From 9d302724115995c7cb587c581eb2d10c4a589cf3 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Fri, 25 Dec 2020 17:50:09 -0800
Subject: Add Dolphin protocol support

---
 .../traccar/protocol/DolphinProtocolDecoder.java   | 95 ++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 src/main/java/org/traccar/protocol/DolphinProtocolDecoder.java

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

diff --git a/src/main/java/org/traccar/protocol/DolphinProtocolDecoder.java b/src/main/java/org/traccar/protocol/DolphinProtocolDecoder.java
new file mode 100644
index 000000000..56d9314b2
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/DolphinProtocolDecoder.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2020 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.ByteBufUtil;
+import io.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.DeviceSession;
+import org.traccar.Protocol;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.Position;
+import org.traccar.protobuf.dolphin.Messages.DolphinMessages;
+
+import java.net.SocketAddress;
+import java.util.Date;
+import java.util.LinkedList;
+import java.util.List;
+
+public class DolphinProtocolDecoder extends BaseProtocolDecoder {
+
+    public DolphinProtocolDecoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ByteBuf buf = (ByteBuf) msg;
+
+        buf.readUnsignedShort(); // header
+        buf.readUnsignedIntLE(); // index
+        buf.readUnsignedShort(); // version
+        buf.readUnsignedShort(); // flags
+        int type = buf.readUnsignedShortLE();
+
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(buf.readLongLE()));
+        if (deviceSession == null) {
+            return null;
+        }
+
+        int length = (int) buf.readUnsignedIntLE();
+        buf.readUnsignedInt(); // reserved
+
+        if (type == DolphinMessages.MessageType.DataPack_Request.getNumber()) {
+
+            DolphinMessages.DataPackRequest message = DolphinMessages.DataPackRequest.parseFrom(
+                    ByteBufUtil.getBytes(buf, buf.readerIndex(), length, false));
+
+            List<Position> positions = new LinkedList<>();
+
+            for (int i = 0; i < message.getPointsCount(); i++) {
+
+                Position position = new Position(getProtocolName());
+                position.setDeviceId(deviceSession.getDeviceId());
+
+                DolphinMessages.DataPoint point = message.getPoints(i);
+
+                position.setValid(true);
+                position.setTime(new Date(point.getTimestamp() * 1000L));
+                position.setLatitude(point.getLatitude());
+                position.setLongitude(point.getLongitude());
+                position.setAltitude(point.getAltitude());
+                position.setSpeed(UnitsConverter.knotsFromKph(point.getSpeed()));
+                position.setCourse(point.getBearing());
+
+                position.set(Position.KEY_SATELLITES, point.getSatellites());
+                position.set(Position.KEY_HDOP, point.getHDOP());
+
+                positions.add(position);
+
+            }
+
+            return positions;
+
+        }
+
+        return null;
+    }
+
+}
-- 
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