I'm all Mac here, But the devices are IOS and will only link to a phone. For my 3rd gen, cast pod I can only link through a phone to patch to my headset. My head set links using Facebook.
My router is also phone linked but runs on android, also ios. We are using a borrowed iPhone to control all right now. The router only needed to be set up and turned on, same with headset. The cast pod, however requires more phone every time I use it.
I can't keep the phone forever, thus my question on the old #2 iPad.