/* * Copyright 2012 - 2015 Anton Tananaev (anton.tananaev@gmail.com) * * 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 java.net.SocketAddress; import java.util.TimeZone; import org.jboss.netty.buffer.ChannelBuffer; import org.jboss.netty.buffer.ChannelBuffers; import org.jboss.netty.channel.Channel; import org.traccar.BaseProtocolDecoder; import org.traccar.Context; import org.traccar.helper.BitUtil; import org.traccar.helper.Checksum; import org.traccar.helper.DateBuilder; import org.traccar.helper.UnitsConverter; import org.traccar.model.Event; import org.traccar.model.Position; public class Gt06ProtocolDecoder extends BaseProtocolDecoder { private boolean forceTimeZone = false; private final TimeZone timeZone = TimeZone.getTimeZone("UTC"); public Gt06ProtocolDecoder(Gt06Protocol protocol) { super(protocol); if (Context.getConfig().hasKey(getProtocolName() + ".timezone")) { forceTimeZone = true; timeZone.setRawOffset(Context.getConfig().getInteger(getProtocolName() + ".timezone") * 1000); } } 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_GPS_LBS_STATUS_2 = 0x26; public static final int MSG_GPS_LBS_STATUS_3 = 0x27; public static final int MSG_LBS_PHONE = 0x17; 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_COMMAND_0 = 0x80; public static final int MSG_COMMAND_1 = 0x81; public static final int MSG_COMMAND_2 = 0x82; private static boolean isSupported(int type) { return hasGps(type) || hasLbs(type) || hasStatus(type); } private static boolean hasGps(int type) { return type == MSG_GPS || type == MSG_GPS_LBS_1 || type == MSG_GPS_LBS_2 || type == MSG_GPS_LBS_STATUS_1 || type == MSG_GPS_LBS_STATUS_2 || type == MSG_GPS_LBS_STATUS_3 || type == MSG_GPS_PHONE || type == MSG_GPS_LBS_EXTEND; } private static boolean hasLbs(int type) { return type == MSG_LBS || type == MSG_LBS_STATUS || type == MSG_GPS_LBS_1 || type == MSG_GPS_LBS_2 || type == MSG_GPS_LBS_STATUS_1 || type == MSG_GPS_LBS_STATUS_2 || type == MSG_GPS_LBS_STATUS_3; } private static boolean hasStatus(int type) { return type == MSG_STATUS || type == MSG_LBS_STATUS || type == MSG_GPS_LBS_STATUS_1 || type == MSG_GPS_LBS_STATUS_2 || type == MSG_GPS_LBS_STATUS_3; } private static void sendResponse(Channel channel, int type, int index) { if (channel != null) { ChannelBuffer response = ChannelBuffers.directBuffer(10); response.writeByte(0x78); response.writeByte(0x78); // header response.writeByte(0x05); // size response.writeByte(type); response.writeShort(index); response.writeShort(Checksum.crc16(Checksum.CRC16_X25, response.toByteBuffer(2, 4))); response.writeByte(0x0D); response.writeByte(0x0A); // ending channel.write(response); } } private void decodeGps(Position position, ChannelBuffer buf) { DateBuilder dateBuilder = new DateBuilder(timeZone) .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()) .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()); position.setTime(dateBuilder.getDate()); int length = buf.readUnsignedByte(); position.set(Event.KEY_SATELLITES, BitUtil.to(length, 4)); length = BitUtil.from(length, 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(Event.KEY_IGNITION, BitUtil.check(flags, 15)); } buf.skipBytes(length - 12); // skip reserved } private void decodeLbs(Position position, ChannelBuffer buf, boolean hasLength) { int lbsLength = 0; if (hasLength) { lbsLength = buf.readUnsignedByte(); } position.set(Event.KEY_MCC, buf.readUnsignedShort()); position.set(Event.KEY_MNC, buf.readUnsignedByte()); position.set(Event.KEY_LAC, buf.readUnsignedShort()); position.set(Event.KEY_CID, buf.readUnsignedMedium()); if (lbsLength > 0) { buf.skipBytes(lbsLength - 9); } } private void decodeStatus(Position position, ChannelBuffer buf) { position.set(Event.KEY_ALARM, true); int flags = buf.readUnsignedByte(); position.set(Event.KEY_IGNITION, BitUtil.check(flags, 1)); // decode other flags position.set(Event.KEY_POWER, buf.readUnsignedByte()); position.set(Event.KEY_GSM, buf.readUnsignedByte()); } @Override protected Object decode( Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ChannelBuffer buf = (ChannelBuffer) msg; if (buf.readByte() != 0x78 || buf.readByte() != 0x78) { return null; } int length = buf.readUnsignedByte(); // size int dataLength = length - 5; int type = buf.readUnsignedByte(); if (type == MSG_LOGIN) { String imei = ChannelBuffers.hexDump(buf.readBytes(8)).substring(1); buf.readUnsignedShort(); // type // Timezone offset 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 (!forceTimeZone) { timeZone.setRawOffset(offset * 1000); } } if (identify(imei, channel, remoteAddress)) { buf.skipBytes(buf.readableBytes() - 6); sendResponse(channel, type, buf.readUnsignedShort()); } } else if (hasDeviceId()) { if (isSupported(type)) { Position position = new Position(); position.setDeviceId(getDeviceId()); position.setProtocol(getProtocolName()); if (hasGps(type)) { decodeGps(position, buf); } 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() == 4 + 6) { position.set(Event.KEY_ODOMETER, buf.readUnsignedInt()); } if (buf.readableBytes() > 6) { buf.skipBytes(buf.readableBytes() - 6); } int index = buf.readUnsignedShort(); position.set(Event.KEY_INDEX, index); sendResponse(channel, type, index); return position; } else { buf.skipBytes(dataLength); if (type != MSG_COMMAND_0 && type != MSG_COMMAND_1 && type != MSG_COMMAND_2) { sendResponse(channel, type, buf.readUnsignedShort()); } } } return null; } }