From a506293e4196d480cca8149a7269f1e003ff8f7f Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Wed, 19 Dec 2012 22:15:09 +1300
Subject: Added GT02 support (fix #96)

---
 src/org/traccar/protocol/Gt02ProtocolDecoder.java | 140 ++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 src/org/traccar/protocol/Gt02ProtocolDecoder.java

(limited to 'src/org/traccar/protocol/Gt02ProtocolDecoder.java')

diff --git a/src/org/traccar/protocol/Gt02ProtocolDecoder.java b/src/org/traccar/protocol/Gt02ProtocolDecoder.java
new file mode 100644
index 000000000..f6d6d576b
--- /dev/null
+++ b/src/org/traccar/protocol/Gt02ProtocolDecoder.java
@@ -0,0 +1,140 @@
+/*
+ * Copyright 2012 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.protocol;
+
+import java.util.Calendar;
+import java.util.TimeZone;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.traccar.GenericProtocolDecoder;
+import org.traccar.helper.Log;
+import org.traccar.model.DataManager;
+import org.traccar.model.Position;
+
+/**
+ * T55 tracker protocol decoder
+ */
+public class Gt02ProtocolDecoder extends GenericProtocolDecoder {
+
+    /**
+     * Initialize
+     */
+    public Gt02ProtocolDecoder(DataManager dataManager) {
+        super(dataManager);
+    }
+    
+    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();
+    }
+
+    private static final int MSG_HEARTBEAT = 0x1A;
+    private static final int MSG_DATA = 0x10;
+    
+    /**
+     * Decode message
+     */
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, Object msg)
+            throws Exception {
+
+        ChannelBuffer buf = (ChannelBuffer) msg;
+        
+        buf.skipBytes(2); // header
+        buf.readByte(); // size
+        
+        // Zero for location messages
+        buf.readByte(); // voltage
+        buf.readByte(); // gsm signal
+        
+        String imei = readImei(buf);
+        long index = buf.readUnsignedShort();
+        int type = buf.readUnsignedByte();
+        
+        if (type == MSG_HEARTBEAT) {
+            if (channel != null) {
+                byte[] response = {0x54, 0x68, 0x1A, 0x0D, 0x0A};
+                channel.write(ChannelBuffers.wrappedBuffer(response));
+            }
+        }
+        
+        else if (type == MSG_DATA) {
+            
+            // Create new position
+            Position position = new Position();
+            position.setId(index);
+            
+            // Get device id
+            try {
+                position.setDeviceId(getDataManager().getDeviceByImei(imei).getId());
+            } catch(Exception error) {
+                Log.warning("Unknown device - " + imei);
+            }
+            
+            // Date and time
+            Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
+            time.clear();
+            time.set(Calendar.YEAR, 2000 + buf.readUnsignedByte());
+            time.set(Calendar.MONTH, buf.readUnsignedByte() - 1);
+            time.set(Calendar.DAY_OF_MONTH, buf.readUnsignedByte());
+            time.set(Calendar.HOUR, buf.readUnsignedByte());
+            time.set(Calendar.MINUTE, buf.readUnsignedByte());
+            time.set(Calendar.SECOND, buf.readUnsignedByte());
+            position.setTime(time.getTime());
+            
+            // Latitude
+            double latitude = buf.readUnsignedInt() / (60.0 * 30000.0);
+            
+            // Longitude
+            double longitude = buf.readUnsignedInt() / (60.0 * 30000.0);
+            
+            // Speed
+            position.setSpeed((double) buf.readUnsignedByte());
+            
+            // Speed
+            position.setCourse((double) buf.readUnsignedShort());
+            
+            buf.skipBytes(3); // reserved
+            
+            // Flags
+            long flags = buf.readUnsignedInt();
+            position.setValid((flags & 0x1) == 0x1);
+            if ((flags & 0x2) == 0) latitude = -latitude;
+            if ((flags & 0x4) == 0) longitude = -longitude;
+            
+            position.setLatitude(latitude);
+            position.setLongitude(longitude);
+            position.setAltitude(0.0);
+
+            return position;
+        }
+
+        return null;
+    }
+
+}
-- 
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