Scanning Duration nRF SDK 15.2.0

RE: Scanning Duration nRF SDK 15.2.0

Somesh Burkule — Tue, 26 May 2020 10:28:27 GMT

Hi cann0021,

you cannot set timeout value in scan init.

you will need to set scan parameter's using ble_gap_scan_params_t struct.

for example:

static ble_gap_scan_params_t m_scan_param;

m_scan_param.timeout = timeout,

BR,

Somesh Burkule

RE: Scanning Duration nRF SDK 15.2.0

cann0021 — Thu, 21 May 2020 08:58:30 GMT

Hello everyone.

(borad:nRF52832 sdk:16.0.0)

How to update timeout value at runtime ?

In scan_init() function, I tried to add

init_scan.p_scan_param->timeout = my_value;

When I compile the code, compiler turns with an error: "assignment of member ‘timeout’ in read-only object".

Thanks.

RE: Scanning Duration nRF SDK 15.2.0

Somesh Burkule — Tue, 28 Apr 2020 13:49:33 GMT

Ohh. got it.

Thanks.

RE: Scanning Duration nRF SDK 15.2.0

Hung Bui — Thu, 16 Apr 2020 11:58:13 GMT

X0ms meaning if you set scan_params.timeout = 2, the scanning timeout is 20ms. You don't need to call scan_stop() before you can start again.

RE: Scanning Duration nRF SDK 15.2.0

Somesh Burkule — Thu, 16 Apr 2020 10:41:59 GMT

X0ms? what does it mean?

my scan duration is 500ms. and I'll get timeout event after 500ms. right?

And after that I again start scanning. does it need sd_ble_gap_scan_stop(); after timeout?

RE: Scanning Duration nRF SDK 15.2.0

Abhishek — Fri, 01 Feb 2019 18:53:20 GMT

Thanks, I think I am good here with the explanation

RE: Scanning Duration nRF SDK 15.2.0

Hung Bui — Mon, 21 Jan 2019 12:15:23 GMT

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.

RE: Scanning Duration nRF SDK 15.2.0

Abhishek — Fri, 18 Jan 2019 17:07:01 GMT

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

RE: Scanning Duration nRF SDK 15.2.0

Hung Bui — Wed, 02 Jan 2019 13:09:51 GMT

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.

RE: Scanning Duration nRF SDK 15.2.0

Abhishek — Fri, 28 Dec 2018 14:47:40 GMT

Hi Hung,

Thanks for your reply.

what is the definition of .timeout variable in

"scan_params.timeout = NRF_BLE_SCAN_SCAN_DURATION; "

Thanks

Abhishek

RE: Scanning Duration nRF SDK 15.2.0

Hung Bui — Fri, 28 Dec 2018 07:20:29 GMT

Hi,

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