1 files changed, 239 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/GranitProtocolDecoder.java b/src/main/java/org/traccar/protocol/GranitProtocolDecoder.java
new file mode 100644
index 000000000..8900e5b39
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/GranitProtocolDecoder.java
@@ -0,0 +1,239 @@
+/*
+ * Copyright 2016 - 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.Context;
+import org.traccar.DeviceSession;
+import org.traccar.NetworkMessage;
+import org.traccar.Protocol;
+import org.traccar.helper.BitUtil;
+import org.traccar.helper.Checksum;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+
+public class GranitProtocolDecoder extends BaseProtocolDecoder {
+
+    private static final int HEADER_LENGTH = 6;
+
+    private double adc1Ratio;
+    private double adc2Ratio;
+    private double adc3Ratio;
+    private double adc4Ratio;
+
+    public GranitProtocolDecoder(Protocol protocol) {
+        super(protocol);
+        adc1Ratio = Context.getConfig().getDouble("granit.adc1Ratio", 1);
+        adc2Ratio = Context.getConfig().getDouble("granit.adc2Ratio", 1);
+        adc3Ratio = Context.getConfig().getDouble("granit.adc3Ratio", 1);
+        adc4Ratio = Context.getConfig().getDouble("granit.adc4Ratio", 1);
+    }
+
+    public static void appendChecksum(ByteBuf buffer, int length) {
+        buffer.writeByte('*');
+        int checksum = Checksum.xor(buffer.nioBuffer(0, length)) & 0xFF;
+        String checksumString = String.format("%02X", checksum);
+        buffer.writeBytes(checksumString.getBytes(StandardCharsets.US_ASCII));
+        buffer.writeByte('\r'); buffer.writeByte('\n');
+    }
+
+    private static void sendResponseCurrent(Channel channel, int deviceId, long time) {
+        ByteBuf response = Unpooled.buffer();
+        response.writeBytes("BB+UGRC~".getBytes(StandardCharsets.US_ASCII));
+        response.writeShortLE(6); // length
+        response.writeInt((int) time);
+        response.writeShortLE(deviceId);
+        appendChecksum(response, 16);
+        channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
+    }
+
+    private static void sendResponseArchive(Channel channel, int deviceId, int packNum) {
+        ByteBuf response = Unpooled.buffer();
+        response.writeBytes("BB+ARCF~".getBytes(StandardCharsets.US_ASCII));
+        response.writeShortLE(4); // length
+        response.writeShortLE(packNum);
+        response.writeShortLE(deviceId);
+        appendChecksum(response, 14);
+        channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
+    }
+
+    private void decodeStructure(ByteBuf buf, Position position) {
+        short flags = buf.readUnsignedByte();
+        position.setValid(BitUtil.check(flags, 7));
+        if (BitUtil.check(flags, 1)) {
+            position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
+        }
+
+        short satDel = buf.readUnsignedByte();
+        position.set(Position.KEY_SATELLITES, BitUtil.from(satDel, 4));
+
+        int pdop = BitUtil.to(satDel, 4);
+        position.set(Position.KEY_PDOP, pdop);
+
+        int lonDegrees = buf.readUnsignedByte();
+        int latDegrees = buf.readUnsignedByte();
+        int lonMinutes = buf.readUnsignedShortLE();
+        int latMinutes = buf.readUnsignedShortLE();
+
+        double latitude = latDegrees + latMinutes / 60000.0;
+        double longitude = lonDegrees + lonMinutes / 60000.0;
+
+        if (position.getValid()) {
+            if (!BitUtil.check(flags, 4)) {
+                latitude = -latitude;
+            }
+            if (!BitUtil.check(flags, 5)) {
+                longitude = -longitude;
+            }
+        }
+
+        position.setLongitude(longitude);
+        position.setLatitude(latitude);
+
+        position.setSpeed(buf.readUnsignedByte());
+
+        int course = buf.readUnsignedByte();
+        if (BitUtil.check(flags, 6)) {
+            course = course | 0x100;
+        }
+        position.setCourse(course);
+
+        position.set(Position.KEY_DISTANCE, buf.readShortLE());
+
+        int analogIn1 = buf.readUnsignedByte();
+        int analogIn2 = buf.readUnsignedByte();
+        int analogIn3 = buf.readUnsignedByte();
+        int analogIn4 = buf.readUnsignedByte();
+
+        int analogInHi = buf.readUnsignedByte();
+
+        analogIn1 = analogInHi << 8 & 0x300 | analogIn1;
+        analogIn2 = analogInHi << 6 & 0x300 | analogIn2;
+        analogIn3 = analogInHi << 4 & 0x300 | analogIn3;
+        analogIn4 = analogInHi << 2 & 0x300 | analogIn4;
+
+        position.set(Position.PREFIX_ADC + 1, analogIn1 * adc1Ratio);
+        position.set(Position.PREFIX_ADC + 2, analogIn2 * adc2Ratio);
+        position.set(Position.PREFIX_ADC + 3, analogIn3 * adc3Ratio);
+        position.set(Position.PREFIX_ADC + 4, analogIn4 * adc4Ratio);
+
+        position.setAltitude(buf.readUnsignedByte() * 10);
+
+        int output = buf.readUnsignedByte();
+        for (int i = 0; i < 8; i++) {
+            position.set(Position.PREFIX_IO + (i + 1), BitUtil.check(output, i));
+        }
+        buf.readUnsignedByte(); // status message buffer
+    }
+
+    @Override
+    protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ByteBuf buf = (ByteBuf) msg;
+
+        int indexTilde = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '~');
+
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
+
+        if (deviceSession != null && indexTilde == -1) {
+            String bufString = buf.toString(StandardCharsets.US_ASCII);
+            Position position = new Position(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            position.setTime(new Date());
+            getLastLocation(position, new Date());
+            position.setValid(false);
+            position.set(Position.KEY_RESULT, bufString);
+            return position;
+        }
+
+        if (buf.readableBytes() < HEADER_LENGTH) {
+            return null;
+        }
+        String header = buf.readSlice(HEADER_LENGTH).toString(StandardCharsets.US_ASCII);
+
+        if (header.equals("+RRCB~")) {
+
+            buf.skipBytes(2); // binary length 26
+            int deviceId = buf.readUnsignedShortLE();
+            deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(deviceId));
+            if (deviceSession == null) {
+                return null;
+            }
+            long unixTime = buf.readUnsignedIntLE();
+            if (channel != null) {
+                sendResponseCurrent(channel, deviceId, unixTime);
+            }
+            Position position = new Position(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            position.setTime(new Date(unixTime * 1000));
+
+            decodeStructure(buf, position);
+            return position;
+
+        } else if (header.equals("+DDAT~")) {
+
+            buf.skipBytes(2); // binary length
+            int deviceId = buf.readUnsignedShortLE();
+            deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(deviceId));
+            if (deviceSession == null) {
+                return null;
+            }
+            byte format = buf.readByte();
+            if (format != 4) {
+                return null;
+            }
+            byte nblocks = buf.readByte();
+            int packNum = buf.readUnsignedShortLE();
+            if (channel != null) {
+                sendResponseArchive(channel, deviceId, packNum);
+            }
+            List<Position> positions = new ArrayList<>();
+            while (nblocks > 0) {
+                nblocks--;
+                long unixTime = buf.readUnsignedIntLE();
+                int timeIncrement = buf.getUnsignedShortLE(buf.readerIndex() + 120);
+                for (int i = 0; i < 6; i++) {
+                    if (buf.getUnsignedByte(buf.readerIndex()) != 0xFE) {
+                        Position position = new Position(getProtocolName());
+                        position.setDeviceId(deviceSession.getDeviceId());
+                        position.setTime(new Date((unixTime + i * timeIncrement) * 1000));
+                        decodeStructure(buf, position);
+                        position.set(Position.KEY_ARCHIVE, true);
+                        positions.add(position);
+                    } else {
+                        buf.skipBytes(20); // skip filled 0xFE structure
+                    }
+                }
+                buf.skipBytes(2); // increment
+            }
+            return positions;
+
+        }
+
+        return null;
+    }
+
+}