Make ble device connectable but not discoverable

[helpme]

I am using ble_app_uart SDK_11 s130 on nRF51-dk. I would like to make the device running on ble_app_uart connectable but not discoverable. The Android app will have pre-knowledge of the device name. So, the Android app should be able to connect to ble_app_uart without scanning. Is it possible to make a BLE device connectable but not discoverable?

[Øyvind Karlsen]

Hi,

This is not possible, in BLE the device has to go into advertising mode to be connectable. Please see this answer.

You can implement something similar though by adding the device running the app to a whitelist.

Best regards,

Øyvind

[helpme]

Thanks for the answer. Upvoted.

Is a whitelist a list of mac addresses of the phones that are allowed to connect to ble_app_uart? If yes, then it cannot work in my context because I do not know beforehand what phones will connect to ble_app_uart.

[Øyvind Karlsen]

Well, you need some way to initially connect as well. For example you can pair them using shared out of band keys.

[helpme]

out of band keys require the use of NFC. I am not using NFC. By the way, is my understanding of a whitelist correct?

[Øyvind Karlsen]

A whitelist is just a list of devices that are allowed to connect to the device. For example you can preshare a key, or any other means.