scanning sometimes stopped

RE: scanning sometimes stopped

run_ar — Wed, 27 Mar 2019 13:23:17 GMT

If the device is already in the whitelist you can use sd_ble_gap_connect and filterpolicy set to whitelist, no need to scan first. Then only use sd_ble_gap_scan_start in case you are looking for unknown devices.

Have you seen the message sequence chart for Whitelist Sharing?

RE: scanning sometimes stopped

run_ar — Wed, 27 Mar 2019 13:16:28 GMT

Did you already receive the connected event when you try to start scanning again? If not, I assume the whitelist would be in use by sd_ble_gap_connect.

RE: scanning sometimes stopped

Mikhail — Wed, 20 Mar 2019 11:39:36 GMT

I have second case- I need start scan for second connect when already has connected.

after success connected I call sacn_start() and get error

// 0x3203 BLE_ERROR_GAP_WHITELIST_IN_USE

how to start the scan, being in the connection?

RE: scanning sometimes stopped

Mikhail — Tue, 19 Mar 2019 15:00:06 GMT

Regarding second answer- when I call sd_ble_gap_connect, means that whitelist is already started? And at this case after each received advertise packet, I restart scan by call sd_ble_gap_connect(). Correct?

on_adv_report(&p_gap_evt->params.adv_report);

But after connected, I need reinit whitelist by call scan_start();

My question is - between received advertise packet, thw whitelist stored and enough just call sd_ble_gap_connect? But after connect I have to call whitelist init by call scan_start();

RE: scanning sometimes stopped

run_ar — Tue, 19 Mar 2019 14:35:12 GMT

1. NRF_ERROR_INVALID_STATE

2. Not sure I understand the question. When calling sd_ble_gap_connect, you do so to connect to a known device. i.e. you either have to provide a whitelist or the address you which to connect to. While sd_ble_gap_scan_start is used to look for advertiser, can also use the whitelist.

RE: scanning sometimes stopped

Mikhail — Tue, 19 Mar 2019 12:16:26 GMT

1. What error will be returned if the scan is already running?

2. Why after receive each advertice packet I need run sd_ble_gap_scan_start but after connected I should run scan_start with full white list initialize again.

RE: scanning sometimes stopped

run_ar — Tue, 19 Mar 2019 09:56:35 GMT

When calling sd_ble_gap_scan_start you can check the error message to see if scanning is started, if successfull it is ok. Please note that scanning needs to be restarted when you receive an adverisement report (This is normally handled by the scanning module).