I understand there's no hope of this ever being fixed, just posting here
to save some future person (maybe me again!) the hours it took to figure
this out (https://xkcd.com/979/)...

The Squeezebox Duet receiver cannot join a WiFi network with 802.11r
enabled. Your WiFi router firmware may call it by other names like "fast
BSS transition" or "fast roaming".

The incompatibility is surprising, because the Duet controller _does_
support 802.11r, and will happily control other Squeezeboxes devices on
the network with this WiFi feature enabled. The duet receiver, however,
presumably uses a different WiFi chip and driver stack, and will get
stuck on the yellow light indicating no network connection. The receiver
in this state has no way to be probed for logs or other error
indicators. Eventually debugging the problem will show that DHCP
requests are not being made, and in fact the device cannot even join the
WiFi network.

Hopefully this post will save someone some time. The only solution is to
disable 802.11r on the network you wish to use with the Squeezebox
receiver, or set up a separate WiFi SSID just for its use without
802.11r.


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