From b5e9d84cfeb8d4e6a4e1133a2e0510652be1de6b Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sat, 3 Aug 2019 23:16:11 -0700
Subject: Implement Naviset protocol

---
 .../traccar/protocol/NavisetProtocolDecoder.java   | 94 ++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 src/main/java/org/traccar/protocol/NavisetProtocolDecoder.java

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

diff --git a/src/main/java/org/traccar/protocol/NavisetProtocolDecoder.java b/src/main/java/org/traccar/protocol/NavisetProtocolDecoder.java
new file mode 100644
index 000000000..36a060176
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/NavisetProtocolDecoder.java
@@ -0,0 +1,94 @@
+/*
+ * Copyright 2019 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.DeviceSession;
+import org.traccar.NetworkMessage;
+import org.traccar.Protocol;
+import org.traccar.helper.BitUtil;
+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 NavisetProtocolDecoder extends BaseProtocolDecoder {
+
+    public NavisetProtocolDecoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    public static final int MSG_HEADER = 0b00;
+    public static final int MSG_DATA = 0b01;
+    public static final int MSG_RESPONSE = 0b10;
+    public static final int MSG_RESERVE = 0b11;
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ByteBuf buf = (ByteBuf) msg;
+
+        if (channel != null) {
+            ByteBuf response = Unpooled.buffer();
+            response.writeByte(0x01);
+            response.writeShortLE(buf.getUnsignedShortLE(buf.writerIndex() - 2));
+            channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
+        }
+
+        int length = buf.readUnsignedShortLE();
+        BitUtil.between(length, 12, 14); // version
+        int type = BitUtil.between(length, 14, 16);
+        buf.readUnsignedShortLE(); // device number
+
+        if (type == MSG_HEADER) {
+
+            getDeviceSession(channel, remoteAddress, buf.readCharSequence(15, StandardCharsets.US_ASCII).toString());
+
+        } else if (type == MSG_DATA) {
+
+            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
+            if (deviceSession == null) {
+                return null;
+            }
+
+            Position position = new Position(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            buf.readUnsignedByte(); // mask
+            position.set(Position.KEY_INDEX, buf.readUnsignedShortLE());
+            position.set(Position.KEY_STATUS, buf.readUnsignedByte());
+
+            position.setValid(true);
+            position.setTime(new Date(buf.readUnsignedIntLE() * 1000));
+            position.setLatitude(buf.readUnsignedIntLE() * 0.000001);
+            position.setLongitude(buf.readUnsignedIntLE() * 0.000001);
+            position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShortLE() * 0.1));
+
+            // additional data
+
+            return position;
+        }
+
+        return null;
+    }
+
+}
-- 
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