1.下载xmeter-net/mqtt-jmeter/releases插件放到jmeter/exit目录下
https://github.com/xmeter-net/mqtt-jmeter/releases
2.添加线程组
3. 添加发布请求-选中线程组，点击右键，添加》Sample---MQTT Connect 
4.自已搭建得windows得mosquitto 服务，选中mosquitto安装目录运行cmd ，订阅者mosquitto_sub -v -t test_topic mosquitto -c mosquitto.conf 启动服务
4.订阅者已看到发布得信息
