Using ble_advertising_start() to transition from slow to fast advertising fails with NRF_ERROR_INVALID_STATE

[eric-appion]

Under some conditions I want to force advertising to transition from slow to fast. With SDK 14, I could just call ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST), but with SDK 15, that returns NRF_ERROR_INVALID_STATE.

I see that there are some other support cases from people trying to change the advertising data, getting an invalid state error apparently because they have to change to a new buffer or something. I'm not trying to change any of the advertising data, just change from slow back to fast advertising. Is there something I can do to avoid the dreaded invalid state error?

[run_ar]

Hi,

In sdk 15.2. there is a function called ble_advertising_advdata_update that you could use to update the advdata. This function is just calling sd_ble_gap_adv_set_configure to update the advertisement set.

[eric-appion]

Thanks for the suggestion! I have just migrated to SDK 15.2.0, and that new API call may be useful to me in the future. However, at the moment I'm not trying to update the advertising data. I want to continue advertising with the same data, but to transition from _MODE_SLOW to _MODE_FAST.

[run_ar]

As far as I can see in our SDK we usually change mode when the previous mode has timed out. If you want to change mode while advertising is ongoing you could consider stopping it first. An example would be the "ble_advertising_restart_without_whitelist" function in ble_advertising.c

[eric-appion]

OK, I'll give that a try. Thanks!