Use single multi-universe sACN receiver

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

main.go

@@ -24,7 +24,7 @@ import (
 type App struct {
 	cfg          *config.Config
 	artReceiver  *artnet.Receiver
-	sacnReceivers []*sacn.Receiver
+	sacnReceiver *sacn.Receiver
 	artSender    *artnet.Sender
 	sacnSender   *sacn.Sender
 	discovery    *artnet.Discovery
@@ -180,27 +180,24 @@ func main() {
 		log.Printf("[artnet] listening addr=%s", addr)
 	}
 
-	// Create sACN receivers (one per universe)
+	// Create sACN receiver for all source universes
 	sacnUniverses := cfg.SACNSourceUniverses()
 	if len(sacnUniverses) > 0 {
 		var iface *net.Interface
 		if *sacnInterface != "" {
 			iface, _ = net.InterfaceByName(*sacnInterface)
 		}
-		for _, u := range sacnUniverses {
-			receiver, err := sacn.NewUniverseReceiver(iface, u)
+		receiver, err := sacn.NewMultiUniverseReceiver(iface, sacnUniverses)
 		if err != nil {
-				log.Printf("[sacn] failed to create receiver for universe %d: %v", u, err)
-				continue
+			log.Fatalf("[sacn] failed to create receiver: %v", err)
 		}
 		receiver.SetHandler(func(src *net.UDPAddr, pkt interface{}) {
 			if data, ok := pkt.(*sacn.DataPacket); ok {
 				app.HandleSACN(src, data)
 			}
 		})
-			app.sacnReceivers = append(app.sacnReceivers, receiver)
+		app.sacnReceiver = receiver
 		receiver.Start()
-		}
 		log.Printf("[sacn] listening universes=%v", sacnUniverses)
 	}
 
@@ -243,8 +240,8 @@ func main() {
 	if app.artReceiver != nil {
 		app.artReceiver.Stop()
 	}
-	for _, r := range app.sacnReceivers {
-		r.Stop()
+	if app.sacnReceiver != nil {
+		app.sacnReceiver.Stop()
 	}
 	discovery.Stop()
 }