1 files changed, 105 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/Vt200ProtocolDecoder.java b/src/org/traccar/protocol/Vt200ProtocolDecoder.java
new file mode 100644
index 000000000..b9af11b43
--- /dev/null
+++ b/src/org/traccar/protocol/Vt200ProtocolDecoder.java
@@ -0,0 +1,105 @@
+/*
+ * Copyright 2017 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.
+ * 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 org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.jboss.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.DeviceSession;
+import org.traccar.helper.BcdUtil;
+import org.traccar.helper.BitUtil;
+import org.traccar.helper.DateBuilder;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+
+public class Vt200ProtocolDecoder extends BaseProtocolDecoder {
+
+    public Vt200ProtocolDecoder(Vt200Protocol protocol) {
+        super(protocol);
+    }
+
+    private static double decodeCoordinate(int value) {
+        int degrees = value / 1000000;
+        int minutes = value % 1000000;
+        return degrees + minutes * 0.0001 / 60;
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ChannelBuffer buf = (ChannelBuffer) msg;
+
+        buf.skipBytes(1); // header
+
+        String id = ChannelBuffers.hexDump(buf.readBytes(6));
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
+        if (deviceSession == null) {
+            return null;
+        }
+
+        int type = buf.readUnsignedShort();
+        buf.readUnsignedShort(); // length
+
+        if (type == 0x2084) {
+
+            Position position = new Position();
+            position.setProtocol(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            buf.readUnsignedByte(); // data type
+            buf.readUnsignedShort(); // trip id
+
+            DateBuilder dateBuilder = new DateBuilder();
+            dateBuilder.setDateReverse(
+                    BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2));
+            dateBuilder.setTime(
+                    BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2));
+            position.setTime(dateBuilder.getDate());
+
+            position.setLatitude(decodeCoordinate(BcdUtil.readInteger(buf, 8)));
+            position.setLongitude(decodeCoordinate(BcdUtil.readInteger(buf, 9)));
+
+            int flags = buf.readUnsignedByte();
+            position.setValid(BitUtil.check(flags, 0));
+            if (!BitUtil.check(flags, 1)) {
+                position.setLatitude(-position.getLatitude());
+            }
+            if (!BitUtil.check(flags, 1)) {
+                position.setLongitude(-position.getLongitude());
+            }
+
+            position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
+            position.setCourse(buf.readUnsignedByte() * 2);
+
+            position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
+            position.set(Position.KEY_RSSI, buf.readUnsignedByte());
+            position.set(Position.KEY_ODOMETER, buf.readUnsignedInt() * 1000);
+            position.set(Position.KEY_STATUS, buf.readUnsignedInt());
+
+            // additional data
+
+            return position;
+
+        }
+
+        return null;
+    }
+
+}