Nuki Ultra - MQTT stopped working

Discussion
1

Hi,
Over the past few days, my Nuki Ultra was successfully connected to Home Assistant via MQTT. However, since this morning, it has stopped working and now reports that it cannot connect.
I’m using a fixed IP for HA which never changes.
I deleted the MQTT connection in the Nuki app and attempted to set it up again, but it fails with the message: “The action could not be executed.”

I’m using the Mosquitto broker in Home Assistant. Using MQTT Explorer I am able to connect to MQTT broker and also can see the Nuki, which shows connected = false.

Screenshot 2025-07-28 at 13.34.18
Screenshot 2025-07-28 at 13.34.182032×1230 229 KB

I’ve tried restarting the broker as well as Home Assistant itself, but neither has resolved the issue.

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Any ideas or suggestions would be greatly appreciated.

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Update: After a few hours, I tried again and was finally able to activate MQTT in the Nuki app without changing anything at all, either in the Nuki app or in Home Assistant.

This is now the second time my Nuki Ultra has lost its MQTT connection to HA. It doesn’t seem very stable at the moment, so I’m hoping a future update will improve reliability.

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Same here with brand new Nuki Pro. Eventually it drops the connection and comes back on after some time. I’ve got it connected via thread on my HomePod mini. @itsthomas did you notice any improvements since you posted last time?

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