How to change the default timeout(10 seconds) of ACI_GAP_START_GENERAL_DISCOVERY_PROC event?

[Shubham Trivedi]

I have successfully configuration P-NULCEO-WB55 as central(beacon observer) device using \STM32Cube_FW_WB_V1.4.0\Projects\P-NUCLEO-WB55.Nucleo\Applications\BLE\BLE_p2pClient example. ACI_GAP_START_GENERAL_DISCOVERY_PROC event ends after 10 seconds. Is there any way to reduce this 10 seconds time?

[Remi QUINTIN]

​The aci_gap_start_general_discovery_proc function has 2 parameters: SCAN_P, SCAN_L which are both set to 500 ms (0x320 = 800) : 800 x 0.625ms (app_conf .h)

For more info you can look at AN5270 that lists all the BLE ACI functions.

From this AN5270:

The procedure is terminated when either the upper layers issue a command to terminate the procedure by issuing the command ACI_GAP_TERMINATE_GAP_PROC with the procedure code set to 0x02 or a timeout happens. When the procedure is terminated due to any of the above reasons, ACI_GAP_PROC_COMPLETE_EVENT event is

returned with the procedure code set to 0x02

The timeout described here is 10s and is not configurable.

[Shubham Trivedi]

Thank you for this information. May i know this non configuration of timeout problem from BLUETOOTH SIG end or from ST end?

[Aishwarya]

Hello Shubham,

I have the same issue , device stop scanning after 10 second, how to restart BLE scanning process after 10 seconds are more.

[Shubham Trivedi]

Hi Aish,

You have to handle the general discovery process complete(GAP_GENERAL_DISCOVERY_PROC) event which belongs to EVT_BLUE_GAP_PROCEDURE_COMPLETE event code in SVCCTL_App_Notification function. upon receiving this event you should again start the discovery process.

[Aishwarya]

Thanks Shubham,

I tried,but function (GAP_GENERAL_DISCOVERY_PROC) returns status ERR_NOT_ALLOW, also try aci_gap_terminate_pro(0x02) to terminate general discovery process but function(aci_gap_terminate_pro(0x02)) returns same status ERR_NOT_ALLOW.

[Winfred LU]

ACI_GAP_TERMINATE_GAP_PROC shall work.

Attached the screenshot terminating the scanning after 1 second.

[Aishwarya]

yes @Winfred LU

Open Winfred LU Preview

 I fallow the same steps but aci_gap_terminate_pro(0x02)  function returns status ERR_NOT_ALLOW.

[Shubham Trivedi]

@Aishwarya​ Just curious to know that are you facing this problem while using STM32CubeMonRF software or while writing the code in STM32CubeIDE and executing on hardware? I have solutions for both.

[Winfred LU]

Please refer to AN5270 - STM32WB Bluetooth® Low Energy (BLE) wireless interface

https://www.st.com/resource/en/application_note/dm00571230-stm32wb-bluetooth-low-energy-ble-wireless-interface-stmicroelectronics.pdf

section 2.4.23 ACI_GAP_START_GENERAL_DISCOVERY_PROC

The procedure is terminated when either the upper layers issue a command to terminate the procedure by issuing the command ACI_GAP_TERMINATE_GAP_PROC with the procedure code set to 0x02 or a timeout happens (the timeout value is fixed at 10.24 s).

Please note that there is different ACI called ACI_GAP_TERMINATE, which is used to terminate the connection. Don't get confused with ACI_GAP_TERMINATE_GAP_PROC .