EchoServer by SwfitDSSocket

ViewController.swift

import Cocoa
import SwiftDSSocket

class ViewController: NSViewController {
  var client: SwiftDSSocket?
  var server: SwiftDSSocket?
  let ServerTag = 0
  
  override func viewDidLoad() {
    super.viewDidLoad()
    server = SwiftDSSocket(delegate: self, delegateQueue: .main, type: .tcp)
    try? server?.accept(onPort: 9999)
  }
}


extension ViewController: SwiftDSSocketDelegate {
  func socket(sock: SwiftDSSocket, didAcceptNewSocket newSocket: SwiftDSSocket) {
    newSocket.readData(tag: ServerTag)
  }
  
  func socket(sock: SwiftDSSocket, didRead data: Data, tag: Int) {
    sock.write(data: data, tag: ServerTag)
    sock.readData(tag: ServerTag)
  }
}