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/*
* Copyright 2016 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.helper.BitUtil;
import org.traccar.helper.Checksum;
import org.traccar.helper.StringFinder;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.ByteOrder;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class GranitProtocolDecoder extends BaseProtocolDecoder {
private static final int HEADER_LENGTH = 6;
public GranitProtocolDecoder(GranitProtocol protocol) {
super(protocol);
}
public static void appendChecksum(ChannelBuffer buffer, int length) {
buffer.writeByte('*');
int checksum = Checksum.xor(buffer.toByteBuffer(0, length)) & 0xFF;
String checksumString = String.format("%02X", checksum);
buffer.writeBytes(checksumString.getBytes(StandardCharsets.US_ASCII));
buffer.writeByte('\r'); buffer.writeByte('\n');
}
private static void sendResponseCurrent(Channel channel, int deviceId, long time) {
ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 0);
response.writeBytes("BB+UGRC~".getBytes(StandardCharsets.US_ASCII));
response.writeShort(6); //binary length
response.writeInt((int) time);
response.writeShort(deviceId);
appendChecksum(response, 16);
channel.write(response);
}
private static void sendResponseArchive(Channel channel, int deviceId, int packNum) {
ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 0);
response.writeBytes("BB+ARCF~".getBytes(StandardCharsets.US_ASCII));
response.writeShort(4); //binary length
response.writeShort(packNum);
response.writeShort(deviceId);
appendChecksum(response, 14);
channel.write(response);
}
private static void decodeStructure(ChannelBuffer buf, Position position) {
short flags = buf.readUnsignedByte();
position.setValid(BitUtil.check(flags, 7));
position.set(Position.KEY_ALARM, BitUtil.check(flags, 1));
short satDel = buf.readUnsignedByte();
position.set(Position.KEY_SATELLITES, BitUtil.from(satDel, 4));
int pdop = BitUtil.to(satDel, 4);
position.set("pdop", pdop);
int lonDegrees = buf.readUnsignedByte();
int latDegrees = buf.readUnsignedByte();
int lonMinutes = buf.readUnsignedShort();
int latMinutes = buf.readUnsignedShort();
double latitude = latDegrees + latMinutes / 60000.0;
double longitude = lonDegrees + lonMinutes / 60000.0;
if (!BitUtil.check(flags, 4)) {
latitude = -latitude;
}
if (!BitUtil.check(flags, 5)) {
longitude = -longitude;
}
position.setLongitude(longitude);
position.setLatitude(latitude);
position.setSpeed(buf.readUnsignedByte());
int course = buf.readUnsignedByte();
if (BitUtil.check(flags, 6)) {
course = course | 0x100;
}
position.setCourse(course);
position.set(Position.KEY_DISTANCE, buf.readShort());
int analogIn1 = buf.readUnsignedByte();
int analogIn2 = buf.readUnsignedByte();
int analogIn3 = buf.readUnsignedByte();
int analogIn4 = buf.readUnsignedByte();
int analogInHi = buf.readUnsignedByte();
analogIn1 = analogInHi << 8 & 0x300 | analogIn1;
analogIn2 = analogInHi << 6 & 0x300 | analogIn2;
analogIn3 = analogInHi << 4 & 0x300 | analogIn3;
analogIn4 = analogInHi << 2 & 0x300 | analogIn4;
position.set(Position.PREFIX_ADC + 1, analogIn1);
position.set(Position.PREFIX_ADC + 2, analogIn2);
position.set(Position.PREFIX_ADC + 3, analogIn3);
position.set(Position.PREFIX_ADC + 4, analogIn4);
position.setAltitude(buf.readUnsignedByte() * 10);
short diOut = buf.readUnsignedByte();
for (int i = 0; i < 8; i++) {
position.set(Position.PREFIX_IO + (i + 1), BitUtil.check(diOut, i));
}
buf.skipBytes(1); //StatMess
}
@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
int indexTilde = buf.indexOf(buf.readerIndex(), buf.writerIndex(), new StringFinder("~"));
if (hasDeviceId() && indexTilde == -1) {
String bufString = buf.toString(StandardCharsets.US_ASCII);
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
position.setTime(new Date());
getLastLocation(position, new Date());
position.setValid(false);
position.set(Position.KEY_RESULT, bufString);
return position;
}
if (buf.readableBytes() < HEADER_LENGTH) {
return null;
}
String header = buf.readBytes(HEADER_LENGTH).toString(StandardCharsets.US_ASCII);
if (header.equals("+RRCB~")) {
buf.skipBytes(2); //binary length 26
int deviceId = buf.readUnsignedShort();
if (!identify(String.valueOf(deviceId), channel, remoteAddress)) {
return null;
}
long unixTime = buf.readUnsignedInt();
if (channel != null) {
sendResponseCurrent(channel, deviceId, unixTime);
}
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
position.setTime(new Date(unixTime * 1000));
decodeStructure(buf, position);
return position;
} else if (header.equals("+DDAT~")) {
buf.skipBytes(2); //binary length
int deviceId = buf.readUnsignedShort();
if (!identify(String.valueOf(deviceId), channel, remoteAddress)) {
return null;
}
byte format = buf.readByte();
if (format != 4) {
return null;
}
byte nblocks = buf.readByte();
int packNum = buf.readUnsignedShort();
if (channel != null) {
sendResponseArchive(channel, deviceId, packNum);
}
List<Position> positions = new ArrayList<>();
while (nblocks > 0) {
nblocks--;
long unixTime = buf.readUnsignedInt();
int timeIncrement = buf.getUnsignedShort(buf.readerIndex() + 120);
for (int i = 0; i < 6; i++) {
if (buf.getUnsignedByte(buf.readerIndex()) != 0xFE) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
position.setTime(new Date((unixTime + i * timeIncrement) * 1000));
decodeStructure(buf, position);
positions.add(position);
} else {
buf.skipBytes(20); // skip filled 0xFE structure
}
}
buf.skipBytes(2); // increment
}
return positions;
}
return null;
}
}
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