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/*
* Copyright 2017 - 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.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
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 DmtProtocolDecoder extends BaseProtocolDecoder {
public DmtProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_HELLO = 0x00;
public static final int MSG_HELLO_RESPONSE = 0x01;
public static final int MSG_DATA_RECORD = 0x04;
public static final int MSG_COMMIT = 0x05;
public static final int MSG_COMMIT_RESPONSE = 0x06;
public static final int MSG_DATA_RECORD_64 = 0x10;
public static final int MSG_CANNED_REQUEST_1 = 0x14;
public static final int MSG_CANNED_RESPONSE_1 = 0x15;
public static final int MSG_CANNED_REQUEST_2 = 0x22;
public static final int MSG_CANNED_RESPONSE_2 = 0x23;
private void sendResponse(Channel channel, int type, ByteBuf content) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeByte(0x02); response.writeByte(0x55); // header
response.writeByte(type);
response.writeShortLE(content != null ? content.readableBytes() : 0);
if (content != null) {
response.writeBytes(content);
content.release();
}
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
}
private List<Position> decodeFixed64(Channel channel, SocketAddress remoteAddress, ByteBuf buf) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
List<Position> positions = new LinkedList<>();
while (buf.readableBytes() >= 64) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
buf.readByte(); // type
position.set(Position.KEY_INDEX, buf.readUnsignedIntLE());
long time = buf.readUnsignedIntLE();
position.setTime(new DateBuilder()
.setYear((int) (2000 + (time & 0x3F)))
.setMonth((int) (time >> 6) & 0xF)
.setDay((int) (time >> 10) & 0x1F)
.setHour((int) (time >> 15) & 0x1F)
.setMinute((int) (time >> 20) & 0x3F)
.setSecond((int) (time >> 26) & 0x3F)
.getDate());
position.setLongitude(buf.readIntLE() * 0.0000001);
position.setLatitude(buf.readIntLE() * 0.0000001);
position.setSpeed(UnitsConverter.knotsFromCps(buf.readUnsignedShortLE()));
position.setCourse(buf.readUnsignedByte() * 2);
position.setAltitude(buf.readShortLE());
buf.readUnsignedShortLE(); // position accuracy
buf.readUnsignedByte(); // speed accuracy
position.set(Position.KEY_EVENT, buf.readUnsignedByte());
position.setValid(BitUtil.check(buf.readByte(), 0));
position.set(Position.KEY_INPUT, buf.readUnsignedIntLE());
position.set(Position.KEY_OUTPUT, buf.readUnsignedShortLE());
for (int i = 1; i <= 5; i++) {
position.set(Position.PREFIX_ADC + i, buf.readShortLE());
}
position.set(Position.KEY_DEVICE_TEMP, buf.readByte());
buf.readShortLE(); // accelerometer x
buf.readShortLE(); // accelerometer y
buf.readShortLE(); // accelerometer z
buf.skipBytes(8); // device id
position.set(Position.KEY_PDOP, buf.readUnsignedShortLE() * 0.01);
buf.skipBytes(2); // reserved
buf.readUnsignedShortLE(); // checksum
positions.add(position);
}
return positions;
}
private List<Position> decodeStandard(Channel channel, SocketAddress remoteAddress, ByteBuf buf) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
List<Position> positions = new LinkedList<>();
while (buf.isReadable()) {
int recordEnd = buf.readerIndex() + buf.readUnsignedShortLE();
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.set(Position.KEY_INDEX, buf.readUnsignedIntLE());
position.setDeviceTime(new Date(1356998400000L + buf.readUnsignedIntLE() * 1000)); // since 1 Jan 2013
int event = buf.readUnsignedByte();
position.set(Position.KEY_ALARM, decodeAlarm(event));
position.set(Position.KEY_EVENT, event);
while (buf.readerIndex() < recordEnd) {
int fieldId = buf.readUnsignedByte();
int fieldLength = buf.readUnsignedByte();
int fieldEnd = buf.readerIndex() + (fieldLength == 255 ? buf.readUnsignedShortLE() : fieldLength);
if (fieldId == 0) {
position.setFixTime(new Date(1356998400000L + buf.readUnsignedIntLE() * 1000));
position.setLatitude(buf.readIntLE() * 0.0000001);
position.setLongitude(buf.readIntLE() * 0.0000001);
position.setAltitude(buf.readShortLE());
position.setSpeed(UnitsConverter.knotsFromCps(buf.readUnsignedShortLE()));
buf.readUnsignedByte(); // speed accuracy
position.setCourse(buf.readUnsignedByte() * 2);
position.set(Position.KEY_PDOP, buf.readUnsignedByte() * 0.1);
position.setAccuracy(buf.readUnsignedByte());
position.setValid(buf.readUnsignedByte() != 0);
} else if (fieldId == 2) {
int input = buf.readIntLE();
int output = buf.readUnsignedShortLE();
int status = buf.readUnsignedShortLE();
position.set(Position.KEY_IGNITION, BitUtil.check(input, 0));
if (!BitUtil.check(status, 1)) {
position.set(Position.KEY_ALARM, Position.ALARM_LOW_BATTERY);
} else if (BitUtil.check(status, 6)) {
position.set(Position.KEY_ALARM, Position.ALARM_TAMPERING);
}
position.set(Position.KEY_INPUT, input);
position.set(Position.KEY_OUTPUT, output);
position.set(Position.KEY_STATUS, status);
} else if (fieldId == 6) {
while (buf.readerIndex() < fieldEnd) {
int number = buf.readUnsignedByte();
switch (number) {
case 1 -> position.set(Position.KEY_BATTERY, buf.readUnsignedShortLE() * 0.001);
case 2 -> position.set(Position.KEY_POWER, buf.readUnsignedShortLE() * 0.01);
case 3 -> position.set(Position.KEY_DEVICE_TEMP, buf.readShortLE() * 0.01);
case 4 -> position.set(Position.KEY_RSSI, buf.readUnsignedShortLE());
case 5 -> position.set("solarPower", buf.readUnsignedShortLE() * 0.001);
default -> position.set(Position.PREFIX_IO + number, buf.readUnsignedShortLE());
}
}
} else if (fieldId == 26) {
position.set(Position.KEY_ODOMETER_TRIP, buf.readUnsignedIntLE());
position.set("tripHours", buf.readUnsignedIntLE() * 1000);
} else if (fieldId == 27) {
position.set(Position.KEY_ODOMETER, buf.readUnsignedIntLE());
position.set(Position.KEY_HOURS, buf.readUnsignedIntLE() * 1000);
}
buf.readerIndex(fieldEnd);
}
if (position.getFixTime() == null) {
getLastLocation(position, position.getDeviceTime());
}
positions.add(position);
}
return positions;
}
private String decodeAlarm(int value) {
return switch (value) {
case 12 -> Position.ALARM_BRAKING;
case 13 -> Position.ALARM_ACCELERATION;
case 14 -> Position.ALARM_CORNERING;
case 18 -> Position.ALARM_OVERSPEED;
case 20 -> Position.ALARM_TOW;
case 23 -> Position.ALARM_ACCIDENT;
case 29 -> Position.ALARM_TAMPERING;
case 44 -> Position.ALARM_GEOFENCE_ENTER;
case 45 -> Position.ALARM_GEOFENCE_EXIT;
default -> null;
};
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // header
int type = buf.readUnsignedByte();
int length = buf.readUnsignedShortLE();
if (type == MSG_HELLO) {
buf.readUnsignedIntLE(); // device serial number
DeviceSession deviceSession = getDeviceSession(
channel, remoteAddress, buf.readSlice(15).toString(StandardCharsets.US_ASCII));
ByteBuf response = Unpooled.buffer();
if (length == 51) {
response.writeByte(0); // reserved
response.writeIntLE(0); // reserved
} else {
response.writeIntLE((int) ((System.currentTimeMillis() - 1356998400000L) / 1000));
response.writeIntLE(deviceSession != null ? 0 : 1); // flags
}
sendResponse(channel, MSG_HELLO_RESPONSE, response);
} else if (type == MSG_COMMIT) {
ByteBuf response = Unpooled.buffer(0);
response.writeByte(1); // flags (success)
sendResponse(channel, MSG_COMMIT_RESPONSE, response);
} else if (type == MSG_CANNED_REQUEST_1) {
ByteBuf response = Unpooled.buffer(0);
response.writeBytes(new byte[12]);
sendResponse(channel, MSG_CANNED_RESPONSE_1, response);
} else if (type == MSG_CANNED_REQUEST_2) {
sendResponse(channel, MSG_CANNED_RESPONSE_2, null);
} else if (type == MSG_DATA_RECORD_64) {
return decodeFixed64(channel, remoteAddress, buf);
} else if (type == MSG_DATA_RECORD) {
return decodeStandard(channel, remoteAddress, buf);
}
return null;
}
}
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