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/*
* Copyright 2020 - 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.channel.Channel;
import io.netty.handler.codec.mqtt.MqttConnectMessage;
import io.netty.handler.codec.mqtt.MqttConnectReturnCode;
import io.netty.handler.codec.mqtt.MqttMessage;
import io.netty.handler.codec.mqtt.MqttMessageBuilders;
import io.netty.handler.codec.mqtt.MqttPublishMessage;
import io.netty.handler.codec.mqtt.MqttSubscribeMessage;
import org.traccar.BaseProtocolDecoder;
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.LinkedList;
import java.util.List;
public class IotmProtocolDecoder extends BaseProtocolDecoder {
public IotmProtocolDecoder(Protocol protocol) {
super(protocol);
}
private Object readValue(ByteBuf buf, int sensorType) {
switch (sensorType) {
case 0:
return false;
case 1:
return true;
case 3:
return 0;
case 4:
return buf.readUnsignedByte();
case 5:
return buf.readUnsignedShortLE();
case 6:
return buf.readUnsignedIntLE();
case 7:
case 11:
return buf.readLongLE();
case 8:
return buf.readByte();
case 9:
return buf.readShortLE();
case 10:
return buf.readIntLE();
case 12:
return buf.readFloatLE();
case 13:
return buf.readDoubleLE();
case 32:
return buf.readCharSequence(buf.readUnsignedByte(), StandardCharsets.US_ASCII).toString();
case 33:
return ByteBufUtil.hexDump(buf.readSlice(buf.readUnsignedByte()));
case 64:
return buf.readCharSequence(buf.readUnsignedShortLE(), StandardCharsets.US_ASCII).toString();
case 65:
return ByteBufUtil.hexDump(buf.readSlice(buf.readUnsignedShortLE()));
case 2:
default:
return null;
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
if (msg instanceof MqttConnectMessage) {
MqttConnectMessage message = (MqttConnectMessage) msg;
DeviceSession deviceSession = getDeviceSession(
channel, remoteAddress, message.payload().clientIdentifier());
MqttConnectReturnCode returnCode = deviceSession != null
? MqttConnectReturnCode.CONNECTION_ACCEPTED
: MqttConnectReturnCode.CONNECTION_REFUSED_IDENTIFIER_REJECTED;
MqttMessage response = MqttMessageBuilders.connAck().returnCode(returnCode).build();
if (channel != null) {
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
} else if (msg instanceof MqttSubscribeMessage) {
MqttSubscribeMessage message = (MqttSubscribeMessage) msg;
MqttMessage response = MqttMessageBuilders.subAck()
.packetId((short) message.variableHeader().messageId())
.build();
if (channel != null) {
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
} else if (msg instanceof MqttPublishMessage) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
List<Position> positions = new LinkedList<>();
MqttPublishMessage message = (MqttPublishMessage) msg;
ByteBuf buf = message.payload();
buf.readUnsignedByte(); // structure version
while (buf.readableBytes() > 1) {
int type = buf.readUnsignedByte();
int length = buf.readUnsignedShortLE();
ByteBuf record = buf.readSlice(length);
if (type == 1) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(new Date(record.readUnsignedIntLE() * 1000));
while (record.readableBytes() > 0) {
int sensorType = record.readUnsignedByte();
int sensorId = record.readUnsignedShortLE();
if (sensorType == 14) {
position.setValid(true);
position.setLatitude(record.readFloatLE());
position.setLongitude(record.readFloatLE());
position.setSpeed(UnitsConverter.knotsFromKph(record.readUnsignedShortLE()));
position.set(Position.KEY_HDOP, record.readUnsignedByte());
position.set(Position.KEY_SATELLITES, record.readUnsignedByte());
position.setCourse(record.readUnsignedShortLE());
position.setAltitude(record.readShortLE());
} else {
if (sensorType == 3) continue;
String key;
switch (sensorId) {
case 0x0008:
if (sensorType > 0) {
position.set(Position.KEY_ALARM, Position.ALARM_JAMMING);
}
break;
case 0x0010:
case 0x0011:
case 0x0012:
case 0x0013:
key = Position.PREFIX_IN + (sensorId - 0x0010 + 2);
position.set(key, sensorType > 0);
break;
case 0x001E:
position.set("buttonPresent", sensorType > 0);
break;
case 0x006D:
position.set(Position.KEY_IGNITION, sensorType > 0);
break;
case 0x3000:
position.set(Position.KEY_POWER, record.readUnsignedShortLE() * 0.001);
break;
case 0x3001:
case 0x3002:
case 0x3003:
key = Position.PREFIX_ADC + (0x3003 - sensorId + 3);
position.set(key, record.readUnsignedShortLE() * 0.001);
break;
case 0x3004:
position.set(Position.KEY_BATTERY, record.readUnsignedShortLE() * 0.001);
break;
case 0x300C:
position.set(Position.KEY_RPM, record.readUnsignedShortLE());
break;
case 0x4003:
position.set(Position.KEY_ODOMETER, record.readUnsignedIntLE() * 5);
break;
case 0x5000:
position.set(Position.KEY_DRIVER_UNIQUE_ID, String.valueOf(record.readLongLE()));
break;
case 0xA001:
position.set(Position.KEY_ACCELERATION, record.readFloatLE());
break;
case 0xA002:
position.set("cornering", record.readFloatLE());
break;
case 0xA017:
key = Position.PREFIX_TEMP + (sensorId - 0xA017 + 1);
position.set(key, record.readFloatLE());
break;
default:
key = Position.PREFIX_IO + sensorId;
position.getAttributes().put(key, readValue(record, sensorType));
break;
}
}
}
positions.add(position);
} else if (type == 3) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
getLastLocation(position, new Date(record.readUnsignedIntLE() * 1000));
record.readUnsignedByte(); // function identifier
position.set(Position.KEY_EVENT, record.readUnsignedByte());
positions.add(position);
}
}
buf.readUnsignedByte(); // checksum
MqttMessage response = MqttMessageBuilders.pubAck()
.packetId((short) message.variableHeader().packetId())
.build();
if (channel != null) {
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
return positions.isEmpty() ? null : positions;
}
return null;
}
}
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