/* * Copyright 2012 Anton Tananaev (anton.tananaev@gmail.com) * * 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 java.net.SocketAddress; import java.nio.ByteOrder; import java.nio.charset.Charset; import java.util.Calendar; import java.util.LinkedList; import java.util.List; import java.util.TimeZone; 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.model.Event; import org.traccar.model.Position; public class NavisProtocolDecoder extends BaseProtocolDecoder { private String prefix; private long deviceUniqueId, serverId; private static final Charset charset = Charset.defaultCharset(); public NavisProtocolDecoder(NavisProtocol protocol) { super(protocol); } // Format types 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 class ParseResult { private final long id; private final Position position; public ParseResult(long id, Position position) { this.id = id; this.position = position; } public long getId() { return id; } public Position getPosition() { return position; } } private ParseResult parsePosition(ChannelBuffer buf) { Position position = new Position(); position.setProtocol(getProtocolName()); position.setDeviceId(getDeviceId()); // Format type 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(Event.KEY_INDEX, index); // Event type position.set(Event.KEY_EVENT, buf.readUnsignedShort()); // Event time Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC")); time.clear(); time.set(Calendar.HOUR_OF_DAY, buf.readUnsignedByte()); time.set(Calendar.MINUTE, buf.readUnsignedByte()); time.set(Calendar.SECOND, buf.readUnsignedByte()); time.set(Calendar.DAY_OF_MONTH, buf.readUnsignedByte()); time.set(Calendar.MONTH, buf.readUnsignedByte()); time.set(Calendar.YEAR, 2000 + buf.readUnsignedByte()); position.set("time", time.getTimeInMillis()); // Alarm status position.set(Event.KEY_ALARM, buf.readUnsignedByte()); // Modules status position.set(Event.KEY_STATUS, buf.readUnsignedByte()); // GSM signal position.set(Event.KEY_GSM, buf.readUnsignedByte()); // Output if (isFormat(format, F10, F20, F30)) { position.set(Event.KEY_OUTPUT, buf.readUnsignedShort()); } else if (isFormat(format, F40, F50, F51, F52)) { position.set(Event.KEY_OUTPUT, buf.readUnsignedByte()); } // Input if (isFormat(format, F10, F20, F30, F40)) { position.set(Event.KEY_INPUT, buf.readUnsignedShort()); } else if (isFormat(format, F50, F51, F52)) { position.set(Event.KEY_INPUT, buf.readUnsignedByte()); } position.set(Event.KEY_POWER, buf.readUnsignedShort() / 1000.0); // Battery power position.set(Event.KEY_BATTERY, buf.readUnsignedShort()); // Temperature if (isFormat(format, F10, F20, F30)) { position.set(Event.PREFIX_TEMP + 1, buf.readShort()); } if (isFormat(format, F10, F20, F50, F52)) { position.set(Event.PREFIX_ADC + 1, buf.readUnsignedShort()); position.set(Event.PREFIX_ADC + 2, buf.readUnsignedShort()); } if (isFormat(format, F20, F50, F51, F52)) { // Impulse counters buf.readUnsignedInt(); buf.readUnsignedInt(); } if (isFormat(format, F20, F50, F51, F52)) { // Validity int locationStatus = buf.readUnsignedByte(); position.setValid((locationStatus & 0x02) == 0x02); // Location time time.clear(); time.set(Calendar.HOUR_OF_DAY, buf.readUnsignedByte()); time.set(Calendar.MINUTE, buf.readUnsignedByte()); time.set(Calendar.SECOND, buf.readUnsignedByte()); time.set(Calendar.DAY_OF_MONTH, buf.readUnsignedByte()); time.set(Calendar.MONTH, buf.readUnsignedByte()); time.set(Calendar.YEAR, 2000 + buf.readUnsignedByte()); position.setTime(time.getTime()); // Location data position.setLatitude(buf.readFloat() / Math.PI * 180); position.setLongitude(buf.readFloat() / Math.PI * 180); position.setSpeed(buf.readFloat()); position.setCourse(buf.readUnsignedShort()); // Odometer position.set(Event.KEY_ODOMETER, buf.readFloat()); // Last segment position.set("segment", buf.readFloat()); // Segment times buf.readUnsignedShort(); buf.readUnsignedShort(); } if (isFormat(format, F51, F52)) { // Other stuff buf.readUnsignedShort(); buf.readByte(); buf.readUnsignedShort(); buf.readUnsignedShort(); buf.readByte(); buf.readUnsignedShort(); buf.readUnsignedShort(); buf.readByte(); buf.readUnsignedShort(); } if (isFormat(format, F40, F52)) { // Four temperature sensors buf.readByte(); buf.readByte(); buf.readByte(); buf.readByte(); } return new ParseResult(index, position); } private Object processSingle(Channel channel, ChannelBuffer buf) { ParseResult result = parsePosition(buf); ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 8); response.writeBytes(ChannelBuffers.copiedBuffer(ByteOrder.LITTLE_ENDIAN, "*<T", charset)); response.writeInt((int) result.getId()); sendReply(channel, response); // No location data if (result.getPosition().getFixTime() == null) { return null; } return result.getPosition(); } private Object processArray(Channel channel, ChannelBuffer buf) { List<Position> positions = new LinkedList<>(); int count = buf.readUnsignedByte(); for (int i = 0; i < count; i++) { Position position = parsePosition(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", charset)); response.writeByte(count); sendReply(channel, response); // No location data if (positions.isEmpty()) { return null; } return positions; } private Object processHandshake(Channel channel, ChannelBuffer buf) { buf.readByte(); // semicolon symbol if (identify(buf.toString(Charset.defaultCharset()), channel)) { sendReply(channel, ChannelBuffers.copiedBuffer(ByteOrder.LITTLE_ENDIAN, "*<S", charset)); } 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, charset)); 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; // Read header prefix = buf.toString(buf.readerIndex(), 4, charset); 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 } // Read message type String type = buf.toString(buf.readerIndex(), 3, charset); buf.skipBytes(type.length()); switch (type) { case "*>T": return processSingle(channel, buf); case "*>A": return processArray(channel, buf); case "*>S": return processHandshake(channel, buf); } return null; } }