I donât use HA so no idea there, but my Mosquitto runs with Node-red and Tasmota following this guide, using the config file.
Maybe youâve already done this, but just in case.
Unfortunately my Smartthings MQTT driver canât subscribe to a port which is not 1883, but for running MQTT from iHost it performs OK.
Iâve deleted the Mosquito Broker docker on my iHost now but did check it worked. Canât check now but from memory that was the port. I have a broker on my RP4/Home-Assistant: you just need to create a local only user for MQTT clients to log in but I can confirm current HA Operating system and current iHost work with Mosquito Broker Add On in Home Assistant as that is my current setup. In theory I think you can create a log in for each MQTT client but I got bored doing that. I donât know why your iHost broker doesnât work: it did for me with a very similar setup. Maybe something to do with an iHost firmware update. It was quite a while ago I tested it.