diff --git a/src/ScadaLink.Commons/Types/DataConnections/OpcUaEndpointConfig.cs b/src/ScadaLink.Commons/Types/DataConnections/OpcUaEndpointConfig.cs
new file mode 100644
index 0000000..06f6f63
--- /dev/null
+++ b/src/ScadaLink.Commons/Types/DataConnections/OpcUaEndpointConfig.cs
@@ -0,0 +1,24 @@
+namespace ScadaLink.Commons.Types.DataConnections;
+
+public sealed class OpcUaEndpointConfig
+{
+    // Connection
+    public string EndpointUrl { get; set; } = "";
+    public OpcUaSecurityMode SecurityMode { get; set; } = OpcUaSecurityMode.None;
+    public bool AutoAcceptUntrustedCerts { get; set; } = true;
+
+    // Timing
+    public int SessionTimeoutMs { get; set; } = 60000;
+    public int OperationTimeoutMs { get; set; } = 15000;
+
+    // Subscription
+    public int PublishingIntervalMs { get; set; } = 1000;
+    public int SamplingIntervalMs { get; set; } = 1000;
+    public int QueueSize { get; set; } = 10;
+    public int KeepAliveCount { get; set; } = 10;
+    public int LifetimeCount { get; set; } = 30;
+    public int MaxNotificationsPerPublish { get; set; } = 100;
+
+    // Heartbeat (optional)
+    public OpcUaHeartbeatConfig? Heartbeat { get; set; }
+}
diff --git a/src/ScadaLink.Commons/Types/DataConnections/OpcUaHeartbeatConfig.cs b/src/ScadaLink.Commons/Types/DataConnections/OpcUaHeartbeatConfig.cs
new file mode 100644
index 0000000..1882a11
--- /dev/null
+++ b/src/ScadaLink.Commons/Types/DataConnections/OpcUaHeartbeatConfig.cs
@@ -0,0 +1,7 @@
+namespace ScadaLink.Commons.Types.DataConnections;
+
+public sealed class OpcUaHeartbeatConfig
+{
+    public string TagPath { get; set; } = "";
+    public int MaxSilenceSeconds { get; set; } = 30;
+}
diff --git a/src/ScadaLink.Commons/Types/DataConnections/OpcUaSecurityMode.cs b/src/ScadaLink.Commons/Types/DataConnections/OpcUaSecurityMode.cs
new file mode 100644
index 0000000..8bec937
--- /dev/null
+++ b/src/ScadaLink.Commons/Types/DataConnections/OpcUaSecurityMode.cs
@@ -0,0 +1,8 @@
+namespace ScadaLink.Commons.Types.DataConnections;
+
+public enum OpcUaSecurityMode
+{
+    None,
+    Sign,
+    SignAndEncrypt
+}
diff --git a/src/ScadaLink.Commons/Types/Flattening/ValidationResult.cs b/src/ScadaLink.Commons/Types/Flattening/ValidationResult.cs
index 34997b4..1465801 100644
--- a/src/ScadaLink.Commons/Types/Flattening/ValidationResult.cs
+++ b/src/ScadaLink.Commons/Types/Flattening/ValidationResult.cs
@@ -61,5 +61,6 @@ public enum ValidationCategory
     TriggerOperandType,
     OnTriggerScriptNotFound,
     CrossCallViolation,
-    MissingMetadata
+    MissingMetadata,
+    ConnectionConfig
 }