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/*
* Copyright 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 org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.Checksum;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.ByteOrder;
import java.nio.charset.StandardCharsets;
import java.util.LinkedList;
import java.util.List;
public class CastelProtocolDecoder extends BaseProtocolDecoder {
public CastelProtocolDecoder(CastelProtocol protocol) {
super(protocol);
}
private static final short MSG_SC_LOGIN = 0x1001;
private static final short MSG_SC_LOGIN_RESPONSE = (short) 0x9001;
private static final short MSG_SC_LOGOUT = 0x1002;
private static final short MSG_SC_HEARTBEAT = 0x1003;
private static final short MSG_SC_HEARTBEAT_RESPONSE = (short) 0x9003;
private static final short MSG_SC_GPS = 0x4001;
private static final short MSG_SC_ALARM = 0x4007;
private static final short MSG_SC_GPS_SLEEP = 0x4009;
private static final short MSG_SC_AGPS_REQUEST = 0x5101;
private static final short MSG_SC_CURRENT_LOCATION = (short) 0xB001;
private static final short MSG_CC_LOGIN = 0x4001;
private static final short MSG_CC_LOGIN_RESPONSE = (short) 0x8001;
private static final short MSG_CC_HEARTBEAT = 0x4206;
private static final short MSG_CC_HEARTBEAT_RESPONSE = (short) 0x8206;
private Position readPosition(ChannelBuffer buf) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
DateBuilder dateBuilder = new DateBuilder()
.setDateReverse(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
position.setTime(dateBuilder.getDate());
double lat = buf.readUnsignedInt() / 3600000.0;
double lon = buf.readUnsignedInt() / 3600000.0;
position.setSpeed(UnitsConverter.knotsFromCps(buf.readUnsignedShort()));
position.setCourse(buf.readUnsignedShort() % 360);
int flags = buf.readUnsignedByte();
if ((flags & 0x02) == 0) {
lat = -lat;
}
if ((flags & 0x01) == 0) {
lon = -lon;
}
position.setLatitude(lat);
position.setLongitude(lon);
position.setValid((flags & 0x0C) > 0);
position.set(Position.KEY_SATELLITES, flags >> 4);
return position;
}
private void sendResponse(
Channel channel, SocketAddress remoteAddress,
int version, ChannelBuffer id, short type, ChannelBuffer content) {
if (channel != null) {
int length = 2 + 2 + 1 + id.readableBytes() + 2 + 2 + 2;
if (content != null) {
length += content.readableBytes();
}
ChannelBuffer response = ChannelBuffers.directBuffer(ByteOrder.LITTLE_ENDIAN, length);
response.writeByte('@'); response.writeByte('@');
response.writeShort(length);
response.writeByte(version);
response.writeBytes(id);
response.writeShort(ChannelBuffers.swapShort(type));
if (content != null) {
response.writeBytes(content);
}
response.writeShort(
Checksum.crc16(Checksum.CRC16_X25, response.toByteBuffer(0, response.writerIndex())));
response.writeByte(0x0D); response.writeByte(0x0A);
channel.write(response, remoteAddress);
}
}
private void sendResponse(
Channel channel, SocketAddress remoteAddress, ChannelBuffer id, short type) {
if (channel != null) {
int length = 2 + 2 + id.readableBytes() + 2 + 4 + 8 + 2 + 2;
ChannelBuffer response = ChannelBuffers.directBuffer(ByteOrder.LITTLE_ENDIAN, length);
response.writeByte('@'); response.writeByte('@');
response.writeShort(length);
response.writeBytes(id);
response.writeShort(ChannelBuffers.swapShort(type));
response.writeInt(0);
for (int i = 0; i < 8; i++) {
response.writeByte(0xff);
}
response.writeShort(
Checksum.crc16(Checksum.CRC16_X25, response.toByteBuffer(0, response.writerIndex())));
response.writeByte(0x0D); response.writeByte(0x0A);
channel.write(response, remoteAddress);
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
int header = buf.readUnsignedShort();
buf.readUnsignedShort(); // length
int version = -1;
if (header == 0x4040) {
version = buf.readUnsignedByte();
}
ChannelBuffer id = buf.readBytes(20);
int type = ChannelBuffers.swapShort(buf.readShort());
if (!identify(id.toString(StandardCharsets.US_ASCII).trim(), channel, remoteAddress)) {
return null;
}
if (version == -1) {
if (type == 0x2001) {
sendResponse(channel, remoteAddress, id, (short) 0x1001);
buf.readUnsignedInt(); // index
buf.readUnsignedInt(); // unix time
buf.readUnsignedByte();
return readPosition(buf);
}
} else if (version == 4) {
if (type == MSG_SC_HEARTBEAT) {
sendResponse(channel, remoteAddress, version, id, MSG_SC_HEARTBEAT_RESPONSE, null);
} else if (type == MSG_SC_LOGIN || type == MSG_SC_LOGOUT || type == MSG_SC_GPS
|| type == MSG_SC_ALARM || type == MSG_SC_CURRENT_LOCATION) {
if (type == MSG_SC_LOGIN) {
ChannelBuffer response = ChannelBuffers.directBuffer(ByteOrder.LITTLE_ENDIAN, 10);
response.writeInt(0xFFFFFFFF);
response.writeShort(0);
response.writeInt((int) (System.currentTimeMillis() / 1000));
sendResponse(channel, remoteAddress, version, id, MSG_SC_LOGIN_RESPONSE, response);
}
if (type == MSG_SC_GPS) {
buf.readUnsignedByte(); // historical
} else if (type == MSG_SC_ALARM) {
buf.readUnsignedInt(); // alarm
} else if (type == MSG_SC_CURRENT_LOCATION) {
buf.readUnsignedShort();
}
buf.readUnsignedInt(); // ACC ON time
buf.readUnsignedInt(); // UTC time
long odometer = buf.readUnsignedInt();
buf.readUnsignedInt(); // trip odometer
buf.readUnsignedInt(); // total fuel consumption
buf.readUnsignedShort(); // current fuel consumption
long status = buf.readUnsignedInt();
buf.skipBytes(8);
int count = buf.readUnsignedByte();
List<Position> positions = new LinkedList<>();
for (int i = 0; i < count; i++) {
Position position = readPosition(buf);
position.set(Position.KEY_ODOMETER, odometer);
position.set(Position.KEY_STATUS, status);
positions.add(position);
}
if (!positions.isEmpty()) {
return positions;
}
} else if (type == MSG_SC_GPS_SLEEP || type == MSG_SC_AGPS_REQUEST) {
return readPosition(buf);
}
} else {
if (type == MSG_CC_HEARTBEAT) {
sendResponse(channel, remoteAddress, version, id, MSG_CC_HEARTBEAT_RESPONSE, null);
buf.readUnsignedByte(); // 0x01 for history
int count = buf.readUnsignedByte();
List<Position> positions = new LinkedList<>();
for (int i = 0; i < count; i++) {
Position position = readPosition(buf);
position.set(Position.KEY_STATUS, buf.readUnsignedInt());
position.set(Position.KEY_BATTERY, buf.readUnsignedByte());
position.set(Position.KEY_ODOMETER, buf.readUnsignedInt());
buf.readUnsignedByte(); // geo-fencing id
buf.readUnsignedByte(); // geo-fencing flags
buf.readUnsignedByte(); // additional flags
position.set(Position.KEY_LAC, buf.readUnsignedShort());
position.set(Position.KEY_CID, buf.readUnsignedShort());
positions.add(position);
}
return positions;
} else if (type == MSG_CC_LOGIN) {
sendResponse(channel, remoteAddress, version, id, MSG_CC_LOGIN_RESPONSE, null);
Position position = readPosition(buf);
position.set(Position.KEY_STATUS, buf.readUnsignedInt());
position.set(Position.KEY_BATTERY, buf.readUnsignedByte());
position.set(Position.KEY_ODOMETER, buf.readUnsignedInt());
buf.readUnsignedByte(); // geo-fencing id
buf.readUnsignedByte(); // geo-fencing flags
buf.readUnsignedByte(); // additional flags
// GSM_CELL_CODE
// STR_Z - firmware version
// STR_Z - hardware version
return position;
}
}
return null;
}
}
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