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/*
* Copyright 2016 - 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.Log;
import org.traccar.model.Command;
import javax.xml.bind.DatatypeConverter;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
public class EelinkProtocolEncoder extends BaseProtocolEncoder {
private boolean connectionless;
public EelinkProtocolEncoder(boolean connectionless) {
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;
}
private ChannelBuffer encodeContent(long deviceId, String content) {
ChannelBuffer buf = ChannelBuffers.dynamicBuffer();
if (connectionless) {
buf.writeBytes(ChannelBuffers.wrappedBuffer(DatatypeConverter.parseHexBinary('0' + getUniqueId(deviceId))));
}
buf.writeByte(0x67);
buf.writeByte(0x67);
buf.writeByte(EelinkProtocolDecoder.MSG_DOWNLINK);
buf.writeShort(2 + 1 + 4 + content.length()); // length
buf.writeShort(0); // index
buf.writeByte(0x01); // command
buf.writeInt(0); // server id
buf.writeBytes(content.getBytes(StandardCharsets.UTF_8));
ChannelBuffer result = ChannelBuffers.dynamicBuffer();
if (connectionless) {
result.writeByte('E');
result.writeByte('L');
result.writeShort(2 + 2 + 2 + buf.readableBytes()); // length
result.writeShort(checksum(buf.toByteBuffer()));
}
result.writeBytes(buf);
return result;
}
@Override
protected Object encodeCommand(Command command) {
switch (command.getType()) {
case Command.TYPE_CUSTOM:
return encodeContent(command.getDeviceId(), command.getString(Command.KEY_DATA));
case Command.TYPE_POSITION_SINGLE:
return encodeContent(command.getDeviceId(), "WHERE#");
case Command.TYPE_ENGINE_STOP:
return encodeContent(command.getDeviceId(), "RELAY,1#");
case Command.TYPE_ENGINE_RESUME:
return encodeContent(command.getDeviceId(), "RELAY,0#");
case Command.TYPE_REBOOT_DEVICE:
return encodeContent(command.getDeviceId(), "RESET#");
default:
Log.warning(new UnsupportedOperationException(command.getType()));
break;
}
return null;
}
}
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