private void send(Channel channel, String message) {
if (channel != null) {
channel.write(message + Crc.nmeaChecksum(message) + "\r\n");
}
}
@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(2); // header
int type = buf.readUnsignedByte();
buf.readUnsignedShort(); // size
if (type == MSG_ON_DEMAND
|| type == MSG_POSITION_UPLOAD
|| type == MSG_POSITION_REUPLOAD
|| type == MSG_ALARM
|| type == MSG_REPLY
|| type == MSG_PERIPHERAL) {
// Create new position
Position position = new Position();
position.setProtocol(getProtocolName());
// Device identification
if (!identify(readSerialNumber(buf), channel)) {
return null;
}
position.setDeviceId(getDeviceId());
// Date and time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.YEAR, 2000 + ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.MONTH, ChannelBufferTools.readHexInteger(buf, 2) - 1);
time.set(Calendar.DAY_OF_MONTH, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.HOUR_OF_DAY, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.MINUTE, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.SECOND, ChannelBufferTools.readHexInteger(buf, 2));
position.setTime(time.getTime());
// Location
position.setLatitude(ChannelBufferTools.readCoordinate(buf));
position.setLongitude(ChannelBufferTools.readCoordinate(buf));
position.setSpeed(UnitsConverter.knotsFromKph(ChannelBufferTools.readHexInteger(buf, 4)));
position.setCourse(ChannelBufferTools.readHexInteger(buf, 4));
// Flags
int flags = buf.readUnsignedByte();
position.setValid((flags & 0x80) != 0);
if (type == MSG_ALARM) {
buf.skipBytes(2);
} else {
// Odometer
position.set(Event.KEY_ODOMETER, buf.readUnsignedMedium());
// Status
buf.skipBytes(4);
// Other
buf.skipBytes(8);
}
// TODO: parse extra data
return position;
} else if (type == MSG_LOGIN && channel != null) {
buf.skipBytes(4); // serial number
buf.readByte(); // reserved
ChannelBuffer response = ChannelBuffers.dynamicBuffer();
response.writeByte(0x29);
response.writeByte(0x29); // header
response.writeByte(MSG_CONFIRMATION);
response.writeShort(5); // size
response.writeByte(buf.readUnsignedByte());
response.writeByte(type);
response.writeByte(0); // reserved
response.writeByte(Crc.xorChecksum(response.toByteBuffer()));
response.writeByte(0x0D); // ending
channel.write(response);
}
return null;
}
@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel, Object msg) throws Exception {
String sentence = (String) msg;
// Heartbeat
if (sentence.startsWith("$ECHK") && channel != null) {
channel.write(sentence + "\r\n");
return null;
}
// Parse message
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
return null;
}
// Create new position
Position position = new Position();
ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter("laipac");
Integer index = 1;
// Identification
String id = parser.group(index++);
try {
position.setDeviceId(getDataManager().getDeviceByImei(id).getId());
} catch (Exception error) {
Log.warning("Unknown device - " + id);
}
// Time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.HOUR_OF_DAY, Integer.valueOf(parser.group(index++)));
time.set(Calendar.MINUTE, Integer.valueOf(parser.group(index++)));
time.set(Calendar.SECOND, Integer.valueOf(parser.group(index++)));
// Validity
String status = parser.group(index++);
position.setValid(status.compareToIgnoreCase("A") == 0);
// Latitude
Double latitude = Double.valueOf(parser.group(index++));
latitude += Double.valueOf(parser.group(index++)) / 60;
if (parser.group(index++).compareTo("S") == 0) latitude = -latitude;
position.setLatitude(latitude);
// Longitude
Double longitude = Double.valueOf(parser.group(index++));
longitude += Double.valueOf(parser.group(index++)) / 60;
if (parser.group(index++).compareTo("W") == 0) longitude = -longitude;
position.setLongitude(longitude);
// Speed
position.setSpeed(Double.valueOf(parser.group(index++)));
// Course
position.setCourse(Double.valueOf(parser.group(index++)));
// Date
time.set(Calendar.DAY_OF_MONTH, Integer.valueOf(parser.group(index++)));
time.set(Calendar.MONTH, Integer.valueOf(parser.group(index++)) - 1);
time.set(Calendar.YEAR, 2000 + Integer.valueOf(parser.group(index++)));
position.setTime(time.getTime());
// Altitude
position.setAltitude(0.0);
// Response
String type = parser.group(index++);
String checksum = parser.group(index++);
String response = null;
if (type.equals("0") && Character.isLowerCase(status.charAt(0))) {
response = "$EAVACK,0," + checksum;
response += Crc.nmeaChecksum(response);
} else if (type.equals("S") || type.equals("T")) {
response = "$AVCFG,00000000,t*21";
} else if (type.equals("3")) {
response = "$AVCFG,00000000,d*31";
} else if (type.equals("X") || type.equals("4")) {
response = "$AVCFG,00000000,x*2D";
}
if (response != null && channel != null) {
channel.write(response + "\r\n");
}
position.setExtendedInfo(extendedInfo.toString());
return position;
}
