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/*
* Copyright 2017 - 2018 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.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
public class RecodaProtocolDecoder extends BaseProtocolDecoder {
public RecodaProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_HEARTBEAT = 0x00001001;
public static final int MSG_REQUEST_RESPONSE = 0x20000001;
public static final int MSG_SIGNAL_LINK_REGISTRATION = 0x20001001;
public static final int MSG_EVENT_NOTICE = 0x20002001;
public static final int MSG_GPS_DATA = 0x20001011;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
int type = buf.readIntLE();
buf.readUnsignedIntLE(); // length
if (type != MSG_HEARTBEAT) {
buf.readUnsignedShortLE(); // version
buf.readUnsignedShortLE(); // index
}
if (type == MSG_SIGNAL_LINK_REGISTRATION) {
getDeviceSession(channel, remoteAddress, buf.readSlice(12).toString(StandardCharsets.US_ASCII));
} else if (type == MSG_GPS_DATA) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(new Date(buf.readLongLE()));
int flags = buf.readUnsignedByte();
if (BitUtil.check(flags, 0)) {
buf.readUnsignedShortLE(); // declination
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShortLE()));
position.setLongitude(buf.readUnsignedByte() + buf.readUnsignedByte() / 60.0);
position.setLatitude(buf.readUnsignedByte() + buf.readUnsignedByte() / 60.0);
position.setLongitude(position.getLongitude() + buf.readUnsignedIntLE() / 3600.0);
position.setLatitude(position.getLatitude() + buf.readUnsignedIntLE() / 3600.0);
int status = buf.readUnsignedByte();
position.setValid(BitUtil.check(status, 0));
if (BitUtil.check(status, 1)) {
position.setLongitude(-position.getLongitude());
}
if (!BitUtil.check(status, 2)) {
position.setLatitude(-position.getLatitude());
}
} else {
getLastLocation(position, position.getDeviceTime());
}
return position;
}
return null;
}
}
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