def drop(self):
self._process.drop()<EOL>
Preset call to drop coffee from the roaster via thread signal.

        This will set the following configuration on the roaster:
        - drum_motor = 0
        - heater = 0
        - solenoid = 1
        - cooling_motor = 1
        - main_fan = 10

        In order to power-off the roaster after dropping coffee, it's best to
        use the shutdown method. It's assumed that cooling will occur for 5-10
        minutes before shutting down.

        :returns: None