I am trying to get a websocket connection between an iOS Client (iPad Air 2) and my C# Server.
On iOS I'm using Starscream (https://github.com/daltoniam/Starscream) for websocket connections. But right after I successfully connect to my server, it automatically disconnects. The Sec-WebSocket-Accept are the same on both sides. I am guessing that the error is in my C# server, but i can't figure out what exactly is wrong.
Here my iOS code:
class ViewController: UIViewController {
var socket : WebSocket!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
socket = WebSocket(url: URL(string: "ws://192.168.188.35:80")!)
socket.connect()
socket.pongDelegate = self
socket.advancedDelegate = self
}
deinit {
socket.disconnect(forceTimeout: 0, closeCode: 0)
socket.delegate = nil
}
}
extension ViewController: WebSocketAdvancedDelegate {
func websocketDidConnect(socket: WebSocket) {
print("connect")
}
func websocketDidDisconnect(socket: WebSocket, error: Error?) {
print("disconnect")
}
func websocketDidReceiveMessage(socket: WebSocket, text: String, response: WebSocket.WSResponse) {
print("receivedMessage")
}
func websocketDidReceiveData(socket: WebSocket, data: Data, response: WebSocket.WSResponse) {
print("receivedData")
}
func websocketHttpUpgrade(socket: WebSocket, request: String) {
print("httpUpgradeRequest")
print(request)
}
func websocketHttpUpgrade(socket: WebSocket, response: String) {
print("httpUpgradeResponse")
print(response)
}
}
And here is my C# server:
public TcpListener server;
public MainWindow()
{
server = new TcpListener(IPAddress.Parse("192.168.188.35"), 80);
server.Start();
Console.WriteLine("Server has started on 127.0.0.1:80.{0}Waiting for a connection...", Environment.NewLine);
TcpClient client = server.AcceptTcpClient();
Console.WriteLine("A client connected.");
NetworkStream stream = client.GetStream();
while (client.Available < 3)
{
// wait for enough bytes to be available
}
Byte[] bytes = new Byte[client.Available];
stream.Read(bytes, 0, bytes.Length);
//translate bytes of request to string
String data = Encoding.UTF8.GetString(bytes);
if (Regex.IsMatch(data, "^GET"))
{
const string eol = "\r\n"; // HTTP/1.1 defines the sequence CR LF as the end-of-line marker
Byte[] response = Encoding.UTF8.GetBytes("HTTP/1.1 101 Switching Protocols" + eol
+ "Connection: Upgrade" + eol
+ "Upgrade: websocket" + eol
+ "Sec-WebSocket-Accept: " + Convert.ToBase64String(
System.Security.Cryptography.SHA1.Create().ComputeHash(
Encoding.UTF8.GetBytes(
new System.Text.RegularExpressions.Regex("Sec-WebSocket-Key: (.*)").Match(data).Groups[1].Value.Trim() + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
)
)
) + eol
+ eol);
stream.Write(response, 0, response.Length);
}
else
{
}
}
