Roku Support
posted this on October 16, 2012 13:28
If you see a “No Devices Found” message on the “Select a Player” screen, your Roku player was not detected over your network.
First, try going through Network setup to wake your Roku player on your home network:
After you have successfully reconnected to your network, tap “Refresh List” on the Roku iOS app or “Refresh” in the Android app a few times.
If the app still does not show your Roku player, try powering down your Roku player, mobile device and router. Restart all devices, wait 3 minutes, then launch the Roku mobile app again.