Test.txt

func sendChat() {
    
    // convert the string message into Data
    guard let msg = self.messageField.text?.data(using: .utf8) else {
        print("Error: ", #line)
        return
    }

    // send the converted message
    try? self.session.send(msg, toPeers: self.session.connectedPeers, with: .unreliable)

    // update our own chat with the message we just sent
    self.updateChat(name: "Local", text: self.messageField.text!)
    
    // clear out the message field since the message has been sent
    self.messageField.text = ""
}