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/*
* Copyright 2015 - 2021 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 org.traccar.BaseProtocolEncoder;
import org.traccar.helper.Checksum;
import org.traccar.model.Command;
import org.traccar.Protocol;
public class KhdProtocolEncoder extends BaseProtocolEncoder {
public static final int MSG_ON_DEMAND_TRACK = 0x30;
public static final int MSG_CUT_OIL = 0x39;
public static final int MSG_RESUME_OIL = 0x38;
public static final int MSG_CHECK_VERSION = 0x3D;
public static final int MSG_FACTORY_RESET = 0xC3;
public static final int MSG_SET_OVERSPEED = 0x3F;
public static final int MSG_DELETE_MILEAGE = 0x66;
public KhdProtocolEncoder(Protocol protocol) {
super(protocol);
}
private ByteBuf encodeCommand(int command, String uniqueId, ByteBuf content) {
ByteBuf buf = Unpooled.buffer();
buf.writeByte(0x29);
buf.writeByte(0x29);
buf.writeByte(command);
int length = 6;
if (content != null) {
length += content.readableBytes();
}
buf.writeShort(length);
uniqueId = "00000000".concat(uniqueId);
uniqueId = uniqueId.substring(uniqueId.length() - 8);
buf.writeByte(Integer.parseInt(uniqueId.substring(0, 2)));
buf.writeByte(Integer.parseInt(uniqueId.substring(2, 4)) + 0x80);
buf.writeByte(Integer.parseInt(uniqueId.substring(4, 6)) + 0x80);
buf.writeByte(Integer.parseInt(uniqueId.substring(6, 8)));
if (content != null) {
buf.writeBytes(content);
}
buf.writeByte(Checksum.xor(buf.nioBuffer()));
buf.writeByte(0x0D); // ending
return buf;
}
@Override
protected Object encodeCommand(Command command) {
String uniqueId = getUniqueId(command.getDeviceId());
return switch (command.getType()) {
case Command.TYPE_ENGINE_STOP -> encodeCommand(MSG_CUT_OIL, uniqueId, null);
case Command.TYPE_ENGINE_RESUME -> encodeCommand(MSG_RESUME_OIL, uniqueId, null);
case Command.TYPE_GET_VERSION -> encodeCommand(MSG_CHECK_VERSION, uniqueId, null);
case Command.TYPE_FACTORY_RESET -> encodeCommand(MSG_FACTORY_RESET, uniqueId, null);
case Command.TYPE_SET_SPEED_LIMIT -> {
ByteBuf content = Unpooled.buffer();
content.writeByte(command.getInteger(Command.KEY_DATA));
yield encodeCommand(MSG_RESUME_OIL, uniqueId, content);
}
case Command.TYPE_SET_ODOMETER -> encodeCommand(MSG_DELETE_MILEAGE, uniqueId, null);
case Command.TYPE_POSITION_SINGLE -> encodeCommand(MSG_ON_DEMAND_TRACK, uniqueId, null);
default -> null;
};
}
}
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