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/*
* Copyright 2017 - 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.model.Command;
import org.traccar.Protocol;
public class CellocatorProtocolEncoder extends BaseProtocolEncoder {
public CellocatorProtocolEncoder(Protocol protocol) {
super(protocol);
}
public static ByteBuf encodeContent(int type, int uniqueId, int packetNumber, ByteBuf content) {
ByteBuf buf = Unpooled.buffer();
buf.writeByte('M');
buf.writeByte('C');
buf.writeByte('G');
buf.writeByte('P');
buf.writeByte(type);
buf.writeIntLE(uniqueId);
buf.writeByte(packetNumber);
buf.writeIntLE(0); // authentication code
buf.writeBytes(content);
byte checksum = 0;
for (int i = 4; i < buf.writerIndex(); i++) {
checksum += buf.getByte(i);
}
buf.writeByte(checksum);
return buf;
}
private ByteBuf encodeCommand(long deviceId, int command, int data1, int data2) {
ByteBuf content = Unpooled.buffer();
content.writeByte(command);
content.writeByte(command);
content.writeByte(data1);
content.writeByte(data1);
content.writeByte(data2);
content.writeByte(data2);
content.writeIntLE(0); // command specific data
ByteBuf buf = encodeContent(0, Integer.parseInt(getUniqueId(deviceId)), 0, content);
content.release();
return buf;
}
@Override
protected Object encodeCommand(Command command) {
if (command.getType().equals(Command.TYPE_OUTPUT_CONTROL)) {
int data = Integer.parseInt(command.getString(Command.KEY_DATA)) << 4
+ command.getInteger(Command.KEY_INDEX);
return encodeCommand(command.getDeviceId(), 0x03, data, 0);
}
return null;
}
}
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