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/*
* Copyright 2015 - 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 io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import org.traccar.BaseProtocolEncoder;
import org.traccar.Protocol;
import org.traccar.config.Keys;
import org.traccar.helper.Checksum;
import org.traccar.helper.model.AttributeUtil;
import org.traccar.model.Command;
import java.nio.charset.StandardCharsets;
public class Gt06ProtocolEncoder extends BaseProtocolEncoder {
public Gt06ProtocolEncoder(Protocol protocol) {
super(protocol);
}
private ByteBuf encodeContent(long deviceId, String content) {
boolean language = AttributeUtil.lookup(
getCacheManager(), Keys.PROTOCOL_LANGUAGE.withPrefix(getProtocolName()), deviceId);
ByteBuf buf = Unpooled.buffer();
buf.writeByte(0x78);
buf.writeByte(0x78);
buf.writeByte(1 + 1 + 4 + content.length() + 2 + 2 + (language ? 2 : 0)); // message length
buf.writeByte(0x80); // message type
buf.writeByte(4 + content.length()); // command length
buf.writeInt(0);
buf.writeBytes(content.getBytes(StandardCharsets.US_ASCII)); // command
if (language) {
buf.writeShort(2); // english language
}
buf.writeShort(0); // message index
buf.writeShort(Checksum.crc16(Checksum.CRC16_X25, buf.nioBuffer(2, buf.writerIndex() - 2)));
buf.writeByte('\r');
buf.writeByte('\n');
return buf;
}
@Override
protected Object encodeCommand(Command command) {
boolean alternative = AttributeUtil.lookup(
getCacheManager(), Keys.PROTOCOL_ALTERNATIVE.withPrefix(getProtocolName()), command.getDeviceId());
String password = AttributeUtil.getDevicePassword(
getCacheManager(), command.getDeviceId(), getProtocolName(), "123456");
switch (command.getType()) {
case Command.TYPE_ENGINE_STOP:
return encodeContent(command.getDeviceId(),
alternative ? "DYD," + password + "#" : "Relay,1#");
case Command.TYPE_ENGINE_RESUME:
return encodeContent(command.getDeviceId(),
alternative ? "HFYD," + password + "#" : "Relay,0#");
case Command.TYPE_CUSTOM:
return encodeContent(command.getDeviceId(), command.getString(Command.KEY_DATA));
default:
return null;
}
}
}
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