Troubleshooting MQTT Connection Issues

General
1

I’ve been working on setting up MQTT on my local instance, but I’m running into some connection issues. Despite following several guides, I can’t seem to get it working properly outside of the MQTT configuration page in Home Assistant. Here’s what I’ve tried so far:

  1. MQTT Configuration Check: I’ve verified that the MQTT integration is correctly configured in Home Assistant. I can publish and listen to messages within the integrations section, which suggests that the basic setup is correct.

  2. Terminal Publishing Issues: When I attempt to publish messages from the terminal using commands like mosquitto_pub, I consistently receive errors such as “Connection Refused” or “Unable to connect (Lookup error.)”. This inconsistency between the Home Assistant interface and the terminal is puzzling.

  3. Log Analysis: The logs indicate an issue with the username or password during the unpwd check. The message “error: received null username or password for unpwd check” suggests that there might be an authentication issue. I’ve double-checked my MQTT broker settings to ensure that the credentials are correctly provided.

  4. Network and Port Configuration: I’ve set up port forwarding and Duck DNS, which are functioning as expected. However, I’m still unable to connect from external devices or through the terminal. This makes me think that there might be a firewall or network configuration issue that’s preventing external connections.

  5. Troubleshooting Steps: I’ve tried resetting the MQTT broker, restarting the Home Assistant service, and even reinstalling the MQTT integration. None of these steps have resolved the issue. I’m considering checking the firewall settings on my router to ensure that the necessary ports are open and not being blocked.

  6. Seeking Assistance: I’m reaching out to the community for help. If anyone has encountered similar issues or has insights into what might be causing this, I’d greatly appreciate any guidance or suggestions. Perhaps there’s a configuration detail I’m overlooking or a specific setting that needs to be adjusted in the MQTT broker.

I’m determined to get this working, but I could really use some expert advice to troubleshoot this further. Thanks in advance for any help you can provide!