/* * Copyright 2012 - 2024 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.helper.BufferUtil; import org.traccar.session.DeviceSession; import org.traccar.NetworkMessage; import org.traccar.Protocol; import org.traccar.helper.BcdUtil; import org.traccar.helper.BitUtil; import org.traccar.helper.Checksum; import org.traccar.helper.DateBuilder; import org.traccar.helper.Parser; import org.traccar.helper.PatternBuilder; import org.traccar.helper.UnitsConverter; import org.traccar.model.CellTower; import org.traccar.model.Network; import org.traccar.model.Position; import org.traccar.model.WifiAccessPoint; import java.net.SocketAddress; import java.nio.charset.StandardCharsets; import java.util.Calendar; import java.util.Date; import java.util.HashMap; import java.util.Map; import java.util.TimeZone; import java.util.regex.Pattern; public class Gt06ProtocolDecoder extends BaseProtocolDecoder { private final Map photos = new HashMap<>(); public Gt06ProtocolDecoder(Protocol protocol) { super(protocol); } public static final int MSG_LOGIN = 0x01; public static final int MSG_GPS = 0x10; public static final int MSG_GPS_LBS_6 = 0x11; public static final int MSG_GPS_LBS_1 = 0x12; public static final int MSG_GPS_LBS_2 = 0x22; public static final int MSG_GPS_LBS_3 = 0x37; public static final int MSG_GPS_LBS_4 = 0x2D; public static final int MSG_STATUS = 0x13; public static final int MSG_SATELLITE = 0x14; public static final int MSG_STRING = 0x15; public static final int MSG_GPS_LBS_STATUS_1 = 0x16; public static final int MSG_WIFI = 0x17; public static final int MSG_GPS_LBS_RFID = 0x17; public static final int MSG_GPS_LBS_STATUS_2 = 0x26; public static final int MSG_GPS_LBS_STATUS_3 = 0x27; public static final int MSG_LBS_MULTIPLE_1 = 0x28; public static final int MSG_LBS_MULTIPLE_2 = 0x2E; public static final int MSG_LBS_MULTIPLE_3 = 0x24; public static final int MSG_LBS_WIFI = 0x2C; public static final int MSG_LBS_EXTEND = 0x18; public static final int MSG_LBS_STATUS = 0x19; public static final int MSG_GPS_PHONE = 0x1A; public static final int MSG_GPS_LBS_EXTEND = 0x1E; // JI09 public static final int MSG_HEARTBEAT = 0x23; // GK310 public static final int MSG_ADDRESS_REQUEST = 0x2A; // GK310 public static final int MSG_ADDRESS_RESPONSE = 0x97; // GK310 public static final int MSG_GPS_LBS_5 = 0x31; // AZ735 & SL4X public static final int MSG_GPS_LBS_STATUS_4 = 0x32; // AZ735 & SL4X public static final int MSG_WIFI_5 = 0x33; // AZ735 & SL4X public static final int MSG_LBS_3 = 0x34; // SL4X public static final int MSG_AZ735_GPS = 0x32; // AZ735 (extended) public static final int MSG_AZ735_ALARM = 0x33; // AZ735 (only extended) public static final int MSG_X1_GPS = 0x34; public static final int MSG_X1_PHOTO_INFO = 0x35; public static final int MSG_X1_PHOTO_DATA = 0x36; public static final int MSG_WIFI_2 = 0x69; public static final int MSG_GPS_MODULAR = 0x70; public static final int MSG_WIFI_4 = 0xF3; public static final int MSG_COMMAND_0 = 0x80; public static final int MSG_COMMAND_1 = 0x81; public static final int MSG_COMMAND_2 = 0x82; public static final int MSG_TIME_REQUEST = 0x8A; // GK310 public static final int MSG_INFO = 0x94; public static final int MSG_SERIAL = 0x9B; public static final int MSG_STRING_INFO = 0x21; public static final int MSG_GPS_LBS_7 = 0xA0; // GK310 & JM-VL03 public static final int MSG_LBS_2 = 0xA1; // GK310 public static final int MSG_WIFI_3 = 0xA2; // GK310 public static final int MSG_GPS_LBS_STATUS_5 = 0xA2; // LWxG public static final int MSG_FENCE_SINGLE = 0xA3; // GK310 public static final int MSG_FENCE_MULTI = 0xA4; // GK310 & JM-LL301 public static final int MSG_LBS_ALARM = 0xA5; // GK310 & JM-LL301 public static final int MSG_LBS_ADDRESS = 0xA7; // GK310 public static final int MSG_OBD = 0x8C; // FM08ABC public static final int MSG_DTC = 0x65; // FM08ABC public static final int MSG_PID = 0x66; // FM08ABC public static final int MSG_BMS = 0x40; // WD-209 public static final int MSG_MULTIMEDIA = 0x41; // WD-209 public static final int MSG_ALARM = 0x95; // JC100 private enum Variant { VXT01, WANWAY_S20, SR411_MINI, GT06E_CARD, BENWAY, S5, SPACE10X, STANDARD, OBD6, WETRUST, JC400, SL4X, SEEWORLD, RFID, LW4G, } private Variant variant; private static final Pattern PATTERN_FUEL = new PatternBuilder() .text("!AIOIL,") .number("d+,") // device address .number("d+.d+,") // output value .number("(d+.d+),") // temperature .expression("[^,]+,") // version .number("dd") // back wave .number("d") // software status code .number("d,") // hardware status code .number("(d+.d+),") // measured value .expression("[01],") // movement status .number("d+,") // excited wave times .number("xx") // checksum .compile(); private static final Pattern PATTERN_LOCATION = new PatternBuilder() .text("Current position!") .number("Lat:([NS])(d+.d+),") // latitude .number("Lon:([EW])(d+.d+),") // longitude .text("Course:").number("(d+.d+),") // course .text("Speed:").number("(d+.d+),") // speed .text("DateTime:") .number("(dddd)-(dd)-(dd) +") // date .number("(dd):(dd):(dd)") // time .compile(); private static boolean isSupported(int type) { return hasGps(type) || hasLbs(type) || hasStatus(type); } private static boolean hasGps(int type) { switch (type) { case MSG_GPS: case MSG_GPS_LBS_1: case MSG_GPS_LBS_2: case MSG_GPS_LBS_3: case MSG_GPS_LBS_4: case MSG_GPS_LBS_5: case MSG_GPS_LBS_6: case MSG_GPS_LBS_STATUS_1: case MSG_GPS_LBS_STATUS_2: case MSG_GPS_LBS_STATUS_3: case MSG_GPS_LBS_STATUS_4: case MSG_GPS_LBS_STATUS_5: case MSG_GPS_PHONE: case MSG_GPS_LBS_EXTEND: case MSG_GPS_LBS_7: case MSG_GPS_LBS_RFID: case MSG_FENCE_SINGLE: case MSG_FENCE_MULTI: return true; default: return false; } } private static boolean hasLbs(int type) { switch (type) { case MSG_LBS_STATUS: case MSG_GPS_LBS_1: case MSG_GPS_LBS_2: case MSG_GPS_LBS_3: case MSG_GPS_LBS_4: case MSG_GPS_LBS_5: case MSG_GPS_LBS_6: case MSG_GPS_LBS_STATUS_1: case MSG_GPS_LBS_STATUS_2: case MSG_GPS_LBS_STATUS_3: case MSG_GPS_LBS_STATUS_4: case MSG_GPS_LBS_STATUS_5: case MSG_GPS_LBS_7: case MSG_GPS_LBS_RFID: case MSG_FENCE_SINGLE: case MSG_FENCE_MULTI: case MSG_LBS_ALARM: case MSG_LBS_ADDRESS: return true; default: return false; } } private static boolean hasStatus(int type) { switch (type) { case MSG_STATUS: case MSG_LBS_STATUS: case MSG_GPS_LBS_STATUS_1: case MSG_GPS_LBS_STATUS_2: case MSG_GPS_LBS_STATUS_3: case MSG_GPS_LBS_STATUS_4: case MSG_GPS_LBS_STATUS_5: case MSG_FENCE_MULTI: case MSG_LBS_ALARM: return true; default: return false; } } private static boolean hasLanguage(int type) { switch (type) { case MSG_GPS_PHONE: case MSG_HEARTBEAT: case MSG_GPS_LBS_STATUS_3: case MSG_LBS_MULTIPLE_1: case MSG_LBS_MULTIPLE_2: case MSG_LBS_2: case MSG_FENCE_MULTI: return true; default: return false; } } private void sendResponse(Channel channel, boolean extended, int type, int index, ByteBuf content) { if (channel != null) { ByteBuf response = Unpooled.buffer(); int length = 5 + (content != null ? content.readableBytes() : 0); if (extended) { response.writeShort(0x7979); response.writeShort(length); } else { response.writeShort(0x7878); response.writeByte(length); } response.writeByte(type); if (content != null) { response.writeBytes(content); content.release(); } response.writeShort(index); response.writeShort(Checksum.crc16(Checksum.CRC16_X25, response.nioBuffer(2, response.writerIndex() - 2))); response.writeByte('\r'); response.writeByte('\n'); channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress())); } } private void sendPhotoRequest(Channel channel, int pictureId) { ByteBuf photo = photos.get(pictureId); ByteBuf content = Unpooled.buffer(); content.writeInt(pictureId); content.writeInt(photo.writerIndex()); content.writeShort(Math.min(photo.writableBytes(), 1024)); sendResponse(channel, false, MSG_X1_PHOTO_DATA, 0, content); } public static boolean decodeGps(Position position, ByteBuf buf, boolean hasLength, TimeZone timezone) { return decodeGps(position, buf, hasLength, true, true, false, timezone); } public static boolean decodeGps( Position position, ByteBuf buf, boolean hasLength, boolean hasSatellites, boolean hasSpeed, boolean longSpeed, TimeZone timezone) { DateBuilder dateBuilder = new DateBuilder(timezone) .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()) .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()); position.setTime(dateBuilder.getDate()); if (hasLength && buf.readUnsignedByte() == 0) { return false; } if (hasSatellites) { position.set(Position.KEY_SATELLITES, BitUtil.to(buf.readUnsignedByte(), 4)); } double latitude = buf.readUnsignedInt() / 60.0 / 30000.0; double longitude = buf.readUnsignedInt() / 60.0 / 30000.0; if (hasSpeed) { position.setSpeed(UnitsConverter.knotsFromKph( longSpeed ? buf.readUnsignedShort() : buf.readUnsignedByte())); } int flags = buf.readUnsignedShort(); position.setCourse(BitUtil.to(flags, 10)); position.setValid(BitUtil.check(flags, 12)); if (!BitUtil.check(flags, 10)) { latitude = -latitude; } if (BitUtil.check(flags, 11)) { longitude = -longitude; } position.setLatitude(latitude); position.setLongitude(longitude); if (BitUtil.check(flags, 14)) { position.set(Position.KEY_IGNITION, BitUtil.check(flags, 15)); } return true; } private boolean decodeLbs(Position position, ByteBuf buf, int type, boolean hasLength) { int length = 0; if (hasLength) { length = buf.readUnsignedByte(); if (length == 0) { boolean zeroedData = true; for (int i = buf.readerIndex() + 9; i < buf.readerIndex() + 45 && i < buf.writerIndex(); i++) { if (buf.getByte(i) != 0) { zeroedData = false; break; } } if (zeroedData) { buf.skipBytes(Math.min(buf.readableBytes(), 45)); } return false; } } int mcc = buf.readUnsignedShort(); int mnc; if (BitUtil.check(mcc, 15) || type == MSG_GPS_LBS_6 || variant == Variant.SL4X) { mnc = buf.readUnsignedShort(); } else { mnc = buf.readUnsignedByte(); } int lac; if (type == MSG_LBS_ALARM || type == MSG_GPS_LBS_7 || type == MSG_GPS_LBS_STATUS_5) { lac = buf.readInt(); } else { lac = buf.readUnsignedShort(); } long cid; if (type == MSG_LBS_ALARM || type == MSG_GPS_LBS_7 || variant == Variant.SL4X || type == MSG_GPS_LBS_STATUS_5) { cid = buf.readLong(); } else if (type == MSG_GPS_LBS_6 || variant == Variant.SEEWORLD) { cid = buf.readUnsignedInt(); } else { cid = buf.readUnsignedMedium(); } position.setNetwork(new Network(CellTower.from(BitUtil.to(mcc, 15), mnc, lac, cid))); if (length > 9) { buf.skipBytes(length - 9); } return true; } private void decodeStatus(Position position, ByteBuf buf) { int status = buf.readUnsignedByte(); position.set(Position.KEY_STATUS, status); position.set(Position.KEY_IGNITION, BitUtil.check(status, 1)); position.set(Position.KEY_CHARGE, BitUtil.check(status, 2)); position.set(Position.KEY_BLOCKED, BitUtil.check(status, 7)); switch (BitUtil.between(status, 3, 6)) { case 1: position.set(Position.KEY_ALARM, Position.ALARM_VIBRATION); break; case 2: position.set(Position.KEY_ALARM, Position.ALARM_POWER_CUT); break; case 3: position.set(Position.KEY_ALARM, Position.ALARM_LOW_BATTERY); break; case 4: position.set(Position.KEY_ALARM, Position.ALARM_SOS); break; case 6: position.set(Position.KEY_ALARM, Position.ALARM_GEOFENCE); break; case 7: if (variant == Variant.VXT01) { position.set(Position.KEY_ALARM, Position.ALARM_OVERSPEED); } else { position.set(Position.KEY_ALARM, Position.ALARM_REMOVING); } break; default: break; } } private String decodeAlarm(short value, String model) { boolean modelLW = model != null && model.toUpperCase().startsWith("LW"); switch (value) { case 0x01: return Position.ALARM_SOS; case 0x02: return Position.ALARM_POWER_CUT; case 0x03: case 0x09: return Position.ALARM_VIBRATION; case 0x04: return Position.ALARM_GEOFENCE_ENTER; case 0x05: return Position.ALARM_GEOFENCE_EXIT; case 0x06: return Position.ALARM_OVERSPEED; case 0x0E: case 0x0F: return Position.ALARM_LOW_BATTERY; case 0x11: return Position.ALARM_POWER_OFF; case 0x0C: case 0x13: case 0x25: return Position.ALARM_TAMPERING; case 0x14: return Position.ALARM_DOOR; case 0x18: return modelLW ? Position.ALARM_ACCIDENT : Position.ALARM_REMOVING; case 0x19: return modelLW ? Position.ALARM_ACCELERATION : Position.ALARM_LOW_BATTERY; case 0x1A: case 0x28: return Position.ALARM_BRAKING; case 0x1B: case 0x2A: case 0x2B: case 0x2E: return Position.ALARM_CORNERING; case 0x23: return Position.ALARM_FALL_DOWN; case 0x29: return Position.ALARM_ACCELERATION; case 0x2C: return Position.ALARM_ACCIDENT; case 0x30: return Position.ALARM_JAMMING; default: return null; } } private Object decodeBasic(Channel channel, SocketAddress remoteAddress, ByteBuf buf) { int length = buf.readUnsignedByte(); int dataLength = length - 5; int type = buf.readUnsignedByte(); Position position = new Position(getProtocolName()); DeviceSession deviceSession = null; if (type != MSG_LOGIN) { deviceSession = getDeviceSession(channel, remoteAddress); if (deviceSession == null) { return null; } position.setDeviceId(deviceSession.getDeviceId()); if (!deviceSession.contains(DeviceSession.KEY_TIMEZONE)) { deviceSession.set(DeviceSession.KEY_TIMEZONE, getTimeZone(deviceSession.getDeviceId())); } } if (type == MSG_LOGIN) { String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(1); buf.readUnsignedShort(); // type deviceSession = getDeviceSession(channel, remoteAddress, imei); if (deviceSession != null) { TimeZone timeZone = getTimeZone(deviceSession.getDeviceId(), null); if (timeZone == null && dataLength > 10) { int extensionBits = buf.readUnsignedShort(); int hours = (extensionBits >> 4) / 100; int minutes = (extensionBits >> 4) % 100; int offset = (hours * 60 + minutes) * 60; if ((extensionBits & 0x8) != 0) { offset = -offset; } timeZone = TimeZone.getTimeZone("UTC"); timeZone.setRawOffset(offset * 1000); } deviceSession.set(DeviceSession.KEY_TIMEZONE, timeZone); sendResponse(channel, false, type, buf.getShort(buf.writerIndex() - 6), null); } return null; } else if (type == MSG_HEARTBEAT) { getLastLocation(position, null); int status = buf.readUnsignedByte(); position.set(Position.KEY_ARMED, BitUtil.check(status, 0)); position.set(Position.KEY_IGNITION, BitUtil.check(status, 1)); position.set(Position.KEY_CHARGE, BitUtil.check(status, 2)); if (buf.readableBytes() >= 2 + 6) { position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.01); } if (buf.readableBytes() >= 1 + 6) { position.set(Position.KEY_RSSI, buf.readUnsignedByte()); } sendResponse(channel, false, type, buf.getShort(buf.writerIndex() - 6), null); return position; } else if (type == MSG_ADDRESS_REQUEST) { String response = "NA&&NA&&0##"; ByteBuf content = Unpooled.buffer(); content.writeByte(response.length()); content.writeInt(0); content.writeBytes(response.getBytes(StandardCharsets.US_ASCII)); sendResponse(channel, true, MSG_ADDRESS_RESPONSE, 0, content); return null; } else if (type == MSG_TIME_REQUEST) { Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC")); ByteBuf content = Unpooled.buffer(); content.writeByte(calendar.get(Calendar.YEAR) - 2000); content.writeByte(calendar.get(Calendar.MONTH) + 1); content.writeByte(calendar.get(Calendar.DAY_OF_MONTH)); content.writeByte(calendar.get(Calendar.HOUR_OF_DAY)); content.writeByte(calendar.get(Calendar.MINUTE)); content.writeByte(calendar.get(Calendar.SECOND)); sendResponse(channel, false, MSG_TIME_REQUEST, 0, content); return null; } else if (type == MSG_X1_GPS && variant != Variant.SL4X) { buf.readUnsignedInt(); // data and alarm decodeGps(position, buf, false, deviceSession.get(DeviceSession.KEY_TIMEZONE)); buf.readUnsignedShort(); // terminal info position.set(Position.KEY_ODOMETER, buf.readUnsignedInt()); position.setNetwork(new Network(CellTower.from( buf.readUnsignedShort(), buf.readUnsignedByte(), buf.readUnsignedShort(), buf.readUnsignedInt()))); long driverId = buf.readUnsignedInt(); if (driverId > 0) { position.set(Position.KEY_DRIVER_UNIQUE_ID, String.valueOf(driverId)); } position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.01); position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.01); long portInfo = buf.readUnsignedInt(); position.set(Position.KEY_INPUT, buf.readUnsignedByte()); position.set(Position.KEY_OUTPUT, buf.readUnsignedByte()); for (int i = 1; i <= BitUtil.between(portInfo, 20, 24); i++) { position.set(Position.PREFIX_ADC + i, buf.readUnsignedShort() * 0.01); } return position; } else if (type == MSG_X1_PHOTO_INFO) { buf.skipBytes(6); // time buf.readUnsignedByte(); // fix status buf.readUnsignedInt(); // latitude buf.readUnsignedInt(); // longitude buf.readUnsignedByte(); // camera id buf.readUnsignedByte(); // photo source buf.readUnsignedByte(); // picture format ByteBuf photo = Unpooled.buffer(buf.readInt()); int pictureId = buf.readInt(); photos.put(pictureId, photo); sendPhotoRequest(channel, pictureId); return null; } else if ((type == MSG_WIFI && variant != Variant.RFID) || type == MSG_WIFI_2 || type == MSG_WIFI_4) { ByteBuf time = buf.readSlice(6); DateBuilder dateBuilder = new DateBuilder() .setYear(BcdUtil.readInteger(time, 2)) .setMonth(BcdUtil.readInteger(time, 2)) .setDay(BcdUtil.readInteger(time, 2)) .setHour(BcdUtil.readInteger(time, 2)) .setMinute(BcdUtil.readInteger(time, 2)) .setSecond(BcdUtil.readInteger(time, 2)); getLastLocation(position, dateBuilder.getDate()); Network network = new Network(); int wifiCount; if (type == MSG_WIFI_4) { wifiCount = buf.readUnsignedByte(); } else { wifiCount = buf.getUnsignedByte(2); } for (int i = 0; i < wifiCount; i++) { if (type == MSG_WIFI_4) { buf.skipBytes(2); } WifiAccessPoint wifiAccessPoint = new WifiAccessPoint(); wifiAccessPoint.setMacAddress(String.format("%02x:%02x:%02x:%02x:%02x:%02x", buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())); if (type != MSG_WIFI_4) { wifiAccessPoint.setSignalStrength((int) buf.readUnsignedByte()); } network.addWifiAccessPoint(wifiAccessPoint); } if (type != MSG_WIFI_4) { int cellCount = buf.readUnsignedByte(); int mcc = buf.readUnsignedShort(); int mnc = buf.readUnsignedByte(); for (int i = 0; i < cellCount; i++) { network.addCellTower(CellTower.from( mcc, mnc, buf.readUnsignedShort(), buf.readUnsignedShort(), buf.readUnsignedByte())); } if (channel != null) { ByteBuf response = Unpooled.buffer(); response.writeShort(0x7878); response.writeByte(0); response.writeByte(type); response.writeBytes(time.resetReaderIndex()); response.writeByte('\r'); response.writeByte('\n'); channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress())); } } position.setNetwork(network); return position; } else if (type == MSG_INFO) { getLastLocation(position, null); position.set(Position.KEY_POWER, buf.readShort() * 0.01); return position; } else if (type == MSG_LBS_MULTIPLE_3 && variant == Variant.SR411_MINI) { decodeGps(position, buf, false, deviceSession.get(DeviceSession.KEY_TIMEZONE)); decodeLbs(position, buf, type, false); position.set(Position.KEY_IGNITION, buf.readUnsignedByte() > 0); position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.01); position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.01); return position; } else if (type == MSG_LBS_MULTIPLE_1 || type == MSG_LBS_MULTIPLE_2 || type == MSG_LBS_MULTIPLE_3 || type == MSG_LBS_EXTEND || type == MSG_LBS_WIFI || type == MSG_LBS_2 || type == MSG_LBS_3 || (type == MSG_WIFI_3 && variant != Variant.LW4G) || type == MSG_WIFI_5) { DateBuilder dateBuilder = new DateBuilder((TimeZone) deviceSession.get(DeviceSession.KEY_TIMEZONE)) .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()) .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()); getLastLocation(position, dateBuilder.getDate()); if (variant == Variant.WANWAY_S20 || variant == Variant.SL4X) { buf.readUnsignedByte(); // ta } int mcc = buf.readUnsignedShort(); int mnc = BitUtil.check(mcc, 15) || variant == Variant.SL4X ? buf.readUnsignedShort() : buf.readUnsignedByte(); Network network = new Network(); int cellCount = variant == Variant.WANWAY_S20 ? buf.readUnsignedByte() : type == MSG_WIFI_5 ? 6 : 7; for (int i = 0; i < cellCount; i++) { int lac; int cid; if (type == MSG_LBS_2 || type == MSG_WIFI_3) { lac = buf.readInt(); cid = (int) buf.readLong(); } else if (type == MSG_WIFI_5 || type == MSG_LBS_3) { lac = buf.readUnsignedShort(); cid = (int) buf.readUnsignedInt(); } else { lac = buf.readUnsignedShort(); cid = buf.readUnsignedMedium(); } int rssi = -buf.readUnsignedByte(); if (lac > 0) { network.addCellTower(CellTower.from(BitUtil.to(mcc, 15), mnc, lac, cid, rssi)); } } if (variant != Variant.WANWAY_S20 && variant != Variant.SL4X) { buf.readUnsignedByte(); // ta } if (type != MSG_LBS_MULTIPLE_1 && type != MSG_LBS_MULTIPLE_2 && type != MSG_LBS_MULTIPLE_3 && type != MSG_LBS_2 && type != MSG_LBS_3) { int wifiCount = buf.readUnsignedByte(); for (int i = 0; i < wifiCount; i++) { String mac = ByteBufUtil.hexDump(buf.readSlice(6)).replaceAll("(..)", "$1:"); network.addWifiAccessPoint(WifiAccessPoint.from( mac.substring(0, mac.length() - 1), buf.readUnsignedByte())); } } position.setNetwork(network); } else if (type == MSG_STRING) { getLastLocation(position, null); int commandLength = buf.readUnsignedByte(); if (commandLength > 0) { buf.readUnsignedInt(); // server flag (reserved) String data = buf.readSlice(commandLength - 4).toString(StandardCharsets.US_ASCII); if (data.startsWith(" 6) { boolean hasLength = hasStatus(type) && type != MSG_LBS_STATUS && type != MSG_LBS_ALARM && (type != MSG_GPS_LBS_STATUS_1 || variant != Variant.VXT01) && type != MSG_GPS_LBS_STATUS_5; decodeLbs(position, buf, type, hasLength); } if (hasStatus(type)) { if (type == MSG_GPS_LBS_STATUS_5) { buf.readUnsignedByte(); // network indicator } decodeStatus(position, buf); if (variant == Variant.OBD6) { int signal = buf.readUnsignedShort(); int satellites = BitUtil.between(signal, 10, 15) + BitUtil.between(signal, 5, 10); position.set(Position.KEY_SATELLITES, satellites); position.set(Position.KEY_RSSI, BitUtil.to(signal, 5)); position.set(Position.KEY_ALARM, decodeAlarm( buf.readUnsignedByte(), getDeviceModel(deviceSession))); buf.readUnsignedByte(); // language position.set(Position.KEY_BATTERY_LEVEL, buf.readUnsignedByte()); buf.readUnsignedByte(); // working mode position.set(Position.KEY_POWER, buf.readUnsignedShort() / 100.0); } else { if (type == MSG_GPS_LBS_STATUS_5) { position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.01); } int battery = buf.readUnsignedByte(); position.set(Position.KEY_BATTERY_LEVEL, battery <= 6 ? battery * 100 / 6 : battery); position.set(Position.KEY_RSSI, buf.readUnsignedByte()); short alarmExtension = buf.readUnsignedByte(); if (variant != Variant.VXT01) { position.set(Position.KEY_ALARM, decodeAlarm(alarmExtension, getDeviceModel(deviceSession))); } } } if (type == MSG_GPS_LBS_STATUS_5) { buf.readUnsignedByte(); // language position.set(Position.KEY_ODOMETER, buf.readUnsignedInt()); position.set(Position.KEY_HOURS, buf.readUnsignedInt() * 1000); buf.skipBytes(8); // terminal id position.set(Position.KEY_INPUT, buf.readUnsignedShort()); } if (type == MSG_GPS_LBS_1) { if (variant == Variant.GT06E_CARD) { position.set(Position.KEY_ODOMETER, buf.readUnsignedInt()); String data = buf.readCharSequence(buf.readUnsignedByte(), StandardCharsets.US_ASCII).toString(); buf.readUnsignedByte(); // alarm buf.readUnsignedByte(); // swiped position.set(Position.KEY_CARD, data.trim()); } else if (variant == Variant.BENWAY) { int mask = buf.readUnsignedShort(); position.set(Position.KEY_IGNITION, BitUtil.check(mask, 8 + 7)); position.set(Position.PREFIX_IN + 2, BitUtil.check(mask, 8 + 6)); if (BitUtil.check(mask, 8 + 4)) { int value = BitUtil.to(mask, 8 + 1); if (BitUtil.check(mask, 8 + 1)) { value = -value; } position.set(Position.PREFIX_TEMP + 1, value); } else { int value = BitUtil.to(mask, 8 + 2); if (BitUtil.check(mask, 8 + 5)) { position.set(Position.PREFIX_ADC + 1, value); } else { position.set(Position.PREFIX_ADC + 1, value * 0.1); } } } else if (variant == Variant.VXT01) { decodeStatus(position, buf); position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.01); position.set(Position.KEY_RSSI, buf.readUnsignedByte()); buf.readUnsignedByte(); // alarm extension } else if (variant == Variant.S5) { decodeStatus(position, buf); position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.01); position.set(Position.KEY_RSSI, buf.readUnsignedByte()); position.set(Position.KEY_ALARM, decodeAlarm( buf.readUnsignedByte(), getDeviceModel(deviceSession))); position.set("oil", buf.readUnsignedShort()); int temperature = buf.readUnsignedByte(); if (BitUtil.check(temperature, 7)) { temperature = -BitUtil.to(temperature, 7); } position.set(Position.PREFIX_TEMP + 1, temperature); position.set(Position.KEY_ODOMETER, buf.readUnsignedInt() * 10); } else if (variant == Variant.WETRUST) { position.set(Position.KEY_ODOMETER, buf.readUnsignedInt()); position.set(Position.KEY_CARD, buf.readCharSequence( buf.readUnsignedByte(), StandardCharsets.US_ASCII).toString()); position.set(Position.KEY_ALARM, buf.readUnsignedByte() > 0 ? Position.ALARM_GENERAL : null); position.set("cardStatus", buf.readUnsignedByte()); position.set(Position.KEY_DRIVING_TIME, buf.readUnsignedShort()); } } if (type == MSG_GPS_LBS_2 && variant == Variant.SEEWORLD) { position.set(Position.KEY_IGNITION, buf.readUnsignedByte() > 0); buf.readUnsignedByte(); // reporting mode buf.readUnsignedByte(); // supplementary transmission position.set(Position.KEY_ODOMETER, buf.readUnsignedInt()); buf.readUnsignedInt(); // travel time int temperature = buf.readUnsignedShort(); if (BitUtil.check(temperature, 15)) { temperature = -BitUtil.to(temperature, 15); } position.set(Position.PREFIX_TEMP + 1, temperature * 0.01); position.set("humidity", buf.readUnsignedShort() * 0.01); } if (type == MSG_GPS_LBS_STATUS_4 && variant == Variant.SL4X) { position.setAltitude(buf.readShort()); } if ((type == MSG_GPS_LBS_2 || type == MSG_GPS_LBS_3 || type == MSG_GPS_LBS_4 || type == MSG_GPS_LBS_5) && buf.readableBytes() >= 3 + 6) { position.set(Position.KEY_IGNITION, buf.readUnsignedByte() > 0); position.set(Position.KEY_EVENT, buf.readUnsignedByte()); // reason position.set(Position.KEY_ARCHIVE, buf.readUnsignedByte() > 0); if (variant == Variant.SL4X) { if (buf.readableBytes() > 2 + 6) { position.set(Position.KEY_ODOMETER, buf.readUnsignedInt()); } position.setAltitude(buf.readShort()); } } if (type == MSG_GPS_LBS_3) { int module = buf.readUnsignedShort(); int subLength = buf.readUnsignedByte(); switch (module) { case 0x0027: position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.01); break; case 0x002E: position.set(Position.KEY_ODOMETER, buf.readUnsignedInt()); break; case 0x003B: position.setAccuracy(buf.readUnsignedShort() * 0.01); break; default: buf.skipBytes(subLength); break; } } if (type == MSG_GPS_LBS_RFID) { position.set(Position.KEY_DRIVER_UNIQUE_ID, ByteBufUtil.hexDump(buf.readSlice(8))); buf.readUnsignedByte(); // validity } if (buf.readableBytes() == 3 + 6 || buf.readableBytes() == 3 + 4 + 6) { position.set(Position.KEY_IGNITION, buf.readUnsignedByte() > 0); buf.readUnsignedByte(); // upload mode position.set(Position.KEY_ARCHIVE, buf.readUnsignedByte() > 0 ? true : null); } if (buf.readableBytes() == 4 + 6) { position.set(Position.KEY_ODOMETER, buf.readUnsignedInt()); } } else if (type == MSG_ALARM) { boolean extendedAlarm = dataLength > 7; if (extendedAlarm) { if (variant == Variant.JC400) { buf.readUnsignedShort(); // marker buf.readUnsignedByte(); // version } decodeGps( position, buf, false, variant == Variant.JC400, variant == Variant.JC400, variant == Variant.JC400, deviceSession.get(DeviceSession.KEY_TIMEZONE)); } else { DateBuilder dateBuilder = new DateBuilder((TimeZone) deviceSession.get(DeviceSession.KEY_TIMEZONE)) .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()) .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()); getLastLocation(position, dateBuilder.getDate()); } if (variant == Variant.JC400) { position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.1); } short event = buf.readUnsignedByte(); position.set(Position.KEY_EVENT, event); switch (event) { case 0x01: position.set(Position.KEY_ALARM, extendedAlarm ? Position.ALARM_SOS : Position.ALARM_GENERAL); break; case 0x0E: position.set(Position.KEY_ALARM, Position.ALARM_LOW_POWER); break; case 0x76: position.set(Position.KEY_ALARM, Position.ALARM_TEMPERATURE); break; case 0x80: position.set(Position.KEY_ALARM, Position.ALARM_VIBRATION); break; case 0x87: position.set(Position.KEY_ALARM, Position.ALARM_OVERSPEED); break; case 0x88: position.set(Position.KEY_ALARM, Position.ALARM_POWER_CUT); break; case 0x90: position.set(Position.KEY_ALARM, Position.ALARM_ACCELERATION); break; case 0x91: position.set(Position.KEY_ALARM, Position.ALARM_BRAKING); break; case 0x92: position.set(Position.KEY_ALARM, Position.ALARM_CORNERING); break; case 0x93: position.set(Position.KEY_ALARM, Position.ALARM_ACCIDENT); break; default: break; } } else { if (dataLength > 0) { buf.skipBytes(dataLength); } if (type != MSG_COMMAND_0 && type != MSG_COMMAND_1 && type != MSG_COMMAND_2) { sendResponse(channel, false, type, buf.getShort(buf.writerIndex() - 6), null); } return null; } if (hasLanguage(type)) { buf.readUnsignedShort(); } if (type == MSG_GPS_LBS_STATUS_3 || type == MSG_FENCE_MULTI) { position.set(Position.KEY_GEOFENCE, buf.readUnsignedByte()); } sendResponse(channel, false, type, buf.getShort(buf.writerIndex() - 6), null); return position; } private Object decodeExtended(Channel channel, SocketAddress remoteAddress, ByteBuf buf) { DeviceSession deviceSession = getDeviceSession(channel, remoteAddress); if (deviceSession == null) { return null; } if (!deviceSession.contains(DeviceSession.KEY_TIMEZONE)) { deviceSession.set(DeviceSession.KEY_TIMEZONE, getTimeZone(deviceSession.getDeviceId())); } Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); buf.readUnsignedShort(); // length int type = buf.readUnsignedByte(); if (type == MSG_STRING_INFO) { buf.readUnsignedInt(); // server flag String data; if (buf.readUnsignedByte() == 1) { data = buf.readSlice(buf.readableBytes() - 6).toString(StandardCharsets.US_ASCII); } else { data = buf.readSlice(buf.readableBytes() - 6).toString(StandardCharsets.UTF_16BE); } Parser parser = new Parser(PATTERN_LOCATION, data); if (parser.matches()) { position.setValid(true); position.setLatitude(parser.nextCoordinate(Parser.CoordinateFormat.HEM_DEG)); position.setLongitude(parser.nextCoordinate(Parser.CoordinateFormat.HEM_DEG)); position.setCourse(parser.nextDouble()); position.setSpeed(parser.nextDouble()); position.setTime(parser.nextDateTime(Parser.DateTimeFormat.YMD_HMS)); } else { getLastLocation(position, null); position.set(Position.KEY_RESULT, data); } return position; } else if (type == MSG_INFO) { int subType = buf.readUnsignedByte(); getLastLocation(position, null); if (subType == 0x00) { position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShort() * 0.01); return position; } else if (subType == 0x04) { CharSequence content = buf.readCharSequence(buf.readableBytes() - 4 - 2, StandardCharsets.US_ASCII); String[] values = content.toString().split(";"); for (String value : values) { String[] pair = value.split("="); switch (pair[0]) { case "ALM1": case "ALM2": case "ALM3": position.set("alarm" + pair[0].charAt(3) + "Status", Integer.parseInt(pair[1], 16)); case "STA1": position.set("otherStatus", Integer.parseInt(pair[1], 16)); break; case "DYD": position.set("engineStatus", Integer.parseInt(pair[1], 16)); break; default: break; } } return position; } else if (subType == 0x05) { if (buf.readableBytes() >= 6 + 1 + 6) { DateBuilder dateBuilder = new DateBuilder((TimeZone) deviceSession.get(DeviceSession.KEY_TIMEZONE)) .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()) .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()); position.setDeviceTime(dateBuilder.getDate()); } int flags = buf.readUnsignedByte(); position.set(Position.KEY_DOOR, BitUtil.check(flags, 0)); position.set(Position.PREFIX_IO + 1, BitUtil.check(flags, 2)); return position; } else if (subType == 0x0a) { buf.skipBytes(8); // imei buf.skipBytes(8); // imsi position.set(Position.KEY_ICCID, ByteBufUtil.hexDump(buf.readSlice(10)).replaceAll("f", "")); return position; } else if (subType == 0x0b) { position.set("networkTechnology", buf.readByte() > 0 ? "4G" : "2G"); return position; } else if (subType == 0x0d) { if (buf.getByte(buf.readerIndex()) != '!') { buf.skipBytes(6); } Parser parser = new Parser(PATTERN_FUEL, buf.toString( buf.readerIndex(), buf.readableBytes() - 4 - 2, StandardCharsets.US_ASCII)); if (!parser.matches()) { return null; } position.set(Position.PREFIX_TEMP + 1, parser.nextDouble(0)); position.set(Position.KEY_FUEL_LEVEL, parser.nextDouble(0)); return position; } else if (subType == 0x1b) { if (Character.isLetter(buf.getUnsignedByte(buf.readerIndex()))) { String data = buf.readCharSequence(buf.readableBytes() - 6, StandardCharsets.US_ASCII).toString(); position.set("serial", data.trim()); } else { buf.readUnsignedByte(); // header buf.readUnsignedByte(); // type position.set(Position.KEY_DRIVER_UNIQUE_ID, ByteBufUtil.hexDump(buf.readSlice(4))); buf.readUnsignedByte(); // checksum buf.readUnsignedByte(); // footer } return position; } } else if (type == MSG_X1_PHOTO_DATA) { int pictureId = buf.readInt(); ByteBuf photo = photos.get(pictureId); buf.readUnsignedInt(); // offset buf.readBytes(photo, buf.readUnsignedShort()); if (photo.writableBytes() > 0) { sendPhotoRequest(channel, pictureId); } else { position.set(Position.KEY_IMAGE, writeMediaFile(deviceSession.getUniqueId(), photo, "jpg")); photos.remove(pictureId).release(); } } else if (type == MSG_AZ735_GPS || type == MSG_AZ735_ALARM) { if (!decodeGps(position, buf, true, deviceSession.get(DeviceSession.KEY_TIMEZONE))) { getLastLocation(position, position.getDeviceTime()); } if (decodeLbs(position, buf, type, true)) { position.set(Position.KEY_RSSI, buf.readUnsignedByte()); } buf.skipBytes(buf.readUnsignedByte()); // additional cell towers buf.skipBytes(buf.readUnsignedByte()); // wifi access point int status = buf.readUnsignedByte(); position.set(Position.KEY_STATUS, status); if (type == MSG_AZ735_ALARM) { switch (status) { case 0xA0: position.set(Position.KEY_ARMED, true); break; case 0xA1: position.set(Position.KEY_ARMED, false); break; case 0xA2: case 0xA3: position.set(Position.KEY_ALARM, Position.ALARM_LOW_BATTERY); break; case 0xA4: position.set(Position.KEY_ALARM, Position.ALARM_GENERAL); break; case 0xA5: position.set(Position.KEY_ALARM, Position.ALARM_DOOR); break; default: break; } } buf.skipBytes(buf.readUnsignedByte()); // reserved extension sendResponse(channel, true, type, buf.getShort(buf.writerIndex() - 6), null); return position; } else if (type == MSG_OBD) { DateBuilder dateBuilder = new DateBuilder((TimeZone) deviceSession.get(DeviceSession.KEY_TIMEZONE)) .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()) .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()); getLastLocation(position, dateBuilder.getDate()); position.set(Position.KEY_IGNITION, buf.readUnsignedByte() > 0); String data = buf.readCharSequence(buf.readableBytes() - 18, StandardCharsets.US_ASCII).toString(); for (String pair : data.split(",")) { String[] values = pair.split("="); if (values.length >= 2) { switch (Integer.parseInt(values[0].substring(0, 2), 16)) { case 40: position.set(Position.KEY_ODOMETER, Integer.parseInt(values[1], 16) * 0.01); break; case 43: position.set(Position.KEY_FUEL_LEVEL, Integer.parseInt(values[1], 16) * 0.01); break; case 45: position.set(Position.KEY_COOLANT_TEMP, Integer.parseInt(values[1], 16) * 0.01); break; case 53: position.set(Position.KEY_OBD_SPEED, Integer.parseInt(values[1], 16) * 0.01); break; case 54: position.set(Position.KEY_RPM, Integer.parseInt(values[1], 16) * 0.01); break; case 71: position.set(Position.KEY_FUEL_USED, Integer.parseInt(values[1], 16) * 0.01); break; case 73: position.set(Position.KEY_HOURS, Integer.parseInt(values[1], 16) * 0.01); break; case 74: position.set(Position.KEY_VIN, values[1]); break; default: break; } } } return position; } else if (type == MSG_GPS_MODULAR) { while (buf.readableBytes() > 6) { int moduleType = buf.readUnsignedShort(); int moduleLength = buf.readUnsignedShort(); switch (moduleType) { case 0x03: position.set(Position.KEY_ICCID, ByteBufUtil.hexDump(buf.readSlice(10))); break; case 0x09: position.set(Position.KEY_SATELLITES, buf.readUnsignedByte()); break; case 0x0a: position.set(Position.KEY_SATELLITES_VISIBLE, buf.readUnsignedByte()); break; case 0x11: CellTower cellTower = CellTower.from( buf.readUnsignedShort(), buf.readUnsignedShort(), buf.readUnsignedShort(), buf.readUnsignedMedium(), buf.readUnsignedByte()); if (cellTower.getCellId() > 0) { position.setNetwork(new Network(cellTower)); } break; case 0x18: position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.01); break; case 0x28: position.set(Position.KEY_HDOP, buf.readUnsignedByte() * 0.1); break; case 0x29: position.set(Position.KEY_INDEX, buf.readUnsignedInt()); break; case 0x2a: int input = buf.readUnsignedByte(); position.set(Position.KEY_DOOR, BitUtil.to(input, 4) > 0); position.set("tamper", BitUtil.from(input, 4) > 0); break; case 0x2b: int event = buf.readUnsignedByte(); switch (event) { case 0x11: position.set(Position.KEY_ALARM, Position.ALARM_LOW_BATTERY); break; case 0x12: position.set(Position.KEY_ALARM, Position.ALARM_LOW_POWER); break; case 0x13: position.set(Position.KEY_ALARM, Position.ALARM_POWER_CUT); break; case 0x14: position.set(Position.KEY_ALARM, Position.ALARM_REMOVING); break; default: break; } position.set(Position.KEY_EVENT, event); break; case 0x2e: position.set(Position.KEY_ODOMETER, buf.readUnsignedIntLE()); break; case 0x33: position.setTime(new Date(buf.readUnsignedInt() * 1000)); position.set(Position.KEY_SATELLITES, buf.readUnsignedByte()); position.setAltitude(buf.readShort()); double latitude = buf.readUnsignedInt() / 60.0 / 30000.0; double longitude = buf.readUnsignedInt() / 60.0 / 30000.0; position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte())); int flags = buf.readUnsignedShort(); position.setCourse(BitUtil.to(flags, 10)); position.setValid(BitUtil.check(flags, 12)); if (!BitUtil.check(flags, 10)) { latitude = -latitude; } if (BitUtil.check(flags, 11)) { longitude = -longitude; } position.setLatitude(latitude); position.setLongitude(longitude); break; case 0x34: position.set(Position.KEY_EVENT, buf.readUnsignedByte()); buf.readUnsignedIntLE(); // time buf.skipBytes(buf.readUnsignedByte()); // content break; default: buf.skipBytes(moduleLength); break; } } if (position.getFixTime() == null) { getLastLocation(position, null); } sendResponse(channel, false, MSG_GPS_MODULAR, buf.readUnsignedShort(), null); return position; } else if (type == MSG_MULTIMEDIA) { buf.skipBytes(8); // serial number long timestamp = buf.readUnsignedInt() * 1000; buf.skipBytes(4 + 4 + 2 + 1 + 1 + 2); // gps buf.skipBytes(2 + 2 + 2 + 2); // cell int mediaId = buf.readInt(); int mediaLength = buf.readInt(); int mediaType = buf.readUnsignedByte(); int mediaFormat = buf.readUnsignedByte(); if (mediaType == 0 && mediaFormat == 0) { buf.readUnsignedByte(); // event ByteBuf photo; if (buf.readUnsignedShort() == 0) { photo = Unpooled.buffer(mediaLength); if (photos.containsKey(mediaId)) { photos.remove(mediaId).release(); } photos.put(mediaId, photo); } else { photo = photos.get(mediaId); } if (photo != null) { buf.readBytes(photo, buf.readableBytes() - 3 * 2); if (!photo.isWritable()) { position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); getLastLocation(position, new Date(timestamp)); position.set(Position.KEY_IMAGE, writeMediaFile(deviceSession.getUniqueId(), photo, "jpg")); photos.remove(mediaId).release(); } } } sendResponse(channel, true, type, buf.getShort(buf.writerIndex() - 6), null); return position; } else if (type == MSG_SERIAL) { position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); getLastLocation(position, null); buf.readUnsignedByte(); // external device type code ByteBuf data = buf.readSlice(buf.readableBytes() - 6); // index + checksum + footer if (BufferUtil.isPrintable(data, data.readableBytes())) { String value = data.readCharSequence(data.readableBytes(), StandardCharsets.US_ASCII).toString(); position.set(Position.KEY_RESULT, value.trim()); } else { position.set(Position.KEY_RESULT, ByteBufUtil.hexDump(data)); } return position; } return null; } private void decodeVariant(ByteBuf buf) { int header = buf.getUnsignedShort(buf.readerIndex()); int length; int type; if (header == 0x7878) { length = buf.getUnsignedByte(buf.readerIndex() + 2); type = buf.getUnsignedByte(buf.readerIndex() + 2 + 1); } else { length = buf.getUnsignedShort(buf.readerIndex() + 2); type = buf.getUnsignedByte(buf.readerIndex() + 2 + 2); } if (header == 0x7878 && type == MSG_GPS_LBS_1 && length == 0x24) { variant = Variant.VXT01; } else if (header == 0x7878 && type == MSG_GPS_LBS_STATUS_1 && length == 0x24) { variant = Variant.VXT01; } else if (header == 0x7878 && type == MSG_LBS_MULTIPLE_3 && length == 0x31) { variant = Variant.WANWAY_S20; } else if (header == 0x7878 && type == MSG_LBS_MULTIPLE_3 && length == 0x2e) { variant = Variant.SR411_MINI; } else if (header == 0x7878 && type == MSG_GPS_LBS_1 && length >= 0x71) { variant = Variant.GT06E_CARD; } else if (header == 0x7878 && type == MSG_GPS_LBS_1 && length == 0x21) { variant = Variant.BENWAY; } else if (header == 0x7878 && type == MSG_GPS_LBS_1 && length == 0x2b) { variant = Variant.S5; } else if (header == 0x7878 && type == MSG_LBS_STATUS && length >= 0x17) { variant = Variant.SPACE10X; } else if (header == 0x7878 && type == MSG_STATUS && length == 0x13) { variant = Variant.OBD6; } else if (header == 0x7878 && type == MSG_GPS_LBS_1 && length == 0x29) { variant = Variant.WETRUST; } else if (header == 0x7878 && type == MSG_ALARM && buf.getUnsignedShort(buf.readerIndex() + 4) == 0xffff) { variant = Variant.JC400; } else if (header == 0x7878 && type == MSG_LBS_3 && length == 0x37) { variant = Variant.SL4X; } else if (header == 0x7878 && type == MSG_GPS_LBS_5 && length == 0x2a) { variant = Variant.SL4X; } else if (header == 0x7878 && type == MSG_GPS_LBS_STATUS_4 && length == 0x27) { variant = Variant.SL4X; } else if (header == 0x7878 && type == MSG_GPS_LBS_STATUS_4 && length == 0x29) { variant = Variant.SL4X; } else if (header == 0x7878 && type == MSG_GPS_LBS_2 && length == 0x2f) { variant = Variant.SEEWORLD; } else if (header == 0x7878 && type == MSG_GPS_LBS_STATUS_1 && length == 0x26) { variant = Variant.SEEWORLD; } else if (header == 0x7878 && type == MSG_GPS_LBS_RFID && length == 0x28) { variant = Variant.RFID; } else if (header == 0x7878 && type == MSG_GPS_LBS_STATUS_5 && length == 0x40) { variant = Variant.LW4G; } else { variant = Variant.STANDARD; } } @Override protected Object decode( Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ByteBuf buf = (ByteBuf) msg; decodeVariant(buf); int header = buf.readShort(); if (header == 0x7878) { return decodeBasic(channel, remoteAddress, buf); } else { return decodeExtended(channel, remoteAddress, buf); } } }