Example usage for io.netty.buffer ByteBuf readSlice

List of usage examples for io.netty.buffer ByteBuf readSlice

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Introduction

In this page you can find the example usage for io.netty.buffer ByteBuf readSlice.

Prototype

public abstract ByteBuf readSlice(int length);

Source Link

Document

Returns a new slice of this buffer's sub-region starting at the current readerIndex and increases the readerIndex by the size of the new slice (= length ).

Usage

From source file:org.traccar.protocol.AplicomProtocolDecoder.java

License:Apache License

private void decodeE(Position position, ByteBuf buf, int selector) {

    if ((selector & 0x0008) != 0) {
        position.set("tachographEvent", buf.readUnsignedShort());
    }//  w  w w.  j av  a2s . c  om

    if ((selector & 0x0004) != 0) {
        getLastLocation(position, new Date(buf.readUnsignedInt() * 1000));
    } else {
        getLastLocation(position, null);
    }

    if ((selector & 0x0010) != 0) {
        String time = buf.readUnsignedByte() + "s " + buf.readUnsignedByte() + "m " + buf.readUnsignedByte()
                + "h " + buf.readUnsignedByte() + "M " + buf.readUnsignedByte() + "D " + buf.readUnsignedByte()
                + "Y " + buf.readByte() + "m " + buf.readByte() + "h";
        position.set("tachographTime", time);
    }

    position.set("workState", buf.readUnsignedByte());
    position.set("driver1State", buf.readUnsignedByte());
    position.set("driver2State", buf.readUnsignedByte());

    if ((selector & 0x0020) != 0) {
        position.set("tachographStatus", buf.readUnsignedByte());
    }

    if ((selector & 0x0040) != 0) {
        position.set(Position.KEY_OBD_SPEED, buf.readUnsignedShort() / 256.0);
    }

    if ((selector & 0x0080) != 0) {
        position.set(Position.KEY_OBD_ODOMETER, buf.readUnsignedInt() * 5);
    }

    if ((selector & 0x0100) != 0) {
        position.set(Position.KEY_ODOMETER_TRIP, buf.readUnsignedInt() * 5);
    }

    if ((selector & 0x8000) != 0) {
        position.set("kFactor", buf.readUnsignedShort() * 0.001 + " pulses/m");
    }

    if ((selector & 0x0200) != 0) {
        position.set(Position.KEY_RPM, buf.readUnsignedShort() * 0.125);
    }

    if ((selector & 0x0400) != 0) {
        position.set("extraInfo", buf.readUnsignedShort());
    }

    if ((selector & 0x0800) != 0) {
        position.set(Position.KEY_VIN, buf.readSlice(18).toString(StandardCharsets.US_ASCII).trim());
    }

    if ((selector & 0x2000) != 0) {
        buf.readUnsignedByte(); // card 1 type
        buf.readUnsignedByte(); // card 1 country code
        String card = buf.readSlice(20).toString(StandardCharsets.US_ASCII).trim();
        if (!card.isEmpty()) {
            position.set("card1", card);
        }
    }

    if ((selector & 0x4000) != 0) {
        buf.readUnsignedByte(); // card 2 type
        buf.readUnsignedByte(); // card 2 country code
        String card = buf.readSlice(20).toString(StandardCharsets.US_ASCII).trim();
        if (!card.isEmpty()) {
            position.set("card2", card);
        }
    }

    if ((selector & 0x10000) != 0) {
        int count = buf.readUnsignedByte();
        for (int i = 1; i <= count; i++) {
            position.set("driver" + i, buf.readSlice(22).toString(StandardCharsets.US_ASCII).trim());
            position.set("driverTime" + i, buf.readUnsignedInt());
        }
    }
}

From source file:org.traccar.protocol.AplicomProtocolDecoder.java

License:Apache License

private void decodeEB(Position position, ByteBuf buf) {

    if (buf.readByte() != (byte) 'E' || buf.readByte() != (byte) 'B') {
        return;// ww  w. ja  v a  2 s.c  o  m
    }

    position.set(Position.KEY_VERSION_FW, buf.readUnsignedByte());
    position.set(Position.KEY_EVENT, buf.readUnsignedShort());
    position.set("dataValidity", buf.readUnsignedByte());
    position.set("towed", buf.readUnsignedByte());
    buf.readUnsignedShort(); // length

    while (buf.readableBytes() > 0) {
        buf.readUnsignedByte(); // towed position
        int type = buf.readUnsignedByte();
        int length = buf.readUnsignedByte();
        int end = buf.readerIndex() + length;

        switch (type) {
        case 0x01:
            position.set("brakeFlags", ByteBufUtil.hexDump(buf.readSlice(length)));
            break;
        case 0x02:
            position.set("wheelSpeed", buf.readUnsignedShort() / 256.0);
            position.set("wheelSpeedDifference", buf.readUnsignedShort() / 256.0 - 125.0);
            position.set("lateralAcceleration", buf.readUnsignedByte() / 10.0 - 12.5);
            position.set("vehicleSpeed", buf.readUnsignedShort() / 256.0);
            break;
        case 0x03:
            position.set(Position.KEY_AXLE_WEIGHT, buf.readUnsignedShort() * 2);
            break;
        case 0x04:
            position.set("tyrePressure", buf.readUnsignedByte() * 10);
            position.set("pneumaticPressure", buf.readUnsignedByte() * 5);
            break;
        case 0x05:
            position.set("brakeLining", buf.readUnsignedByte() * 0.4);
            position.set("brakeTemperature", buf.readUnsignedByte() * 10);
            break;
        case 0x06:
            position.set(Position.KEY_ODOMETER, buf.readUnsignedInt() * 5L);
            position.set(Position.KEY_ODOMETER_TRIP, buf.readUnsignedInt() * 5L);
            position.set(Position.KEY_ODOMETER_SERVICE, (buf.readUnsignedInt() - 2105540607) * 5L);
            break;
        case 0x0A:
            position.set("absStatusCounter", buf.readUnsignedShort());
            position.set("atvbStatusCounter", buf.readUnsignedShort());
            position.set("vdcActiveCounter", buf.readUnsignedShort());
            break;
        case 0x0B:
            position.set("brakeMinMaxData", ByteBufUtil.hexDump(buf.readSlice(length)));
            break;
        case 0x0C:
            position.set("missingPgn", ByteBufUtil.hexDump(buf.readSlice(length)));
            break;
        case 0x0D:
            buf.readUnsignedByte();
            position.set("towedDetectionStatus", buf.readUnsignedInt());
            buf.skipBytes(17); // vin
            break;
        case 0x0E:
        default:
            break;
        }

        buf.readerIndex(end);
    }
}

From source file:org.traccar.protocol.AstraProtocolDecoder.java

License:Apache License

@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

    ByteBuf buf = (ByteBuf) msg;

    if (channel != null) {
        channel.writeAndFlush(new NetworkMessage(Unpooled.wrappedBuffer(new byte[] { 0x06 }), remoteAddress));
    }/*ww w  .  j  a v a2 s . com*/

    buf.readUnsignedByte(); // protocol
    buf.readUnsignedShort(); // length

    String imei = String.format("%08d", buf.readUnsignedInt())
            + String.format("%07d", buf.readUnsignedMedium());
    DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
    if (deviceSession == null) {
        return null;
    }

    List<Position> positions = new LinkedList<>();

    while (buf.readableBytes() > 2) {

        Position position = new Position(getProtocolName());
        position.setDeviceId(deviceSession.getDeviceId());

        buf.readUnsignedByte(); // index

        position.setValid(true);
        position.setLatitude(buf.readInt() * 0.000001);
        position.setLongitude(buf.readInt() * 0.000001);

        DateBuilder dateBuilder = new DateBuilder().setDate(1980, 1, 6)
                .addMillis(buf.readUnsignedInt() * 1000L);
        position.setTime(dateBuilder.getDate());

        position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte() * 2));
        position.setCourse(buf.readUnsignedByte() * 2);

        int reason = buf.readUnsignedMedium();
        position.set(Position.KEY_EVENT, reason);

        int status = buf.readUnsignedShort();
        position.set(Position.KEY_STATUS, status);

        position.set(Position.PREFIX_IO + 1, buf.readUnsignedByte());
        position.set(Position.PREFIX_ADC + 1, buf.readUnsignedByte());
        position.set(Position.KEY_BATTERY, buf.readUnsignedByte());
        position.set(Position.KEY_POWER, buf.readUnsignedByte());

        buf.readUnsignedByte(); // max journey speed
        buf.skipBytes(6); // accelerometer
        position.set(Position.KEY_ODOMETER_TRIP, buf.readUnsignedShort());
        buf.readUnsignedShort(); // journey idle time

        position.setAltitude(buf.readUnsignedByte() * 20);

        int quality = buf.readUnsignedByte();
        position.set(Position.KEY_SATELLITES, quality & 0xf);
        position.set(Position.KEY_RSSI, quality >> 4);

        buf.readUnsignedByte(); // geofence events

        if (BitUtil.check(status, 8)) {
            position.set(Position.KEY_DRIVER_UNIQUE_ID, buf.readSlice(7).toString(StandardCharsets.US_ASCII));
            position.set(Position.KEY_ODOMETER, buf.readUnsignedMedium() * 1000);
            position.set(Position.KEY_HOURS, UnitsConverter.msFromHours(buf.readUnsignedShort()));
        }

        if (BitUtil.check(status, 6)) {
            LOGGER.warn("Extension data is not supported");
            return position;
        }

        positions.add(position);

    }

    return positions;
}

From source file:org.traccar.protocol.At2000ProtocolDecoder.java

License:Apache License

@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

    ByteBuf buf = (ByteBuf) msg;

    if (buf.getUnsignedByte(buf.readerIndex()) == 0x01) {
        buf.readUnsignedByte(); // codec id
    }//w  ww.j  a  v  a 2 s .  c o  m

    int type = buf.readUnsignedByte();
    buf.readUnsignedMediumLE(); // length
    buf.skipBytes(BLOCK_LENGTH - 1 - 3);

    if (type == MSG_DEVICE_ID) {

        String imei = buf.readSlice(15).toString(StandardCharsets.US_ASCII);
        if (getDeviceSession(channel, remoteAddress, imei) != null) {

            byte[] iv = new byte[BLOCK_LENGTH];
            buf.readBytes(iv);
            IvParameterSpec ivSpec = new IvParameterSpec(iv);

            SecretKeySpec keySpec = new SecretKeySpec(
                    DataConverter.parseHex("000102030405060708090a0b0c0d0e0f"), "AES");

            cipher = Cipher.getInstance("AES/CBC/NoPadding");
            cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);

            byte[] data = new byte[BLOCK_LENGTH];
            buf.readBytes(data);
            cipher.update(data);

        }

    } else if (type == MSG_TRACK_RESPONSE) {

        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
        if (deviceSession == null) {
            return null;
        }

        if (buf.capacity() <= BLOCK_LENGTH) {
            return null; // empty message
        }

        List<Position> positions = new LinkedList<>();

        byte[] data = new byte[buf.capacity() - BLOCK_LENGTH];
        buf.readBytes(data);
        buf = Unpooled.wrappedBuffer(cipher.update(data));
        try {
            while (buf.readableBytes() >= 63) {

                Position position = new Position(getProtocolName());
                position.setDeviceId(deviceSession.getDeviceId());

                buf.readUnsignedShortLE(); // index
                buf.readUnsignedShortLE(); // reserved

                position.setValid(true);

                position.setTime(new Date(buf.readLongLE() * 1000));

                position.setLatitude(buf.readFloatLE());
                position.setLongitude(buf.readFloatLE());
                position.setAltitude(buf.readFloatLE());
                position.setSpeed(UnitsConverter.knotsFromKph(buf.readFloatLE()));
                position.setCourse(buf.readFloatLE());

                buf.readUnsignedIntLE(); // geozone event
                buf.readUnsignedIntLE(); // io events
                buf.readUnsignedIntLE(); // geozone value
                buf.readUnsignedIntLE(); // io values
                buf.readUnsignedShortLE(); // operator

                position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShortLE());
                position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShortLE());

                position.set(Position.KEY_POWER, buf.readUnsignedShortLE() * 0.001);

                buf.readUnsignedShortLE(); // cid
                position.set(Position.KEY_RSSI, buf.readUnsignedByte());
                buf.readUnsignedByte(); // current profile

                position.set(Position.KEY_BATTERY, buf.readUnsignedByte());
                position.set(Position.PREFIX_TEMP + 1, buf.readUnsignedByte());
                position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());

                positions.add(position);

            }
        } finally {
            buf.release();
        }

        return positions;

    }

    if (type == MSG_DEVICE_ID) {
        sendRequest(channel);
    }

    return null;
}

From source file:org.traccar.protocol.AtrackProtocolDecoder.java

License:Apache License

private static String readString(ByteBuf buf) {
    String result = null;/*from w  ww .j ava 2  s .  c  o m*/
    int index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0);
    if (index > buf.readerIndex()) {
        result = buf.readSlice(index - buf.readerIndex()).toString(StandardCharsets.US_ASCII);
    }
    buf.readByte();
    return result;
}

From source file:org.traccar.protocol.AutoFonProtocolDecoder.java

License:Apache License

@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

    ByteBuf buf = (ByteBuf) msg;

    int type = buf.readUnsignedByte();

    if (type == MSG_LOGIN || type == MSG_45_LOGIN) {

        if (type == MSG_LOGIN) {
            buf.readUnsignedByte(); // hardware version
            buf.readUnsignedByte(); // software version
        }// w w w.j av  a  2s .  com

        String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(1);
        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);

        if (deviceSession != null && channel != null) {
            ByteBuf response = Unpooled.buffer();
            response.writeBytes("resp_crc=".getBytes(StandardCharsets.US_ASCII));
            response.writeByte(buf.getByte(buf.writerIndex() - 1));
            channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
        }

        return null;

    }

    DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
    if (deviceSession == null) {
        return null;
    }

    if (type == MSG_LOCATION) {

        return decodePosition(deviceSession, buf, false);

    } else if (type == MSG_HISTORY) {

        int count = buf.readUnsignedByte() & 0x0f;
        buf.readUnsignedShort(); // total count
        List<Position> positions = new LinkedList<>();

        for (int i = 0; i < count; i++) {
            positions.add(decodePosition(deviceSession, buf, true));
        }

        return positions;

    } else if (type == MSG_45_LOCATION) {

        Position position = new Position(getProtocolName());
        position.setDeviceId(deviceSession.getDeviceId());

        short status = buf.readUnsignedByte();
        if (BitUtil.check(status, 7)) {
            position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
        }
        position.set(Position.KEY_BATTERY, BitUtil.to(status, 7));

        buf.skipBytes(2); // remaining time

        position.set(Position.PREFIX_TEMP + 1, buf.readByte());

        buf.skipBytes(2); // timer (interval and units)
        buf.readByte(); // mode
        buf.readByte(); // gprs sending interval

        buf.skipBytes(6); // mcc, mnc, lac, cid

        int valid = buf.readUnsignedByte();
        position.setValid(BitUtil.from(valid, 6) != 0);
        position.set(Position.KEY_SATELLITES, BitUtil.from(valid, 6));

        int time = buf.readUnsignedMedium();
        int date = buf.readUnsignedMedium();

        DateBuilder dateBuilder = new DateBuilder().setTime(time / 10000, time / 100 % 100, time % 100)
                .setDateReverse(date / 10000, date / 100 % 100, date % 100);
        position.setTime(dateBuilder.getDate());

        position.setLatitude(convertCoordinate(buf.readUnsignedByte(), buf.readUnsignedMedium()));
        position.setLongitude(convertCoordinate(buf.readUnsignedByte(), buf.readUnsignedMedium()));
        position.setSpeed(buf.readUnsignedByte());
        position.setCourse(buf.readUnsignedShort());

        return position;

    }

    return null;
}

From source file:org.traccar.protocol.BlackKiteProtocolDecoder.java

License:Apache License

@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

    ByteBuf buf = (ByteBuf) msg;

    buf.readUnsignedByte(); // header
    int length = (buf.readUnsignedShortLE() & 0x7fff) + 3;

    List<Position> positions = new LinkedList<>();
    Set<Integer> tags = new HashSet<>();
    boolean hasLocation = false;
    Position position = new Position(getProtocolName());

    while (buf.readerIndex() < length) {

        // Check if new message started
        int tag = buf.readUnsignedByte();
        if (tags.contains(tag)) {
            if (hasLocation && position.getFixTime() != null) {
                positions.add(position);
            }/*  w  w  w .ja v  a2 s. c  om*/
            tags.clear();
            hasLocation = false;
            position = new Position(getProtocolName());
        }
        tags.add(tag);

        switch (tag) {

        case TAG_IMEI:
            getDeviceSession(channel, remoteAddress, buf.readSlice(15).toString(StandardCharsets.US_ASCII));
            break;

        case TAG_DATE:
            position.setTime(new Date(buf.readUnsignedIntLE() * 1000));
            break;

        case TAG_COORDINATES:
            hasLocation = true;
            position.setValid((buf.readUnsignedByte() & 0xf0) == 0x00);
            position.setLatitude(buf.readIntLE() / 1000000.0);
            position.setLongitude(buf.readIntLE() / 1000000.0);
            break;

        case TAG_SPEED_COURSE:
            position.setSpeed(buf.readUnsignedShortLE() * 0.0539957);
            position.setCourse(buf.readUnsignedShortLE() * 0.1);
            break;

        case TAG_ALTITUDE:
            position.setAltitude(buf.readShortLE());
            break;

        case TAG_STATUS:
            int status = buf.readUnsignedShortLE();
            position.set(Position.KEY_IGNITION, BitUtil.check(status, 9));
            if (BitUtil.check(status, 15)) {
                position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
            }
            position.set(Position.KEY_CHARGE, BitUtil.check(status, 2));
            break;

        case TAG_DIGITAL_INPUTS:
            int input = buf.readUnsignedShortLE();
            for (int i = 0; i < 16; i++) {
                position.set(Position.PREFIX_IO + (i + 1), BitUtil.check(input, i));
            }
            break;

        case TAG_DIGITAL_OUTPUTS:
            int output = buf.readUnsignedShortLE();
            for (int i = 0; i < 16; i++) {
                position.set(Position.PREFIX_IO + (i + 17), BitUtil.check(output, i));
            }
            break;

        case TAG_INPUT_VOLTAGE1:
            position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShortLE() / 1000.0);
            break;

        case TAG_INPUT_VOLTAGE2:
            position.set(Position.PREFIX_ADC + 2, buf.readUnsignedShortLE() / 1000.0);
            break;

        case TAG_INPUT_VOLTAGE3:
            position.set(Position.PREFIX_ADC + 3, buf.readUnsignedShortLE() / 1000.0);
            break;

        case TAG_INPUT_VOLTAGE4:
            position.set(Position.PREFIX_ADC + 4, buf.readUnsignedShortLE() / 1000.0);
            break;

        case TAG_XT1:
        case TAG_XT2:
        case TAG_XT3:
            buf.skipBytes(16);
            break;

        default:
            break;

        }
    }

    if (hasLocation && position.getFixTime() != null) {
        positions.add(position);
    }

    DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
    if (deviceSession == null) {
        return null;
    }

    sendReply(channel, buf.readUnsignedShortLE());

    for (Position p : positions) {
        p.setDeviceId(deviceSession.getDeviceId());
    }

    if (positions.isEmpty()) {
        return null;
    }

    return positions;
}

From source file:org.traccar.protocol.CalAmpProtocolDecoder.java

License:Apache License

@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

    ByteBuf buf = (ByteBuf) msg;

    if (BitUtil.check(buf.getByte(buf.readerIndex()), 7)) {

        int content = buf.readUnsignedByte();

        if (BitUtil.check(content, 0)) {
            String id = ByteBufUtil.hexDump(buf.readSlice(buf.readUnsignedByte()));
            getDeviceSession(channel, remoteAddress, id);
        }// www .j  a  v a  2s. c  o m

        if (BitUtil.check(content, 1)) {
            buf.skipBytes(buf.readUnsignedByte()); // identifier type
        }

        if (BitUtil.check(content, 2)) {
            buf.skipBytes(buf.readUnsignedByte()); // authentication
        }

        if (BitUtil.check(content, 3)) {
            buf.skipBytes(buf.readUnsignedByte()); // routing
        }

        if (BitUtil.check(content, 4)) {
            buf.skipBytes(buf.readUnsignedByte()); // forwarding
        }

        if (BitUtil.check(content, 5)) {
            buf.skipBytes(buf.readUnsignedByte()); // response redirection
        }

    }

    DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
    if (deviceSession == null) {
        return null;
    }

    int service = buf.readUnsignedByte();
    int type = buf.readUnsignedByte();
    int index = buf.readUnsignedShort();

    if (service == SERVICE_ACKNOWLEDGED) {
        sendResponse(channel, remoteAddress, type, index, 0);
    }

    if (type == MSG_EVENT_REPORT || type == MSG_LOCATE_REPORT || type == MSG_MINI_EVENT_REPORT) {
        return decodePosition(deviceSession, type, buf);
    }

    return null;
}

From source file:org.traccar.protocol.CastelProtocolDecoder.java

License:Apache License

private Object decodeSc(Channel channel, SocketAddress remoteAddress, ByteBuf buf, int version, ByteBuf id,
        short type, DeviceSession deviceSession) {

    if (type == MSG_SC_HEARTBEAT) {

        sendResponse(channel, remoteAddress, version, id, MSG_SC_HEARTBEAT_RESPONSE, null);

    } else if (type == MSG_SC_LOGIN || type == MSG_SC_LOGOUT || type == MSG_SC_GPS || type == MSG_SC_ALARM
            || type == MSG_SC_CURRENT_LOCATION || type == MSG_SC_FUEL) {

        if (type == MSG_SC_LOGIN) {
            ByteBuf response = Unpooled.buffer(10);
            response.writeIntLE(0xFFFFFFFF);
            response.writeShortLE(0);/*  ww w . j  a  v a 2  s .co  m*/
            response.writeIntLE((int) (System.currentTimeMillis() / 1000));
            sendResponse(channel, remoteAddress, version, id, MSG_SC_LOGIN_RESPONSE, response);
        }

        if (type == MSG_SC_GPS) {
            buf.readUnsignedByte(); // historical
        } else if (type == MSG_SC_ALARM) {
            buf.readUnsignedIntLE(); // alarm
        } else if (type == MSG_SC_CURRENT_LOCATION) {
            buf.readUnsignedShortLE();
        }

        buf.readUnsignedIntLE(); // ACC ON time
        buf.readUnsignedIntLE(); // UTC time
        long odometer = buf.readUnsignedIntLE();
        long tripOdometer = buf.readUnsignedIntLE();
        long fuelConsumption = buf.readUnsignedIntLE();
        buf.readUnsignedShortLE(); // current fuel consumption
        long status = buf.readUnsignedIntLE();
        buf.skipBytes(8);

        int count = buf.readUnsignedByte();

        List<Position> positions = new LinkedList<>();

        for (int i = 0; i < count; i++) {
            Position position = readPosition(deviceSession, buf);
            position.set(Position.KEY_ODOMETER, odometer);
            position.set(Position.KEY_ODOMETER_TRIP, tripOdometer);
            position.set(Position.KEY_FUEL_CONSUMPTION, fuelConsumption);
            position.set(Position.KEY_STATUS, status);
            positions.add(position);
        }

        if (type == MSG_SC_ALARM) {
            int alarmCount = buf.readUnsignedByte();
            for (int i = 0; i < alarmCount; i++) {
                if (buf.readUnsignedByte() != 0) {
                    int alarm = buf.readUnsignedByte();
                    for (Position position : positions) {
                        decodeAlarm(position, alarm);
                    }
                    buf.readUnsignedShortLE(); // description
                    buf.readUnsignedShortLE(); // threshold
                }
            }
        } else if (type == MSG_SC_FUEL) {
            for (Position position : positions) {
                position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShortLE());
            }
        }

        if (!positions.isEmpty()) {
            return positions;
        }

    } else if (type == MSG_SC_GPS_SLEEP) {

        buf.readUnsignedIntLE(); // device time

        return readPosition(deviceSession, buf);

    } else if (type == MSG_SC_AGPS_REQUEST) {

        return readPosition(deviceSession, buf);

    } else if (type == MSG_SC_PID_DATA) {

        Position position = createPosition(deviceSession);

        decodeStat(position, buf);

        buf.readUnsignedShortLE(); // sample rate
        decodeObd(position, buf, true);

        return position;

    } else if (type == MSG_SC_DTCS_PASSENGER) {

        Position position = createPosition(deviceSession);

        decodeStat(position, buf);

        buf.readUnsignedByte(); // flag
        position.add(ObdDecoder.decodeCodes(ByteBufUtil.hexDump(buf.readSlice(buf.readUnsignedByte()))));

        return position;

    } else if (type == MSG_SC_OBD_DATA) {

        Position position = createPosition(deviceSession);

        decodeStat(position, buf);

        buf.readUnsignedByte(); // flag
        decodeObd(position, buf, false);

        return position;

    } else if (type == MSG_SC_CELL) {

        Position position = createPosition(deviceSession);

        decodeStat(position, buf);

        position.setNetwork(
                new Network(CellTower.fromLacCid(buf.readUnsignedShortLE(), buf.readUnsignedShortLE())));

        return position;

    } else if (type == MSG_SC_QUERY_RESPONSE) {

        Position position = createPosition(deviceSession);

        buf.readUnsignedShortLE(); // index
        buf.readUnsignedByte(); // response count
        buf.readUnsignedByte(); // response index

        int failureCount = buf.readUnsignedByte();
        for (int i = 0; i < failureCount; i++) {
            buf.readUnsignedShortLE(); // tag
        }

        int successCount = buf.readUnsignedByte();
        for (int i = 0; i < successCount; i++) {
            buf.readUnsignedShortLE(); // tag
            position.set(Position.KEY_RESULT,
                    buf.readSlice(buf.readUnsignedShortLE()).toString(StandardCharsets.US_ASCII));
        }

        return position;

    }

    return null;
}

From source file:org.traccar.protocol.CastelProtocolDecoder.java

License:Apache License

@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

    ByteBuf buf = (ByteBuf) msg;

    int header = buf.readUnsignedShortLE();
    buf.readUnsignedShortLE(); // length

    int version = -1;
    if (header == 0x4040) {
        version = buf.readUnsignedByte();
    }/*from  w w  w .  j av  a  2  s.  c o m*/

    ByteBuf id = buf.readSlice(20);
    short type = buf.readShort();

    DeviceSession deviceSession = getDeviceSession(channel, remoteAddress,
            id.toString(StandardCharsets.US_ASCII).trim());
    if (deviceSession == null) {
        return null;
    }

    switch (version) {
    case -1:
        return decodeMpip(channel, remoteAddress, buf, version, id, type, deviceSession);
    case 3:
    case 4:
        return decodeSc(channel, remoteAddress, buf, version, id, type, deviceSession);
    default:
        return decodeCc(channel, remoteAddress, buf, version, id, type, deviceSession);
    }
}