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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2019 The Netty Project
 *
 * The Netty Project licenses this file to you 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 io.netty.example.mqtt.heartBeat;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.mqtt.MqttConnectMessage;
import io.netty.handler.codec.mqtt.MqttConnectPayload;
import io.netty.handler.codec.mqtt.MqttConnectVariableHeader;
import io.netty.handler.codec.mqtt.MqttFixedHeader;
import io.netty.handler.codec.mqtt.MqttMessage;
import io.netty.handler.codec.mqtt.MqttMessageType;
import io.netty.handler.codec.mqtt.MqttQoS;
import io.netty.handler.timeout.IdleStateEvent;
import io.netty.util.ReferenceCountUtil;

public class MqttHeartBeatClientHandler extends ChannelInboundHandlerAdapter {

    private static final String PROTOCOL_NAME_MQTT_3_1_1 = "MQTT";
    private static final int PROTOCOL_VERSION_MQTT_3_1_1 = 4;

    private final String clientId;
    private final String userName;
    private final byte[] password;

    public MqttHeartBeatClientHandler(String clientId, String userName, String password) {
        this.clientId = clientId;
        this.userName = userName;
        this.password = password.getBytes();
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        // discard all messages
        ReferenceCountUtil.release(msg);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        MqttFixedHeader connectFixedHeader =
                new MqttFixedHeader(MqttMessageType.CONNECT, false, MqttQoS.AT_MOST_ONCE, false, 0);
        MqttConnectVariableHeader connectVariableHeader =
                new MqttConnectVariableHeader(PROTOCOL_NAME_MQTT_3_1_1, PROTOCOL_VERSION_MQTT_3_1_1, true, true, false,
                                              0, false, false, 20);
        MqttConnectPayload connectPayload = new MqttConnectPayload(clientId, null, null, userName, password);
        MqttConnectMessage connectMessage =
                new MqttConnectMessage(connectFixedHeader, connectVariableHeader, connectPayload);
        ctx.writeAndFlush(connectMessage);
        System.out.println("Sent CONNECT");
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        if (evt instanceof IdleStateEvent) {
            MqttFixedHeader pingreqFixedHeader =
                    new MqttFixedHeader(MqttMessageType.PINGREQ, false, MqttQoS.AT_MOST_ONCE, false, 0);
            MqttMessage pingreqMessage = new MqttMessage(pingreqFixedHeader);
            ctx.writeAndFlush(pingreqMessage);
            System.out.println("Sent PINGREQ");
        } else {
            super.userEventTriggered(ctx, evt);
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();
    }
}