Tammota and Mqtt in Openremote

Hello, I have installed Openremote, published in the manager on port 1883, service user, but when I configure my Sononff switch from Tsmota with the latest firmware, it does not connect.

My open remote is in the cloud and my smartswitch is at home, does that affect it?
I test the connection with mqtt-fx, it connects well, I publish a message and the connection is closed, is this correct?

I also can’t find clear information on how to add a new asset, does anyone have a step-by-step guide on how to do it?

Thanks!