BLE-UART Non connectable Advertising

[Justin]

Hi,

I am using BLE-UART example in my project and to start advertising I am using below piece of code.

sd_ble_gap_adv_stop(m_advertising.adv_handle);
advertising_init();
ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);

By default in the sdk (ble_advertising.c) the advertising type is set to Connectable.

p_advertising->adv_params.properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED

However, I want to advertise as non connectable at certain point in my project. 

Setting p_advertising->adv_params.properties.type = BLE_GAP_ADV_TYPE_NONCONNECTABLE_SCANNABLE_UNDIRECTED is not reflecting the advertisement as the type is getting over ridden in sdk function ble_advertising_start() -> set_adv_mode_fast()

My intention is not to change the sdk functions. Can you please guide me how can I make advertisement NONCONNECTABLE in my case?

Thanks,

Justin

[Kenneth]

If you want to modify the advertisement packets you may just call:

sd_ble_gap_adv_stop()
sd_ble_gap_adv_set_configure()
sd_ble_gap_adv_start()

Though if you want to use the advertisement module you may find this answer useful:
https://devzone.nordicsemi.com/f/nordic-q-a/32824/dynamically-updating-advertising-data-in-sdk-15/128970#128970

[Justin]

Hi Kenneth,

I see that ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST); function does lot of other things for e.g. to check if flash access is in progress, whitelist fetch etc.

Is uisng sd_ble_gap_adv_start() same as ble_advertising_start?

I am confused between sd_ble_gap_adv_set_configure() and advertising_init().

When to use what? 

Can you please provide me more details on the same?

[Kenneth]

The api that start with 'sd_*' are the function calls to the BLE softdevice stack, while the 'ble_advertising_*' and 'advertising_init()' are just wrappers around these calls. The wrappers are typically SDK modules or libraries that make it slightly easier to setup and transition between advertising.

Best regards,
Kenneth

[Justin]

Thanks Kenneth.

Is it safe to use 'sd_*' function directly than to use 'ble_advertising_*' and 'advertising_init()' ?

[Kenneth]

It's no problem to use the 'sd_*' function directly no. There should be some examples that use 'sd_*' in the nRF5 SDK:

ble_app_beacon
ble_app_blinky
ble_app_multiperipheral
..

Best regards,
Kenneth