diff --git a/Assets/Resources/Prefabs/UI/PRF_InputTopicItem.prefab b/Assets/Resources/Prefabs/UI/PRF_InputTopicItem.prefab
index c93805cb..d739036b 100644
--- a/Assets/Resources/Prefabs/UI/PRF_InputTopicItem.prefab
+++ b/Assets/Resources/Prefabs/UI/PRF_InputTopicItem.prefab
@@ -251,6 +251,7 @@ GameObject:
   - component: {fileID: 6549079342170574329}
   - component: {fileID: 8772786093202997941}
   - component: {fileID: 8501740602063653259}
+  - component: {fileID: 1292074844791121958}
   m_Layer: 0
   m_Name: InputField_Topic
   m_TagString: Untagged
@@ -417,6 +418,19 @@ MonoBehaviour:
   isAlert: 0
   m_InputValidator: {fileID: 0}
   m_ShouldActivateOnSelect: 1
+--- !u!114 &1292074844791121958
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 5041442594409627906}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 5cfbc3180aa0867408d6521529e5cac4, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  inputField: {fileID: 0}
 --- !u!1 &5562854965458769467
 GameObject:
   m_ObjectHideFlags: 0
diff --git a/Assets/Resources/Prefabs/UI/PRF_MQTTConnectionItem.prefab b/Assets/Resources/Prefabs/UI/PRF_MQTTConnectionItem.prefab
index eec069f9..ad888827 100644
--- a/Assets/Resources/Prefabs/UI/PRF_MQTTConnectionItem.prefab
+++ b/Assets/Resources/Prefabs/UI/PRF_MQTTConnectionItem.prefab
@@ -942,6 +942,7 @@ GameObject:
   - component: {fileID: 1294127454145776225}
   - component: {fileID: 451971561218025839}
   - component: {fileID: 4531525069399822389}
+  - component: {fileID: 3782032704331303633}
   m_Layer: 0
   m_Name: InputField_Port
   m_TagString: Untagged
@@ -1108,6 +1109,19 @@ MonoBehaviour:
   isAlert: 0
   m_InputValidator: {fileID: 0}
   m_ShouldActivateOnSelect: 1
+--- !u!114 &3782032704331303633
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 2436487502178914535}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 6f95cd07bc2246945965157693796194, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  inputField: {fileID: 0}
 --- !u!1 &3156314644122750241
 GameObject:
   m_ObjectHideFlags: 0
@@ -2566,6 +2580,7 @@ GameObject:
   - component: {fileID: 6749344978886352018}
   - component: {fileID: 2032036743421240120}
   - component: {fileID: 7558723559091652677}
+  - component: {fileID: 8720815484175462745}
   m_Layer: 0
   m_Name: InputField_Domain
   m_TagString: Untagged
@@ -2732,3 +2747,16 @@ MonoBehaviour:
   isAlert: 0
   m_InputValidator: {fileID: 0}
   m_ShouldActivateOnSelect: 1
+--- !u!114 &8720815484175462745
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 8829135613240903342}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 318ad98d4b818194da00221ee69745cd, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  inputField: {fileID: 0}
diff --git a/Assets/Scripts/Studio/UI/Elements/UI_MQTTConnection.cs b/Assets/Scripts/Studio/UI/Elements/UI_MQTTConnection.cs
index d1d00857..45eee9e5 100644
--- a/Assets/Scripts/Studio/UI/Elements/UI_MQTTConnection.cs
+++ b/Assets/Scripts/Studio/UI/Elements/UI_MQTTConnection.cs
@@ -60,13 +60,23 @@ namespace Studio.UI
             onMQTTTest?.Invoke();
 
             var domain = InputField_Domain.text;
-            var port = int.Parse(InputField_Port.text);
+            if (string.IsNullOrWhiteSpace(domain))
+            {
+                return;
+            }
+            if (!int.TryParse(InputField_Port.text, out var port))
+            {
+                return;
+            }
 
             List<string> topics = new();
             foreach (UI_InputTopicItem item in inputTopicItems)
             {
                 var topic = item.InputField_Topic.text;
-                topics.Add(topic);
+                if (!string.IsNullOrWhiteSpace(topic))
+                {
+                    topics.Add(topic);
+                }
             }
             var tmpClient = new TemporaryMQTTClient(domain, port, topics, OnTopicTest, OnConnectedClient, OnErrorClient);
             panel_MQTTTestResult.Open(domain, port.ToString());
diff --git a/Assets/Scripts/Studio/UI/InputField.meta b/Assets/Scripts/Studio/UI/InputField.meta
new file mode 100644
index 00000000..e0272e9f
--- /dev/null
+++ b/Assets/Scripts/Studio/UI/InputField.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 01921bb75417df441acf53da6992d294
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Scripts/Studio/UI/InputField/EnglishInputFieldValidator.cs b/Assets/Scripts/Studio/UI/InputField/EnglishInputFieldValidator.cs
new file mode 100644
index 00000000..262b38dc
--- /dev/null
+++ b/Assets/Scripts/Studio/UI/InputField/EnglishInputFieldValidator.cs
@@ -0,0 +1,15 @@
+namespace Studio.UI
+{
+    public class EnglishInputFieldValidator : InputFieldValidator
+    {
+        protected override char ValidateInput(string text, int charIndex, char addedChar)
+        {
+            if ((addedChar >= 'A' && addedChar <= 'Z') || (addedChar >= 'a' && addedChar <= 'z'))
+            {
+                return addedChar;
+            }
+
+            return '\0';
+        }
+    }
+}
diff --git a/Assets/Scripts/Studio/UI/InputField/EnglishInputFieldValidator.cs.meta b/Assets/Scripts/Studio/UI/InputField/EnglishInputFieldValidator.cs.meta
new file mode 100644
index 00000000..eacd99c4
--- /dev/null
+++ b/Assets/Scripts/Studio/UI/InputField/EnglishInputFieldValidator.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 5cfbc3180aa0867408d6521529e5cac4
\ No newline at end of file
diff --git a/Assets/Scripts/Studio/UI/InputField/InputFieldValidator.cs b/Assets/Scripts/Studio/UI/InputField/InputFieldValidator.cs
new file mode 100644
index 00000000..be493a07
--- /dev/null
+++ b/Assets/Scripts/Studio/UI/InputField/InputFieldValidator.cs
@@ -0,0 +1,20 @@
+using TMPro;
+using UnityEngine;
+using XRLib.UI;
+
+namespace Studio.UI
+{
+    [RequireComponent(typeof(TMP_InputField))]
+    public abstract class InputFieldValidator : UIBase
+    {
+        public TMP_InputField inputField;
+
+        void Awake()
+        {
+            inputField = GetComponent<TMP_InputField>();
+            inputField.onValidateInput += ValidateInput;
+        }
+
+        protected abstract char ValidateInput(string text, int charIndex, char addedChar);
+    }
+}
diff --git a/Assets/Scripts/Studio/UI/InputField/InputFieldValidator.cs.meta b/Assets/Scripts/Studio/UI/InputField/InputFieldValidator.cs.meta
new file mode 100644
index 00000000..4adf497b
--- /dev/null
+++ b/Assets/Scripts/Studio/UI/InputField/InputFieldValidator.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 03b149247b27102428968cb5df010774
\ No newline at end of file
diff --git a/Assets/Scripts/Studio/UI/InputField/NumericDotInputFieldValidator.cs b/Assets/Scripts/Studio/UI/InputField/NumericDotInputFieldValidator.cs
new file mode 100644
index 00000000..bd325dff
--- /dev/null
+++ b/Assets/Scripts/Studio/UI/InputField/NumericDotInputFieldValidator.cs
@@ -0,0 +1,15 @@
+namespace Studio.UI
+{
+    public class NumericDotInputFieldValidator : InputFieldValidator
+    {
+        protected override char ValidateInput(string text, int charIndex, char addedChar)
+        {
+            if (char.IsDigit(addedChar) || addedChar == '.')
+            {
+                return addedChar;
+            }
+
+            return '\0';
+        }
+    }
+}
diff --git a/Assets/Scripts/Studio/UI/InputField/NumericDotInputFieldValidator.cs.meta b/Assets/Scripts/Studio/UI/InputField/NumericDotInputFieldValidator.cs.meta
new file mode 100644
index 00000000..2339ace3
--- /dev/null
+++ b/Assets/Scripts/Studio/UI/InputField/NumericDotInputFieldValidator.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 318ad98d4b818194da00221ee69745cd
\ No newline at end of file
diff --git a/Assets/Scripts/Studio/UI/InputField/NumericInputFieldValidator.cs b/Assets/Scripts/Studio/UI/InputField/NumericInputFieldValidator.cs
new file mode 100644
index 00000000..1fb91d1c
--- /dev/null
+++ b/Assets/Scripts/Studio/UI/InputField/NumericInputFieldValidator.cs
@@ -0,0 +1,15 @@
+namespace Studio.UI
+{
+    public class NumericInputFieldValidator : InputFieldValidator
+    {
+        protected override char ValidateInput(string text, int charIndex, char addedChar)
+        {
+            if (char.IsDigit(addedChar))
+            {
+                return addedChar;
+            }
+
+            return '\0';
+        }
+    }
+}
diff --git a/Assets/Scripts/Studio/UI/InputField/NumericInputFieldValidator.cs.meta b/Assets/Scripts/Studio/UI/InputField/NumericInputFieldValidator.cs.meta
new file mode 100644
index 00000000..a28da226
--- /dev/null
+++ b/Assets/Scripts/Studio/UI/InputField/NumericInputFieldValidator.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 6f95cd07bc2246945965157693796194
\ No newline at end of file