do fast scan for remote players on startup

backend/app.go

@@ -153,7 +153,7 @@ func StartupApp(appName, displayAppName, appVersion, appVersionTag, latestReleas
 	}
 
 	// Periodically scan for remote players
-	go a.PlaybackManager.ScanRemotePlayers(a.bgrndCtx, 5 /*waitSec*/)
+	go a.PlaybackManager.ScanRemotePlayers(a.bgrndCtx, true /*fastScan*/)
 	go func() {
 		t := time.NewTicker(5 * time.Minute)
 		for {
@@ -162,7 +162,7 @@ func StartupApp(appName, displayAppName, appVersion, appVersionTag, latestReleas
 				t.Stop()
 				return
 			case <-t.C:
-				a.PlaybackManager.ScanRemotePlayers(a.bgrndCtx, 10 /*waitSec*/)
+				a.PlaybackManager.ScanRemotePlayers(a.bgrndCtx, false)
 			}
 		}
 	}()

backend/playbackmanager.go

@@ -96,7 +96,15 @@ func (p *PlaybackManager) addOnTrackChangeHook() {
 	})
 }
 
-func (p *PlaybackManager) ScanRemotePlayers(ctx context.Context, waitSec int) {
+func (p *PlaybackManager) ScanRemotePlayers(ctx context.Context, fastScan bool) {
+	if fastScan {
+		p.scanRemotePlayers(ctx, 1 /*waitSec*/)
+		// continue to slow scan to detect players that take longer to respond
+	}
+	p.scanRemotePlayers(ctx, 10 /*waitSec*/)
+}
+
+func (p *PlaybackManager) scanRemotePlayers(ctx context.Context, waitSec int) {
 	devices, _ := device.SearchMediaRenderers(ctx, waitSec, services.AVTransport, services.RenderingControl)
 
 	var discovered []remotePlayer