From 36a253b19764613e03b538a2b1a48eaa6408f4d5 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Mon, 4 Jun 2018 16:36:49 +1200
Subject: Implement Wialon Retranslator protocol

---
 .../protocol/RetranslatorProtocolDecoder.java      | 119 +++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 src/org/traccar/protocol/RetranslatorProtocolDecoder.java

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

diff --git a/src/org/traccar/protocol/RetranslatorProtocolDecoder.java b/src/org/traccar/protocol/RetranslatorProtocolDecoder.java
new file mode 100644
index 000000000..756b0bcaf
--- /dev/null
+++ b/src/org/traccar/protocol/RetranslatorProtocolDecoder.java
@@ -0,0 +1,119 @@
+/*
+ * Copyright 2018 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.model.Position;
+
+import java.net.SocketAddress;
+import java.nio.ByteOrder;
+import java.nio.charset.StandardCharsets;
+import java.util.Date;
+
+public class RetranslatorProtocolDecoder extends BaseProtocolDecoder {
+
+    public RetranslatorProtocolDecoder(RetranslatorProtocol protocol) {
+        super(protocol);
+    }
+
+    private double readDouble(ChannelBuffer buf) {
+        byte[] bytes = new byte[8];
+        buf.readBytes(bytes);
+        return ChannelBuffers.wrappedBuffer(ByteOrder.LITTLE_ENDIAN, bytes).readDouble();
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        if (channel != null) {
+            channel.write(ChannelBuffers.wrappedBuffer(new byte[]{0x11}));
+        }
+
+        ChannelBuffer buf = (ChannelBuffer) msg;
+
+        buf.readUnsignedInt(); // length
+
+        int idLength = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0x00) - buf.readerIndex();
+        String id = buf.readBytes(idLength).toString(StandardCharsets.US_ASCII);
+        buf.readByte();
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
+        if (deviceSession == null) {
+            return null;
+        }
+
+        Position position = new Position(getProtocolName());
+        position.setDeviceId(deviceSession.getDeviceId());
+        position.setTime(new Date(buf.readUnsignedInt() * 1000));
+
+        buf.readUnsignedInt(); // bit flags
+
+        while (buf.readable()) {
+
+            buf.readUnsignedShort(); // block type
+            int blockEnd = buf.readInt() + buf.readerIndex();
+            buf.readUnsignedByte(); // security attribute
+            int dataType = buf.readUnsignedByte();
+
+            int nameLength = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0x00) - buf.readerIndex();
+            String name = buf.readBytes(nameLength).toString(StandardCharsets.US_ASCII);
+            buf.readByte();
+
+            if (name.equals("posinfo")) {
+                position.setValid(true);
+                position.setLongitude(readDouble(buf));
+                position.setLatitude(readDouble(buf));
+                position.setAltitude(readDouble(buf));
+                position.setSpeed(buf.readShort());
+                position.setCourse(buf.readShort());
+                position.set(Position.KEY_SATELLITES, buf.readByte());
+            } else {
+                switch (dataType) {
+                    case 1:
+                        int len = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0x00) - buf.readerIndex();
+                        position.set(name, buf.readBytes(len).toString(StandardCharsets.US_ASCII));
+                        buf.readByte();
+                        break;
+                    case 3:
+                        position.set(name, buf.readInt());
+                        break;
+                    case 4:
+                        position.set(name, readDouble(buf));
+                        break;
+                    case 5:
+                        position.set(name, buf.readLong());
+                        break;
+                    default:
+                        break;
+                }
+            }
+
+            buf.readerIndex(blockEnd);
+
+        }
+
+        if (position.getLatitude() == 0 && position.getLongitude() == 0) {
+            getLastLocation(position, position.getDeviceTime());
+        }
+
+        return position;
+    }
+
+}
-- 
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