Use /core/ instead of /api/ when connecting to supervisor directly

README.md

@@ -106,6 +106,9 @@ Please check it https://www.smarthomejetzt.de/mit-iobroker-auf-eine-home-assista
 -->
 
 ## Changelog
+### **WORK IN PROGRESS**
+* (@klein0r) Use /core/ instead of /api/ when connecting to supervisor directly (e.g. in ha app)
+
 ### 2.0.3 (2026-04-02)
 * (@GermanBluefox) Adapter was updated and migrated to TypeScript
 * (@Titanium177) Added roles for states and added debouncing for reading states from hass

src/lib/hass.ts

@@ -228,7 +228,7 @@ export default class HASS extends EventEmitter {
         }
 
         this.socket = new WebSocket(
-            `ws${this.options.secure ? 's' : ''}://${this.options.host}:${this.options.port}/api/websocket`,
+            `ws${this.options.secure ? 's' : ''}://${this.options.host}:${this.options.port}/${this.options.host === 'supervisor' ? 'core' : 'api'}/websocket`,
             { perMessageDeflate: false },
         );