/* * Copyright 2016 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 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.Position; import java.net.SocketAddress; import java.nio.charset.StandardCharsets; import java.util.Date; import java.util.LinkedList; import java.util.List; public class NvsProtocolDecoder extends BaseProtocolDecoder { public NvsProtocolDecoder(NvsProtocol protocol) { super(protocol); } private void sendResponse(Channel channel, String response) { if (channel != null) { channel.write(ChannelBuffers.copiedBuffer(response, StandardCharsets.US_ASCII)); } } @Override protected Object decode( Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ChannelBuffer buf = (ChannelBuffer) msg; if (buf.getUnsignedByte(buf.readerIndex()) == 0) { buf.readUnsignedShort(); // length String imei = buf.toString(buf.readerIndex(), 15, StandardCharsets.US_ASCII); if (!identify(imei, channel, remoteAddress)) { sendResponse(channel, "NO01"); } else { sendResponse(channel, "OK"); } } else if (hasDeviceId()) { List<Position> positions = new LinkedList<>(); buf.skipBytes(4); // marker buf.readUnsignedShort(); // length buf.readLong(); // imei buf.readUnsignedByte(); // codec int count = buf.readUnsignedByte(); for (int i = 0; i < count; i++) { Position position = new Position(); position.setProtocol(getProtocolName()); position.setDeviceId(getDeviceId()); position.setTime(new Date(buf.readUnsignedInt() * 1000)); position.set("reason", buf.readUnsignedByte()); position.setLongitude(buf.readInt() / 10000000.0); position.setLatitude(buf.readInt() / 10000000.0); position.setAltitude(buf.readShort()); position.setCourse(buf.readUnsignedShort()); position.set(Position.KEY_SATELLITES, buf.readUnsignedByte()); position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort())); position.setValid(buf.readUnsignedByte() != 0); buf.readUnsignedByte(); // used systems buf.readUnsignedByte(); // cause element id // Read 1 byte data int cnt = buf.readUnsignedByte(); for (int j = 0; j < cnt; j++) { position.set(Position.PREFIX_IO + buf.readUnsignedByte(), buf.readUnsignedByte()); } // Read 2 byte data cnt = buf.readUnsignedByte(); for (int j = 0; j < cnt; j++) { position.set(Position.PREFIX_IO + buf.readUnsignedByte(), buf.readUnsignedShort()); } // Read 4 byte data cnt = buf.readUnsignedByte(); for (int j = 0; j < cnt; j++) { position.set(Position.PREFIX_IO + buf.readUnsignedByte(), buf.readUnsignedInt()); } // Read 8 byte data cnt = buf.readUnsignedByte(); for (int j = 0; j < cnt; j++) { position.set(Position.PREFIX_IO + buf.readUnsignedByte(), buf.readLong()); } positions.add(position); } return positions; } return null; } }