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/*
* Copyright 2022 Stefan Clark (stefan@stefanclark.co.uk)
*
* 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;
public class Xexun2ProtocolEncoder extends BaseProtocolEncoder {
public Xexun2ProtocolEncoder(Protocol protocol) {
super(protocol);
}
public static final int FLAG = 0xfaaf;
public static final int MSG_COMMAND = 0x07;
private static ByteBuf encodeFrame(ByteBuf buf) {
int bufLength = buf.readableBytes();
if (bufLength < 5) {
return null;
}
ByteBuf result = Unpooled.buffer();
result.writeBytes(buf.readBytes(2));
while (buf.readerIndex() < bufLength - 2) {
int b = buf.readUnsignedByte();
if (b == 0xfa && buf.isReadable() && buf.getUnsignedByte(buf.readerIndex()) == 0xaf) {
buf.readUnsignedByte();
result.writeByte(0xfb);
result.writeByte(0xbf);
result.writeByte(0x01);
} else if (b == 0xfb && buf.isReadable() && buf.getUnsignedByte(buf.readerIndex()) == 0xbf) {
buf.readUnsignedByte();
result.writeByte(0xfb);
result.writeByte(0xbf);
result.writeByte(0x02);
} else {
result.writeByte(b);
}
}
result.writeBytes(buf.readBytes(2));
return result;
}
private static int udpchecksum(ByteBuf data) {
int sum = 0;
int len = data.capacity();
for (int j = 0; len > 1; len--) {
sum += data.readByte() & 0xff;
if ((sum & 0x80000000) > 0) {
sum = (sum & 0xffff) + (sum >> 16);
}
}
if (len == 1) {
sum += data.readByte() & 0xff;
}
while ((sum >> 16) > 0) {
sum = (sum & 0xffff) + sum >> 16;
}
sum = (sum == 0xffff) ? sum & 0xffff : (~sum) & 0xffff;
return sum;
}
private static ByteBuf encodeContent(String uniqueId, String content) {
ByteBuf buf = Unpooled.buffer();
ByteBuf message = Unpooled.copiedBuffer(content.getBytes());
buf.writeShort(FLAG);
buf.writeShort(MSG_COMMAND);
buf.writeShort(1); // index
buf.writeBytes(DataConverter.parseHex(uniqueId + "0"));
buf.writeShort(message.capacity());
buf.writeShort(udpchecksum(message));
message.resetReaderIndex();
buf.writeBytes(message);
buf.writeShort(FLAG);
return encodeFrame(buf);
}
@Override
protected Object encodeCommand(Command command) {
String uniqueId = getUniqueId(command.getDeviceId());
switch (command.getType()) {
case Command.TYPE_CUSTOM:
return encodeContent(uniqueId, command.getString(Command.KEY_DATA));
case Command.TYPE_POSITION_PERIODIC:
return encodeContent(uniqueId,
String.format("tracking_send=%1$d,%1$d", command.getInteger(Command.KEY_FREQUENCY)));
case Command.TYPE_POWER_OFF:
return encodeContent(uniqueId, "of=1");
case Command.TYPE_REBOOT_DEVICE:
return encodeContent(uniqueId, "reset");
default:
return null;
}
}
}
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