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/*
* Copyright 2013 Anton Tananaev (anton.tananaev@gmail.com)
*
* 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 org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.helper.Checksum;
import org.traccar.helper.Log;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.ByteOrder;
import java.util.Date;
public class NavigilProtocolDecoder extends BaseProtocolDecoder {
public NavigilProtocolDecoder(NavigilProtocol protocol) {
super(protocol);
}
private static final int LEAP_SECONDS_DELTA = 25;
public static final int MSG_ERROR = 2;
public static final int MSG_INDICATION = 4;
public static final int MSG_CONN_OPEN = 5;
public static final int MSG_CONN_CLOSE = 6;
public static final int MSG_SYSTEM_REPORT = 7;
public static final int MSG_UNIT_REPORT = 8;
public static final int MSG_GEOFENCE_ALARM = 10;
public static final int MSG_INPUT_ALARM = 11;
public static final int MSG_TG2_REPORT = 12;
public static final int MSG_POSITION_REPORT = 13;
public static final int MSG_POSITION_REPORT_2 = 15;
public static final int MSG_SNAPSHOT4 = 17;
public static final int MSG_TRACKING_DATA = 18;
public static final int MSG_MOTION_ALARM = 19;
public static final int MSG_ACKNOWLEDGEMENT = 255;
private static Date convertTimestamp(long timestamp) {
return new Date((timestamp - LEAP_SECONDS_DELTA) * 1000);
}
private int senderSequenceNumber = 1;
private void sendAcknowledgment(Channel channel, int sequenceNumber) {
ChannelBuffer data = ChannelBuffers.directBuffer(ByteOrder.LITTLE_ENDIAN, 4);
data.writeShort(sequenceNumber);
data.writeShort(0); // OK
ChannelBuffer header = ChannelBuffers.directBuffer(ByteOrder.LITTLE_ENDIAN, 20);
header.writeByte(1); header.writeByte(0);
header.writeShort(senderSequenceNumber++);
header.writeShort(MSG_ACKNOWLEDGEMENT);
header.writeShort(header.capacity() + data.capacity());
header.writeShort(0);
header.writeShort(Checksum.crc16(Checksum.CRC16_CCITT_FALSE, data.toByteBuffer()));
header.writeInt(0);
header.writeInt((int) (System.currentTimeMillis() / 1000) + LEAP_SECONDS_DELTA);
if (channel != null) {
channel.write(ChannelBuffers.copiedBuffer(header, data));
}
}
private Position parseUnitReport(
DeviceSession deviceSession, ChannelBuffer buf, int sequenceNumber) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.setValid(true);
position.set(Position.KEY_INDEX, sequenceNumber);
position.setDeviceId(deviceSession.getDeviceId());
buf.readUnsignedShort(); // report trigger
buf.readUnsignedShort(); // flags
position.setLatitude(buf.readInt() * 0.0000001);
position.setLongitude(buf.readInt() * 0.0000001);
position.setAltitude(buf.readUnsignedShort());
buf.readUnsignedShort(); // satellites in fix
buf.readUnsignedShort(); // satellites in track
buf.readUnsignedShort(); // GPS antenna state
position.setSpeed(buf.readUnsignedShort() * 0.194384);
position.setCourse(buf.readUnsignedShort());
buf.readUnsignedInt(); // distance
buf.readUnsignedInt(); // delta distance
position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.001);
buf.readUnsignedShort(); // battery charger status
position.setTime(convertTimestamp(buf.readUnsignedInt()));
return position;
}
private Position parseTg2Report(
DeviceSession deviceSession, ChannelBuffer buf, int sequenceNumber) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.setValid(true);
position.set(Position.KEY_INDEX, sequenceNumber);
position.setDeviceId(deviceSession.getDeviceId());
buf.readUnsignedShort(); // report trigger
buf.readUnsignedByte(); // reserved
buf.readUnsignedByte(); // assisted GPS age
position.setTime(convertTimestamp(buf.readUnsignedInt()));
position.setLatitude(buf.readInt() * 0.0000001);
position.setLongitude(buf.readInt() * 0.0000001);
position.setAltitude(buf.readUnsignedShort());
buf.readUnsignedByte(); // satellites in fix
buf.readUnsignedByte(); // satellites in track
position.setSpeed(buf.readUnsignedShort() * 0.194384);
position.setCourse(buf.readUnsignedShort());
buf.readUnsignedInt(); // distance
buf.readUnsignedShort(); // maximum speed
buf.readUnsignedShort(); // minimum speed
buf.readUnsignedShort(); // VSAUT1 voltage
buf.readUnsignedShort(); // VSAUT2 voltage
buf.readUnsignedShort(); // solar voltage
position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.001);
return position;
}
private Position parsePositionReport(
DeviceSession deviceSession, ChannelBuffer buf, int sequenceNumber, long timestamp) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.set(Position.KEY_INDEX, sequenceNumber);
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(convertTimestamp(timestamp));
position.setLatitude(buf.readMedium() * 0.00002);
position.setLongitude(buf.readMedium() * 0.00002);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
position.setCourse(buf.readUnsignedByte() * 2);
short flags = buf.readUnsignedByte();
position.setValid((flags & 0x80) == 0x80 && (flags & 0x40) == 0x40);
buf.readUnsignedByte(); // reserved
return position;
}
private Position parsePositionReport2(
DeviceSession deviceSession, ChannelBuffer buf, int sequenceNumber, long timestamp) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.set(Position.KEY_INDEX, sequenceNumber);
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(convertTimestamp(timestamp));
position.setLatitude(buf.readInt() * 0.0000001);
position.setLongitude(buf.readInt() * 0.0000001);
buf.readUnsignedByte(); // report trigger
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
short flags = buf.readUnsignedByte();
position.setValid((flags & 0x80) == 0x80 && (flags & 0x40) == 0x40);
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
buf.readUnsignedInt(); // distance
return position;
}
private Position parseSnapshot4(
DeviceSession deviceSession, ChannelBuffer buf, int sequenceNumber) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.set(Position.KEY_INDEX, sequenceNumber);
position.setDeviceId(deviceSession.getDeviceId());
buf.readUnsignedByte(); // report trigger
buf.readUnsignedByte(); // position fix source
buf.readUnsignedByte(); // GNSS fix quality
buf.readUnsignedByte(); // GNSS assistance age
long flags = buf.readUnsignedInt();
position.setValid((flags & 0x0400) == 0x0400);
position.setTime(convertTimestamp(buf.readUnsignedInt()));
position.setLatitude(buf.readInt() * 0.0000001);
position.setLongitude(buf.readInt() * 0.0000001);
position.setAltitude(buf.readUnsignedShort());
buf.readUnsignedByte(); // satellites in fix
buf.readUnsignedByte(); // satellites in track
position.setSpeed(buf.readUnsignedShort() * 0.194384);
position.setCourse(buf.readUnsignedShort() * 0.1);
buf.readUnsignedByte(); // maximum speed
buf.readUnsignedByte(); // minimum speed
buf.readUnsignedInt(); // distance
buf.readUnsignedByte(); // supply voltage 1
buf.readUnsignedByte(); // supply voltage 2
position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.001);
return position;
}
private Position parseTrackingData(
DeviceSession deviceSession, ChannelBuffer buf, int sequenceNumber, long timestamp) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.set(Position.KEY_INDEX, sequenceNumber);
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(convertTimestamp(timestamp));
buf.readUnsignedByte(); // tracking mode
short flags = buf.readUnsignedByte();
position.setValid((flags & 0x01) == 0x01);
buf.readUnsignedShort(); // duration
position.setLatitude(buf.readInt() * 0.0000001);
position.setLongitude(buf.readInt() * 0.0000001);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
position.setCourse(buf.readUnsignedByte() * 2.0);
buf.readUnsignedByte(); // satellites in fix
position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.001);
buf.readUnsignedInt(); // distance
return position;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.readUnsignedByte(); // protocol version
buf.readUnsignedByte(); // version id
int sequenceNumber = buf.readUnsignedShort();
int messageId = buf.readUnsignedShort();
buf.readUnsignedShort(); // length
int flags = buf.readUnsignedShort();
buf.readUnsignedShort(); // checksum
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(buf.readUnsignedInt()));
if (deviceSession == null) {
return null;
}
long timestamp = buf.readUnsignedInt();
if ((flags & 0x1) == 0x0) {
sendAcknowledgment(channel, sequenceNumber);
}
switch (messageId) {
case MSG_UNIT_REPORT:
return parseUnitReport(deviceSession, buf, sequenceNumber);
case MSG_TG2_REPORT:
return parseTg2Report(deviceSession, buf, sequenceNumber);
case MSG_POSITION_REPORT:
return parsePositionReport(deviceSession, buf, sequenceNumber, timestamp);
case MSG_POSITION_REPORT_2:
return parsePositionReport2(deviceSession, buf, sequenceNumber, timestamp);
case MSG_SNAPSHOT4:
return parseSnapshot4(deviceSession, buf, sequenceNumber);
case MSG_TRACKING_DATA:
return parseTrackingData(deviceSession, buf, sequenceNumber, timestamp);
default:
Log.warning(new UnsupportedOperationException(String.valueOf(messageId)));
break;
}
return null;
}
}
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