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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.model.Position;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import static org.traccar.protocol.Arnavi4FrameDecoder.*;
/**
* Created by Ivan Muratov @binakot on 11.07.2017.
*/
public class Arnavi4ProtocolDecoder extends BaseProtocolDecoder {
private static final byte RECORD_PING = 0x00;
private static final byte RECORD_DATA = 0x01;
private static final byte RECORD_TEXT = 0x03;
private static final byte RECORD_FILE = 0x04;
private static final byte RECORD_BINARY = 0x06;
private static final byte TAG_LATITUDE = 3;
private static final byte TAG_LONGITUDE = 4;
private static final byte TAG_COORD_PARAMS = 5;
public Arnavi4ProtocolDecoder(Arnavi4Protocol protocol) {
super(protocol);
}
private static int modulo256Checksum(byte[] bytes) {
int sum = 0;
for (byte b : bytes) {
sum = (sum + b) & 0xFF;
}
return sum;
}
private Position decodePosition(DeviceSession deviceSession, ChannelBuffer buf, long timestamp) {
final Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(new Date(timestamp));
while (buf.readableBytes() > 0) {
short tagId = buf.readUnsignedByte();
int tagValue = buf.readInt();
switch (tagId) {
case TAG_LATITUDE:
position.setLatitude(Float.intBitsToFloat(tagValue));
position.setValid(true);
break;
case TAG_LONGITUDE:
position.setLongitude(Float.intBitsToFloat(tagValue));
position.setValid(true);
break;
case TAG_COORD_PARAMS:
position.setSpeed((tagValue >> 24) * 1.852);
position.set(Position.KEY_SATELLITES, (tagValue >> 16 & 0x0F) + (tagValue >> 20 & 0x0F));
position.setAltitude((tagValue >> 8 & 0xFF) * 10.0);
position.setCourse((tagValue & 0xFF) * 2.0);
break;
default:
break; // Skip other tags
}
}
return position;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
byte startSign = buf.readByte();
if (startSign == HEADER_START_SIGN) {
byte version = buf.readByte();
String imei = String.valueOf(buf.readLong());
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession != null && channel != null) {
final ChannelBuffer response;
if (version == HEADER_VERSION_1) {
response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 4);
response.writeBytes(new byte[]{0x7B, 0x00, 0x00, 0x7D});
} else if (version == HEADER_VERSION_2) {
response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 9);
response.writeBytes(new byte[]{0x7B, 0x04, 0x00});
byte[] timestampBytes = ByteBuffer.allocate(4).putInt((int) (System.currentTimeMillis() / 1000)).array();
response.writeByte(modulo256Checksum(timestampBytes));
response.writeBytes(timestampBytes);
response.writeByte(0x7D);
} else {
throw new IllegalArgumentException("unsupported header version");
}
channel.write(response);
}
return null;
}
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
if (startSign == PACKAGE_START_SIGN) {
List<Position> positions = new LinkedList<>();
int parcelNumber = buf.readUnsignedByte();
byte recordStartSign = buf.readByte();
while (recordStartSign != PACKAGE_END_SIGN) {
switch (recordStartSign) {
case RECORD_PING:
case RECORD_DATA:
case RECORD_TEXT:
case RECORD_FILE:
case RECORD_BINARY: {
int length = buf.readUnsignedShort();
long timestamp = buf.readUnsignedInt() * 1000;
ChannelBuffer recordBuf = buf.readBytes(length);
if (recordStartSign == RECORD_DATA) {
positions.add(decodePosition(deviceSession, recordBuf, timestamp));
}
buf.readUnsignedByte(); // crc
break;
}
default:
throw new IllegalArgumentException("unsupported record type");
}
recordStartSign = buf.readByte();
}
if (channel != null) {
final ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 4);
response.writeBytes(new byte[]{0x7B, 0x00, (byte) parcelNumber, 0x7D});
channel.write(response);
}
return positions;
}
return null;
}
}
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