分布式物联网平台EMQX-MQTT
1、安装(不推荐docker部署)
docker部署
docker run -d --name mqtt-broker-emqx-zhgsgl -p 1883:1883 -p 8081:8081 -p 8083:8083 -p 8883:8883 -p 8084:8084 -p 18083:18083 emqx/emqx:v4.0.0
admin/public
2、整合springboot
报错处理
整合过程中发生已存在的bean定义，需要在配置文件添加配置
@MessagingGateway(defaultRequestChannel = "mqttOutboundChannel")
public interface MqttGateway {
void sendToMqtt(String data, @Header(MqttHeaders.TOPIC) String topic);
}
main:
allow-bean-definition-overriding: true
3、简易版客户端
参考：https://www.cnblogs.com/zhuangyao/p/12320500.html
// package com.jtsmartway.zhgsgl.iot.platform.mqttbroker;
//
// import org.eclipse.paho.client.mqttv3.*;
// import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
// import org.springframework.context.annotation.Bean;
// import org.springframework.context.annotation.Configuration;
//
// /**
// * @author JHL
// * @version 1.0
// * @date 2022/5/17 18:07
// * @since : JDK 11
// */
// @Configuration
// public class TestEmqxClient {
//
//
//
// @Bean
// public MqttClient getMqttClient() {
// try {
// // host为主机名，test为clientid即连接MQTT的客户端ID，一般以客户端唯一标识符表示，MemoryPersistence设置clientid的保存形式，默认为以内存保存
// MqttClient client = new MqttClient("tcp://192.168.2.201:1883", "test", new MemoryPersistence());
// // MQTT的连接设置
// MqttConnectOptions options = new MqttConnectOptions();
// // 设置是否清空session,这里如果设置为false表示服务器会保留客户端的连接记录，这里设置为true表示每次连接到服务器都以新的身份连接
// options.setCleanSession(true);
// // 设置连接的用户名
// options.setUserName("admin");
// // 设置连接的密码
// options.setPassword("public".toCharArray());
// // 设置超时时间 单位为秒
// options.setConnectionTimeout(10);
// // 设置会话心跳时间 单位为秒 服务器会每隔1.5*20秒的时间向客户端发送个消息判断客户端是否在线，但这个方法并没有重连的机制
// options.setKeepAliveInterval(20);
// // 设置回调函数
// client.setCallback(new MqttCallback() {
// @Override
// public void connectionLost(Throwable cause) {
// System.out.println("connectionLost");
// }
// @Override
// public void messageArrived(String topic, MqttMessage message) throws Exception {
// System.out.println(message);
// // handleMessage(topic,message);
// }
// @Override
// public void deliveryComplete(IMqttDeliveryToken token) {
// System.out.println("deliveryComplete---------" + token.isComplete());
// }
// });
// client.connect(options);
// //订阅消息
// // System.out.println(topic);
// // client.subscribe(topic);
// return client;
// } catch (Exception e) {
// e.printStackTrace();
// return null;
// }
// }
// }
4、设备模拟
可能问题：工具无法连接MQTT broker，将1.工具安装至c盘，2.选仅为我安装
5、二次开发EMQX的HTTP API
https://www.emqx.io/docs/zh/v4.4/advanced/http-api.html#接口安全
6、可能遇到的问题
spring-integration-mqtt 集成broker后启动项目频繁报 Lost connection 错误
Lost connection: 已断开连接; retrying...
解决方案原文：https://blog.csdn.net/lisheng19870305/article/details/119896635
7、EMQX主机部署（推荐）
参考文档：
https://www.emqx.io/docs/zh/v5.0/deploy/install.html#rpm-deb%E5%8C%85%E5%AE%89%E8%A3%85-linux
https://gitee.com/emqx/emqx?_from=gitee_search#https://gitee.com/link?target=https%3A%2F%2Fwww.emqx.io%2Fzh%2Fdownloads
下载二进制包：
https://www.emqx.io/zh/downloads?os=CentOS
wget https://www.emqx.com/zh/downloads/broker/5.0.14/emqx-5.0.14-el7-amd64.tar.gz
解压：
tar zxvf emqx-5.0.14-el7-amd64.tar.gz
帮助：emqx -h
启动：emqx start
停止：emqx stop
dashboard端口：18083
默认令牌：admin/public
修改后令牌：admin/Jtzl@root@2022!@#
系统参数调优：
https://www.emqx.io/docs/zh/v5.0/deploy/tune.html#linux-操作系统参数
配置修改：
https://www.emqx.io/docs/zh/v5.0/admin/cfg.html
【emqx.conf】
## NOTE:
## Configs in this file might be overridden by:
## 1. Environment variables which start with 'EMQX_' prefix
## 2. File $EMQX_NODE__DATA_DIR/configs/cluster-override.conf
## 3. File $EMQX_NODE__DATA_DIR/configs/local-override.conf
##
## The *-override.conf files are overwritten at runtime when changes
## are made from EMQX dashboard UI, management HTTP API, or CLI.
## All configuration details can be found in emqx.conf.example
node {
name = "jtemqxpro@0.0.0.0"
cookie = "jt_emqx_pro131"
data_dir = "data"
}
log {
file_handlers.default {
level = warning
file = "log/emqx.log"
}
}
cluster {
name = emqxcl
discovery_strategy = manual
}
listeners.tcp.default {
bind = "0.0.0.0:1883"
max_connections = 1024000
acceptors = 128
}
mqtt {
max_mqueue_len = 30000
}
listeners.ws.default {
bind = "0.0.0.0:8083"
max_connections = 1024000
websocket.mqtt_path = "/mqtt"
}
dashboard {
listeners.http {
bind = 18083
}
default_username = "admin"
default_password = "public"
}
authorization {
deny_action = ignore
no_match = allow
sources = [
{
type = file
enable = true
## This file is immutable to EMQX.
## Once new rules are created from dashboard UI or HTTP API,
## the file 'data/authz/acl.conf' is used instead of this one
path = "etc/acl.conf"
}
]
}
##listeners.ssl.default {
## bind = "0.0.0.0:8883"
## max_connections = 512000
## ssl_options {
## keyfile = "etc/certs/key.pem"
## certfile = "etc/certs/cert.pem"
## cacertfile = "etc/certs/cacert.pem"
## }
##}
##listeners.wss.default {
## bind = "0.0.0.0:8084"
## max_connections = 512000
## websocket.mqtt_path = "/mqtt"
## ssl_options {
## keyfile = "etc/certs/key.pem"
## certfile = "etc/certs/cert.pem"
## cacertfile = "etc/certs/cacert.pem"
## }
##}
## listeners.quic.default {
## enabled = true
## bind = "0.0.0.0:14567"
## max_connections = 1024000
## keyfile = "etc/certs/key.pem"
## certfile = "etc/certs/cert.pem"
##}
