/* * Copyright 2017 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 org.jboss.netty.buffer.ChannelBuffer; import org.jboss.netty.buffer.ChannelBuffers; import org.jboss.netty.channel.Channel; import org.traccar.BaseProtocolDecoder; import org.traccar.DeviceSession; import org.traccar.helper.BitUtil; import org.traccar.helper.UnitsConverter; import org.traccar.model.Position; import java.net.SocketAddress; import java.nio.ByteOrder; import java.nio.charset.StandardCharsets; import java.util.Date; import java.util.LinkedList; import java.util.List; public class DmtProtocolDecoder extends BaseProtocolDecoder { public DmtProtocolDecoder(DmtProtocol protocol) { super(protocol); } public static final int MSG_HELLO = 0x00; public static final int MSG_HELLO_RESPONSE = 0x01; public static final int MSG_DATA_RECORD = 0x04; public static final int MSG_COMMIT = 0x05; public static final int MSG_COMMIT_RESPONSE = 0x06; @Override protected Object decode( Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ChannelBuffer buf = (ChannelBuffer) msg; buf.skipBytes(2); // header int type = buf.readUnsignedByte(); buf.readUnsignedShort(); // length if (type == MSG_HELLO) { buf.readUnsignedInt(); // device serial number DeviceSession deviceSession = getDeviceSession( channel, remoteAddress, buf.readBytes(15).toString(StandardCharsets.US_ASCII)); if (channel != null) { ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 0); response.writeByte(0x02); response.writeByte(0x55); // header response.writeByte(MSG_HELLO_RESPONSE); response.writeShort(4 + 4); response.writeInt((int) (System.currentTimeMillis() / 1000)); response.writeInt(deviceSession != null ? 0 : 1); // flags channel.write(response); } } else if (type == MSG_COMMIT) { if (channel != null) { ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 0); response.writeByte(0x02); response.writeByte(0x55); // header response.writeByte(MSG_COMMIT_RESPONSE); response.writeShort(1); response.writeByte(1); // flags (success) channel.write(response); } } else if (type == MSG_DATA_RECORD) { DeviceSession deviceSession = getDeviceSession(channel, remoteAddress); if (deviceSession == null) { return null; } List<Position> positions = new LinkedList<>(); while (buf.readable()) { int recordEnd = buf.readerIndex() + buf.readUnsignedShort(); Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); position.set(Position.KEY_INDEX, buf.readUnsignedInt()); position.setDeviceTime(new Date(1356998400000L + buf.readUnsignedInt() * 1000)); // since 1 Jan 2013 position.set(Position.KEY_EVENT, buf.readUnsignedByte()); while (buf.readerIndex() < recordEnd) { int fieldId = buf.readUnsignedByte(); int fieldLength = buf.readUnsignedByte(); int fieldEnd = buf.readerIndex() + (fieldLength == 255 ? buf.readUnsignedShort() : fieldLength); if (fieldId == 0) { position.setFixTime(new Date(1356998400000L + buf.readUnsignedInt() * 1000)); position.setLatitude(buf.readInt() * 0.0000001); position.setLongitude(buf.readInt() * 0.0000001); position.setAltitude(buf.readShort()); position.setSpeed(UnitsConverter.knotsFromCps(buf.readUnsignedShort())); buf.readUnsignedByte(); // speed accuracy position.setCourse(buf.readUnsignedByte() * 2); position.set(Position.KEY_PDOP, buf.readUnsignedByte() * 0.1); position.setAccuracy(buf.readUnsignedByte()); position.setValid(buf.readUnsignedByte() != 0); } else if (fieldId == 2) { int input = buf.readInt(); int output = buf.readUnsignedShort(); int status = buf.readUnsignedShort(); position.set(Position.KEY_IGNITION, BitUtil.check(input, 0)); position.set(Position.KEY_INPUT, input); position.set(Position.KEY_OUTPUT, output); position.set(Position.KEY_STATUS, status); } else if (fieldId == 6) { while (buf.readerIndex() < fieldEnd) { switch (buf.readUnsignedByte()) { case 1: position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.001); break; case 2: position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.01); break; case 3: position.set(Position.KEY_DEVICE_TEMP, buf.readShort() * 0.01); break; case 4: position.set(Position.KEY_RSSI, buf.readUnsignedShort()); break; case 5: position.set("solarPower", buf.readUnsignedShort() * 0.001); break; default: break; } } } buf.readerIndex(fieldEnd); } if (position.getFixTime() == null) { getLastLocation(position, position.getDeviceTime()); } positions.add(position); } return positions; } return null; } }