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/*
* Copyright 2020 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.MqttConnAckMessage;
import io.netty.handler.codec.mqtt.MqttConnectMessage;
import io.netty.handler.codec.mqtt.MqttConnectReturnCode;
import io.netty.handler.codec.mqtt.MqttMessageBuilders;
import io.netty.handler.codec.mqtt.MqttPublishMessage;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
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;
}
}
private String getKey(int sensorId) {
switch (sensorId) {
case 0x300C:
return Position.KEY_RPM;
case 0x4003:
return Position.KEY_ODOMETER;
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;
MqttConnAckMessage response = MqttMessageBuilders.connAck().returnCode(returnCode).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();
if (type == 1) {
ByteBuf record = buf.readSlice(length);
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(new Date(record.readUnsignedIntLE()));
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(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 {
String key = getKey(sensorId);
Object value = readValue(record, sensorType);
if (key != null && value != null) {
position.getAttributes().put(key, value);
}
}
}
positions.add(position);
} else {
buf.skipBytes(length);
}
}
buf.readUnsignedByte(); // checksum
return positions.isEmpty() ? null : positions;
}
return null;
}
}
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