/*
* Copyright 2012 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 java.nio.ByteOrder;
import java.nio.charset.Charset;
import java.util.Calendar;
import java.util.LinkedList;
import java.util.List;
import java.util.Properties;
import java.util.TimeZone;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.database.DataManager;
import org.traccar.helper.Log;
import org.traccar.model.ExtendedInfoFormatter;
import org.traccar.model.Position;
public class NavisProtocolDecoder extends BaseProtocolDecoder {
private String prefix;
private long deviceId, serverId;
private static final Charset charset = Charset.defaultCharset();
private String imei;
private Long databaseDeviceId;
public NavisProtocolDecoder(DataManager dataManager, String protocol, Properties properties) {
super(dataManager, protocol, properties);
}
// Format types
public static final int F10 = 0x01;
public static final int F20 = 0x02;
public static final int F30 = 0x03;
public static final int F40 = 0x04;
public static final int F50 = 0x05;
public static final int F51 = 0x15;
public static final int F52 = 0x25;
private static boolean isFormat(int type, int... types) {
for (int i : types) {
if (type == i) {
return true;
}
}
return false;
}
private class ParseResult {
private long id;
private Position position;
public ParseResult(long id, Position position) {
this.id = id;
this.position = position;
}
public long getId() {
return id;
}
public Position getPosition() {
return position;
}
}
private ParseResult parsePosition(ChannelBuffer buf) {
Position position = new Position();
ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter(getProtocol());
position.setDeviceId(databaseDeviceId);
position.setAltitude(0.0);
// Format type
int format;
if (buf.getUnsignedByte(buf.readerIndex()) == 0) {
format = buf.readUnsignedShort();
} else {
format = buf.readUnsignedByte();
}
extendedInfo.set("format", format);
long index = buf.readUnsignedInt();
extendedInfo.set("index", index);
// Event type
extendedInfo.set("event", buf.readUnsignedShort());
// Event time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.HOUR_OF_DAY, buf.readUnsignedByte());
time.set(Calendar.MINUTE, buf.readUnsignedByte());
time.set(Calendar.SECOND, buf.readUnsignedByte());
time.set(Calendar.DAY_OF_MONTH, buf.readUnsignedByte());
time.set(Calendar.MONTH, buf.readUnsignedByte());
time.set(Calendar.YEAR, 2000 + buf.readUnsignedByte());
extendedInfo.set("time", time.getTimeInMillis());
// Alarm status
extendedInfo.set("alarm", buf.readUnsignedByte());
// Modules status
extendedInfo.set("status", buf.readUnsignedByte());
// GSM signal
extendedInfo.set("gsm", buf.readUnsignedByte());
// Output
if (isFormat(format, F10, F20, F30)) {
extendedInfo.set("output", buf.readUnsignedShort());
} else if (isFormat(format, F40, F50, F51, F52)) {
extendedInfo.set("output", buf.readUnsignedByte());
}
// Input
if (isFormat(format, F10, F20, F30, F40)) {
extendedInfo.set("input", buf.readUnsignedShort());
} else if (isFormat(format, F50, F51, F52)) {
extendedInfo.set("input", buf.readUnsignedByte());
}
extendedInfo.set("power", buf.readUnsignedShort() / 1000.0);
// Battery power
extendedInfo.set("battery", buf.readUnsignedShort());
// Temperature
if (isFormat(format, F10, F20, F30)) {
extendedInfo.set("temperature", buf.readShort());
}
if (isFormat(format, F10, F20, F50, F52)) {
extendedInfo.set("adc1", buf.readUnsignedShort());
extendedInfo.set("adc2", buf.readUnsignedShort());
}
if (isFormat(format, F20, F50, F51, F52)) {
// Impulse counters
buf.readUnsignedInt();
buf.readUnsignedInt();
}
if (isFormat(format, F20, F50, F51, F52)) {
// Validity
int locationStatus = buf.readUnsignedByte();
position.setValid((locationStatus & 0x02) == 0x02);
// Location time
time.clear();
time.set(Calendar.HOUR_OF_DAY, buf.readUnsignedByte());
time.set(Calendar.MINUTE, buf.readUnsignedByte());
time.set(Calendar.SECOND, buf.readUnsignedByte());
time.set(Calendar.DAY_OF_MONTH, buf.readUnsignedByte());
time.set(Calendar.MONTH, buf.readUnsignedByte());
time.set(Calendar.YEAR, 2000 + buf.readUnsignedByte());
position.setTime(time.getTime());
// Location data
position.setLatitude(buf.readFloat() / Math.PI * 180);
position.setLongitude(buf.readFloat() / Math.PI * 180);
position.setSpeed((double) buf.readFloat());
position.setCourse((double) buf.readUnsignedShort());
// Milage
extendedInfo.set("milage", buf.readFloat());
// Last segment
extendedInfo.set("segment", buf.readFloat());
// Segment times
buf.readUnsignedShort();
buf.readUnsignedShort();
}
if (isFormat(format, F51, F52)) {
// Other stuff
buf.readUnsignedShort();
buf.readByte();
buf.readUnsignedShort();
buf.readUnsignedShort();
buf.readByte();
buf.readUnsignedShort();
buf.readUnsignedShort();
buf.readByte();
buf.readUnsignedShort();
}
if (isFormat(format, F40, F52)) {
// Four temperature sensors
buf.readByte();
buf.readByte();
buf.readByte();
buf.readByte();
}
// Extended info
position.setExtendedInfo(extendedInfo.toString());
return new ParseResult(index, position);
}
private Object processSingle(Channel channel, ChannelBuffer buf) {
ParseResult result = parsePosition(buf);
ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 8);
response.writeBytes(ChannelBuffers.copiedBuffer(ByteOrder.LITTLE_ENDIAN, "*<T", charset));
response.writeInt((int) result.getId());
sendReply(channel, response);
// No location data
if (result.getPosition().getValid() == null) {
return null;
}
return result.getPosition();
}
private Object processArray(Channel channel, ChannelBuffer buf) {
List<Position> positions = new LinkedList<Position>();
int count = buf.readUnsignedByte();
for (int i = 0; i < count; i++) {
Position position = parsePosition(buf).getPosition();
if (position.getValid() != null) {
positions.add(position);
}
}
ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 8);
response.writeBytes(ChannelBuffers.copiedBuffer(ByteOrder.LITTLE_ENDIAN, "*<A", charset));
response.writeByte(count);
sendReply(channel, response);
// No location data
if (positions.isEmpty()) {
return null;
}
return positions;
}
private Object processHandshake(Channel channel, ChannelBuffer buf) {
buf.readByte(); // semicolon symbol
imei = buf.toString(Charset.defaultCharset());
try {
databaseDeviceId = getDataManager().getDeviceByImei(imei).getId();
sendReply(channel, ChannelBuffers.copiedBuffer(ByteOrder.LITTLE_ENDIAN, "*<S", charset));
} catch(Exception error) {
Log.warning("Unknown device - " + imei);
}
return null;
}
private static short checksum(ChannelBuffer buf) {
short sum = 0;
for (int i = 0; i < buf.readableBytes(); i++) {
sum ^= buf.getUnsignedByte(i);
}
return sum;
}
private void sendReply(Channel channel, ChannelBuffer data) {
ChannelBuffer header = ChannelBuffers.directBuffer(ByteOrder.LITTLE_ENDIAN, 16);
header.writeBytes(ChannelBuffers.copiedBuffer(ByteOrder.LITTLE_ENDIAN, prefix, charset));
header.writeInt((int) deviceId);
header.writeInt((int) serverId);
header.writeShort(data.readableBytes());
header.writeByte(checksum(data));
header.writeByte(checksum(header));
if (channel != null) {
channel.write(ChannelBuffers.copiedBuffer(header, data));
}
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
// Read header
prefix = buf.toString(buf.readerIndex(), 4, charset);
buf.skipBytes(prefix.length()); // prefix @NTC by default
serverId = buf.readUnsignedInt();
deviceId = buf.readUnsignedInt();
int length = buf.readUnsignedShort();
buf.skipBytes(2); // header and data XOR checksum
if (length == 0) {
return null; // keep alive message
}
// Read message type
String type = buf.toString(buf.readerIndex(), 3, charset);
buf.skipBytes(type.length());
if (type.equals("*>T")) {
return processSingle(channel, buf);
} else if (type.equals("*>A")) {
return processArray(channel, buf);
} else if (type.equals("*>S")) {
return processHandshake(channel, buf);
}
return null;
}
}