NSURLSessionStreamTask

gistfile1.swift

// Asynchronous read

let task = NSURLSession.sharedSession().streamTaskWithHostName("chat.example.com", port: 5555)!
task.resume()

task.readDataOfMinLength(16384, maxLength:65536, timeout: 30.0) {
    (data: NSData?, eof: Bool, error: NSError?) in
    //
}


// Asynchronous write

let task = NSURLSession.sharedSession().streamTaskWithHostName("chat.example.com", port: 5555)!
task.resume()

let data: NSData = //...
task.writeData(data, timeout: 30.0) { 
    (error: NSError?) in
    //
}

// Enabling TLS

let task = NSURLSession.sharedSession().streamTaskWithHostName("chat.example.com", port: 5555)!
task.startSecureConnection()
task.resume()

let data: NSData = // ...
task.writeData(data, timeout: 30.0) { 
    (error: NSError?) in
    // ... 
}