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/*
* Copyright 2016 - 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.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.NetworkMessage;
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;
public class HuaShengProtocolDecoder extends BaseProtocolDecoder {
public HuaShengProtocolDecoder(HuaShengProtocol protocol) {
super(protocol);
}
public static final int MSG_POSITION = 0xAA00;
public static final int MSG_POSITION_RSP = 0xFF01;
public static final int MSG_LOGIN = 0xAA02;
public static final int MSG_LOGIN_RSP = 0xFF03;
public static final int MSG_HSO_REQ = 0x0002;
public static final int MSG_HSO_RSP = 0x0003;
private void sendResponse(Channel channel, int type, int index, ByteBuf content) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeByte(0xC0);
response.writeShort(0x0100);
response.writeShort(12 + (content != null ? content.readableBytes() : 0));
response.writeShort(type);
response.writeShort(0);
response.writeInt(index);
if (content != null) {
response.writeBytes(content);
}
response.writeByte(0xC0);
channel.write(new NetworkMessage(response, channel.remoteAddress()));
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(1); // start marker
buf.readUnsignedByte(); // flag
buf.readUnsignedByte(); // reserved
buf.readUnsignedShort(); // length
int type = buf.readUnsignedShort();
buf.readUnsignedShort(); // checksum
int index = buf.readInt();
if (type == MSG_LOGIN) {
while (buf.readableBytes() > 4) {
int subtype = buf.readUnsignedShort();
int length = buf.readUnsignedShort() - 4;
if (subtype == 0x0003) {
String imei = buf.readBytes(length).toString(StandardCharsets.US_ASCII);
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession != null && channel != null) {
ByteBuf content = Unpooled.buffer();
content.writeByte(0); // success
sendResponse(channel, MSG_LOGIN_RSP, index, content);
}
} else {
buf.skipBytes(length);
}
}
} else if (type == MSG_HSO_REQ) {
sendResponse(channel, MSG_HSO_RSP, index, null);
} else if (type == MSG_POSITION) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
int status = buf.readUnsignedShort();
position.setValid(BitUtil.check(status, 15));
position.set(Position.KEY_STATUS, status);
position.set(Position.KEY_IGNITION, BitUtil.check(status, 14));
position.set(Position.KEY_EVENT, buf.readUnsignedShort());
String time = buf.readBytes(12).toString(StandardCharsets.US_ASCII);
DateBuilder dateBuilder = new DateBuilder()
.setYear(Integer.parseInt(time.substring(0, 2)))
.setMonth(Integer.parseInt(time.substring(2, 4)))
.setDay(Integer.parseInt(time.substring(4, 6)))
.setHour(Integer.parseInt(time.substring(6, 8)))
.setMinute(Integer.parseInt(time.substring(8, 10)))
.setSecond(Integer.parseInt(time.substring(10, 12)));
position.setTime(dateBuilder.getDate());
position.setLongitude(buf.readInt() * 0.00001);
position.setLatitude(buf.readInt() * 0.00001);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort()));
position.setCourse(buf.readUnsignedShort());
position.setAltitude(buf.readUnsignedShort());
position.set(Position.KEY_ODOMETER, buf.readUnsignedShort() * 1000);
while (buf.readableBytes() > 4) {
buf.readUnsignedShort(); // subtype
int length = buf.readUnsignedShort() - 4;
buf.skipBytes(length);
}
sendResponse(channel, MSG_POSITION_RSP, index, null);
return position;
}
return null;
}
}
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