connect to a server with tls ssl PEM cert file

[Ganime422]

Hello

How is it possible to connect using a cert file? I've tried to do like so:

var request = URLRequest(url: URL(string: "tls://host.com:1234")!)
request.timeoutInterval = 10
let pinner = FoundationSecurity(allowSelfSigned: true)
var socket = WebSocket(request: request, certPinner: pinner)
socket?.delegate = self
socket?.connect()

and I've also added a didRecieve func to recieve messages, but

1. I didn't recieve anything
2. I'm not using my certificate

is it possible to connect with a PEM cert file using this lib?