@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
// Find type
Integer index = ChannelBufferTools.find(buf, 0, buf.readableBytes(), ",");
index = ChannelBufferTools.find(buf, index + 1, buf.readableBytes(), ",");
String type = buf.toString(index + 1, 3, Charset.defaultCharset());
if (type.equals("CCC")) {
return decodeBinaryMessage(channel, buf);
} else {
return decodeRegularMessage(channel, buf);
}
}
@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;
}
private Position decodeNormalMessage(
ChannelBuffer buf, Channel channel, SocketAddress remoteAddress) {
Position position = new Position();
position.setProtocol(getProtocolName());
buf.readByte(); // header
String id = String.valueOf(Long.parseLong(ChannelBuffers.hexDump(buf.readBytes(5))));
if (!identify(id, channel, remoteAddress)) {
return null;
}
position.setDeviceId(getDeviceId());
int version = ChannelBufferTools.readHexInteger(buf, 1);
buf.readUnsignedByte(); // type
buf.readBytes(2); // length
DateBuilder dateBuilder =
new DateBuilder()
.setDay(ChannelBufferTools.readHexInteger(buf, 2))
.setMonth(ChannelBufferTools.readHexInteger(buf, 2))
.setYear(ChannelBufferTools.readHexInteger(buf, 2))
.setHour(ChannelBufferTools.readHexInteger(buf, 2))
.setMinute(ChannelBufferTools.readHexInteger(buf, 2))
.setSecond(ChannelBufferTools.readHexInteger(buf, 2));
position.setTime(dateBuilder.getDate());
double latitude = convertCoordinate(ChannelBufferTools.readHexInteger(buf, 8));
double longitude = convertCoordinate(ChannelBufferTools.readHexInteger(buf, 9));
byte flags = buf.readByte();
position.setValid((flags & 0x1) == 0x1);
if ((flags & 0x2) == 0) {
latitude = -latitude;
}
position.setLatitude(latitude);
if ((flags & 0x4) == 0) {
longitude = -longitude;
}
position.setLongitude(longitude);
position.setSpeed(ChannelBufferTools.readHexInteger(buf, 2));
position.setCourse(buf.readUnsignedByte() * 2.0);
if (version == 1) {
position.set(Event.KEY_SATELLITES, buf.readUnsignedByte());
position.set(Event.KEY_POWER, buf.readUnsignedByte());
buf.readByte(); // other flags and sensors
position.setAltitude(buf.readUnsignedShort());
int cid = buf.readUnsignedShort();
int lac = buf.readUnsignedShort();
if (cid != 0 && lac != 0) {
position.set(Event.KEY_CID, cid);
position.set(Event.KEY_LAC, lac);
}
position.set(Event.KEY_GSM, buf.readUnsignedByte());
} else if (version == 2) {
int fuel = buf.readUnsignedByte() << 8;
position.set(Event.KEY_STATUS, buf.readUnsignedInt());
position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
fuel += buf.readUnsignedByte();
position.set(Event.KEY_FUEL, fuel);
}
return position;
}
private List<Position> decodeBinaryMessage(Channel channel, ChannelBuffer buf) {
List<Position> positions = new LinkedList<>();
String flag = buf.toString(2, 1, Charset.defaultCharset());
int index = ChannelBufferTools.find(buf, 0, buf.readableBytes(), ",");
// Identification
String imei = buf.toString(index + 1, 15, Charset.defaultCharset());
if (!identify(imei, channel)) {
return null;
}
buf.skipBytes(index + 1 + 15 + 1 + 3 + 1 + 2 + 2 + 4);
while (buf.readableBytes() >= 0x34) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
// Event
position.set(Event.KEY_EVENT, buf.readUnsignedByte());
// Location
position.setLatitude(buf.readInt() * 0.000001);
position.setLongitude(buf.readInt() * 0.000001);
// Time (946684800 - timestamp for 2000-01-01)
position.setTime(new Date((946684800 + buf.readUnsignedInt()) * 1000));
// Validity
position.setValid(buf.readUnsignedByte() == 1);
// Satellites
position.set(Event.KEY_SATELLITES, buf.readUnsignedByte());
// GSM Signal
position.set(Event.KEY_GSM, buf.readUnsignedByte());
// Speed
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort()));
// Course
position.setCourse(buf.readUnsignedShort());
// HDOP
position.set(Event.KEY_HDOP, buf.readUnsignedShort() * 0.1);
// Altitude
position.setAltitude(buf.readUnsignedShort());
// Other
position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
position.set("runtime", buf.readUnsignedInt());
position.set(
Event.KEY_CELL,
buf.readUnsignedShort()
+ "|"
+ buf.readUnsignedShort()
+ "|"
+ buf.readUnsignedShort()
+ "|"
+ buf.readUnsignedShort());
position.set(Event.KEY_STATUS, buf.readUnsignedShort());
// ADC
position.set(Event.PREFIX_ADC + 1, buf.readUnsignedShort());
position.set(Event.KEY_BATTERY, buf.readUnsignedShort() * 0.01);
position.set(Event.KEY_POWER, buf.readUnsignedShort());
buf.readUnsignedInt(); // geo-fence
positions.add(position);
}
// Delete recorded data
if (channel != null) {
StringBuilder command = new StringBuilder("@@");
command.append(flag).append(27 + positions.size() / 10).append(",");
command.append(imei).append(",CCC,").append(positions.size()).append("*");
int checksum = 0;
for (int i = 0; i < command.length(); i += 1) checksum += command.charAt(i);
command.append(String.format("%02x", checksum & 0xff).toUpperCase());
command.append("\r\n");
channel.write(command.toString());
}
return positions;
}
@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.readUnsignedByte(); // protocol
buf.readUnsignedShort(); // length
int index = buf.readUnsignedByte() >> 3;
if (channel != null) {
ChannelBuffer response = ChannelBuffers.copiedBuffer("^" + index, Charset.defaultCharset());
channel.write(response, remoteAddress);
}
String id = String.valueOf(buf.readUnsignedInt());
if (!identify(id, channel, remoteAddress)) {
return null;
}
List<Position> positions = new LinkedList<>();
while (buf.readableBytes() > 2) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
int end = buf.readerIndex() + buf.readUnsignedByte();
position.setTime(new Date(buf.readUnsignedInt() * 1000));
int flags = buf.readUnsignedByte();
position.set(Event.KEY_SATELLITES, BitUtil.range(flags, 2));
position.setValid(BitUtil.range(flags, 0, 2) > 0);
// Latitude
double lat = buf.readUnsignedMedium();
lat = lat * -180 / 16777216 + 90;
position.setLatitude(lat);
// Longitude
double lon = buf.readUnsignedMedium();
lon = lon * 360 / 16777216 - 180;
position.setLongitude(lon);
// Status
flags = buf.readUnsignedByte();
position.set(Event.KEY_IGNITION, BitUtil.check(flags, 0));
position.set(Event.KEY_GSM, BitUtil.range(flags, 2, 3));
position.setCourse((BitUtil.range(flags, 5) * 45 + 180) % 360);
// Speed
int speed = buf.readUnsignedByte();
if (speed < 250) {
position.setSpeed(UnitsConverter.knotsFromKph(speed));
}
while (buf.readerIndex() < end) {
int type = buf.readUnsignedByte();
int length = buf.readUnsignedByte();
if (length == 255) {
length += buf.readUnsignedByte();
}
switch (type) {
case 2:
position.set(Event.KEY_ODOMETER, buf.readUnsignedMedium());
break;
case 5:
position.set(Event.KEY_INPUT, buf.readUnsignedByte());
break;
case 6:
{
int n = buf.readUnsignedByte() >> 4;
if (n < 2) {
position.set(Event.PREFIX_ADC + n, readSwappedFloat(buf));
} else {
position.set("di" + (n - 2), readSwappedFloat(buf));
}
}
break;
case 7:
{
int alarm = buf.readUnsignedByte();
buf.readUnsignedByte();
if (BitUtil.check(alarm, 5)) {
position.set(Event.KEY_ALARM, BitUtil.range(alarm, 0, 4));
}
}
break;
case 8:
position.set("antihijack", buf.readUnsignedByte());
break;
case 9:
position.set("authorized", ChannelBufferTools.readHexString(buf, 16));
break;
case 10:
position.set("unauthorized", ChannelBufferTools.readHexString(buf, 16));
break;
case 24:
{
Set<Integer> temps = new LinkedHashSet<>();
int temp = buf.readUnsignedByte();
for (int i = 3; i >= 0; i--) {
int n = (temp >> (2 * i)) & 0x03;
if (!temps.contains(n)) {
temps.add(n);
}
}
for (int n : temps) {
position.set(Event.PREFIX_TEMP + n, buf.readUnsignedByte());
}
}
break;
case 28:
position.set("weight", buf.readUnsignedShort());
buf.readUnsignedByte();
break;
case 90:
position.set(Event.KEY_POWER, readSwappedFloat(buf));
break;
case 101:
position.set(Event.KEY_OBD_SPEED, buf.readUnsignedByte());
break;
case 102:
position.set(Event.KEY_RPM, buf.readUnsignedByte() * 50);
break;
case 107:
{
int fuel = buf.readUnsignedShort();
switch (fuel >> 14) {
case 1:
position.set(Event.KEY_FUEL, (fuel & 0x3fff) * 0.4 + "%");
break;
case 2:
position.set(Event.KEY_FUEL, (fuel & 0x3fff) * 0.5 + " l");
break;
case 3:
position.set(Event.KEY_FUEL, (fuel & 0x3fff) * -0.5 + " l");
break;
}
}
break;
case 108:
position.set(Event.KEY_OBD_ODOMETER, buf.readUnsignedInt() * 5);
break;
case 150:
position.set("door", buf.readUnsignedByte());
break;
default:
buf.skipBytes(length);
break;
}
}
positions.add(position);
}
return positions;
}