I have a TP-Link TP-PA8630 PLA/Wi-Fi AP. I have given the 2.4GHz channel on that adapter a different SSID than the Router. If I connect to that SSID using a mobile, I am able to ping, and see (using the WiFi Man app), the wireless devices which are not connected to that SSID but to the main router SSID. A media streamer connected to the main SSID can be controlled by an app on the phone connected to the AP SSID. Is this expected behaviour i.e. apparently communicating across SSID's? It's certainly useful, as I was having no luck at all getting my Android phone to switch to the strongest signal when both access point and router had the same SSID.