Java tutorial
/* * Copyright 2012 - 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.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.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.Device; 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.HashMap; import java.util.Map; import java.util.TimeZone; import java.util.regex.Pattern; public class Gt06ProtocolDecoder extends BaseProtocolDecoder { private final Map<Integer, ByteBuf> 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_LBS = 0x11; public static final int MSG_GPS_LBS_1 = 0x12; public static final int MSG_GPS_LBS_2 = 0x22; 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_STATUS_2 = 0x26; public static final int MSG_GPS_LBS_STATUS_3 = 0x27; public static final int MSG_LBS_MULTIPLE = 0x28; 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; public static final int MSG_HEARTBEAT = 0x23; public static final int MSG_ADDRESS_REQUEST = 0x2A; public static final int MSG_ADDRESS_RESPONSE = 0x97; public static final int MSG_AZ735_GPS = 0x32; public static final int MSG_AZ735_ALARM = 0x33; 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_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; public static final int MSG_INFO = 0x94; public static final int MSG_STRING_INFO = 0x21; public static final int MSG_GPS_2 = 0xA0; public static final int MSG_LBS_2 = 0xA1; public static final int MSG_WIFI_3 = 0xA2; public static final int MSG_FENCE_SINGLE = 0xA3; public static final int MSG_FENCE_MULTI = 0xA4; public static final int MSG_LBS_ALARM = 0xA5; public static final int MSG_LBS_ADDRESS = 0xA7; public static final int MSG_OBD = 0x8C; public static final int MSG_DTC = 0x65; public static final int MSG_PID = 0x66; 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_STATUS_1: case MSG_GPS_LBS_STATUS_2: case MSG_GPS_LBS_STATUS_3: case MSG_GPS_PHONE: case MSG_GPS_LBS_EXTEND: case MSG_GPS_2: case MSG_FENCE_SINGLE: case MSG_FENCE_MULTI: return true; default: return false; } } private static boolean hasLbs(int type) { switch (type) { case MSG_LBS: case MSG_LBS_STATUS: case MSG_GPS_LBS_1: case MSG_GPS_LBS_2: case MSG_GPS_LBS_STATUS_1: case MSG_GPS_LBS_STATUS_2: case MSG_GPS_LBS_STATUS_3: case MSG_GPS_2: 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: 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: 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'); // ending 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); } private boolean decodeGps(Position position, ByteBuf buf, boolean hasLength, 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; } 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; 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); if (BitUtil.check(flags, 14)) { position.set(Position.KEY_IGNITION, BitUtil.check(flags, 15)); } return true; } private boolean decodeLbs(Position position, ByteBuf buf, boolean hasLength) { int length = 0; if (hasLength) { length = buf.readUnsignedByte(); if (length == 0) { return false; } } int mcc = buf.readUnsignedShort(); int mnc = BitUtil.check(mcc, 15) ? buf.readUnsignedShort() : buf.readUnsignedByte(); position.setNetwork(new Network( CellTower.from(BitUtil.to(mcc, 15), mnc, buf.readUnsignedShort(), buf.readUnsignedMedium()))); if (length > 9) { buf.skipBytes(length - 9); } return true; } private boolean 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_SHOCK); 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 7: position.set(Position.KEY_ALARM, Position.ALARM_REMOVING); break; default: break; } position.set(Position.KEY_BATTERY_LEVEL, buf.readUnsignedByte() * 100 / 6); position.set(Position.KEY_RSSI, buf.readUnsignedByte()); position.set(Position.KEY_ALARM, decodeAlarm(buf.readUnsignedByte())); return true; } private String decodeAlarm(short value) { 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 0x13: return Position.ALARM_TAMPERING; case 0x14: return Position.ALARM_DOOR; case 0x29: return Position.ALARM_ACCELERATION; case 0x30: return Position.ALARM_BRAKING; case 0x2A: case 0x2B: return Position.ALARM_CORNERING; case 0x2C: return Position.ALARM_ACCIDENT; case 0x23: return Position.ALARM_FALL_DOWN; default: return null; } } 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 Position decodeFuelData(Position position, String sentence) { Parser parser = new Parser(PATTERN_FUEL, sentence); 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; } 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 Position decodeLocationString(Position position, String sentence) { Parser parser = new Parser(PATTERN_LOCATION, sentence); if (!parser.matches()) { return null; } 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)); return position; } private Object decodeBasic(Channel channel, SocketAddress remoteAddress, ByteBuf buf) { int length = buf.readUnsignedByte(); int dataLength = length - 5; int type = buf.readUnsignedByte(); DeviceSession deviceSession = null; if (type != MSG_LOGIN) { deviceSession = getDeviceSession(channel, remoteAddress); if (deviceSession == null) { return null; } if (deviceSession.getTimeZone() == null) { deviceSession.setTimeZone(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 && deviceSession.getTimeZone() == null) { deviceSession.setTimeZone(getTimeZone(deviceSession.getDeviceId())); } if (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; } if (deviceSession != null) { TimeZone timeZone = deviceSession.getTimeZone(); if (timeZone.getRawOffset() == 0) { timeZone.setRawOffset(offset * 1000); deviceSession.setTimeZone(timeZone); } } } if (deviceSession != null) { sendResponse(channel, false, type, buf.getShort(buf.writerIndex() - 6), null); } } else if (type == MSG_HEARTBEAT) { Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); 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); } 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); } else if (type == MSG_X1_GPS || type == MSG_X1_PHOTO_INFO) { return decodeX1(channel, buf, deviceSession, type); } else if (type == MSG_WIFI || type == MSG_WIFI_2) { return decodeWifi(channel, buf, deviceSession, type); } else if (type == MSG_INFO) { Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); getLastLocation(position, null); position.set(Position.KEY_POWER, buf.readShort() * 0.01); return position; } else { return decodeBasicOther(channel, buf, deviceSession, type, dataLength); } return null; } private Object decodeX1(Channel channel, ByteBuf buf, DeviceSession deviceSession, int type) { if (type == MSG_X1_GPS) { Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); buf.readUnsignedInt(); // data and alarm decodeGps(position, buf, false, deviceSession.getTimeZone()); 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); 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; } private Object decodeWifi(Channel channel, ByteBuf buf, DeviceSession deviceSession, int type) { Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); 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 = buf.getByte(2); for (int i = 0; i < wifiCount; i++) { String mac = String.format("%02x:%02x:%02x:%02x:%02x:%02x", buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()); network.addWifiAccessPoint(WifiAccessPoint.from(mac, buf.readUnsignedByte())); } 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())); } position.setNetwork(network); 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())); } return position; } private Object decodeBasicOther(Channel channel, ByteBuf buf, DeviceSession deviceSession, int type, int dataLength) { Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); if (type == MSG_LBS_MULTIPLE || type == MSG_LBS_EXTEND || type == MSG_LBS_WIFI || type == MSG_LBS_2 || type == MSG_WIFI_3) { boolean longFormat = type == MSG_LBS_2 || type == MSG_WIFI_3; DateBuilder dateBuilder = new DateBuilder(deviceSession.getTimeZone()) .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()) .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()); getLastLocation(position, dateBuilder.getDate()); int mcc = buf.readUnsignedShort(); int mnc = BitUtil.check(mcc, 15) ? buf.readUnsignedShort() : buf.readUnsignedByte(); Network network = new Network(); for (int i = 0; i < 7; i++) { int lac = longFormat ? buf.readInt() : buf.readUnsignedShort(); int cid = longFormat ? (int) buf.readLong() : buf.readUnsignedMedium(); int rssi = -buf.readUnsignedByte(); if (lac > 0) { network.addCellTower(CellTower.from(BitUtil.to(mcc, 15), mnc, lac, cid, rssi)); } } buf.readUnsignedByte(); // time leads if (type != MSG_LBS_MULTIPLE && type != MSG_LBS_2) { 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.readUnsignedByte(); // server flag (reserved) position.set(Position.KEY_RESULT, buf.readSlice(commandLength - 1).toString(StandardCharsets.US_ASCII)); } } else if (isSupported(type)) { if (hasGps(type)) { decodeGps(position, buf, false, deviceSession.getTimeZone()); } else { getLastLocation(position, null); } if (hasLbs(type)) { decodeLbs(position, buf, hasStatus(type)); } if (hasStatus(type)) { decodeStatus(position, buf); } if (type == MSG_GPS_LBS_1 && buf.readableBytes() == 2 + 6) { 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); } } } if (type == MSG_GPS_LBS_1 && buf.readableBytes() == 4 + 6) { position.set(Position.KEY_ODOMETER, buf.readUnsignedInt()); } if (type == MSG_GPS_LBS_2 && 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); } } 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.getTimeZone() == null) { deviceSession.setTimeZone(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); } if (decodeLocationString(position, data) == null) { 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.KEY_POWER, buf.readUnsignedShort() * 0.01); return position; } else if (subType == 0x05) { 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("iccid", ByteBufUtil.hexDump(buf.readSlice(8))); return position; } else if (subType == 0x0d) { if (buf.getByte(buf.readerIndex()) != '!') { buf.skipBytes(6); } return decodeFuelData(position, buf.toString(buf.readerIndex(), buf.readableBytes() - 4 - 2, StandardCharsets.US_ASCII)); } } 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 { Device device = Context.getDeviceManager().getById(deviceSession.getDeviceId()); position.set(Position.KEY_IMAGE, Context.getMediaManager().writeFile(device.getUniqueId(), photo, "jpg")); photos.remove(pictureId).release(); } } else if (type == MSG_AZ735_GPS || type == MSG_AZ735_ALARM) { if (!decodeGps(position, buf, true, deviceSession.getTimeZone())) { getLastLocation(position, position.getDeviceTime()); } if (decodeLbs(position, buf, 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(deviceSession.getTimeZone()) .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("="); 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; } return null; } @Override protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ByteBuf buf = (ByteBuf) msg; int header = buf.readShort(); if (header == 0x7878) { return decodeBasic(channel, remoteAddress, buf); } else if (header == 0x7979) { return decodeExtended(channel, remoteAddress, buf); } return null; } }