MLLP.TLSContract.connect

You're seeing just the callback connect, go back to MLLP.TLSContract module for more information.
Link to this callback

connect( address, port, options, timeout )

Specs

connect(
  address :: :inet.socket_address() | :inet.hostname(),
  port :: :inet.port_number(),
  options :: [:ssl.tls_client_option()],
  timeout :: timeout()
) :: {:ok, :ssl.sslsocket()} | {:error, any()}