https://developers.google.com/android/reference/com/google/android/gms/nearby/connection/DiscoveryOptions
DiscoveryOptions | Google Play services | Google for Developers
google play servicesdevelopers
https://developers.google.com/android/reference/com/google/android/gms/nearby/connection/DiscoveryOptions.Builder
DiscoveryOptions.Builder | Google Play services | Google for Developers
google play servicesbuilderdevelopers