check_connection_used_by_others
err = check_connection_used_by_others(bebob, &bebob->rx_stream);
err = check_connection_used_by_others(efw, &efw->rx_stream);
err = check_connection_used_by_others(oxfw, &oxfw->rx_stream);
err = check_connection_used_by_others(oxfw, &oxfw->tx_stream);