[noselasd]

Doesn't most consumer wifi routers do that by now by default ?

[foxfluff]

I don't know if it hops when nobody is connected but I certainly found mine to hop while I'm connected. It'd hop around until it finds a channel where wifi doesn't work, and then stays there.

I had to force a channel..

[justshowpost]

Scanning for least congested freq is very common, but it only performed right before upping of AP iface and no else. So sweeping the band with AP is very impractical.

[blobbers]

some of the higher end routers have an extra radio specifically for scanning. Ie: see Cisco

https://meraki.cisco.com/product/wi-fi/indoor-access-points/...

This thing will scan channels, as well as perform security operations.