+        }
+        if (BitUtil.check(status3, 5)) {
+            position.set(Position.KEY_ALARM, Position.ALARM_GPS_ANTENNA_CUT);
+        }
 
-        int gsmSignalStrength = buf.readUnsignedByte();
+        int rssi = buf.readUnsignedByte();
+        CellTower cellTower = CellTower.fromLacCid(getConfig(), lac, cid);
+        cellTower.setMobileNetworkCode(mnc);
+        cellTower.setSignalStrength(rssi);
+        position.setNetwork(new Network(cellTower));
 
         position.set(Position.KEY_BATTERY, (double) (buf.readUnsignedByte() / 10));
         position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
         position.set(Position.KEY_HDOP, buf.readUnsignedByte());
         position.set(Position.PREFIX_ADC + 1, (short) buf.readUnsignedShort());
 
-        CellTower cellTower = CellTower.fromLacCid(getConfig(), locationAreaCode, cellTowerId);
-        cellTower.setMobileNetworkCode(mobileNetworkCode);
-        cellTower.setSignalStrength(gsmSignalStrength);
-
-        position.setNetwork(new Network(cellTower));
-
         if (buf.readableBytes() > 5) {
-            buf.readUnsignedByte(); // odometerIndex
-            int odometerLength = buf.readUnsignedByte();
-            if (odometerLength > 0) {
-                int odometer = buf.readBytes(odometerLength).readInt();
-                position.set(Position.KEY_ODOMETER, odometer);
+            buf.readUnsignedByte(); // odometer id
+            int length = buf.readUnsignedByte();
+            if (length > 0) {
+                position.set(Position.KEY_ODOMETER, buf.readBytes(length).readInt());
             }
-            if ((buf.readableBytes() > 5)) {
-                buf.readUnsignedByte(); // tagIndex
-                int tagLength = buf.readUnsignedByte();
-                if (tagLength > 0) {
-                    position.set("tag", ByteBufUtil.hexDump(buf.readSlice(tagLength)));
-                }
+        }
+        if (buf.readableBytes() > 5) {
+            buf.readUnsignedByte(); // rfid id
+            int length = buf.readUnsignedByte();
+            if (length > 0) {
+                position.set(Position.KEY_DRIVER_UNIQUE_ID, ByteBufUtil.hexDump(buf.readSlice(length)));
             }
-            if ((buf.readableBytes() > 5)) {
-                buf.readUnsignedByte(); // adc2Index
-                int adc2Length = buf.readUnsignedByte();
-                if (adc2Length > 0) {
-                    position.set(Position.PREFIX_ADC + 2, buf.readUnsignedShort());
-                }
+        }
+        if (buf.readableBytes() > 5) {
+            buf.readUnsignedByte(); // adc2 id
+            int length = buf.readUnsignedByte();
+            if (length > 0) {
+                position.set(Position.PREFIX_ADC + 2, buf.readUnsignedShort());
             }
-            if ((buf.readableBytes() > 5)) {
-                buf.readUnsignedByte(); // adc3Index
-                int adc2Length = buf.readUnsignedByte();
-                if (adc2Length > 0 && adc2Length <= buf.readableBytes() - 2) {
-                    position.set(Position.PREFIX_ADC + 3, buf.readUnsignedShort());
-                }
+        }
+        if (buf.readableBytes() > 5) {
+            buf.readUnsignedByte(); // adc3 id
+            int length = buf.readUnsignedByte();
+            if (length > 0 && length <= buf.readableBytes() - 2) {
+                position.set(Position.PREFIX_ADC + 3, buf.readUnsignedShort());
             }
         }
+
         return position;
     }
+
 }