/* * Copyright 2021 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 io.netty.buffer.ByteBuf; import io.netty.buffer.ByteBufUtil; import io.netty.buffer.Unpooled; import io.netty.channel.Channel; import org.traccar.BaseProtocolDecoder; import org.traccar.session.DeviceSession; import org.traccar.NetworkMessage; import org.traccar.Protocol; import org.traccar.helper.BcdUtil; 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.charset.StandardCharsets; import java.util.LinkedList; import java.util.List; public class Gs100ProtocolDecoder extends BaseProtocolDecoder { public Gs100ProtocolDecoder(Protocol protocol) { super(protocol); } @Override protected Object decode( Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ByteBuf buf = (ByteBuf) msg; String header = buf.readCharSequence(2, StandardCharsets.US_ASCII).toString(); if (header.equals("GL")) { buf.skipBytes(1); String imei = buf.readCharSequence(buf.readUnsignedByte(), StandardCharsets.US_ASCII).toString(); DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei); if (channel != null && deviceSession != null) { ByteBuf response = Unpooled.copiedBuffer("GS100", StandardCharsets.US_ASCII); channel.writeAndFlush(new NetworkMessage(response, remoteAddress)); } return null; } else { DeviceSession deviceSession = getDeviceSession(channel, remoteAddress); if (deviceSession == null) { return null; } List<Position> positions = new LinkedList<>(); int count = buf.readUnsignedByte(); for (int i = 0; i < count; i++) { int endIndex = buf.readUnsignedByte() + buf.readerIndex(); Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); int status = buf.readUnsignedMedium(); position.set(Position.KEY_STATUS, status); if (BitUtil.check(status, 8 + 8 + 7)) { DateBuilder dateBuilder = new DateBuilder() .setHour(BcdUtil.readInteger(buf, 2)) .setMinute(BcdUtil.readInteger(buf, 2)) .setSecond(BcdUtil.readInteger(buf, 2)) .setDay(BcdUtil.readInteger(buf, 2)) .setMonth(BcdUtil.readInteger(buf, 2)) .setYear(BcdUtil.readInteger(buf, 2)); position.setTime(dateBuilder.getDate()); position.setValid(true); String coordinates = ByteBufUtil.hexDump(buf.readSlice(9)); position.setLongitude(Integer.parseInt(coordinates.substring(0, 3)) + Integer.parseInt(coordinates.substring(3, 9)) * 0.0001 / 60); position.setLatitude(Integer.parseInt(coordinates.substring(10, 12)) + Integer.parseInt(coordinates.substring(12, 18)) * 0.0001 / 60); int flags = Integer.parseInt(coordinates.substring(9, 10), 16); if (!BitUtil.check(flags, 3)) { position.setLongitude(-position.getLongitude()); } if (!BitUtil.check(flags, 2)) { position.setLatitude(-position.getLatitude()); } String other = ByteBufUtil.hexDump(buf.readSlice(4)); position.setSpeed(UnitsConverter.knotsFromKph(Integer.parseInt(other.substring(0, 5)) * 0.01)); position.setCourse(Integer.parseInt(other.substring(5, 8))); } else { getLastLocation(position, null); } positions.add(position); buf.readerIndex(endIndex); } if (channel != null) { ByteBuf response = Unpooled.buffer(); response.writeCharSequence("GS100", StandardCharsets.US_ASCII); response.writeByte(count); channel.writeAndFlush(new NetworkMessage(response, remoteAddress)); } return positions.isEmpty() ? null : positions; } } }