MQTT discovery Supla-PL problem

Hello. I have devices from Poland running Supla software that share data based on MQTT discovery. I’m trying to integrate them with Homey Self-Server. I have an external broker, Mosquitto. I tried to do it this way. I installed the MQTT Client, and for example, Tasmota devices can be clearly seen which ones are added to this client. They load in the Tasmota MQTT application. Generally, it doesn’t seem to subscribe to the Supla topic at all, only to the Topic Tele where the Tasmota devices are located. Can anyone suggest something?

Maybe this tutorial gets you going

So, am I looking correctly? To connect an external MQTT broker, I need to buy an additional physical device module?

So, it is installed on Homey this way, no external needed.

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I managed to do it partially because when I add a virtual device in conjunction with the mQTT hub, the command even arrives when I send setTopic to the mQTT server where I have my suppl. From what I’ve read, the problem is the sending format—retain. I see the message arrives in mQTT Explorer, but nothing happens. The problem is solved when I do it using Flow Advanced, and I send it anyway, and then everything is fine.