async def METHOD_NAME():
    p = argparse.ArgumentParser(description=__doc__)
    p.add_argument("base_uri")
    args = p.parse_args()
    ctx = await aiocoap.Context.create_client_context()
    def assert_(truth, error=""):
        if not truth:
            print("Assertion failed:", error)
            sys.exit(1)
    await work_fileserver(ctx, args.base_uri, assert_)