#!/usr/bin/env python3
+# © Copyright 2021-2022, Scott Gasch
+
"""Several helpers to keep track of internal state via periodic
polling. StateTracker expects to be invoked periodically to maintain
state whereas the others automatically update themselves and,
-optionally, expose an event for client code to wait on state changes."""
+optionally, expose an event for client code to wait on state changes.
+
+"""
import datetime
import logging