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/*
* Copyright 2016 - 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.helper.DataConverter;
import org.traccar.model.Command;
import org.traccar.Protocol;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
public class EelinkProtocolEncoder extends BaseProtocolEncoder {
private boolean connectionless;
public EelinkProtocolEncoder(Protocol protocol, boolean connectionless) {
super(protocol);
this.connectionless = connectionless;
}
public static int checksum(ByteBuffer buf) {
int sum = 0;
while (buf.hasRemaining()) {
sum = (((sum << 1) | (sum >> 15)) + (buf.get() & 0xFF)) & 0xFFFF;
}
return sum;
}
public static ByteBuf encodeContent(
boolean connectionless, String uniqueId, int type, int index, ByteBuf content) {
ByteBuf buf = Unpooled.buffer();
if (connectionless) {
buf.writeBytes(DataConverter.parseHex('0' + uniqueId));
}
buf.writeByte(0x67);
buf.writeByte(0x67);
buf.writeByte(type);
buf.writeShort(2 + (content != null ? content.readableBytes() : 0)); // length
buf.writeShort(index);
if (content != null) {
buf.writeBytes(content);
}
ByteBuf result = Unpooled.buffer();
if (connectionless) {
result.writeByte('E');
result.writeByte('L');
result.writeShort(2 + buf.readableBytes()); // length
result.writeShort(checksum(buf.nioBuffer()));
}
result.writeBytes(buf);
buf.release();
return result;
}
private ByteBuf encodeContent(long deviceId, String content) {
ByteBuf buf = Unpooled.buffer();
buf.writeByte(0x01); // command
buf.writeInt(0); // server id
buf.writeBytes(content.getBytes(StandardCharsets.UTF_8));
return encodeContent(connectionless, getUniqueId(deviceId), EelinkProtocolDecoder.MSG_DOWNLINK, 0, buf);
}
@Override
protected Object encodeCommand(Command command) {
return switch (command.getType()) {
case Command.TYPE_CUSTOM -> encodeContent(command.getDeviceId(), command.getString(Command.KEY_DATA));
case Command.TYPE_POSITION_SINGLE -> encodeContent(command.getDeviceId(), "WHERE#");
case Command.TYPE_ENGINE_STOP -> encodeContent(command.getDeviceId(), "RELAY,1#");
case Command.TYPE_ENGINE_RESUME -> encodeContent(command.getDeviceId(), "RELAY,0#");
case Command.TYPE_REBOOT_DEVICE -> encodeContent(command.getDeviceId(), "RESET#");
default -> null;
};
}
}
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