Hey. I took a look at that thread but I think the customer stumbled across a fix by effectively rebooting the WAP while changing various settings, and the Rachio connected. This definitely isn’t a root cause and I have confirmed that the setting doesn’t change anything.
The root cause is the DHCP broadcast packet that the Rachio is sending out; albeit somehow coupled with something on the TP-Link WAPs that don’t like doing that across VLANs.