MQTT issues

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I am trying to connect a meter to my Home Assistance via MQTT - should be as simple as enabling this option in the setup and putting correct credentials. All that was done but there is no single topic that was sent by ESP32 device. I have few dozen other devices hooked up to HA system and all is good. Credentials are clearly correct. I used the MQTT monitoring SW and there are not topics there either.
Enabling logging does not help much - no info around MQTT communication in the log file. I used the latest official SW package as well as tried the latest rolling SW. All the same - no MQTT topics sent out.
Any suggestion how to debug this issue further?

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Never mind. So embarrassing - missed "mqtt://" in the fill broker address. All is good. Sorry for a non-issue discussion