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/*
* Copyright 2020 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.ByteBufUtil;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.Protocol;
import org.traccar.helper.DataConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.util.Date;
public class DingtekProtocolDecoder extends BaseProtocolDecoder {
public DingtekProtocolDecoder(Protocol protocol) {
super(protocol);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
String sentence = (String) msg;
int type = Integer.parseInt(sentence.substring(6, 8), 16);
if (type == 0x01 || type == 0x02 || type == 0x04) {
ByteBuf buf = Unpooled.wrappedBuffer(DataConverter.parseHex(sentence));
buf.readUnsignedByte(); // header
buf.readUnsignedByte(); // forced
buf.readUnsignedByte(); // device type
buf.readUnsignedByte(); // type
buf.readUnsignedByte(); // length
String imei = ByteBufUtil.hexDump(buf.slice(buf.writerIndex() - 9, 8)).substring(1);
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(new Date());
position.set("height", buf.readUnsignedShort());
position.setValid(buf.readUnsignedByte() > 0);
position.setLongitude(buf.readFloat());
position.setLatitude(buf.readFloat());
position.set(Position.PREFIX_TEMP + 1, buf.readUnsignedByte());
position.set(Position.KEY_STATUS, buf.readUnsignedInt());
position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.001);
position.set(Position.KEY_RSSI, buf.readFloat());
position.set(Position.KEY_INDEX, buf.readUnsignedShort());
return position;
}
return null;
}
}
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