--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CircuitPython/rtc.py	Thu Aug 29 19:05:05 2019 +0200
@@ -0,0 +1,15 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2019 Detlev Offenbach <detlev@die-offenbachs.de>
+#
+
+"""
+Module containing stubs for API generation of the 'rtc' module.
+"""
+
+def set_time_source(rtc):
+    pass
+
+class RTC():
+    datetime = tuple()
+    calibration = 0