NestJS WebSocket

Question

I use angular in the front end where I am learning to use rxjs-websockets. In backend I use nestjs, where i want to learn to use websockets. But every tutorial i see, they are explaning socket.io which i cannot use with rxjs-websocket. Using the nestjs documentation i have managed to implment till establishing connection with the angular-client(that uses rxjs-websocket) but thereafter have'nt made any progress since the documentation too talks more about socket.io than websocket. Kindly guide me to some useful resources.