state
=====

.. py:module:: state

.. autoapi-nested-parse::

   Dashboard state kept in RTC memory, which survives deep sleep.

   {"readings": {...}, "online": bool, "fetched": start of the last fetch (s),
    "header": header dict (see `header`)}

   Kept in RTC memory rather than flash, since it is written on every wake
   and needs no copy across power loss. `rtc` is machine.RTC() on the board,
   a fake in tests.



Attributes
----------

.. autoapisummary::

   state.MAX_SIZE


Functions
---------

.. autoapisummary::

   state.save
   state.load


Module Contents
---------------

.. py:data:: MAX_SIZE
   :value: 2048


.. py:function:: save(rtc, state)

   Store `state` as JSON in RTC memory.

   :raises ValueError: If it does not fit into MAX_SIZE bytes.


.. py:function:: load(rtc)

   The saved state, or None after power loss or if it is unreadable.