Implement Pacific Track protocol

1 files changed, 104 insertions, 0 deletions

diff --git a/src/main/java/org/traccar/protocol/PacificTrackProtocolDecoder.java b/src/main/java/org/traccar/protocol/PacificTrackProtocolDecoder.java
new file mode 100644
index 000000000..199348c54
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/PacificTrackProtocolDecoder.java
@@ -0,0 +1,104 @@
+/*
+ * 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.ByteBufUtil;
+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;
+
+public class PacificTrackProtocolDecoder extends BaseProtocolDecoder {
+
+    public PacificTrackProtocolDecoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    public static int readBitExt(ByteBuf buf) {
+        int result = 0;
+        while (buf.isReadable()) {
+            int b = buf.readUnsignedByte();
+            result <<= 7;
+            result += BitUtil.to(b, 7);
+            if (BitUtil.check(b, 7)) {
+                break;
+            }
+        }
+        return result;
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ByteBuf buf = (ByteBuf) msg;
+
+        buf.readByte(); // frame start
+        readBitExt(buf); // frame control
+        readBitExt(buf); // frame length
+
+        DeviceSession deviceSession = null;
+        Position position = new Position(getProtocolName());
+
+        while (buf.isReadable()) {
+
+            int segmentId = readBitExt(buf);
+            int segmentLength = readBitExt(buf);
+
+            switch (segmentId) {
+                case 0x01:
+                    position.set(Position.KEY_EVENT, readBitExt(buf));
+                    break;
+                case 0x10:
+                    position.setValid(BitUtil.check(buf.readUnsignedByte(), 4));
+                    int date = buf.readUnsignedByte();
+                    DateBuilder dateBuilder = new DateBuilder()
+                            .setDate(2000 + BitUtil.from(date, 4), BitUtil.to(date, 4), buf.readUnsignedByte())
+                            .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
+                    position.setTime(dateBuilder.getDate());
+                    position.setLatitude(buf.readUnsignedInt() / 1000000.0 - 90.0);
+                    position.setLongitude(buf.readUnsignedInt() / 1000000.0 - 180.0);
+                    int speedAndCourse = buf.readUnsignedMedium();
+                    position.setCourse(BitUtil.from(speedAndCourse, 12));
+                    position.setSpeed(UnitsConverter.knotsFromKph(BitUtil.to(speedAndCourse, 12)));
+                    position.set(Position.KEY_INDEX, buf.readUnsignedShort());
+                    break;
+                case 0x100:
+                    String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(1);
+                    deviceSession = getDeviceSession(channel, remoteAddress, imei);
+                    break;
+                default:
+                    buf.skipBytes(segmentLength);
+                    break;
+            }
+        }
+
+        if (deviceSession != null) {
+            position.setDeviceId(deviceSession.getDeviceId());
+            return position;
+        } else {
+            return null;
+        }
+    }
+
+}