From fb60f434eccef5e4d0f9e3e9eca75ca73d01d2bd Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sun, 31 Oct 2021 15:44:55 -0700
Subject: Support Teltonika Dualcam protocol

---
 .../traccar/protocol/DualcamProtocolDecoder.java   | 124 +++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 src/main/java/org/traccar/protocol/DualcamProtocolDecoder.java

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

diff --git a/src/main/java/org/traccar/protocol/DualcamProtocolDecoder.java b/src/main/java/org/traccar/protocol/DualcamProtocolDecoder.java
new file mode 100644
index 000000000..4647e287c
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/DualcamProtocolDecoder.java
@@ -0,0 +1,124 @@
+/*
+ * Copyright 2021 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 io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.Context;
+import org.traccar.DeviceSession;
+import org.traccar.NetworkMessage;
+import org.traccar.Protocol;
+import org.traccar.helper.BitUtil;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+import java.nio.charset.StandardCharsets;
+
+public class DualcamProtocolDecoder extends BaseProtocolDecoder {
+
+    public DualcamProtocolDecoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    public static final int MSG_INIT = 0;
+    public static final int MSG_START = 1;
+    public static final int MSG_RESUME = 2;
+    public static final int MSG_SYNC = 3;
+    public static final int MSG_DATA = 4;
+    public static final int MSG_COMPLETE = 5;
+    public static final int MSG_FILE_REQUEST = 8;
+    public static final int MSG_INIT_REQUEST = 9;
+
+    private String uniqueId;
+    private int packetCount;
+    private int currentPacket;
+    private ByteBuf photo;
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ByteBuf buf = (ByteBuf) msg;
+
+        int type = buf.readUnsignedShort();
+
+        switch (type) {
+            case MSG_INIT:
+                buf.readUnsignedShort(); // protocol id
+                uniqueId = String.valueOf(buf.readLong());
+                DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, uniqueId);
+                long settings = buf.readUnsignedInt();
+                if (channel != null && deviceSession != null) {
+                    if (BitUtil.check(settings, 26)) {
+                        ByteBuf response = Unpooled.buffer();
+                        response.writeShort(MSG_FILE_REQUEST);
+                        String file = "%photof";
+                        response.writeShort(file.length());
+                        response.writeCharSequence(file, StandardCharsets.US_ASCII);
+                        channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
+                    } else {
+                        ByteBuf response = Unpooled.buffer();
+                        response.writeShort(MSG_COMPLETE);
+                        channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
+                    }
+                }
+                break;
+            case MSG_START:
+                buf.readUnsignedShort(); // length
+                packetCount = buf.readInt();
+                currentPacket = 1;
+                photo = Unpooled.buffer();
+                if (channel != null) {
+                    ByteBuf response = Unpooled.buffer();
+                    response.writeShort(MSG_RESUME);
+                    response.writeShort(4);
+                    response.writeInt(currentPacket);
+                    channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
+                }
+                break;
+            case MSG_DATA:
+                buf.readUnsignedShort(); // length
+                photo.writeBytes(buf, buf.readableBytes());
+                if (currentPacket == packetCount) {
+                    deviceSession = getDeviceSession(channel, remoteAddress);
+                    Position position = new Position(getProtocolName());
+                    position.setDeviceId(deviceSession.getDeviceId());
+                    getLastLocation(position, null);
+                    try {
+                        position.set(Position.KEY_IMAGE, Context.getMediaManager().writeFile(uniqueId, photo, "jpg"));
+                    } finally {
+                        photo.release();
+                        photo = null;
+                    }
+                    if (channel != null) {
+                        ByteBuf response = Unpooled.buffer();
+                        response.writeShort(MSG_INIT_REQUEST);
+                        channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
+                    }
+                } else {
+                    currentPacket += 1;
+                }
+                break;
+            default:
+                break;
+        }
+
+        return null;
+    }
+
+}
-- 
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