diff --git a/punchnet/Core/VPNManager.swift b/punchnet/Core/VPNManager.swift
index d809c76..ccd9ff6 100644
--- a/punchnet/Core/VPNManager.swift
+++ b/punchnet/Core/VPNManager.swift
@@ -10,6 +10,10 @@ import NetworkExtension
 import SwiftUI
 import Observation
 
+enum VPNManagerError: Error {
+    case disconnected
+}
+
 // vpn管理类
 @Observable
 class VPNManager {
@@ -38,10 +42,10 @@ class VPNManager {
         NSLog("enable vpn with options: \(options)")
         let manager = try await loadAndCreateProviderManager()
         try await manager.loadFromPreferences()
-        self.manager = manager
-        
         self.addVPNStatusObserver(manager)
         try manager.connection.startVPNTunnel(options: options)
+        
+        self.manager = manager
     }
     
     // 关闭vpn
@@ -52,6 +56,29 @@ class VPNManager {
         
         try await manager.loadFromPreferences()
         manager.connection.stopVPNTunnel()
+        self.manager = nil
+    }
+    
+    func sendMessage(_ message: Data) async throws -> Data {
+        guard let session = self.manager?.connection as? NETunnelProviderSession else {
+            throw VPNManagerError.disconnected
+        }
+        
+        guard session.status == .connected || session.status == .connecting else {
+            throw VPNManagerError.disconnected
+        }
+        
+        return try await withCheckedThrowingContinuation { continuation in
+            do {
+                try session.sendProviderMessage(message) { responseData in
+                    // 收到响应，恢复异步挂起点
+                    continuation.resume(returning: responseData ?? Data())
+                }
+            } catch {
+                // 发送失败，抛出错误
+                continuation.resume(throwing: error)
+            }
+        }
     }
     
     // MARK: - Private Methods
diff --git a/punchnet/Views/AppContext.swift b/punchnet/Views/AppContext.swift
index 09cb48d..c58b393 100644
--- a/punchnet/Views/AppContext.swift
+++ b/punchnet/Views/AppContext.swift
@@ -110,6 +110,13 @@ class AppContext {
         try await self.vpnManager.enableVpn(options: options)
         self.networkContext = context
         self.vpnOptions = options
+        
+        // TODO
+        Task {
+            try await Task.sleep(for: .seconds(5))
+            let resp = try await self.vpnManager.sendMessage("hello vpn".data(using: .utf8)!)
+            NSLog("resp: \(String(data: resp, encoding: .utf8))")
+        }
     }
     
     // 断开网络连接