@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; }