mqtt发布服务和订阅信息命令

发布订阅服务：root@dell-PowerEdge-R740:/home/dell# mosquitto_sub -d -h 192.168.101.63 -p 1883 -t "lbmqtt" -u "root" -P "root" -v

发送消息：mosquitto_pub -h 192.168.101.63 -p 1883 -t "lbmqtt" -u "root" -P "root" -m "Hello, MQTT!"