@TBDwarf Caching is not the issue here. The problem is that the camera is requesting a URL that does not exist. The DNS server returns NXDOMAIN to these queries as it should and the camera goes on...

In order to make this more generic I've added these rules to my AdGuard Home custom filters # Tapo Camera...

@Celico I just mapped the broken relay URLs to use1-relay-dcipc.i.tplinknbu.com and it works fine....

@Weavey Both my cameras started requesting non existent URLs again every six seconds. If you have the capability, do a DNS rewrite of the bad URLs to this domain : use1-relay-dcipc.i.tplinknbu.com

Still getting multiple router connect messages with the latest firmware

@lukass2000 From my reading of the articals it can create loops all in on its own even without a WiFi connection. It's to do with how it uses the STP and multicast when it's looking for compatible...