Strange behaviour when setting BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE

[Youssif]

Hi

We are seeing a strange behaviour when using sd_ble_gap_adv_set_configure(). When we set the advertising data in the ble_gap_adv_data_t to have the advertising flag set to BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE, everything works fine. However, as soon as we set the flag to BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE (while keeping  everything else exactly the same including the advertising data and the advertising parameters), the function fails with NRF_ERROR_INVALID_PARAM. Is there any reason for this behaviour?

We are using SDK15.0.0 and softdevice 6.0.0 on an nRF52840 PDK.

Thanks

Youssif

[Håkon Alseth]

Hi

 

_LIMITED_DISC_MODE indicates to a central that you are only available for a certain amount of time before the advertisement times out.

Setting _GENERAL_DISC_MODE when initializing your advertiser will enable you to set a timeout of 0 (ie: no timeout).

 

If you set the advertising timeout to non-zero && <= 180, the _LIMITED_DISC_MODE shall return NRF_SUCCESS.

 

Best regards,

Håkon 

[Youssif]

This makes sense and it has fixed the problem. Thank you for your quick response.