Hi @michael_w , thank you for leading me to fix the issue. Maybe for future reference:
I am using following setup:
The RabbitMq servers are in Docker containers. Obviously I was exposing external:internal ports in a wrong way like this
8085:1883 for mqtt
Correct is:
8085:80 for mqtt_ws aka http/web-mqtt on the picture.
Now everything works. Thank you.
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