Zwave-JS-UI can not connect to MQTT

[fjuppe]

Hello,
I am a complete newbie to setting things up in Linux. I have just installed a new Aeon Z-wave USB stick on my RPi 4B+ running standard Debian version 11. I have manage to set up Zwave-JS-UI, my USB stick is working, I have included one switch.

I also run Domoticz on the same RPi where I want to control all Z-wave devices. I have followed the installation guidelines but I dont get any devices under the Domoticz "MQTT Auto Discovery Client Gateway with LAN interface". Domoticz log says "Z-Wave: Connecting to <RPi_IP>:1883" without any error.

In Zwave-JS-UI I get the below error when debugging. I suspect this is causing the problem but I dont have knowledge to solve this.
Please give me some commands to let me be able to get this working. If you need more info, please give detailed instructions how to obtain this since I am not so familiar with Linux. Ie where to check for MQTT client details......?
Thanks in advance for your help!

2023-09-26 10:03:50 INFO MQTT: MQTT client reconnecting
2023-09-26 10:03:50 ERROR MQTT: Mqtt client error Connection refused: Not authorized
ErrorWithReasonCode: Connection refused: Not authorized
.........
2023-09-26 10:03:50 INFO MQTT: MQTT client closed

[waltervl]

Check the settings for Mosquitto on mosquito V2 and higher, allow anonymous login if you did not set a user account for Mosquitto. See the MQTT wiki page https://www.domoticz.com/wiki/MQTT#Gene ... 2.0_and_up