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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.Protocol;
import org.traccar.helper.BcdUtil;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DataConverter;
import org.traccar.helper.DateBuilder;
import org.traccar.model.Position;
import java.net.SocketAddress;
public class MotorProtocolDecoder extends BaseProtocolDecoder {
public MotorProtocolDecoder(Protocol protocol) {
super(protocol);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
String sentence = (String) msg;
ByteBuf buf = Unpooled.wrappedBuffer(DataConverter.parseHex(sentence));
String id = String.format("%08x", buf.readUnsignedIntLE());
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
buf.skipBytes(2); // divider
position.set(Position.KEY_STATUS, buf.readUnsignedShortLE());
buf.skipBytes(2); // divider
buf.readUnsignedMediumLE(); // command
int flags = buf.readUnsignedByte();
position.setValid(BitUtil.check(flags, 7));
if (BitUtil.check(flags, 0)) {
position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
}
position.setLatitude(BcdUtil.readInteger(buf, 2) + BcdUtil.readInteger(buf, 6) * 0.0001 / 60);
position.setLongitude(BcdUtil.readInteger(buf, 4) + BcdUtil.readInteger(buf, 6) * 0.0001 / 60);
position.setSpeed(BcdUtil.readInteger(buf, 4) * 0.1);
position.setCourse(BcdUtil.readInteger(buf, 4) * 0.1);
position.setTime(new DateBuilder()
.setYear(BcdUtil.readInteger(buf, 2))
.setMonth(BcdUtil.readInteger(buf, 2))
.setDay(BcdUtil.readInteger(buf, 2))
.setHour(BcdUtil.readInteger(buf, 2))
.setMinute(BcdUtil.readInteger(buf, 2))
.setSecond(BcdUtil.readInteger(buf, 2)).getDate());
position.set(Position.KEY_RSSI, BcdUtil.readInteger(buf, 2));
return position;
}
}
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