Not sure how widely available this feature is, but the unifi controller software for the popular Ubiquiti APs lets you bind individual client devices to specific APs such that they can only connect to the ones you choose.
replyI had to solve a similar issue for some crap IoT lights that would join the incorrect AP after a power cut every time.
> https://community.ui.com/questions/Lock-Client-to-Specific-A...
for static clients that works well, though you can usually set a min rssi and get the same benefit without so much clicking.
replyThat works for fixed devices like a TV, but also has the effect of shrinking the effective coverage area of the wireless network as a whole.
replyThat can mean that the portable wifi speaker-widget (which itself doesn't need much bandwidth) might go from working fine on the back deck or well-enough about anywhere else in the yard, to not working at all outside.