content: /*
   * Copyright 2020-2023 the original author or authors.
   *
   * 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
   *
   *      https://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 com.jun.mqttx.broker.handler;
  
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.handler.codec.mqtt.*;
  
  /**
   * {@link MqttMessageType#PINGREQ} 消息处理器
   *
   * @author Jun
   * @since 1.0.4
   */
  @Handler(type = MqttMessageType.PINGREQ)
  public class PingReqHandler implements MqttMessageHandler {
  
      @Override
      public void process(ChannelHandlerContext ctx, MqttMessage msg) {
          MqttMessage mqttMessage = MqttMessageFactory.newMessage(
                  new MqttFixedHeader(MqttMessageType.PINGRESP, false, MqttQoS.AT_MOST_ONCE, false, 0),
                  null, null);
          ctx.writeAndFlush(mqttMessage);
      }
  }
  