send mouse drag over wrtc (#139)

* send mouse drag over wrtc

* add more debugging code

* wrtc data channel working

src/App.tsx

@@ -138,6 +138,12 @@ export function App() {
     })
   }
   const engineCommandManager = useMemo(() => new EngineCommandManager(setMediaStream), [])
+  useEffect(() => {
+    return () => {
+      engineCommandManager.tearDown()
+    }
+  }, [])
+
   useEffect(() => {
     const asyncWrap = async () => {
       try {