Process to change BLE scan filter

[anusha_14]

Hello Nordic team,

In my BLE application, I would like to initially scan for a certain peripheral using advertised UUIDs (i.e. using UUID filter). Then, when the application finds this device, I would like to change the scan filter to scan based on MAC address (i.e using ADDR filter). For this use case, do I need to call nrf_ble_scan_init() again and then set the new filter or is it enough to stop the scan and set the new filter? 

Do I need to disable Softdevice before performing these operations?

Thanks,

Anusha

[Joakim Jakobsen]

Hi!

You need to call nrf_ble_scan_init() before setting the scan filters.

However, you don't need to call the init function again to set a new filter. You don't need to disable the softdevice either.

Are you seeing any errors adding the new filter?

Br,
Joakim

[anusha_14]

Hi Joakim,

Thanks for your response. I haven't tried it yet but wanted to check the right process to do this. I would like to clarify one more point, which I missed to ask earlier.

When I first perform scan initialise with UUID filter, I need to set connect_if_match to true. Later when I perform filtering with MAC address, I need connect_if_match to false. In this case, I need to reinitialise scan by calling nrf_ble_scan_init(), right?

Is there any issue in initialising scan module twice? 

Thanks, 

Anusha

[Joakim Jakobsen]

I don't think there should be any issue. But let me know if you run into any trouble, and I'll do my best to help you solve it.

Br,
Joakim

[anusha_14]

Thanks for your response. I will try this and let you know in case I face issues.