'Return true if switch is available.'

@property
def available(self):

    if ((self._model_name == 'Insight') and (self.insight_params is None)):
        return False
    if ((self._model_name == 'Maker') and (self.maker_params is None)):
        return False
    if ((self._model_name == 'CoffeeMaker') and (self.coffeemaker_mode is None)):
        return False
    return True
