Scan and Advertise

RE: Scan and Advertise

kmassa5 — Sun, 02 Aug 2020 16:51:41 GMT

Sure! So I built it on top of the ble_att_mtu_throughput example which is built to scan and advertise (has scan_start and advertise_start functions). Basically you can set the advertising/scanning intervals (time between advertisements and scans) and scan window (how long out of the interval you’re scanning). There’s backend nordic code that schedules each event for you based on the info you set in sdk_config.

RE: Scan and Advertise

scic0 — Sun, 02 Aug 2020 16:04:14 GMT

Hi kmassa5, I am working on similar project where I need to detect the proximity between two nRF52 modules by both of them. I wanted to ask how did you enable simultaneous scanning and advertising?

Did you just call `nrf_ble_scan_start()` and `ble_advertising_start()` back to back and then the SoftDevice handled the rest?.

Also, can you explain briefly (or point me to some resource) as how does simultaneous scanning and advertising work physically, I mean how are both of them time-slotted?

Thanks.

RE: Scan and Advertise

kmassa5 — Mon, 27 Jul 2020 15:07:24 GMT

Update: To anyone looking at this for help, I fixed the problem by handling the analysis of advertising reports not in ble_evt_handler but in scan_evt_handler. Scan events contain advertising reports too! :)

RE: Scan and Advertise

kmassa5 — Fri, 24 Jul 2020 16:59:06 GMT

Thanks Simon, I'll take a look!

EDIT: Something I recently discovered is that the two boards do seem to pick up each other's advertisements in their scan event handlers, and are able to connect to one another. However, neither is picking up advertising reports from the other. Do you think this could have something to do with their scan responses?

RE: Scan and Advertise

Simon — Thu, 23 Jul 2020 18:40:40 GMT

Try the suggestions given by Kenneth in this ticket: https://devzone.nordicsemi.com/f/nordic-q-a/33826/how-to-improve-the-success-rate-of-scanning-ibeacon-stations

Best regards,

Simon