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/*
* Copyright 2015 Anton Tananaev (anton.tananaev@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 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.Charset;
public class Gt06ProtocolEncoder extends BaseProtocolEncoder {
private ChannelBuffer encodeContent(String content) {
ChannelBuffer buf = ChannelBuffers.dynamicBuffer();
buf.writeByte(0x78);
buf.writeByte(0x78);
buf.writeByte(1 + 1 + 4 + content.length() + 2 + 2); // message length
buf.writeByte(0x80); // message type
buf.writeByte(4 + content.length()); // command length
buf.writeInt(0);
buf.writeBytes(content.getBytes(Charset.defaultCharset())); // command
buf.writeShort(0); // message index
buf.writeShort(Checksum.crc16(Checksum.CRC16_X25, buf.toByteBuffer(2, buf.writerIndex() - 2)));
buf.writeByte('\r');
buf.writeByte('\n');
return buf;
}
@Override
protected Object encodeCommand(Command command) {
switch (command.getType()) {
case Command.TYPE_ENGINE_STOP:
return encodeContent("Relay,1#");
case Command.TYPE_ENGINE_RESUME:
return encodeContent("Relay,0#");
default:
Log.warning(new UnsupportedOperationException(command.getType()));
break;
}
return null;
}
}
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