Scanning Duration nRF SDK 15.2.0

[Abhishek]

Hi,

I am working with nRF PCA10056 evaluation board and using SDK 15.2.0. I am using nRF52840 as a central scanner, where it will scan broadcast data from beacons.

I want to have a specified scan duration in my application. I could not find the specified definition for my requirement in the infocenter documents.

So to avoid any confusion I am posting the picture of my requirement. In the Image I am looking to define the Scan Duration ( pardon for bad handwriting)

The SDK files have definition for .window, .interval but there is no setting for the scan duration.

I need to understand where can I configure this.

Thanks

[Hung Bui]

Hi, 

You scan until you stop scanning. There is no duration to configure. Simply call stop scanning to stop 

[Abhishek]

Hi Hung,

Thanks for your reply.

what is the definition of .timeout variable in  

"scan_params.timeout       = NRF_BLE_SCAN_SCAN_DURATION; "

Thanks

Abhishek

[Hung Bui]

I'm sorry, my mistake. If you set the scan_params.timeout   = 0 then there will be no duration and you continue scanning until you stop. But if you set the scan_params.timeout = X it will be stopped automatically after X0ms after you start scanning. 

[Abhishek]

Hi Hung,

I have queries further here, which is leading me to some confusion.

1) what is the difference between the scan.timeout and the nrf_ble_scan_stop(), finding for its definition I searched the SDK which lead to sd_ble_gap_scan_stop(); whose defintion I could not find anywhere in the SDK.

2) If I use scan.timeout to limit the duration scan, how would I determine in my code if the scan has timed out

Regards

Abhishek

[Hung Bui]

Hi Abhishek, 

When you use timeout and when it's timed out you will receive an event (BLE_GAP_EVT_TIMEOUT), please have a look here: https://www.nordicsemi.com/DocLib/Content/SoftDevice_API_Doc/S140/v6-0-0/group_ble_gap_scan_msc

At the bottom you can find the two variant, stopping scanning either by sd_ble_gap_scan_stop() or with the timeout event. 

You can find the documentation about sd_ble_gap_scan_stop() in ble_gap.h or here. 

[Abhishek]

Thanks, I think I am good here with the explanation