[NRF51822] How to set device to Non-discovery Mode?

[Terry]

I have 3 questions: 1. How to set device to non-discovery mode? 2. Once the device is in non-discovery mode, How can host connect to it? 3. Can I use Master Control Panel to connect device which is in non-discovery mode?

[julian]

Thanks for the reply, What I observe is after bonding, Master can connect without scan, but slave have to advertising, if no advertising, master can't connect as well, seems contradict with http://stackoverflow.com/questions/22097079/is-it-possibile-to-wake-up-a-deep-sleep-ble-device-in-android-sdk since we want to save slave's power, I wonder, is it possible the other way, which is slave doesn't need to advertising?

[SH]

A general question? What is the use-case where a BLE device will send an advertisement packet when in non-discoverable mode? I.e what is the point in doing this since technically there is no discovery procedure to look for advertisements in which limited discoverable mode is not set and general discoverable mode is not set.