def create(host, port):
    """
    Prepare server to execute

    :return: Modules to execute, cmd line function
    :rtype: list[WrapperServer], callable | None
    """
    wrapper = WrapperEchoServer({
        'server': None
    })
    d = {
        'listen_port': port,
        'changer': wrapper
    }
    if host:
        d['listen_bind_ip'] = host

    ses = EchoServer(d)
    wrapper.server = ses
    return [wrapper], cmd_line