1 files changed, 133 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/GatorProtocolDecoder.java b/src/main/java/org/traccar/protocol/GatorProtocolDecoder.java
new file mode 100644
index 000000000..31500bae6
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/GatorProtocolDecoder.java
@@ -0,0 +1,133 @@
+/*
+ * Copyright 2013 - 2018 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.BcdUtil;
+import org.traccar.helper.DateBuilder;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+
+public class GatorProtocolDecoder extends BaseProtocolDecoder {
+
+    public GatorProtocolDecoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    public static final int MSG_HEARTBEAT = 0x21;
+    public static final int MSG_POSITION_DATA = 0x80;
+    public static final int MSG_ROLLCALL_RESPONSE = 0x81;
+    public static final int MSG_ALARM_DATA = 0x82;
+    public static final int MSG_TERMINAL_STATUS = 0x83;
+    public static final int MSG_MESSAGE = 0x84;
+    public static final int MSG_TERMINAL_ANSWER = 0x85;
+    public static final int MSG_BLIND_AREA = 0x8E;
+    public static final int MSG_PICTURE_FRAME = 0x54;
+    public static final int MSG_CAMERA_RESPONSE = 0x56;
+    public static final int MSG_PICTURE_DATA = 0x57;
+
+    public static String decodeId(int b1, int b2, int b3, int b4) {
+
+        int d1 = 30 + ((b1 >> 7) << 3) + ((b2 >> 7) << 2) + ((b3 >> 7) << 1) + (b4 >> 7);
+        int d2 = b1 & 0x7f;
+        int d3 = b2 & 0x7f;
+        int d4 = b3 & 0x7f;
+        int d5 = b4 & 0x7f;
+
+        return String.format("%02d%02d%02d%02d%02d", d1, d2, d3, d4, d5);
+    }
+
+    private void sendResponse(Channel channel, SocketAddress remoteAddress, byte calibration) {
+        if (channel != null) {
+            ByteBuf response = Unpooled.buffer();
+            response.writeByte(0x24); response.writeByte(0x24); // header
+            response.writeByte(MSG_HEARTBEAT); // size
+            response.writeShort(5);
+            response.writeByte(calibration);
+            response.writeByte(0); // main order
+            response.writeByte(0); // slave order
+            response.writeByte(1); // calibration
+            response.writeByte(0x0D);
+            channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
+        }
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ByteBuf buf = (ByteBuf) msg;
+
+        buf.skipBytes(2); // header
+        int type = buf.readUnsignedByte();
+        buf.readUnsignedShort(); // length
+
+        String id = decodeId(
+                buf.readUnsignedByte(), buf.readUnsignedByte(),
+                buf.readUnsignedByte(), buf.readUnsignedByte());
+
+        sendResponse(channel, remoteAddress, buf.getByte(buf.writerIndex() - 2));
+
+        if (type == MSG_POSITION_DATA || type == MSG_ROLLCALL_RESPONSE
+                || type == MSG_ALARM_DATA || type == MSG_BLIND_AREA) {
+
+            Position position = new Position(getProtocolName());
+
+            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, "1" + id, id);
+            if (deviceSession == null) {
+                return null;
+            }
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            DateBuilder dateBuilder = new DateBuilder()
+                    .setYear(BcdUtil.readInteger(buf, 2))
+                    .setMonth(BcdUtil.readInteger(buf, 2))
+                    .setDay(BcdUtil.readInteger(buf, 2))
+                    .setHour(BcdUtil.readInteger(buf, 2))
+                    .setMinute(BcdUtil.readInteger(buf, 2))
+                    .setSecond(BcdUtil.readInteger(buf, 2));
+            position.setTime(dateBuilder.getDate());
+
+            position.setLatitude(BcdUtil.readCoordinate(buf));
+            position.setLongitude(BcdUtil.readCoordinate(buf));
+            position.setSpeed(UnitsConverter.knotsFromKph(BcdUtil.readInteger(buf, 4)));
+            position.setCourse(BcdUtil.readInteger(buf, 4));
+
+            int flags = buf.readUnsignedByte();
+            position.setValid((flags & 0x80) != 0);
+            position.set(Position.KEY_SATELLITES, flags & 0x0f);
+
+            position.set(Position.KEY_STATUS, buf.readUnsignedByte());
+            position.set("key", buf.readUnsignedByte());
+            position.set("oil", buf.readUnsignedShort() / 10.0);
+            position.set(Position.KEY_POWER, buf.readUnsignedByte() + buf.readUnsignedByte() * 0.01);
+            position.set(Position.KEY_ODOMETER, buf.readUnsignedInt());
+
+            return position;
+        }
+
+        return null;
+    }
+
+}