documentation for bt_le_filter_accept_list_add unclear

[frankbuss]

The documentation at https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/connectivity/bluetooth/api/gap.html#c.bt_le_filter_accept_list_add is unclear. When can I call this function? Do I need to stop scanning and advertising before calling it? An example would be good.

What I want to achieve: I'm running the nRF5340 in central mode, and I pair and bond multiple other BLE devices. I would like to auto connect to these devices, if possible.

I also looked at bt_le_set_auto_conn, but can't use this, since I'm also using our own scan filter callback function, which filters for other criteria as well, for connecting to non-bonded devices.

My current solution is to check the settings in this scan filter callback, if the device is bonded, and then connect. Was just wondering if this is somehow possible automatically.

[Vidar Berg]

Hello,

The whitelist can't be updated while a scanner or advertiser is using it. So, either you must stop the advertiser/scanner before you update the list, or you must wait with starting the scanner/advertiser until after the bonding is complete and the list is updated.

My current solution is to check the settings in this scan filter callback, if the device is bonded, and then connect. Was just wondering if this is somehow possible automatically.

I'm not sure I understand what difference it would make if the BT host auto initiated the connection instead of your app? It sounds like your device will re-connect automatically either way.

[warcomeb-am]

I am using my device (nRF5340) only for beacon scanning... and I am trying to add the accept list before the scan starts, but it doesn't work... I see all the devices around me!

My configuration is: 

CONFIG_BT=y
CONFIG_BT_OBSERVER=y
CONFIG_BT_FILTER_ACCEPT_LIST=y

[Vidar Berg]

Please make sure you are enabling the BT_LE_SCAN_OPT_FILTER_ACCEPT_LIST option bit when you start the scanner. Otherwise, it will not use the whitelist.

[warcomeb-am]

It works! Thanks!