How?
I delete mqtt broker from /etc/openhab2/services/mqtt.cfg and OH logview continues to write error about old broker. Even after reboots
Following the post I have linked you should have found:
pid:org.openhab.mqtt
Put that as first line in your mqtt.cfg, then a restart of openHAB may be needed.
If it still does not work:
delete file userdata/config/org/openhab/mqtt.config and restart openHAB.
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