API/Socket-API.md

@@ -248,6 +248,27 @@
 </details>
 
 
+---
+
+### GM Left
+| Socket | Description | User | Emitters |
+|--------|-------------|------|----------|
+| `gmLeft` | Listener will trigger when the gamemaster leaves the room | All | [`Exit Challenge REST`](https://gitlab.labranet.jamk.fi/wimma-lab-2022/iotitude/source-backend/-/wikis/API/REST-API#exit-challenge) |
+
+<details>
+<summary><b>Response</b></summary>
+
+```json
+{
+  "statusCode": 200,
+  "message": "Gamemaster left challenge",
+  "isActive": "boolean",
+}
+```
+
+</details>
+
+
 ---
 
 <br>