code: func Advertise(ctx context.Context, advertise discovery.Advertiser) {
  	go func() {
  		select {
  		case <-time.After(AdvertiseBootDelay):
  			discovery.Advertise(ctx, advertise, RelayRendezvous)
  		case <-ctx.Done():
  		}
  	}()
  }
docs: // Advertise advertises this node as a libp2p relay.