1 files changed, 123 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/NyitechProtocolDecoder.java b/src/main/java/org/traccar/protocol/NyitechProtocolDecoder.java
new file mode 100644
index 000000000..e145205f7
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/NyitechProtocolDecoder.java
@@ -0,0 +1,123 @@
+/*
+ * 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.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.DeviceSession;
+import org.traccar.Protocol;
+import org.traccar.helper.BitUtil;
+import org.traccar.helper.DateBuilder;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+import java.nio.charset.StandardCharsets;
+
+public class NyitechProtocolDecoder extends BaseProtocolDecoder {
+
+    public NyitechProtocolDecoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    public static final short MSG_LOGIN = 0x1001;
+    public static final short MSG_COMPREHENSIVE_LIVE = 0x2001;
+    public static final short MSG_COMPREHENSIVE_HISTORY = 0x2002;
+    public static final short MSG_ALARM = 0x2003;
+    public static final short MSG_FIXED = 0x2004;
+
+    private void decodeLocation(Position position, ByteBuf buf) {
+
+        DateBuilder dateBuilder = new DateBuilder()
+                .setDateReverse(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
+                .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
+        position.setTime(dateBuilder.getDate());
+
+        int flags = buf.readUnsignedByte();
+        position.setValid(BitUtil.to(flags, 2) > 0);
+
+        double lat = buf.readUnsignedIntLE() / 3600000.0;
+        double lon = buf.readUnsignedIntLE() / 3600000.0;
+
+        position.setLatitude(BitUtil.check(flags, 2) ? lat : -lat);
+        position.setLongitude(BitUtil.check(flags, 3) ? lon : -lon);
+
+        position.setSpeed(UnitsConverter.knotsFromCps(buf.readUnsignedShortLE()));
+        position.setCourse(buf.readUnsignedShortLE() * 0.1);
+        position.setAltitude(buf.readShortLE() * 0.1);
+    }
+
+    private String decodeAlarm(int type) {
+        switch (type) {
+            case 0x09:
+                return Position.ALARM_ACCELERATION;
+            case 0x0a:
+                return Position.ALARM_BRAKING;
+            case 0x0b:
+                return Position.ALARM_CORNERING;
+            case 0x0e:
+                return Position.ALARM_SOS;
+            default:
+                return null;
+        }
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ByteBuf buf = (ByteBuf) msg;
+
+        buf.skipBytes(2); // header
+        buf.readUnsignedShortLE(); // length
+
+        String id = buf.readCharSequence(12, StandardCharsets.US_ASCII).toString();
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
+        if (deviceSession == null) {
+            return null;
+        }
+
+        int type = buf.readUnsignedShortLE();
+
+        if (type != MSG_LOGIN && type != MSG_COMPREHENSIVE_LIVE
+                && type != MSG_COMPREHENSIVE_HISTORY && type != MSG_ALARM && type != MSG_FIXED) {
+            return null;
+        }
+
+        Position position = new Position(getProtocolName());
+        position.setDeviceId(deviceSession.getDeviceId());
+
+        if (type == MSG_COMPREHENSIVE_LIVE || type == MSG_COMPREHENSIVE_HISTORY) {
+            buf.skipBytes(6); // time
+            buf.skipBytes(3); // data
+        } else if (type == MSG_ALARM) {
+            buf.readUnsignedShortLE(); // random number
+            buf.readUnsignedByte(); // tag
+            position.set(Position.KEY_ALARM, decodeAlarm(buf.readUnsignedByte()));
+            buf.readUnsignedShortLE(); // threshold
+            buf.readUnsignedShortLE(); // value
+            buf.skipBytes(6); // time
+        } else if (type == MSG_FIXED) {
+            buf.skipBytes(6); // time
+        }
+
+        decodeLocation(position, buf);
+
+        return position;
+    }
+
+}