/* * Copyright 2012 Alex Wilson <alex@uq.edu.au> * * 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.util.Calendar; import java.util.TimeZone; import java.util.regex.Matcher; import java.util.regex.Pattern; import org.jboss.netty.channel.Channel; import org.jboss.netty.channel.ChannelHandlerContext; import org.traccar.BaseProtocolDecoder; import org.traccar.model.Position; /** * Maxon Datamax GPS send protocol (NMEA + GPFID) * As seen in the MA100-1010 router * * It sends its identity after the GPRMC sentence, and with the type * GPFID. */ public class MaxonProtocolDecoder extends BaseProtocolDecoder { private Position position = null; public MaxonProtocolDecoder(MaxonProtocol protocol) { super(protocol); } static private Pattern pattern = Pattern.compile( "\\$GPRMC," + "(\\d{2})(\\d{2})(\\d{2})\\.(\\d{2})," + // Time (HHMMSS.SSS) "([AV])," + // Validity "(\\d{2})(\\d{2}\\.\\d{5})," + // Latitude (DDMM.MMMMM) "([NS])," + "(\\d{3})(\\d{2}\\.\\d{5})," + // Longitude (DDDMM.MMMMM) "([EW])," + "(\\d+\\.\\d{3})?," + // Speed "(\\d+\\.\\d{2})?," + // Course "(\\d{2})(\\d{2})(\\d{2})" + // Date (DDMMYY) ".+"); // Other (Checksumm) static private Pattern gpfidPattern = Pattern.compile("\\$GPFID,(\\d+)$"); protected Object decode( Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { String sentence = (String) msg; // Detect device ID // Parse message if (sentence.contains("$GPRMC")) { // Parse message Matcher parser = pattern.matcher(sentence); if (!parser.matches()) { return null; } // Create new position position = new Position(); Integer index = 1; // 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++))); index += 1; // Skip milliseconds // Validity position.setValid(parser.group(index++).compareTo("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 String speed = parser.group(index++); if (speed != null) { position.setSpeed(Double.valueOf(speed)); } // Course String course = parser.group(index++); if (course != null) { position.setCourse(Double.valueOf(course)); } // 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()); } else if (sentence.contains("$GPFID") && position != null) { Matcher parser = gpfidPattern.matcher(sentence); if (parser.matches()) { if (!identify(parser.group(1), channel)) { return null; } position.setDeviceId(getDeviceId()); return position; } } return null; } }