ble_app_uart peripheral example, SDK12.3, 51822, turning advertising on/off

[Robin]

Hello again Nordic Pro's,

As you probably all know by now, our product app is based on the subject example code, SDK and device.  We need to programmatically disconnect from a central, turn advertising off and then later, turn advertising back on for testing purpose.  I have found a ticket that references this using a newer device and SDK, using calls to sd_ble_gap_disconnect(), sd_ble_gap_adv_stop() and sd_ble_gap_adv_start().  However the start and stop calls are not made directly from main() within the 12.3 example, as shown in the other ticket.  What are the implications of performing these calls from within our app to disconnect from a central, stop,  and later restart advertising?  ie are there any connection vars that must be managed, or other such holes we might fall into or can I freely use these functions to do as required.

Thanks again,

Robin @ TL

[Hung Bui]

Hi Robin, 

Do you use the ble_advertising in your firmware ?

If you don't use the ble_advertising but rather use the softdevice API to initialize and start advertising, you can follow this message sequence chart: https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s130.api.v2.0.1/group___b_l_e___g_a_p___a_d_v___m_s_c.html?cp=5_7_2_2_2_1_3_0

 You are free to use this function, but you need to follow the requirement of the priority context that there has to be called from application low priority or in main() context. 

[Robin]

Hello Hung Bui,

Thank you for the prompt reply. So, I am not totally sure if the ble_advertising code is being used, but the c file with that name is within the project, and that file is the is the only place, other that a header that creates macros with them, that I can find calls to the ... start and ...stop functions. 

What is the point of your question.  How would the disconnect/stop_adv/restart_adv process change if it is being used?

Thank you again,

Robin @ TL

[Hung Bui]

Hi Robin, 

The question is to check if you use the ble_advertising module to do your initial advertising. If the module is being used, the advertising will restart automatically after disconnected. 
So what you need to do is to remove the call on_disconnected() inside ble_advertising_on_ble_evt() in ble_advertising.c

And then in your own code you can start advertising again by calling ble_advertising_start() with the mode you want. 

To disconnect you can call sd_ble_gap_disconnect() to request the connection to be terminated. There will be  BLE_GAP_EVT_DISCONNECTED event after the connection is disconnected. 

[Robin]

Hello Hung Bui,

Thank you very much.  This info should help simplify my efforts.  Your expert advice is greatly appreciated.

I will post my final code and results when I get back to resolving this issue

Robin @ TL