MQTT

https://swf.com.tw/?p=1002

https://mosquitto.org/

https://medium.com/%E5%BD%BC%E5%BE%97%E6%BD%98%E7%9A%84-swift-ios-app-%E9%96%8B%E7%99%BC%E6%95%99%E5%AE%A4/ios-x-iot-1-overview-add874221174

https://www.hivemq.com/developers/getting-started/

Verify

You should be able to connect to your IP on the default MQTT port 1883

Windows:

Start the CMD and type:

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netstat -an|find "1883"

Linux:

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netstat -an|grep 1883

You should see a line like the following in the output

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tcp46      0      0  .1883                 .*                    LISTEN