Move the connection check interval of the ManagedClient to the options.

Source/MQTTnet.Extensions.ManagedClient/IManagedMqttClientOptions.cs

@@ -9,6 +9,8 @@ namespace MQTTnet.Extensions.ManagedClient
 
         TimeSpan AutoReconnectDelay { get; }
 
+        TimeSpan ConnectionCheckInterval { get; }
+
         IManagedMqttClientStorage Storage { get; }
     }
 }

Source/MQTTnet.Extensions.ManagedClient/ManagedMqttClient.cs

@@ -206,7 +206,7 @@ namespace MQTTnet.Extensions.ManagedClient
 
                 if (connectionState == ReconnectionResult.StillConnected)
                 {
-                    await Task.Delay(TimeSpan.FromSeconds(1), cancellationToken).ConfigureAwait(false);
+                    await Task.Delay(_options.ConnectionCheckInterval, cancellationToken).ConfigureAwait(false);
                 }
             }
             catch (OperationCanceledException)

Source/MQTTnet.Extensions.ManagedClient/ManagedMqttClientOptions.cs

@@ -9,6 +9,8 @@ namespace MQTTnet.Extensions.ManagedClient
 
         public TimeSpan AutoReconnectDelay { get; set; } = TimeSpan.FromSeconds(5);
 
+        public TimeSpan ConnectionCheckInterval { get; set; } = TimeSpan.FromSeconds(1);
+
         public IManagedMqttClientStorage Storage { get; set; }
     }
 }