diff --git a/ADIS_Csharp/RobotLib/Communication/IPublisherSubscriber.cs b/ADIS_Csharp/RobotLib/Communication/IPublisherSubscriber.cs
index f5ee2ff..5ccbe9b 100644
--- a/ADIS_Csharp/RobotLib/Communication/IPublisherSubscriber.cs
+++ b/ADIS_Csharp/RobotLib/Communication/IPublisherSubscriber.cs
@@ -2,13 +2,18 @@
 
 namespace RobotLib.Communication
 {
-    internal interface IPublisherSubscriber
+    public interface IPublisherSubscriber
     {
         /// <summary>
         /// New message to a subscribed topic arrived.
         /// </summary>
         event EventHandler<SubscribedMsgArrivedEventArgs> NewMessageArrived;
 
+        /// <summary>
+        /// Connection state.
+        /// </summary>
+        bool IsConnected { get; }
+
         /// <summary>
         /// Subscribe to a topic.
         /// </summary>
diff --git a/ADIS_Csharp/RobotLib/Communication/SubscribedMsgArrivedEventArgs.cs b/ADIS_Csharp/RobotLib/Communication/SubscribedMsgArrivedEventArgs.cs
index 10c3d93..9257cfb 100644
--- a/ADIS_Csharp/RobotLib/Communication/SubscribedMsgArrivedEventArgs.cs
+++ b/ADIS_Csharp/RobotLib/Communication/SubscribedMsgArrivedEventArgs.cs
@@ -10,7 +10,7 @@ namespace RobotLib.Communication
         public SubscribedMsgArrivedEventArgs(string topic, string message)
         {
             Topic = topic;
-            Message = data;
+            Message = message;
         }
     }
 }
\ No newline at end of file
diff --git a/ADIS_Csharp/RobotLib/DevBase.cs b/ADIS_Csharp/RobotLib/DevBase.cs
index a1ed02b..3ef7fc9 100644
--- a/ADIS_Csharp/RobotLib/DevBase.cs
+++ b/ADIS_Csharp/RobotLib/DevBase.cs
@@ -1,8 +1,5 @@
-using System;
+using RobotLib.Communication;
 using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace RobotLib
 {
@@ -10,40 +7,40 @@ namespace RobotLib
     {
         protected NLog.Logger log { get; private set; }
 
-        public DevBase(Com com) : this(com, string.Empty) { }
-        public DevBase(Com com, string keyword)
+        public DevBase(IPublisherSubscriber com) : this(com, new List<string>()) { }
+        public DevBase(IPublisherSubscriber com, List<string> interestedTopics)
         {
             log = NLog.LogManager.GetLogger(GetType().ToString());
 
-            Keyword = keyword;
             Com = com;
-            com.MessageReveived += MessageReveived;
+            InterestedTopics = interestedTopics;
+            com.NewMessageArrived += Com_NewMessageArrived;
         }
 
-        protected string Keyword { get; }
-        protected Com Com { get; }
 
-        protected virtual void MessageReveived(object sender, MessageEventArgs e)
+        protected List<string> InterestedTopics { get; }
+        protected IPublisherSubscriber Com { get; }
+
+        protected void Com_NewMessageArrived(object sender, SubscribedMsgArrivedEventArgs e)
         {
-            if (e.Message.StartsWith(Keyword))
+            if (InterestedTopics.Contains(e.Topic))
             {
-                ParseMessage(e.Message);
+                ParseMessage(e.Topic, e.Message);
             }
         }
 
-        protected void SendMessage(string message)
+        protected void SendMessage(string topic, string message)
         {
             if (Com.IsConnected)
             {
-                log.Trace("Esp32> " + message);
-                Com.SendMsg(message);
+                Com.Publish(topic, message);
             }
             else
             {
                 log.Warn("Not connected! Could not send message: " + message);
             }
         }
-        protected virtual void ParseMessage(string message) { }
+        protected virtual void ParseMessage(string fromTopic, string message) { }
 
         public virtual void Refresh() { }
 
diff --git a/ADIS_Csharp/RobotLib/DevSplitFlap/DevSplitFlap.cs b/ADIS_Csharp/RobotLib/DevSplitFlap/DevSplitFlap.cs
new file mode 100644
index 0000000..8ba2e59
--- /dev/null
+++ b/ADIS_Csharp/RobotLib/DevSplitFlap/DevSplitFlap.cs
@@ -0,0 +1,58 @@
+using RobotLib.Communication;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+
+namespace RobotLib.DevSplitFlap
+{
+    internal class DevSplitFlap : DevBase
+    {
+        private const string TOPIC_INITALL = "/splitFlap/cmd/init/";
+        private const string TOPIC_CONFIGURE_SF = "/splitFlap/config/setup/";
+        private const string TOPIC_DISPLAY = "/splitFlap/cmd/display/";
+
+        public event EventHandler<SplitFlapDisplayEventArgs> SplitFlapDisplayChanged;
+
+        public DevSplitFlap(IPublisherSubscriber com) : base(com, new List<string>() { TOPIC_DISPLAY }) { }
+
+        public void InitializeAllSplitflaps()
+        {
+            base.SendMessage(TOPIC_INITALL, "");
+        }
+
+        public void ConfigureSplitflap(int setupId, int hardwareId)
+        {
+            string payload = JsonSerializer.Serialize(new Dictionary<string, string>() { { "setupId", setupId.ToString() }, { "hardwareId", hardwareId.ToString() } });
+            base.SendMessage(TOPIC_CONFIGURE_SF, payload);
+        }
+
+        public void Display(string message)
+        {
+            string payload = JsonSerializer.Serialize(new Dictionary<string, string>() { { "message", message } });
+            base.SendMessage(TOPIC_DISPLAY, payload);
+        }
+
+        protected override void ParseMessage(string fromTopic, string message)
+        {
+            if(fromTopic == TOPIC_DISPLAY)
+            {
+                string parsedMessage = (string)GetValueFromMesage("message", message);
+                if (parsedMessage == null) parsedMessage = "?";
+                SplitFlapDisplayEventArgs eventArgs = new(parsedMessage);
+                SplitFlapDisplayChanged?.Invoke(this, eventArgs);
+            }
+        }
+
+        private object GetValueFromMesage(string parameter,string message)
+        {
+            var data = JsonSerializer.Deserialize<Dictionary<string, object>>(message);
+            object value = null;
+            data.TryGetValue(parameter, out value);
+            return value;
+        }
+    }
+}
diff --git a/ADIS_Csharp/RobotLib/DevSplitFlap/SplitFlapDisplayEventArgs.cs b/ADIS_Csharp/RobotLib/DevSplitFlap/SplitFlapDisplayEventArgs.cs
new file mode 100644
index 0000000..fc9e242
--- /dev/null
+++ b/ADIS_Csharp/RobotLib/DevSplitFlap/SplitFlapDisplayEventArgs.cs
@@ -0,0 +1,12 @@
+namespace RobotLib.DevSplitFlap
+{
+    public class SplitFlapDisplayEventArgs
+    {
+        public string DisplayMessage { get; }
+
+        public SplitFlapDisplayEventArgs(string displayMessage)
+        {
+            DisplayMessage = displayMessage;
+        }
+    }
+}
\ No newline at end of file