The difference from UDP TCP is also in the connection

image-20220519170656-1.png

MQTT in settings

image-20220519171012-2.png

The default port of MQTT is 1883 because the nodered I demonstrated is installed on my server, so its IP address is local

image-20220519171249-3.png

If you need to verify, please enter the account password of the MQTT server you are connecting to

image-20220519171639-4.png.

image-20220519175429-1.png

 

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