RE: BLE peripheral with 5 simultaneous advertising sets?

Draco — Fri, 27 Aug 2021 07:43:46 GMT

Hi Kenneth,

Thanks for that info. I managed to get my app to send all the advertisements after experimenting with many different methods. Here's my findings:

I set the advertisement interval to 100ms, and update the advertisement data every 100ms in the middle of the interval, i.e.: Start advertisement ---> update advertisement 150ms later ---> update advertisement 100ms later ---> ... What I observed is the first advertisement is often not sent out. Is there an event for when an advertisement is sent out?
I set the advertisement interval to 100ms, and used `ble_radio_notification_init` to get the radio event. In the radio event handler, I update the advertisement data when radio state is off. This is working reliably, except when I run scanning and advertising concurrently. I can't work out whether the radio event was for scan or transmit.
I set both advertisement interval and advertisement duration to 100ms. I look for `BLE_GAP_EVT_ADV_SET_TERMINATED` event to update advertisement data and start another round of 100ms advertisement. With this option, I get huge data loss, probably because the advertisements were not sent out.
When I run my scanner (interval 500ms, window 490ms, duration 0) concurrently with the advertisement, I only see the very occasional advertisement get sent out. If I change both the scan interval and window to 20ms, I get more advertisement packets. How do I reliably scan and advertise 5 data sets concurrently?

Good chance that I'm not reading the documentation correctly, but the behavior I've observed does not make sense to me.