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/*
* Copyright 2018 Anton Tananaev (anton@traccar.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.traccar.protocol;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.Checksum;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
public class EgtsProtocolDecoder extends BaseProtocolDecoder {
private static final Logger LOGGER = LoggerFactory.getLogger(EgtsProtocolDecoder.class);
public EgtsProtocolDecoder(Protocol protocol) {
super(protocol);
}
private boolean useOidAsDeviceId = true;
public static final int PT_RESPONSE = 0;
public static final int PT_APPDATA = 1;
public static final int PT_SIGNED_APPDATA = 2;
public static final int SERVICE_AUTH = 1;
public static final int SERVICE_TELEDATA = 2;
public static final int SERVICE_COMMANDS = 4;
public static final int SERVICE_FIRMWARE = 9;
public static final int SERVICE_ECALL = 10;
public static final int MSG_RECORD_RESPONSE = 0;
public static final int MSG_TERM_IDENTITY = 1;
public static final int MSG_MODULE_DATA = 2;
public static final int MSG_VEHICLE_DATA = 3;
public static final int MSG_AUTH_PARAMS = 4;
public static final int MSG_AUTH_INFO = 5;
public static final int MSG_SERVICE_INFO = 6;
public static final int MSG_RESULT_CODE = 7;
public static final int MSG_POS_DATA = 16;
public static final int MSG_EXT_POS_DATA = 17;
public static final int MSG_AD_SENSORS_DATA = 18;
public static final int MSG_COUNTERS_DATA = 19;
public static final int MSG_STATE_DATA = 20;
public static final int MSG_LOOPIN_DATA = 22;
public static final int MSG_ABS_DIG_SENS_DATA = 23;
public static final int MSG_ABS_AN_SENS_DATA = 24;
public static final int MSG_ABS_CNTR_DATA = 25;
public static final int MSG_ABS_LOOPIN_DATA = 26;
public static final int MSG_LIQUID_LEVEL_SENSOR = 27;
public static final int MSG_PASSENGERS_COUNTERS = 28;
private int packetId;
private void sendResponse(
Channel channel, int packetType, int index, int serviceType, int type, ByteBuf content) {
if (channel != null) {
ByteBuf data = Unpooled.buffer();
data.writeByte(type);
data.writeShortLE(content.readableBytes());
data.writeBytes(content);
content.release();
ByteBuf record = Unpooled.buffer();
if (packetType == PT_RESPONSE) {
record.writeShortLE(index);
record.writeByte(0); // success
}
record.writeShortLE(data.readableBytes());
record.writeShortLE(0);
record.writeByte(0); // flags (possibly 1 << 6)
record.writeByte(serviceType);
record.writeByte(serviceType);
record.writeBytes(data);
data.release();
int recordChecksum = Checksum.crc16(Checksum.CRC16_CCITT_FALSE, record.nioBuffer());
ByteBuf response = Unpooled.buffer();
response.writeByte(1); // protocol version
response.writeByte(0); // security key id
response.writeByte(0); // flags
response.writeByte(5 + 2 + 2 + 2); // header length
response.writeByte(0); // encoding
response.writeShortLE(record.readableBytes());
response.writeShortLE(packetId++);
response.writeByte(packetType);
response.writeByte(Checksum.crc8(Checksum.CRC8_EGTS, response.nioBuffer()));
response.writeBytes(record);
record.release();
response.writeShortLE(recordChecksum);
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
List<Position> positions = new LinkedList<>();
// buf possibly contains multiple packets
while (buf.readableBytes() >= 11) {
short headerLength = buf.getUnsignedByte(buf.readerIndex() + 3);
int frameDataLength = buf.getUnsignedShortLE(buf.readerIndex() + 5);
int index = buf.getUnsignedShort(buf.readerIndex() + 5 + 2);
short packetType = buf.getUnsignedByte(buf.readerIndex() + 5 + 2 + 2);
buf.skipBytes(headerLength);
if (packetType == PT_RESPONSE) {
// some retranslator systems do send response on response packets
if (frameDataLength > 0) {
buf.skipBytes(frameDataLength + 2); // 2-byte CRC is present only if frameData exists
}
continue;
}
int frameDataEnd = buf.readerIndex() + frameDataLength;
long oid = 0L;
while (buf.readerIndex() < frameDataEnd) {
int length = buf.readUnsignedShortLE();
int recordIndex = buf.readUnsignedShortLE();
int recordFlags = buf.readUnsignedByte();
if (BitUtil.check(recordFlags, 0)) {
oid = buf.readUnsignedIntLE(); // object id
}
if (BitUtil.check(recordFlags, 1)) {
buf.readUnsignedIntLE(); // event id
}
if (BitUtil.check(recordFlags, 2)) {
buf.readUnsignedIntLE(); // time
}
int serviceType = buf.readUnsignedByte();
buf.readUnsignedByte(); // recipient service type
int recordEnd = buf.readerIndex() + length;
Position position = new Position(getProtocolName());
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession != null) {
position.setDeviceId(deviceSession.getDeviceId());
}
ByteBuf response = Unpooled.buffer();
response.writeShortLE(recordIndex);
response.writeByte(0); // success
sendResponse(channel, PT_RESPONSE, index, serviceType, MSG_RECORD_RESPONSE, response);
while (buf.readerIndex() < recordEnd) {
int type = buf.readUnsignedByte();
int end = buf.readUnsignedShortLE() + buf.readerIndex();
if (type == MSG_TERM_IDENTITY) {
useOidAsDeviceId = false;
buf.readUnsignedIntLE(); // object id
int flags = buf.readUnsignedByte();
if (BitUtil.check(flags, 0)) {
buf.readUnsignedShortLE(); // home dispatcher identifier
}
if (BitUtil.check(flags, 1)) {
String imei = buf.readSlice(15).toString(StandardCharsets.US_ASCII).trim();
LOGGER.trace("[{}] Using IMEI1 as deviceId: {}", channel == null ? "" : channel.id(), imei);
getDeviceSession(channel, remoteAddress, imei);
}
if (BitUtil.check(flags, 2)) {
String imei = buf.readSlice(16).toString(StandardCharsets.US_ASCII).trim();
LOGGER.trace("[{}] Using IMEI2 as deviceId: {}", channel == null ? "" : channel.id(), imei);
getDeviceSession(channel, remoteAddress, imei);
}
if (BitUtil.check(flags, 3)) {
buf.skipBytes(3); // language identifier
}
if (BitUtil.check(flags, 5)) {
buf.skipBytes(3); // network identifier
}
if (BitUtil.check(flags, 6)) {
buf.readUnsignedShortLE(); // buffer size
}
if (BitUtil.check(flags, 7)) {
String imei = buf.readSlice(15).toString(StandardCharsets.US_ASCII).trim();
LOGGER.trace("[{}] Using IMEI7 as deviceId: {}", channel == null ? "" : channel.id(), imei);
getDeviceSession(channel, remoteAddress, imei);
}
response = Unpooled.buffer();
response.writeByte(0); // success
sendResponse(channel, PT_APPDATA, 0, serviceType, MSG_RESULT_CODE, response);
} else if (type == MSG_POS_DATA) {
position.setTime(new Date((buf.readUnsignedIntLE() + 1262304000) * 1000)); // since 2010-01-01
position.setLatitude(buf.readUnsignedIntLE() * 90.0 / 0xFFFFFFFFL);
position.setLongitude(buf.readUnsignedIntLE() * 180.0 / 0xFFFFFFFFL);
int flags = buf.readUnsignedByte();
position.setValid(BitUtil.check(flags, 0));
if (BitUtil.check(flags, 5)) {
position.setLatitude(-position.getLatitude());
}
if (BitUtil.check(flags, 6)) {
position.setLongitude(-position.getLongitude());
}
int speed = buf.readUnsignedShortLE();
position.setSpeed(UnitsConverter.knotsFromKph(BitUtil.to(speed, 14) * 0.1));
position.setCourse(buf.readUnsignedByte() + (BitUtil.check(speed, 15) ? 0x100 : 0));
position.set(Position.KEY_ODOMETER, buf.readUnsignedMediumLE() * 100);
position.set(Position.KEY_INPUT, buf.readUnsignedByte());
position.set(Position.KEY_EVENT, buf.readUnsignedByte());
if (BitUtil.check(flags, 7)) {
position.setAltitude(buf.readMediumLE());
}
} else if (type == MSG_EXT_POS_DATA) {
int flags = buf.readUnsignedByte();
if (BitUtil.check(flags, 0)) {
position.set(Position.KEY_VDOP, buf.readUnsignedShortLE());
}
if (BitUtil.check(flags, 1)) {
position.set(Position.KEY_HDOP, buf.readUnsignedShortLE());
}
if (BitUtil.check(flags, 2)) {
position.set(Position.KEY_PDOP, buf.readUnsignedShortLE());
}
if (BitUtil.check(flags, 3)) {
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
}
} else if (type == MSG_AD_SENSORS_DATA) {
buf.readUnsignedByte(); // inputs flags
position.set(Position.KEY_OUTPUT, buf.readUnsignedByte());
buf.readUnsignedByte(); // adc flags
}
buf.readerIndex(end);
}
if (serviceType == SERVICE_TELEDATA && position.getFixTime() != null) {
if (useOidAsDeviceId && oid != 0L) {
LOGGER.debug("[{}] Using OID as deviceId: {}", channel == null ? "" : channel.id(), oid);
deviceSession = getDeviceSession(channel, remoteAddress, true, String.valueOf(oid));
if (deviceSession != null) {
position.setDeviceId(deviceSession.getDeviceId());
}
}
if (position.getDeviceId() != 0L) {
positions.add(position);
}
}
}
if (frameDataLength > 0) {
buf.readerIndex(frameDataEnd + 2);
}
}
return positions.isEmpty() ? null : positions;
}
}
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