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/*
* Copyright 2013 - 2022 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;
public class CellocatorProtocolDecoder extends BaseProtocolDecoder {
public CellocatorProtocolDecoder(Protocol protocol) {
super(protocol);
}
static final int MSG_CLIENT_STATUS = 0;
static final int MSG_CLIENT_PROGRAMMING = 3;
static final int MSG_CLIENT_SERIAL_LOG = 7;
static final int MSG_CLIENT_SERIAL = 8;
static final int MSG_CLIENT_MODULAR = 9;
static final int MSG_CLIENT_MODULAR_EXT = 11;
public static final int MSG_SERVER_ACKNOWLEDGE = 4;
public static ByteBuf encodeContent(int type, int uniqueId, int packetNumber, ByteBuf content) {
ByteBuf buf = Unpooled.buffer();
buf.writeByte('M');
buf.writeByte('C');
buf.writeByte('G');
buf.writeByte('P');
buf.writeByte(type);
buf.writeIntLE(uniqueId);
buf.writeByte(packetNumber);
buf.writeIntLE(0); // authentication code
buf.writeBytes(content);
byte checksum = 0;
for (int i = 4; i < buf.writerIndex(); i++) {
checksum += buf.getByte(i);
}
buf.writeByte(checksum);
return buf;
}
private void sendResponse(Channel channel, SocketAddress remoteAddress, long deviceId, byte packetNumber) {
if (channel != null) {
ByteBuf content = Unpooled.buffer();
content.writeByte(0);
content.writeByte(packetNumber);
content.writeZero(11);
ByteBuf reply = encodeContent(MSG_SERVER_ACKNOWLEDGE, (int) deviceId, 0, content);
channel.writeAndFlush(new NetworkMessage(reply, remoteAddress));
}
}
private void sendModuleResponse(Channel channel, SocketAddress remoteAddress, long deviceId, byte packetNumber) {
if (channel != null) {
ByteBuf content = Unpooled.buffer();
content.writeByte(0x80);
content.writeShortLE(10); // modules length
content.writeIntLE(0); // reserved
content.writeByte(9); // ack module type
content.writeShortLE(3); // module length
content.writeByte(0); // ack
content.writeShortLE(0); // reserved
ByteBuf reply = encodeContent(MSG_CLIENT_MODULAR_EXT, (int) deviceId, packetNumber, content);
channel.writeAndFlush(new NetworkMessage(reply, remoteAddress));
}
}
private String decodeAlarm(short reason) {
return switch (reason) {
case 70 -> Position.ALARM_SOS;
case 80 -> Position.ALARM_POWER_CUT;
case 81 -> Position.ALARM_LOW_POWER;
default -> null;
};
}
private Position decodeStatus(ByteBuf buf, DeviceSession deviceSession, boolean alternative) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.set(Position.KEY_VERSION_HW, buf.readUnsignedByte());
position.set(Position.KEY_VERSION_FW, buf.readUnsignedByte());
buf.readUnsignedByte(); // protocol version
position.set(Position.KEY_STATUS, buf.readUnsignedByte() & 0x0f);
buf.readUnsignedByte(); // operator / configuration flags
buf.readUnsignedByte(); // reason data
short event = buf.readUnsignedByte();
position.set(Position.KEY_ALARM, decodeAlarm(event));
position.set(Position.KEY_EVENT, event);
position.set("mode", buf.readUnsignedByte());
long input = buf.readUnsignedInt();
position.set(Position.KEY_IGNITION, BitUtil.check(input, 3 * 8 + 5));
position.set(Position.KEY_DOOR, BitUtil.check(input, 3 * 8));
position.set(Position.KEY_CHARGE, BitUtil.check(input, 7));
position.set(Position.KEY_INPUT, input);
if (alternative) {
buf.readUnsignedByte(); // input
position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShortLE());
position.set(Position.PREFIX_ADC + 2, buf.readUnsignedShortLE());
} else {
buf.readUnsignedByte(); // operator
position.set(Position.PREFIX_ADC + 1, buf.readUnsignedByte());
position.set(Position.PREFIX_ADC + 2, buf.readUnsignedByte());
position.set(Position.PREFIX_ADC + 3, buf.readUnsignedByte());
position.set(Position.PREFIX_ADC + 4, buf.readUnsignedByte());
}
position.set(Position.KEY_ODOMETER, buf.readUnsignedMediumLE());
buf.skipBytes(6); // multi-purpose data
buf.readUnsignedShortLE(); // fix time
buf.readUnsignedByte(); // location status
buf.readUnsignedByte(); // mode 1
buf.readUnsignedByte(); // mode 2
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
position.setValid(true);
if (alternative) {
position.setLongitude(buf.readIntLE() / 10000000.0);
position.setLatitude(buf.readIntLE() / 10000000.0);
} else {
position.setLongitude(buf.readIntLE() / Math.PI * 180 / 100000000);
position.setLatitude(buf.readIntLE() / Math.PI * 180 / 100000000);
}
position.setAltitude(buf.readIntLE() * 0.01);
if (alternative) {
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedIntLE()));
position.setCourse(buf.readUnsignedShortLE() / 1000.0);
} else {
position.setSpeed(UnitsConverter.knotsFromMps(buf.readUnsignedIntLE() * 0.01));
position.setCourse(buf.readUnsignedShortLE() / Math.PI * 180.0 / 1000.0);
}
DateBuilder dateBuilder = new DateBuilder()
.setTimeReverse(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setDateReverse(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedShortLE());
position.setTime(dateBuilder.getDate());
return position;
}
private Position decodeModular(ByteBuf buf, DeviceSession deviceSession) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
buf.readUnsignedByte(); // packet control
buf.readUnsignedShortLE(); // length
buf.readUnsignedShortLE(); // reserved
buf.readUnsignedShortLE(); // reserved
while (buf.readableBytes() > 3) {
int moduleType = buf.readUnsignedByte();
int endIndex = buf.readUnsignedShortLE() + buf.readerIndex();
switch (moduleType) {
case 2:
buf.readUnsignedShortLE(); // operator id
buf.readUnsignedIntLE(); // pl signature
int count = buf.readUnsignedByte();
for (int i = 0; i < count; i++) {
int id = buf.readUnsignedShortLE();
buf.readUnsignedByte(); // variable length
position.set(Position.PREFIX_IO + id, buf.readUnsignedIntLE());
}
break;
case 6:
buf.readUnsignedByte(); // hdop
buf.readUnsignedByte(); // mode 1
buf.readUnsignedByte(); // mode 2
buf.readUnsignedByte(); // satellites
position.setLongitude(buf.readIntLE() / Math.PI * 180 / 100000000);
position.setLatitude(buf.readIntLE() / Math.PI * 180 / 100000000);
position.setAltitude(buf.readIntLE() * 0.01);
position.setSpeed(UnitsConverter.knotsFromMps(buf.readUnsignedByte() * 0.01));
position.setCourse(buf.readUnsignedShortLE() / Math.PI * 180.0 / 1000.0);
break;
case 7:
buf.readUnsignedByte(); // valid
DateBuilder dateBuilder = new DateBuilder()
.setTimeReverse(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setDateReverse(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
position.setTime(dateBuilder.getDate());
break;
default:
break;
}
buf.readerIndex(endIndex);
}
return position;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
boolean alternative = buf.getByte(buf.readerIndex() + 3) != 'P';
buf.skipBytes(4); // system code
int type = buf.readUnsignedByte();
long deviceUniqueId = buf.readUnsignedIntLE();
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(deviceUniqueId));
if (deviceSession == null) {
return null;
}
if (type != MSG_CLIENT_SERIAL) {
buf.readUnsignedShortLE(); // communication control
}
byte packetNumber = buf.readByte();
if (type == MSG_CLIENT_MODULAR_EXT) {
sendModuleResponse(channel, remoteAddress, deviceUniqueId, packetNumber);
} else {
sendResponse(channel, remoteAddress, deviceUniqueId, packetNumber);
}
if (type == MSG_CLIENT_STATUS) {
return decodeStatus(buf, deviceSession, alternative);
} else if (type == MSG_CLIENT_MODULAR_EXT) {
return decodeModular(buf, deviceSession);
}
return null;
}
}
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