diff --git a/src/onebot11/action/file/GetOnlineClient.ts b/src/onebot11/action/file/GetOnlineClient.ts
new file mode 100644
index 00000000..b1ff2585
--- /dev/null
+++ b/src/onebot11/action/file/GetOnlineClient.ts
@@ -0,0 +1,9 @@
+import BaseAction from '../BaseAction';
+import { ActionName } from '../types';
+export class GetOnlineClient extends BaseAction<void, Array<any>> {
+  actionName = ActionName.GetRobotUinRange;
+
+  protected async _handle(payload: void) {
+
+  }
+}
diff --git a/src/onebot11/action/types.ts b/src/onebot11/action/types.ts
index 0b071a5e..16a03abe 100644
--- a/src/onebot11/action/types.ts
+++ b/src/onebot11/action/types.ts
@@ -78,5 +78,6 @@ export enum ActionName {
     GoCQHTTP_GetGroupMsgHistory = 'get_group_msg_history',
     GoCQHTTP_GetForwardMsg = 'get_forward_msg',
     GetFriendMsgHistory = 'get_friend_msg_history',
-    GetGroupSystemMsg = 'get_group_system_msg'
+    GetGroupSystemMsg = 'get_group_system_msg',
+    GetOnlineClient = "get_online_clients"
 }
diff --git a/src/onebot11/main.ts b/src/onebot11/main.ts
index 4337b956..40cabe57 100644
--- a/src/onebot11/main.ts
+++ b/src/onebot11/main.ts
@@ -75,11 +75,11 @@ export class NapCatOnebot11 {
     // Create MsgListener
     const msgListener = new MsgListener();
     msgListener.onRecvSysMsg = async (protobufData: number[]) => {
-      // function buf2hex(buffer: Buffer) {
-      //   return [...new Uint8Array(buffer)]
-      //     .map(x => x.toString(16).padStart(2, '0'))
-      //     .join('');
-      // }
+      function buf2hex(buffer: Buffer) {
+        return [...new Uint8Array(buffer)]
+          .map(x => x.toString(16).padStart(2, '0'))
+          .join('');
+      }
       // let Data: Data = {
       //   header: {
       //     GroupNumber: 0,
@@ -152,6 +152,7 @@ export class NapCatOnebot11 {
         // 528 68  GroupApply
         // 528 138 C2CRecall
         // 528 290 C2CPoke
+        // 528 349 DeviceChange
         // 732 12  GroupBan
         // 732 16  GroupUniqueTitleChange
         // 732 17  GroupRecall