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; }