How do I implement bi-directional communication between ESP32 and Node.js using WebSockets?

Bi-directional communication is achieved by both the ESP32 and Node.js server sending and receiving data over the WebSocket connection. The ESP32 can send data to the server, which can then send data back to the ESP32. This allows for both control and monitoring functionalities, enabling real-time feedback and interaction between the device and the web application.