Requiem.ConnectionSupervisor.create_connection

You're seeing just the function create_connection, go back to Requiem.ConnectionSupervisor module for more information.
Link to this function

create_connection(handler, address, scid, dcid, odcid, allow_address_routing, config_ptr, sender_pid)

Specs

create_connection(
  module(),
  Requiem.Address.t(),
  binary(),
  binary(),
  binary(),
  boolean(),
  integer(),
  pid()
) :: :ok | {:error, :system_error}