-Find the IP of the Sonos equipment you wish to turn off the Wi-Fi connection.
-To check the status of the Wi-Fi link http://<sonos_ip>:1400/status/ifconfig
-Ath0 should be showing if it is not the Wi-Fi interface is already disabled
-To disable the Wi-Fi Link http://<sonos_ip>:1400/wifictrl?wifi=persist-off
-An to turn back on http://<sonos_ip>:1400/wifictrl?wifi=on