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/*
* Copyright 2017 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.ByteOrder;
import java.nio.charset.StandardCharsets;
public class GalileoProtocolEncoder extends BaseProtocolEncoder {
private ChannelBuffer encodeText(String uniqueId, String text) {
ChannelBuffer buf = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 256);
buf.writeByte(0x01);
buf.writeShort(uniqueId.length() + text.length() + 11); // TODO
buf.writeByte(0x03); // imei tag
buf.writeBytes(uniqueId.getBytes(StandardCharsets.US_ASCII));
buf.writeByte(0x04); // device id tag
buf.writeShort(0); // not needed if imei provided
buf.writeByte(0xE0); // index tag
buf.writeInt(0); // index
buf.writeByte(0xE1); // command text tag
buf.writeByte(text.length());
buf.writeBytes(text.getBytes(StandardCharsets.US_ASCII));
buf.writeShort(Checksum.crc16(Checksum.CRC16_MODBUS, buf.toByteBuffer(0, buf.writerIndex())));
return buf;
}
@Override
protected Object encodeCommand(Command command) {
switch (command.getType()) {
case Command.TYPE_CUSTOM:
return encodeText(getUniqueId(command.getDeviceId()), command.getString(Command.KEY_DATA));
case Command.TYPE_OUTPUT_CONTROL:
return encodeText(getUniqueId(command.getDeviceId()),
"Out " + command.getInteger(Command.KEY_INDEX) + "," + command.getString(Command.KEY_DATA));
default:
Log.warning(new UnsupportedOperationException(command.getType()));
break;
}
return null;
}
}
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