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/*
* Copyright 2016 - 2019 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 org.traccar.BaseProtocolEncoder;
import org.traccar.helper.Checksum;
import org.traccar.helper.DataConverter;
import org.traccar.model.Command;
import org.traccar.Protocol;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import java.nio.charset.StandardCharsets;
public class TeltonikaProtocolEncoder extends BaseProtocolEncoder {
public TeltonikaProtocolEncoder(Protocol protocol) {
super(protocol);
}
private ByteBuf encodeContent(byte[] content) {
ByteBuf buf = Unpooled.buffer();
buf.writeInt(0);
buf.writeInt(content.length + 8);
buf.writeByte(TeltonikaProtocolDecoder.CODEC_12);
buf.writeByte(1); // quantity
buf.writeByte(5); // type
buf.writeInt(content.length);
buf.writeBytes(content);
buf.writeByte(1); // quantity
buf.writeInt(Checksum.crc16(Checksum.CRC16_IBM, buf.nioBuffer(8, buf.writerIndex() - 8)));
return buf;
}
@Override
protected Object encodeCommand(Command command) {
if (command.getType().equals(Command.TYPE_CUSTOM)) {
String data = command.getString(Command.KEY_DATA);
if (data.matches("(\\p{XDigit}{2})+")) {
return encodeContent(DataConverter.parseHex(data));
} else {
return encodeContent((data + "\r\n").getBytes(StandardCharsets.US_ASCII));
}
} else {
return null;
}
}
}
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