1 files changed, 147 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/DmtProtocolDecoder.java b/src/org/traccar/protocol/DmtProtocolDecoder.java
new file mode 100644
index 000000000..4c641f397
--- /dev/null
+++ b/src/org/traccar/protocol/DmtProtocolDecoder.java
@@ -0,0 +1,147 @@
+/*
+ * 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.UnitsConverter;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+import java.nio.ByteOrder;
+import java.nio.charset.StandardCharsets;
+import java.util.Date;
+import java.util.LinkedList;
+import java.util.List;
+
+public class DmtProtocolDecoder extends BaseProtocolDecoder {
+
+    public DmtProtocolDecoder(DmtProtocol protocol) {
+        super(protocol);
+    }
+
+    public static final int MSG_HELLO = 0x00;
+    public static final int MSG_HELLO_RESPONSE = 0x01;
+    public static final int MSG_DATA_RECORD = 0x04;
+    public static final int MSG_COMMIT = 0x05;
+    public static final int MSG_COMMIT_RESPONSE = 0x06;
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ChannelBuffer buf = (ChannelBuffer) msg;
+
+        buf.skipBytes(2); // header
+
+        int type = buf.readUnsignedByte();
+
+        buf.readUnsignedShort(); // length
+
+        if (type == MSG_HELLO) {
+
+            buf.readUnsignedInt(); // device serial number
+
+            DeviceSession deviceSession = getDeviceSession(
+                    channel, remoteAddress, buf.readBytes(15).toString(StandardCharsets.US_ASCII));
+
+            if (channel != null) {
+                ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 0);
+                response.writeByte(0x02); response.writeByte(0x55); // header
+                response.writeByte(MSG_HELLO_RESPONSE);
+                response.writeShort(4 + 4);
+                response.writeInt((int) (System.currentTimeMillis() / 1000));
+                response.writeInt(deviceSession != null ? 0 : 1); // flags
+                channel.write(response);
+            }
+
+        } else if (type == MSG_COMMIT) {
+
+            if (channel != null) {
+                ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 0);
+                response.writeByte(0x02); response.writeByte(0x55); // header
+                response.writeByte(MSG_COMMIT_RESPONSE);
+                response.writeShort(1);
+                response.writeByte(1); // flags (success)
+                channel.write(response);
+            }
+
+        } else if (type == MSG_DATA_RECORD) {
+
+            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
+            if (deviceSession == null) {
+                return null;
+            }
+
+            List<Position> positions = new LinkedList<>();
+
+            while (buf.readable()) {
+
+                int recordEnd = buf.readerIndex() + buf.readUnsignedShort();
+
+                Position position = new Position();
+                position.setProtocol(getProtocolName());
+                position.setDeviceId(deviceSession.getDeviceId());
+
+                position.set(Position.KEY_INDEX, buf.readUnsignedInt());
+
+                position.setDeviceTime(new Date(1356998400000L + buf.readUnsignedInt() * 1000)); // since 1 Jan 2013
+
+                position.set(Position.KEY_EVENT, buf.readUnsignedByte());
+
+                while (buf.readerIndex() < recordEnd) {
+
+                    int fieldId = buf.readUnsignedByte();
+                    int fieldLength = buf.readUnsignedByte();
+                    int fieldEnd = buf.readerIndex() + (fieldLength == 255 ? buf.readUnsignedShort() : fieldLength);
+
+                    if (fieldId == 0) {
+
+                        position.setFixTime(new Date(1356998400000L + buf.readUnsignedInt() * 1000));
+                        position.setLatitude(buf.readInt() * 0.0000001);
+                        position.setLongitude(buf.readInt() * 0.0000001);
+                        position.setSpeed(UnitsConverter.knotsFromCps(buf.readUnsignedShort()));
+
+                        buf.readUnsignedByte(); // speed accuracy
+
+                        position.setCourse(buf.readUnsignedByte() * 2);
+
+                        position.set(Position.KEY_PDOP, buf.readUnsignedByte() * 0.1);
+
+                        position.setAccuracy(buf.readUnsignedByte());
+                        position.setValid(buf.readUnsignedByte() != 0);
+
+                    }
+
+                    buf.readerIndex(fieldEnd);
+
+                }
+
+                positions.add(position);
+
+            }
+
+            return positions;
+
+        }
+
+        return null;
+    }
+
+}