There appears to be an issue with the addon since the version 6 upgrade. NED-Kelly’s voltronic inverter interface (GitHub - ned-kelly/docker-voltronic-homeassistant: Programmatically read data from your Voltronic, Axpert, Mppsolar PIP, Voltacon, Effekta etc Inverter and send it to Home Assistant via MQTT - Works with RS232 & USB!) is not working. I raised it there, and some users found that reverting to an older Home Assistant version fixed the problem.
Please help.
The Mosquitto mqtt addon is still working for me and many others. So it is an issue with the 3rd party integration.
The biggest change was no longer allowing anonymous mqtt logins. So you probably just have to set up a user and password.
Or possibly this:
Thanks for the reply. I’ve tried those options. With no luck. I restored an older MQTT and it works again. I also logged an issue on Github, and it appears others are having the issue as well.