/* * Copyright 2013 - 2014 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.charset.Charset; import java.util.Date; import java.util.LinkedList; import java.util.List; 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.helper.UnitsConverter; import org.traccar.model.Event; import org.traccar.model.Position; public class AtrackProtocolDecoder extends BaseProtocolDecoder { public AtrackProtocolDecoder(AtrackProtocol protocol) { super(protocol); } private static final int MIN_DATA_LENGTH = 40; private static void sendResponse(Channel channel, SocketAddress remoteAddress, long rawId, int index) { if (channel != null) { ChannelBuffer response = ChannelBuffers.directBuffer(12); response.writeShort(0xfe02); response.writeLong(rawId); response.writeShort(index); channel.write(response, remoteAddress); } } private static String readString(ChannelBuffer buf) { String result = null; int length = 0; while (buf.getByte(buf.readerIndex() + length) != 0) { length += 1; } if (length != 0) { result = buf.toString(buf.readerIndex(), length, Charset.defaultCharset()); buf.skipBytes(length); } buf.readByte(); return result; } @Override protected Object decode( Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ChannelBuffer buf = (ChannelBuffer) msg; // Keep alive message if (buf.getUnsignedShort(buf.readerIndex()) == 0xfe02) { if (channel != null) { channel.write(buf, remoteAddress); } return null; } buf.skipBytes(2); // prefix buf.readUnsignedShort(); // checksum buf.readUnsignedShort(); // length int index = buf.readUnsignedShort(); // Get device id long id = buf.readLong(); if (!identify(String.valueOf(id), channel, remoteAddress)) { return null; } // Send acknowledgement sendResponse(channel, remoteAddress, id, index); List<Position> positions = new LinkedList<>(); while (buf.readableBytes() >= MIN_DATA_LENGTH) { // Create new position Position position = new Position(); position.setDeviceId(getDeviceId()); position.setProtocol(getProtocolName()); // Date and time position.setTime(new Date(buf.readUnsignedInt() * 1000)); // gps time buf.readUnsignedInt(); // rtc time buf.readUnsignedInt(); // send time // Coordinates position.setValid(true); position.setLongitude(buf.readInt() * 0.000001); position.setLatitude(buf.readInt() * 0.000001); // Course position.setCourse(buf.readUnsignedShort()); // Report type position.set(Event.KEY_TYPE, buf.readUnsignedByte()); // Odometer position.set(Event.KEY_ODOMETER, buf.readUnsignedInt() * 0.1); // Accuracy position.set(Event.KEY_HDOP, buf.readUnsignedShort() * 0.1); // Input position.set(Event.KEY_INPUT, buf.readUnsignedByte()); // Speed position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort())); // Output position.set(Event.KEY_OUTPUT, buf.readUnsignedByte()); // ADC position.set(Event.PREFIX_ADC + 1, buf.readUnsignedShort() * 0.001); // Driver position.set("driver", readString(buf)); // Temperature position.set(Event.PREFIX_TEMP + 1, buf.readShort() * 0.1); position.set(Event.PREFIX_TEMP + 2, buf.readShort() * 0.1); // Text Message position.set("message", readString(buf)); // With AT$FORM Command you can extend atrack protocol. // For example adding AT$FORM %FC /Fuel used you can add the line in this position: // position.set("fuelused", buf.readUnsignedInt() * 0.1); positions.add(position); } return positions; } }