Java tutorial
/* * Copyright 2017 - 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.channel.Channel; import org.traccar.BaseProtocolDecoder; import org.traccar.DeviceSession; import org.traccar.Protocol; import org.traccar.helper.BitBuffer; import org.traccar.helper.BitUtil; import org.traccar.helper.DateBuilder; import org.traccar.helper.UnitsConverter; import org.traccar.model.CellTower; import org.traccar.model.Network; 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 Gl200BinaryProtocolDecoder extends BaseProtocolDecoder { public Gl200BinaryProtocolDecoder(Protocol protocol) { super(protocol); } private Date decodeTime(ByteBuf buf) { DateBuilder dateBuilder = new DateBuilder() .setDate(buf.readUnsignedShort(), buf.readUnsignedByte(), buf.readUnsignedByte()) .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()); return dateBuilder.getDate(); } public static final int MSG_RSP_LCB = 3; public static final int MSG_RSP_GEO = 8; public static final int MSG_RSP_COMPRESSED = 100; private List<Position> decodeLocation(Channel channel, SocketAddress remoteAddress, ByteBuf buf) { List<Position> positions = new LinkedList<>(); int type = buf.readUnsignedByte(); buf.readUnsignedInt(); // mask buf.readUnsignedShort(); // length buf.readUnsignedByte(); // device type buf.readUnsignedShort(); // protocol version buf.readUnsignedShort(); // firmware version DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.format("%015d", buf.readLong())); if (deviceSession == null) { return null; } int battery = buf.readUnsignedByte(); int power = buf.readUnsignedShort(); if (type == MSG_RSP_GEO) { buf.readUnsignedByte(); // reserved buf.readUnsignedByte(); // reserved } buf.readUnsignedByte(); // motion status int satellites = buf.readUnsignedByte(); if (type != MSG_RSP_COMPRESSED) { buf.readUnsignedByte(); // index } if (type == MSG_RSP_LCB) { buf.readUnsignedByte(); // phone length for (int b = buf.readUnsignedByte();; b = buf.readUnsignedByte()) { if ((b & 0xf) == 0xf || (b & 0xf0) == 0xf0) { break; } } } if (type == MSG_RSP_COMPRESSED) { int count = buf.readUnsignedShort(); BitBuffer bits; int speed = 0; int heading = 0; int latitude = 0; int longitude = 0; long time = 0; for (int i = 0; i < count; i++) { if (time > 0) { time += 1; } Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); switch (BitUtil.from(buf.getUnsignedByte(buf.readerIndex()), 8 - 2)) { case 1: bits = new BitBuffer(buf.readSlice(3)); bits.readUnsigned(2); // point attribute bits.readUnsigned(1); // fix type speed = bits.readUnsigned(12); heading = bits.readUnsigned(9); longitude = buf.readInt(); latitude = buf.readInt(); if (time == 0) { time = buf.readUnsignedInt(); } break; case 2: bits = new BitBuffer(buf.readSlice(5)); bits.readUnsigned(2); // point attribute bits.readUnsigned(1); // fix type speed += bits.readSigned(7); heading += bits.readSigned(7); longitude += bits.readSigned(12); latitude += bits.readSigned(11); break; default: buf.readUnsignedByte(); // invalid or same continue; } position.setValid(true); position.setTime(new Date(time * 1000)); position.setSpeed(UnitsConverter.knotsFromKph(speed * 0.1)); position.setCourse(heading); position.setLongitude(longitude * 0.000001); position.setLatitude(latitude * 0.000001); positions.add(position); } } else { int count = buf.readUnsignedByte(); for (int i = 0; i < count; i++) { Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); position.set(Position.KEY_BATTERY_LEVEL, battery); position.set(Position.KEY_POWER, power); position.set(Position.KEY_SATELLITES, satellites); int hdop = buf.readUnsignedByte(); position.setValid(hdop > 0); position.set(Position.KEY_HDOP, hdop); position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedMedium() * 0.1)); position.setCourse(buf.readUnsignedShort()); position.setAltitude(buf.readShort()); position.setLongitude(buf.readInt() * 0.000001); position.setLatitude(buf.readInt() * 0.000001); position.setTime(decodeTime(buf)); position.setNetwork(new Network(CellTower.from(buf.readUnsignedShort(), buf.readUnsignedShort(), buf.readUnsignedShort(), buf.readUnsignedShort()))); buf.readUnsignedByte(); // reserved positions.add(position); } } return positions; } public static final int MSG_EVT_BPL = 6; public static final int MSG_EVT_VGN = 45; public static final int MSG_EVT_VGF = 46; public static final int MSG_EVT_UPD = 15; public static final int MSG_EVT_IDF = 17; public static final int MSG_EVT_GSS = 21; public static final int MSG_EVT_GES = 26; public static final int MSG_EVT_GPJ = 31; public static final int MSG_EVT_RMD = 35; public static final int MSG_EVT_JDS = 33; public static final int MSG_EVT_CRA = 23; public static final int MSG_EVT_UPC = 34; private Position decodeEvent(Channel channel, SocketAddress remoteAddress, ByteBuf buf) { Position position = new Position(getProtocolName()); int type = buf.readUnsignedByte(); buf.readUnsignedInt(); // mask buf.readUnsignedShort(); // length buf.readUnsignedByte(); // device type buf.readUnsignedShort(); // protocol version position.set(Position.KEY_VERSION_FW, String.valueOf(buf.readUnsignedShort())); DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.format("%015d", buf.readLong())); if (deviceSession == null) { return null; } position.setDeviceId(deviceSession.getDeviceId()); position.set(Position.KEY_BATTERY_LEVEL, buf.readUnsignedByte()); position.set(Position.KEY_POWER, buf.readUnsignedShort()); buf.readUnsignedByte(); // motion status position.set(Position.KEY_SATELLITES, buf.readUnsignedByte()); switch (type) { case MSG_EVT_BPL: buf.readUnsignedShort(); // backup battery voltage break; case MSG_EVT_VGN: case MSG_EVT_VGF: buf.readUnsignedShort(); // reserved buf.readUnsignedByte(); // report type buf.readUnsignedInt(); // ignition duration break; case MSG_EVT_UPD: buf.readUnsignedShort(); // code buf.readUnsignedByte(); // retry break; case MSG_EVT_IDF: buf.readUnsignedInt(); // idling duration break; case MSG_EVT_GSS: buf.readUnsignedByte(); // gps signal status buf.readUnsignedInt(); // reserved break; case MSG_EVT_GES: buf.readUnsignedShort(); // trigger geo id buf.readUnsignedByte(); // trigger geo enable buf.readUnsignedByte(); // trigger mode buf.readUnsignedInt(); // radius buf.readUnsignedInt(); // check interval break; case MSG_EVT_GPJ: buf.readUnsignedByte(); // cw jamming value buf.readUnsignedByte(); // gps jamming state break; case MSG_EVT_RMD: buf.readUnsignedByte(); // roaming state break; case MSG_EVT_JDS: buf.readUnsignedByte(); // jamming state break; case MSG_EVT_CRA: buf.readUnsignedByte(); // crash counter break; case MSG_EVT_UPC: buf.readUnsignedByte(); // command id buf.readUnsignedShort(); // result break; default: break; } buf.readUnsignedByte(); // count int hdop = buf.readUnsignedByte(); position.setValid(hdop > 0); position.set(Position.KEY_HDOP, hdop); position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedMedium() * 0.1)); position.setCourse(buf.readUnsignedShort()); position.setAltitude(buf.readShort()); position.setLongitude(buf.readInt() * 0.000001); position.setLatitude(buf.readInt() * 0.000001); position.setTime(decodeTime(buf)); position.setNetwork(new Network(CellTower.from(buf.readUnsignedShort(), buf.readUnsignedShort(), buf.readUnsignedShort(), buf.readUnsignedShort()))); buf.readUnsignedByte(); // reserved return position; } public static final int MSG_INF_GPS = 2; public static final int MSG_INF_CID = 4; public static final int MSG_INF_CSQ = 5; public static final int MSG_INF_VER = 6; public static final int MSG_INF_BAT = 7; public static final int MSG_INF_TMZ = 9; public static final int MSG_INF_GIR = 10; private Position decodeInformation(Channel channel, SocketAddress remoteAddress, ByteBuf buf) { Position position = new Position(getProtocolName()); int type = buf.readUnsignedByte(); buf.readUnsignedInt(); // mask buf.readUnsignedShort(); // length DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.format("%015d", buf.readLong())); if (deviceSession == null) { return null; } position.setDeviceId(deviceSession.getDeviceId()); buf.readUnsignedByte(); // device type buf.readUnsignedShort(); // protocol version position.set(Position.KEY_VERSION_FW, String.valueOf(buf.readUnsignedShort())); if (type == MSG_INF_VER) { buf.readUnsignedShort(); // hardware version buf.readUnsignedShort(); // mcu version buf.readUnsignedShort(); // reserved } buf.readUnsignedByte(); // motion status buf.readUnsignedByte(); // reserved position.set(Position.KEY_SATELLITES, buf.readUnsignedByte()); buf.readUnsignedByte(); // mode buf.skipBytes(7); // last fix time buf.readUnsignedByte(); // reserved buf.readUnsignedByte(); buf.readUnsignedShort(); // response report mask buf.readUnsignedShort(); // ign interval buf.readUnsignedShort(); // igf interval buf.readUnsignedInt(); // reserved buf.readUnsignedByte(); // reserved if (type == MSG_INF_BAT) { position.set(Position.KEY_CHARGE, buf.readUnsignedByte() != 0); position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.001); position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.001); position.set(Position.KEY_BATTERY_LEVEL, buf.readUnsignedByte()); } buf.skipBytes(10); // iccid if (type == MSG_INF_CSQ) { position.set(Position.KEY_RSSI, buf.readUnsignedByte()); buf.readUnsignedByte(); } buf.readUnsignedByte(); // time zone flags buf.readUnsignedShort(); // time zone offset if (type == MSG_INF_GIR) { buf.readUnsignedByte(); // gir trigger buf.readUnsignedByte(); // cell number position.setNetwork(new Network(CellTower.from(buf.readUnsignedShort(), buf.readUnsignedShort(), buf.readUnsignedShort(), buf.readUnsignedShort()))); buf.readUnsignedByte(); // ta buf.readUnsignedByte(); // rx level } getLastLocation(position, decodeTime(buf)); return position; } @Override protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ByteBuf buf = (ByteBuf) msg; switch (buf.readSlice(4).toString(StandardCharsets.US_ASCII)) { case "+RSP": return decodeLocation(channel, remoteAddress, buf); case "+INF": return decodeInformation(channel, remoteAddress, buf); case "+EVT": return decodeEvent(channel, remoteAddress, buf); default: return null; } } }