diff --git a/Pilz.Net/Api/ApiMessage.cs b/Pilz.Net/Api/ApiMessage.cs
index 64486fc..c33eb9f 100644
--- a/Pilz.Net/Api/ApiMessage.cs
+++ b/Pilz.Net/Api/ApiMessage.cs
@@ -2,4 +2,9 @@
 
 public abstract class ApiMessage
 {
+    private class EmptyApiMessage : ApiMessage { }
+
+    public ApiMessage Empty { get; } = new EmptyApiMessage();
+
+    public bool IsEmpty => this is EmptyApiMessage;
 }
diff --git a/Pilz.Net/Api/ApiResponse.cs b/Pilz.Net/Api/ApiResponse.cs
index 2af962b..0ccee85 100644
--- a/Pilz.Net/Api/ApiResponse.cs
+++ b/Pilz.Net/Api/ApiResponse.cs
@@ -5,9 +5,11 @@ namespace Pilz.Net.Api;
 public record class ApiResponse(
     HttpStatusCode StatusCode)
 {
+    public bool IsOk => StatusCode != HttpStatusCode.OK;
+
     public void EnsureOk()
     {
-        if (StatusCode != HttpStatusCode.OK)
+        if (!IsOk)
             throw new Exception("Api return is not ok!");
     }
 }
diff --git a/Pilz.Net/Api/ApiResponse{T}.cs b/Pilz.Net/Api/ApiResponse{T}.cs
index f015dac..7f26eb9 100644
--- a/Pilz.Net/Api/ApiResponse{T}.cs
+++ b/Pilz.Net/Api/ApiResponse{T}.cs
@@ -8,10 +8,13 @@ public record class ApiResponse<T>(
     T? Message)
     where T : ApiMessage
 {
+    [MemberNotNullWhen(true, nameof(Message))]
+    public bool IsOk => StatusCode == HttpStatusCode.OK && Message is not null;
+
     [MemberNotNull(nameof(Message))]
     public void EnsureOk()
     {
-        if (StatusCode != HttpStatusCode.OK || Message is null)
+        if (!IsOk)
             throw new Exception("Api return is not ok!");
     }
 }
diff --git a/Pilz.Net/ConnectionManagerBase.cs b/Pilz.Net/ConnectionManagerBase.cs
index 312f752..72dda84 100644
--- a/Pilz.Net/ConnectionManagerBase.cs
+++ b/Pilz.Net/ConnectionManagerBase.cs
@@ -7,7 +7,7 @@ namespace Pilz.Net;
 public abstract class ConnectionManagerBase(int port)
 {
     private const int HEADER_LENGTH = 12;
-
+    
     private bool listening = false;
     private readonly Dictionary<int, Dictionary<int, byte[]>> dicData = [];