I think my problem with the Aeotec Nano is similar as I haven't excluded it from the Raspberry Pi with Aeotec USB stick yet. I have re-purposed the Pi for RetroPie.
My Aeotec Smartswitch 6 is working from about 10m from the ST Hub. The Multi Senor is about the same distance about a meter away from the switch. My Nano dimmer that I can't connect is in the room below those two.
The dimmer is flickery with my downlights so I'll probably go Aeotec Dual switch if/when I but some more.
I assume the switch is used to action/trigger the Aeotec rather than cut the power to it. Is that right? The handler I was going to use for the dimmer is on github under: