Implement GS100 protocol

1 files changed, 133 insertions, 0 deletions

diff --git a/src/main/java/org/traccar/protocol/Gs100ProtocolDecoder.java b/src/main/java/org/traccar/protocol/Gs100ProtocolDecoder.java
new file mode 100644
index 000000000..d55773785
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/Gs100ProtocolDecoder.java
@@ -0,0 +1,133 @@
+/*
+ * 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.BcdUtil;
+import org.traccar.helper.BitUtil;
+import org.traccar.helper.DateBuilder;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+import java.nio.charset.StandardCharsets;
+import java.util.LinkedList;
+import java.util.List;
+
+public class Gs100ProtocolDecoder extends BaseProtocolDecoder {
+
+    public Gs100ProtocolDecoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ByteBuf buf = (ByteBuf) msg;
+
+        String header = buf.readCharSequence(2, StandardCharsets.US_ASCII).toString();
+
+        if (header.equals("GL")) {
+
+            buf.skipBytes(1);
+            String imei = buf.readCharSequence(buf.readUnsignedByte(), StandardCharsets.US_ASCII).toString();
+            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
+
+            if (channel != null && deviceSession != null) {
+                ByteBuf response = Unpooled.copiedBuffer("GS100", StandardCharsets.US_ASCII);
+                channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
+            }
+
+            return null;
+
+        } else {
+
+            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
+            if (deviceSession == null) {
+                return null;
+            }
+
+            List<Position> positions = new LinkedList<>();
+
+            int count = buf.readUnsignedByte();
+            for (int i = 0; i < count; i++) {
+
+                int endIndex = buf.readUnsignedByte() + buf.readerIndex();
+
+                Position position = new Position(getProtocolName());
+                position.setDeviceId(deviceSession.getDeviceId());
+
+                int status = buf.readUnsignedMedium();
+                position.set(Position.KEY_STATUS, status);
+
+                if (BitUtil.check(status, 8 + 8 + 7)) {
+
+                    DateBuilder dateBuilder = new DateBuilder()
+                            .setHour(BcdUtil.readInteger(buf, 2))
+                            .setMinute(BcdUtil.readInteger(buf, 2))
+                            .setSecond(BcdUtil.readInteger(buf, 2))
+                            .setDay(BcdUtil.readInteger(buf, 2))
+                            .setMonth(BcdUtil.readInteger(buf, 2))
+                            .setYear(BcdUtil.readInteger(buf, 2));
+                    position.setTime(dateBuilder.getDate());
+
+                    position.setValid(true);
+
+                    String coordinates = ByteBufUtil.hexDump(buf.readSlice(9));
+                    position.setLongitude(Integer.parseInt(coordinates.substring(0, 3))
+                            + Integer.parseInt(coordinates.substring(3, 9)) * 0.0001 / 60);
+                    position.setLatitude(Integer.parseInt(coordinates.substring(10, 12))
+                            + Integer.parseInt(coordinates.substring(12, 18)) * 0.0001 / 60);
+                    int flags = Integer.parseInt(coordinates.substring(9, 10), 16);
+                    if (!BitUtil.check(flags, 4)) {
+                        position.setLongitude(-position.getLongitude());
+                    }
+                    if (!BitUtil.check(flags, 3)) {
+                        position.setLatitude(-position.getLatitude());
+                    }
+
+                    String other = ByteBufUtil.hexDump(buf.readSlice(4));
+                    position.setSpeed(Integer.parseInt(other.substring(0, 5)));
+                    position.setCourse(Integer.parseInt(other.substring(5, 8)));
+
+                }
+
+                positions.add(position);
+
+                buf.readerIndex(endIndex);
+
+            }
+
+            if (channel != null) {
+                ByteBuf response = Unpooled.buffer();
+                response.writeCharSequence("GS100", StandardCharsets.US_ASCII);
+                response.writeByte(count);
+                channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
+            }
+
+            return positions.isEmpty() ? null : positions;
+
+        }
+    }
+
+}