Query device for all attributes that exist regardless of power state.

        This will force a refresh for all device queries that are valid to
        request at any time.  It's the only safe suite of queries that we can
        make if we do not know the current state (on or off+standby).

        This does not return any data, it just issues the queries.

def refresh_core(self):
        """Query device for all attributes that exist regardless of power state.

        This will force a refresh for all device queries that are valid to
        request at any time.  It's the only safe suite of queries that we can
        make if we do not know the current state (on or off+standby).

        This does not return any data, it just issues the queries.
        """
        self.log.info('Sending out mass query for all attributes')
        for key in ATTR_CORE:
            self.query(key)