[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]

what's difference between General Discoverable and Limited Discoverable? and if no advertising, but we have bond before, can phone side do direct connect to nrf51822?

[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?