Hello,
I am facing a problem connecting my node red mqtt to the adafruit. I have configured everything according to this link however it fails to properly connect. The connection icon persists on connecting but doesn't connect.
Do you have a working MQTT broker installed somewhere on your computer/pi/network? If not, you'll need one if you have then you should test/verify it is working with "MQTT explorer" (search Google).
This thread is a duplicate of Connecting Adafruit to the Mqtt node
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