# Microsoft.AspNetCore.SignalR.Protocol

``` diff
 namespace Microsoft.AspNetCore.SignalR.Protocol {
+    public sealed class AckMessage : HubMessage {
+        public AckMessage(long sequenceId);
+        public long SequenceId { get; set; }
+    }
     public static class HubProtocolConstants {
+        public const int AckMessageType = 8;
+        public const int SequenceMessageType = 9;
     }
+    public sealed class SequenceMessage : HubMessage {
+        public SequenceMessage(long sequenceId);
+        public long SequenceId { get; set; }
+    }
 }
```

