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/*
* Copyright 2023 Hossain Mohammad Seym (seym45@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 io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import org.traccar.BaseProtocolEncoder;
import org.traccar.Protocol;
import org.traccar.helper.Checksum;
import org.traccar.model.Command;
public class GatorProtocolEncoder extends BaseProtocolEncoder {
public GatorProtocolEncoder(Protocol protocol) {
super(protocol);
}
public ByteBuf encodeId(long deviceId) {
ByteBuf buf = Unpooled.buffer();
String id = getUniqueId(deviceId);
int firstDigit = Integer.parseInt(id.substring(1, 3)) - 30;
buf.writeByte(Integer.parseInt(id.substring(3, 5)) | (((firstDigit >> 3) & 1) << 7));
buf.writeByte(Integer.parseInt(id.substring(5, 7)) | (((firstDigit >> 2) & 1) << 7));
buf.writeByte(Integer.parseInt(id.substring(7, 9)) | (((firstDigit >> 1) & 1) << 7));
buf.writeByte(Integer.parseInt(id.substring(9)) | ((firstDigit & 1) << 7));
return buf;
}
private ByteBuf encodeContent(long deviceId, int type, ByteBuf content) {
ByteBuf buf = Unpooled.buffer();
buf.writeByte(0x24);
buf.writeByte(0x24);
buf.writeByte(type);
buf.writeByte(0x00);
buf.writeByte(4 + 1 + (content != null ? content.readableBytes() : 0) + 1); // length
ByteBuf pseudoIPAddress = encodeId(deviceId);
buf.writeBytes(pseudoIPAddress);
if (content != null) {
buf.writeBytes(content);
}
int checksum = Checksum.xor(buf.nioBuffer());
buf.writeByte(checksum);
buf.writeByte(0x0D);
return buf;
}
@Override
protected Object encodeCommand(Command command) {
ByteBuf content = Unpooled.buffer();
switch (command.getType()) {
case Command.TYPE_POSITION_SINGLE:
return encodeContent(command.getDeviceId(), GatorProtocolDecoder.MSG_POSITION_REQUEST, null);
case Command.TYPE_ENGINE_STOP:
return encodeContent(command.getDeviceId(), GatorProtocolDecoder.MSG_CLOSE_OIL_DUCT, null);
case Command.TYPE_ENGINE_RESUME:
return encodeContent(command.getDeviceId(), GatorProtocolDecoder.MSG_RESTORE_OIL_DUCT, null);
case Command.TYPE_SET_SPEED_LIMIT:
content.writeByte(command.getInteger(Command.KEY_DATA));
return encodeContent(command.getDeviceId(), GatorProtocolDecoder.MSG_RESET_MILEAGE, content);
case Command.TYPE_SET_ODOMETER:
content.writeShort(command.getInteger(Command.KEY_DATA));
return encodeContent(command.getDeviceId(), GatorProtocolDecoder.MSG_OVERSPEED_ALARM, content);
default:
return null;
}
}
}
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