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/*
* Copyright 2016 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.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.traccar.BaseProtocolEncoder;
import org.traccar.helper.Checksum;
import org.traccar.helper.Log;
import org.traccar.model.Command;
import java.nio.charset.StandardCharsets;
public class TeltonikaProtocolEncoder extends BaseProtocolEncoder {
private ChannelBuffer encodeContent(String content) {
ChannelBuffer buf = ChannelBuffers.dynamicBuffer();
buf.writeInt(0);
buf.writeInt(content.length() + 10);
buf.writeByte(TeltonikaProtocolDecoder.CODEC_12);
buf.writeByte(1); // quantity
buf.writeByte(5); // type
buf.writeInt(content.length() + 2);
buf.writeBytes(content.getBytes(StandardCharsets.US_ASCII));
buf.writeByte('\r');
buf.writeByte('\n');
buf.writeByte(1); // quantity
buf.writeInt(Checksum.crc16(Checksum.CRC16_IBM, buf.toByteBuffer(8, buf.writerIndex() - 8)));
return buf;
}
@Override
protected Object encodeCommand(Command command) {
switch (command.getType()) {
case Command.TYPE_CUSTOM:
return encodeContent((String) command.getAttributes().get(Command.KEY_DATA));
default:
Log.warning(new UnsupportedOperationException(command.getType()));
break;
}
return null;
}
}
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