use participant tracks in update subscription (#49)

@@ -346,9 +346,9 @@ constructor(
         sendRequest(request)
     }
 
-    fun sendUpdateSubscription(sid: String, subscribe: Boolean) {
+    fun sendUpdateSubscription(subscribe: Boolean, vararg participantTracks: LivekitModels.ParticipantTracks) {
         val subscription = LivekitRtc.UpdateSubscription.newBuilder()
-            .addTrackSids(sid)
+            .addAllParticipantTracks(participantTracks.toList())
             .setSubscribe(subscribe)
 
         val request = LivekitRtc.SignalRequest.newBuilder()

@@ -99,7 +99,12 @@ class RemoteTrackPublication(
     fun setSubscribed(subscribed: Boolean) {
         unsubscribed = !subscribed
         val participant = this.participant.get() as? RemoteParticipant ?: return
-        participant.signalClient.sendUpdateSubscription(sid, !unsubscribed)
+        val participantTracks = with(LivekitModels.ParticipantTracks.newBuilder()) {
+            participantSid = participant.sid
+            addTrackSids(sid)
+            build()
+        }
+        participant.signalClient.sendUpdateSubscription(!unsubscribed, participantTracks)
     }
 
     /**

- Subproject commit 01c702cc14462a761d8823e1f8d399b5d20d301e
+ Subproject commit b94955852f2af01542247b28d1602db0e283d7c1