From 19f170b8c147935c8df4044a4fa3b6456baad6c7 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Thu, 23 Dec 2021 23:00:47 -0800
Subject: Add Digital Systems DSF22 protocol

---
 .../org/traccar/protocol/Dsf22ProtocolDecoder.java | 90 ++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 src/main/java/org/traccar/protocol/Dsf22ProtocolDecoder.java

(limited to 'src/main/java/org/traccar/protocol/Dsf22ProtocolDecoder.java')

diff --git a/src/main/java/org/traccar/protocol/Dsf22ProtocolDecoder.java b/src/main/java/org/traccar/protocol/Dsf22ProtocolDecoder.java
new file mode 100644
index 000000000..d5a9df7bc
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/Dsf22ProtocolDecoder.java
@@ -0,0 +1,90 @@
+/*
+ * 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.ByteBufUtil;
+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.util.Date;
+import java.util.LinkedList;
+import java.util.List;
+
+public class Dsf22ProtocolDecoder extends BaseProtocolDecoder {
+
+    public Dsf22ProtocolDecoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ByteBuf buf = (ByteBuf) msg;
+
+        buf.skipBytes(2); // header
+
+        String id = ByteBufUtil.hexDump(buf.readSlice(2));
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
+        if (deviceSession == null) {
+            return null;
+        }
+
+        List<Position> positions = new LinkedList<>();
+        int count = buf.readUnsignedByte();
+
+        for (int i = 0; i < count; i++) {
+
+            Position position = new Position(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            position.setValid(true);
+            position.setLatitude(buf.readInt());
+            position.setLongitude(buf.readInt());
+            position.setTime(new Date(946684800000L + buf.readUnsignedInt()));
+            position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
+
+            position.set(Position.KEY_FUEL_LEVEL, buf.readUnsignedShort() * 0.001);
+
+            int status = buf.readUnsignedByte();
+            position.set(Position.KEY_IGNITION, BitUtil.check(status, 0));
+            position.set(Position.PREFIX_IN + 1, BitUtil.check(status, 1));
+            position.set(Position.PREFIX_OUT + 1, BitUtil.check(status, 4));
+            position.set(Position.KEY_ALARM, BitUtil.check(status, 6) ? Position.ALARM_JAMMING : null);
+            position.set(Position.KEY_STATUS, status);
+
+            positions.add(position);
+
+        }
+
+        if (channel != null) {
+            byte[] response = {0x01};
+            channel.writeAndFlush(new NetworkMessage(Unpooled.wrappedBuffer(response), remoteAddress));
+        }
+
+        return positions;
+    }
+
+}
-- 
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