Removes a will that was previously configured with will_set().

        Must be called before connect() to have any effect.

def will_clear(self):
        """ Removes a will that was previously configured with will_set().

        Must be called before connect() to have any effect."""
        self._will = False
        self._will_topic = ""
        self._will_payload = None
        self._will_qos = 0
        self._will_retain = False