Swift Socket Client/Server

Hello!

I would like to create a simple client server application in swift (for MacOS). The client have to send a string to server, and the server have, once received the string, send another string to client.

I have that examples, but I can compile it, but the string won't send or receive:

Server side:

func echoService(client: TCPClient) {
    TextBox1.stringValue = ("Newclient from:\(client.address)[\(client.port)]")
    let d = client.read(1024*10)
    client.send(data: d!)
    client.close()
}

func testServer() {
    let server = TCPServer(address: "127.0.0.1", port: 8080)
    switch server.listen() {
    case .success:
        while true {
            if let client = server.accept() {
                echoService(client: client)
            } else {
                TextBox2.stringValue = ("accept error")
            }
        }
    case .failure(let error):
        TextBox2.stringValue = ("error")
    }
}

client side:

 let client = TCPClient(address: "127.0.0.1", port: 8080)
    switch client.connect(timeout: 4) {
    case .success:
        switch client.send(string: "GET / HTTP/1.0\n\n" ) {
        case .success:
            guard let data = client.read(1024*10) else { return }
            
            if let response = String(bytes: data, encoding: .utf8) {
                print(response)
            }
        case .failure(let error):
            print(error)
        }
    case .failure(let error):
        print(error)
    }

For do that I'm using the library SwiftSocket, found here:

I know swift don't have (for now I hope) an internal library for the socket connection, but any ideas is welcome...