From 237c80296fe947c6857c9509ba1b947ed02b354f Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Wed, 2 Aug 2017 07:52:33 +1200
Subject: Implement TLV communication protocol

---
 src/org/traccar/protocol/TlvProtocolDecoder.java | 109 +++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 src/org/traccar/protocol/TlvProtocolDecoder.java

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

diff --git a/src/org/traccar/protocol/TlvProtocolDecoder.java b/src/org/traccar/protocol/TlvProtocolDecoder.java
new file mode 100644
index 000000000..41d65be09
--- /dev/null
+++ b/src/org/traccar/protocol/TlvProtocolDecoder.java
@@ -0,0 +1,109 @@
+/*
+ * 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.charset.StandardCharsets;
+import java.util.Date;
+
+public class TlvProtocolDecoder extends BaseProtocolDecoder {
+
+    public TlvProtocolDecoder(TlvProtocol protocol) {
+        super(protocol);
+    }
+
+    private void sendResponse(Channel channel, String type, String... arguments) {
+        if (channel != null) {
+            ChannelBuffer response = ChannelBuffers.dynamicBuffer();
+            response.writeBytes(ChannelBuffers.copiedBuffer(type, StandardCharsets.US_ASCII));
+            for (String argument : arguments) {
+                response.writeByte(argument.length());
+                response.writeBytes(ChannelBuffers.copiedBuffer(argument, StandardCharsets.US_ASCII));
+            }
+            response.writeByte(0);
+            channel.write(response);
+        }
+    }
+
+    private String readArgument(ChannelBuffer buf) {
+        return buf.readBytes(buf.readUnsignedByte()).toString(StandardCharsets.US_ASCII);
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ChannelBuffer buf = (ChannelBuffer) msg;
+
+        String type = buf.readBytes(2).toString(StandardCharsets.US_ASCII);
+
+        if (channel != null) {
+            switch (type) {
+                case "0A":
+                case "0C":
+                    sendResponse(channel, type);
+                    break;
+                case "0B":
+                    sendResponse(channel, type, "1482202689", "10", "20", "15");
+                    break;
+                case "0E":
+                case "0F":
+                    sendResponse(channel, type, "30", "Unknown");
+                    break;
+                default:
+                    break;
+            }
+        }
+
+        if (type.equals("0E")) {
+
+            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, readArgument(buf));
+            if (deviceSession == null) {
+                return null;
+            }
+
+            Position position = new Position();
+            position.setProtocol(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            position.setValid(true);
+            position.setTime(new Date(Long.parseLong(readArgument(buf)) * 1000));
+
+            readArgument(buf); // location identifier
+
+            position.setLongitude(Double.parseDouble(readArgument(buf)));
+            position.setLatitude(Double.parseDouble(readArgument(buf)));
+            position.setSpeed(UnitsConverter.knotsFromKph(Double.parseDouble(readArgument(buf))));
+            position.setCourse(Double.parseDouble(readArgument(buf)));
+
+            position.set(Position.KEY_SATELLITES, Integer.parseInt(readArgument(buf)));
+
+            return position;
+
+        }
+
+        return null;
+    }
+
+}
-- 
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