ref #230 Limiting the growth of PendingMessagesQueue to a configurable value. it will only store X lated messages, 250 by default.

https://github.com/chkr1011/MQTTnet/issues/230

Frameworks/MQTTnet.NetStandard/Server/IMqttServerOptions.cs

@@ -5,6 +5,8 @@ namespace MQTTnet.Server
     public interface IMqttServerOptions
     {
         int ConnectionBacklog { get; }
+        int MaxPendingMessagesPerClient { get; }
+
         TimeSpan DefaultCommunicationTimeout { get; }
 
         Action<MqttConnectionValidatorContext> ConnectionValidator { get; }