Advertising connectable: false stops advertising (nrf52832 dev board).

Hi @Gordon,
I'm using the espruino_2v01.10_nrf52832.hex load of firmware on a Nordic Dev board. I'm trying to turn off connectability, but keep advertising (this is a beacon application). Looking at https://www.espruino.com/BLE+Security and am using

NRF.setAdvertising({}, { connectable:false });

in my code. The device then stops advertising completely (I'm sniffing with nRFConnect to verify).

Is there something I'm missing?

Thanks,
Bill