pylabrobot.liquid_handling.backends.chatterbox.LiquidHandlerChatterboxBackend.request_tip_presence# async LiquidHandlerChatterboxBackend.request_tip_presence() → List[bool | None]# Return tip presence based on the tip tracker state. Returns: A list of length num_channels where each element is True if a tip is mounted, False if not, or None if unknown. Return type: List[bool | None]