def METHOD_NAME(self, key, value, timestamp):
    """Advance the device test suite to a proper test case.
    Additionally, send test case data to the device.
    """
    self.handshake_timer_cancel()
    msg_value = '{0.index:02x},{0.data_to_send:08x}'.format(self.current_case)
    self.send_kv(MSG_KEY_START_CASE, msg_value)
    self.drop_heartbeat_messages = False
    self.hb_timestamps_us = []