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/*
* Copyright 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 io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
public class SanulProtocolDecoder extends BaseProtocolDecoder {
public static final int MSG_LOGIN = 0;
public static final int MSG_LOCATION = 1;
public static final int MSG_RESPONSE = 5;
public SanulProtocolDecoder(Protocol protocol) {
super(protocol);
}
private void sendResponse(Channel channel, int type) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeByte(0xaa); // header
response.writeShortLE(0); // reserved
response.writeShortLE(15); // length
response.writeByte(1); // edition
response.writeShortLE(MSG_RESPONSE);
response.writeShortLE(type);
response.writeIntLE(0); // command id
response.writeByte(0); // status
response.writeByte(0); // result length
response.writeIntLE(0); // result data ?
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.readUnsignedByte(); // header
buf.readUnsignedShortLE(); // reserved
buf.readUnsignedShortLE(); // length
buf.readUnsignedByte(); // edition
int type = buf.readUnsignedShortLE();
buf.readUnsignedIntLE(); // command id
sendResponse(channel, type);
if (type == MSG_LOGIN) {
getDeviceSession(channel, remoteAddress, buf.toString(StandardCharsets.US_ASCII).trim());
} else if (type == MSG_LOCATION) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
getLastLocation(position, null);
return position;
}
return null;
}
}
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