Have you worked with WebSocket protocol for implementing bidirectional communication in applications?

Yes, experience with the WebSocket protocol is useful for implementing two-way communication in applications, especially in iOS. WebSocket allows establishing a persistent connection between the client and server, enabling real-time data exchange without the need for constant requests.

In iOS, you can use URLSessionWebSocketTask to work with WebSocket, which appeared in iOS 13. Here's an example of a simple connection and message sending:

let url = URL(string: "wss://example.com/socket")!
let webSocketTask = URLSession.shared.webSocketTask(with: url)
webSocketTask.resume()

let message = URLSessionWebSocketTask.Message.string("Hello server!")
webSocketTask.send(message) { error in
    if let error = error {
        print("Error sending: \(error)")
    }
}

This approach allows implementing chat, real-time updates, and other interactive features.