https://www.emqx.com/en/mqtt/public-mqtt5-broker

Broker:broker.emqx.io

port：1883


Publish:Training0322
{"value" : [66],"value(1)" : [true]}


Subscription:Subscribe0322
{"value2" : [123],"value2(1)" : [1]}



https://docs.we-con.com.cn/bin/view/PIStudio/08.Basic%20Function/#HMQTT