Zwave2mqtt. MQTT client closed

I have zwave2mqtt up and running and have added devices. I have Mosquitto up and running.

Mosquitto log says:
New connection from “ip adress” on port 1883.

However… In the zwave2mqtt log I get:
z2m:Mqtt MQTT client reconnecting
z2m:Mqtt MQTT client closed

Broker does not have a specified username and password as I am running Home Assistant OS and the guide said it was not needed.

I have created a systemwide user with password. This is the one I entered in to zwave2mqtt UI config.

Anyone able to point me in the right direction?

Edit:
Name: zwave
Host url: mqtt://broker
Port: 1883
Reconnect period: 60000
Prefix: homeassistant
Qos: 0

Retain set to “on”
Auth set to “on”