How to change the advertise status from fast mode to idle mode

[Shuto Kimura]

Hi,

I am creating a BLE communication device (peripheral) using softdevice S132 (v7.0.1) and SDK 16.0.0 on the nRF52832 microcomputer.

I have implemented the BLE communication function, but sometimes I do not understand it. It is the file and timing to change the advertising from fast mode to idle mode.

The application uses ble_advertising_start () to start advertising and enable fast mode. After that, advertising will stop once the connection is established. However, sd_ble_gap_adv_stop is not executed on the application side. Where and who is stopping advertising (idle mode)?

I referred to the following sequence.
https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.api.v7.0.1/group___b_l_e___g_a_p___a_d_v___m_s_c___l_e_g_a_c_y.html

thank you.

shuto

[Hung Bui]

Hi Shuto Kimura, 

I am sorry that our documentation didn't make it clear that when the peripheral get connected it will automatically stopped advertising. This is described in the Bluetooth Spec (v5.2) at section 9.2 Part C Vol 3: 

So the advertising process is stopped automatically when the connection is established. If you want to continue advertising you would need to start advertising again. You can have a look at the experimental\ble_app_multiperipheral example. 

The same with when the connection is terminated, the softdevice won't start advertising automatically. You would need to start advertising from the code. In our ble_advertising.c it's handled in on_disconnected() event. 

[Shuto Kimura]

Hi, Hung Bui,

thank you for your answer.
That is the answer I am looking for.
Is it the softdevice, not the SDK, that automatically stops advertising?
Also, could you please tell me the URL of Bluetooth Spec (v5.2) at section 9.2 Part C Vol 3?

thank you

shuto

[Hung Bui]

Hei Shuto, 
You can download the Bluetooth specification v5.2 here. (Click on 5.2 link)
It's the softdevice that stops the advertising. It follows the spec.