Java tutorial
/* * Copyright 2013 - 2018 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.Context; import org.traccar.DeviceSession; import org.traccar.NetworkMessage; import org.traccar.Protocol; 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.HashMap; import java.util.HashSet; import java.util.LinkedList; import java.util.List; import java.util.Map; import java.util.Set; public class GalileoProtocolDecoder extends BaseProtocolDecoder { public GalileoProtocolDecoder(Protocol protocol) { super(protocol); } private ByteBuf photo; private static final Map<Integer, Integer> TAG_LENGTH_MAP = new HashMap<>(); static { int[] l1 = { 0x01, 0x02, 0x35, 0x43, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd5, 0x88, 0x8a, 0x8b, 0x8c, 0xa0, 0xaf, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae }; int[] l2 = { 0x04, 0x10, 0x34, 0x40, 0x41, 0x42, 0x45, 0x46, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x60, 0x61, 0x62, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xd6, 0xd7, 0xd8, 0xd9, 0xda }; int[] l3 = { 0x63, 0x64, 0x6f, 0x5d, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e }; int[] l4 = { 0x20, 0x33, 0x44, 0x90, 0xc0, 0xc2, 0xc3, 0xd3, 0xd4, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xf0, 0xf9, 0x5a, 0x47, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xe2, 0xe9 }; for (int i : l1) { TAG_LENGTH_MAP.put(i, 1); } for (int i : l2) { TAG_LENGTH_MAP.put(i, 2); } for (int i : l3) { TAG_LENGTH_MAP.put(i, 3); } for (int i : l4) { TAG_LENGTH_MAP.put(i, 4); } TAG_LENGTH_MAP.put(0x5b, 7); // variable length TAG_LENGTH_MAP.put(0x5c, 68); } private static int getTagLength(int tag) { Integer length = TAG_LENGTH_MAP.get(tag); if (length == null) { throw new IllegalArgumentException("Unknown tag: " + tag); } return length; } private void sendReply(Channel channel, int header, int checksum) { if (channel != null) { ByteBuf reply = Unpooled.buffer(3); reply.writeByte(header); reply.writeShortLE((short) checksum); channel.writeAndFlush(new NetworkMessage(reply, channel.remoteAddress())); } } private void decodeTag(Position position, ByteBuf buf, int tag) { if (tag >= 0x50 && tag <= 0x57) { position.set(Position.PREFIX_ADC + (tag - 0x50), buf.readUnsignedShortLE()); } else if (tag >= 0x60 && tag <= 0x62) { position.set("fuel" + (tag - 0x60), buf.readUnsignedShortLE()); } else if (tag >= 0xa0 && tag <= 0xaf) { position.set("can8BitR" + (tag - 0xa0 + 15), buf.readUnsignedByte()); } else if (tag >= 0xb0 && tag <= 0xb9) { position.set("can16BitR" + (tag - 0xb0 + 5), buf.readUnsignedShortLE()); } else if (tag >= 0xc4 && tag <= 0xd2) { position.set("can8BitR" + (tag - 0xc4), buf.readUnsignedByte()); } else if (tag >= 0xd6 && tag <= 0xda) { position.set("can16BitR" + (tag - 0xd6), buf.readUnsignedShortLE()); } else if (tag >= 0xdb && tag <= 0xdf) { position.set("can32BitR" + (tag - 0xdb), buf.readUnsignedIntLE()); } else if (tag >= 0xe2 && tag <= 0xe9) { position.set("userData" + (tag - 0xe2), buf.readUnsignedIntLE()); } else if (tag >= 0xf0 && tag <= 0xf9) { position.set("can32BitR" + (tag - 0xf0 + 5), buf.readUnsignedIntLE()); } else { decodeTagOther(position, buf, tag); } } private void decodeTagOther(Position position, ByteBuf buf, int tag) { switch (tag) { case 0x01: position.set(Position.KEY_VERSION_HW, buf.readUnsignedByte()); break; case 0x02: position.set(Position.KEY_VERSION_FW, buf.readUnsignedByte()); break; case 0x04: position.set("deviceId", buf.readUnsignedShortLE()); break; case 0x10: position.set(Position.KEY_INDEX, buf.readUnsignedShortLE()); break; case 0x20: position.setTime(new Date(buf.readUnsignedIntLE() * 1000)); break; case 0x33: position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShortLE() * 0.1)); position.setCourse(buf.readUnsignedShortLE() * 0.1); break; case 0x34: position.setAltitude(buf.readShortLE()); break; case 0x35: position.set(Position.KEY_HDOP, buf.readUnsignedByte() * 0.1); break; case 0x40: position.set(Position.KEY_STATUS, buf.readUnsignedShortLE()); break; case 0x41: position.set(Position.KEY_POWER, buf.readUnsignedShortLE() / 1000.0); break; case 0x42: position.set(Position.KEY_BATTERY, buf.readUnsignedShortLE() / 1000.0); break; case 0x43: position.set(Position.KEY_DEVICE_TEMP, buf.readByte()); break; case 0x44: position.set(Position.KEY_ACCELERATION, buf.readUnsignedIntLE()); break; case 0x45: position.set(Position.KEY_OUTPUT, buf.readUnsignedShortLE()); break; case 0x46: position.set(Position.KEY_INPUT, buf.readUnsignedShortLE()); break; case 0x48: position.set("statusExtended", buf.readUnsignedShortLE()); break; case 0x58: position.set("rs2320", buf.readUnsignedShortLE()); break; case 0x59: position.set("rs2321", buf.readUnsignedShortLE()); break; case 0x90: position.set(Position.KEY_DRIVER_UNIQUE_ID, String.valueOf(buf.readUnsignedIntLE())); break; case 0xc0: position.set("fuelTotal", buf.readUnsignedIntLE() * 0.5); break; case 0xc1: position.set(Position.KEY_FUEL_LEVEL, buf.readUnsignedByte() * 0.4); position.set(Position.PREFIX_TEMP + 1, buf.readUnsignedByte() - 40); position.set(Position.KEY_RPM, buf.readUnsignedShortLE() * 0.125); break; case 0xc2: position.set("canB0", buf.readUnsignedIntLE()); break; case 0xc3: position.set("canB1", buf.readUnsignedIntLE()); break; case 0xd4: position.set(Position.KEY_ODOMETER, buf.readUnsignedIntLE()); break; case 0xe0: position.set(Position.KEY_INDEX, buf.readUnsignedIntLE()); break; case 0xe1: position.set(Position.KEY_RESULT, buf.readSlice(buf.readUnsignedByte()).toString(StandardCharsets.US_ASCII)); break; case 0xea: position.set("userDataArray", ByteBufUtil.hexDump(buf.readSlice(buf.readUnsignedByte()))); position.set("userDataArray", ByteBufUtil.hexDump(buf.readSlice(buf.readUnsignedByte()))); break; default: buf.skipBytes(getTagLength(tag)); break; } } @Override protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ByteBuf buf = (ByteBuf) msg; int header = buf.readUnsignedByte(); if (header == 0x01) { return decodePositions(channel, remoteAddress, buf); } else if (header == 0x07) { return decodePhoto(channel, remoteAddress, buf); } return null; } private Object decodePositions(Channel channel, SocketAddress remoteAddress, ByteBuf buf) throws Exception { int length = (buf.readUnsignedShortLE() & 0x7fff) + 3; List<Position> positions = new LinkedList<>(); Set<Integer> tags = new HashSet<>(); boolean hasLocation = false; DeviceSession deviceSession = null; Position position = new Position(getProtocolName()); while (buf.readerIndex() < length) { int tag = buf.readUnsignedByte(); if (tags.contains(tag)) { if (hasLocation && position.getFixTime() != null) { positions.add(position); } tags.clear(); hasLocation = false; position = new Position(getProtocolName()); // new position starts } tags.add(tag); if (tag == 0x03) { deviceSession = getDeviceSession(channel, remoteAddress, buf.readSlice(15).toString(StandardCharsets.US_ASCII)); } else if (tag == 0x30) { hasLocation = true; position.setValid((buf.readUnsignedByte() & 0xf0) == 0x00); position.setLatitude(buf.readIntLE() / 1000000.0); position.setLongitude(buf.readIntLE() / 1000000.0); } else { decodeTag(position, buf, tag); } } if (deviceSession == null) { deviceSession = getDeviceSession(channel, remoteAddress); if (deviceSession == null) { return null; } } if (hasLocation && position.getFixTime() != null) { positions.add(position); } else if (position.getAttributes().containsKey(Position.KEY_RESULT)) { position.setDeviceId(deviceSession.getDeviceId()); getLastLocation(position, null); positions.add(position); } sendReply(channel, 0x02, buf.readUnsignedShortLE()); for (Position p : positions) { p.setDeviceId(deviceSession.getDeviceId()); } return positions.isEmpty() ? null : positions; } private Object decodePhoto(Channel channel, SocketAddress remoteAddress, ByteBuf buf) throws Exception { int length = buf.readUnsignedShortLE(); Position position = null; if (length > 1) { if (photo == null) { photo = Unpooled.buffer(); } buf.readUnsignedByte(); // part number photo.writeBytes(buf, length - 1); } else { DeviceSession deviceSession = getDeviceSession(channel, remoteAddress); String uniqueId = Context.getIdentityManager().getById(deviceSession.getDeviceId()).getUniqueId(); position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); getLastLocation(position, null); position.set(Position.KEY_IMAGE, Context.getMediaManager().writeFile(uniqueId, photo, "jpg")); photo.release(); photo = null; } sendReply(channel, 0x07, buf.readUnsignedShortLE()); return position; } }