/* * Copyright 2012 Anton Tananaev (anton@traccar.org) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ 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.helper.BitUtil; import org.traccar.helper.DateBuilder; import org.traccar.helper.UnitsConverter; import org.traccar.model.Position; import java.net.SocketAddress; import java.nio.ByteOrder; import java.nio.charset.StandardCharsets; import java.util.LinkedList; import java.util.List; public class NavisProtocolDecoder extends BaseProtocolDecoder { private String prefix; private long deviceUniqueId, serverId; public NavisProtocolDecoder(NavisProtocol protocol) { super(protocol); } public static final int F10 = 0x01; public static final int F20 = 0x02; public static final int F30 = 0x03; public static final int F40 = 0x04; public static final int F50 = 0x05; public static final int F51 = 0x15; public static final int F52 = 0x25; private static boolean isFormat(int type, int... types) { for (int i : types) { if (type == i) { return true; } } return false; } private static final class ParseResult { private final long id; private final Position position; private ParseResult(long id, Position position) { this.id = id; this.position = position; } public long getId() { return id; } public Position getPosition() { return position; } } private ParseResult parsePosition(DeviceSession deviceSession, ChannelBuffer buf) { Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); int format; if (buf.getUnsignedByte(buf.readerIndex()) == 0) { format = buf.readUnsignedShort(); } else { format = buf.readUnsignedByte(); } position.set("format", format); long index = buf.readUnsignedInt(); position.set(Position.KEY_INDEX, index); position.set(Position.KEY_EVENT, buf.readUnsignedShort()); buf.skipBytes(6); // event time short armedStatus = buf.readUnsignedByte(); position.set(Position.KEY_ARMED, armedStatus & 0x7F); if (BitUtil.check(armedStatus, 7)) { position.set(Position.KEY_ALARM, Position.ALARM_GENERAL); } position.set(Position.KEY_STATUS, buf.readUnsignedByte()); position.set(Position.KEY_RSSI, buf.readUnsignedByte()); if (isFormat(format, F10, F20, F30)) { position.set(Position.KEY_OUTPUT, buf.readUnsignedShort()); } else if (isFormat(format, F40, F50, F51, F52)) { position.set(Position.KEY_OUTPUT, buf.readUnsignedByte()); } if (isFormat(format, F10, F20, F30, F40)) { position.set(Position.KEY_INPUT, buf.readUnsignedShort()); } else if (isFormat(format, F50, F51, F52)) { position.set(Position.KEY_INPUT, buf.readUnsignedByte()); } position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.001); position.set(Position.KEY_BATTERY, buf.readUnsignedShort()); if (isFormat(format, F10, F20, F30)) { position.set(Position.PREFIX_TEMP + 1, buf.readShort()); } if (isFormat(format, F10, F20, F50, F52)) { position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShort()); position.set(Position.PREFIX_ADC + 2, buf.readUnsignedShort()); } // Impulse counters if (isFormat(format, F20, F50, F51, F52)) { buf.readUnsignedInt(); buf.readUnsignedInt(); } if (isFormat(format, F20, F50, F51, F52)) { int locationStatus = buf.readUnsignedByte(); position.setValid(BitUtil.check(locationStatus, 1)); DateBuilder dateBuilder = new DateBuilder() .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()) .setDateReverse(buf.readUnsignedByte(), buf.readUnsignedByte() + 1, buf.readUnsignedByte()); position.setTime(dateBuilder.getDate()); position.setLatitude(buf.readFloat() / Math.PI * 180); position.setLongitude(buf.readFloat() / Math.PI * 180); position.setSpeed(UnitsConverter.knotsFromKph(buf.readFloat())); position.setCourse(buf.readUnsignedShort()); position.set(Position.KEY_ODOMETER, buf.readFloat() * 1000); position.set(Position.KEY_DISTANCE, buf.readFloat()); // Segment times buf.readUnsignedShort(); buf.readUnsignedShort(); } // Other if (isFormat(format, F51, F52)) { buf.readUnsignedShort(); buf.readByte(); buf.readUnsignedShort(); buf.readUnsignedShort(); buf.readByte(); buf.readUnsignedShort(); buf.readUnsignedShort(); buf.readByte(); buf.readUnsignedShort(); } // Four temperature sensors if (isFormat(format, F40, F52)) { buf.readByte(); buf.readByte(); buf.readByte(); buf.readByte(); } return new ParseResult(index, position); } private Object processSingle(DeviceSession deviceSession, Channel channel, ChannelBuffer buf) { ParseResult result = parsePosition(deviceSession, buf); ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 8); response.writeBytes(ChannelBuffers.copiedBuffer(ByteOrder.LITTLE_ENDIAN, "*<T", StandardCharsets.US_ASCII)); response.writeInt((int) result.getId()); sendReply(channel, response); if (result.getPosition().getFixTime() == null) { return null; } return result.getPosition(); } private Object processArray(DeviceSession deviceSession, Channel channel, ChannelBuffer buf) { List<Position> positions = new LinkedList<>(); int count = buf.readUnsignedByte(); for (int i = 0; i < count; i++) { Position position = parsePosition(deviceSession, buf).getPosition(); if (position.getFixTime() != null) { positions.add(position); } } ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 8); response.writeBytes(ChannelBuffers.copiedBuffer(ByteOrder.LITTLE_ENDIAN, "*<A", StandardCharsets.US_ASCII)); response.writeByte(count); sendReply(channel, response); if (positions.isEmpty()) { return null; } return positions; } private Object processHandshake(Channel channel, SocketAddress remoteAddress, ChannelBuffer buf) { buf.readByte(); // semicolon symbol if (getDeviceSession(channel, remoteAddress, buf.toString(StandardCharsets.US_ASCII)) != null) { sendReply(channel, ChannelBuffers.copiedBuffer(ByteOrder.LITTLE_ENDIAN, "*<S", StandardCharsets.US_ASCII)); } return null; } private static short checksum(ChannelBuffer buf) { short sum = 0; for (int i = 0; i < buf.readableBytes(); i++) { sum ^= buf.getUnsignedByte(i); } return sum; } private void sendReply(Channel channel, ChannelBuffer data) { ChannelBuffer header = ChannelBuffers.directBuffer(ByteOrder.LITTLE_ENDIAN, 16); header.writeBytes(ChannelBuffers.copiedBuffer(ByteOrder.LITTLE_ENDIAN, prefix, StandardCharsets.US_ASCII)); header.writeInt((int) deviceUniqueId); header.writeInt((int) serverId); header.writeShort(data.readableBytes()); header.writeByte(checksum(data)); header.writeByte(checksum(header)); if (channel != null) { channel.write(ChannelBuffers.copiedBuffer(header, data)); } } @Override protected Object decode( Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ChannelBuffer buf = (ChannelBuffer) msg; prefix = buf.toString(buf.readerIndex(), 4, StandardCharsets.US_ASCII); buf.skipBytes(prefix.length()); // prefix @NTC by default serverId = buf.readUnsignedInt(); deviceUniqueId = buf.readUnsignedInt(); int length = buf.readUnsignedShort(); buf.skipBytes(2); // header and data XOR checksum if (length == 0) { return null; // keep alive message } String type = buf.toString(buf.readerIndex(), 3, StandardCharsets.US_ASCII); buf.skipBytes(type.length()); if (type.equals("*>S")) { return processHandshake(channel, remoteAddress, buf); } else { DeviceSession deviceSession = getDeviceSession(channel, remoteAddress); if (deviceSession != null) { if (type.equals("*>T")) { return processSingle(deviceSession, channel, buf); } else if (type.equals("*>A")) { return processArray(deviceSession, channel, buf); } } } return null; } }