How to config BLE to minimize time of building connection

RE: How to config BLE to minimize time of building connection

Mttrinh — Tue, 05 Oct 2021 07:54:01 GMT

Hi,

[quote user="Eric_H"]Because master can catch the advertising a least once time in its scan window, the time cost of connection will less then 120 ms(for 3 channel*40 ms) is it correct?Or I misunderstand how scan and advertisement work ?[/quote]

Yes, that is correct.

[quote user="Eric_H"]

And, is it any others configuration can help it connect faster(maybe whitelist...)?

[/quote]

You can try adding pairing/bonding to the example, that should help with the connection speed. You will need to add the peer manager to the example in order to support pairing/bonding. You should take a look at another example on how it is done, for example ble_app_hrs.

RE: How to config BLE to minimize time of building connection

Eric_H — Fri, 01 Oct 2021 14:28:46 GMT

Hi Mttrinh,

thanks for your reply

I didn't modify any default setting except advertising interval, scan interval and scan window(maintain the original configuration from nrf_ble_uart example),and I test it in a quiet room with seldom wireless devices.

I want to know that is it possible to make it connect fast every time(as sometimes it can do),for example if I set:

advertising interval: 20ms

scan interval: 40ms

scan window: 40ms

Because master can catch the advertising a least once time in its scan window, the time cost of connection will less then 120 ms(for 3 channel*40 ms) is it correct?Or I misunderstand how scan and advertisement work ?

And, is it any others configuration can help it connect faster(maybe whitelist...)?

Thanks you very much!

RE: How to config BLE to minimize time of building connection

Mttrinh — Mon, 27 Sep 2021 15:43:18 GMT

Hi,

[quote user=""]

want to build BLE connection between nrf52833 and nrf52810 as soon as possible (maybe in 100-200ms)

can I achieve that by config Advertising Interval,Scan Interval and Scan window or others configuration?

[/quote]

You can adjust the mentioned parameters for it to connect faster.

[quote user=""]Sometimes they build connection immediately but sometimes they spend 2-3 second,which longer a lot then I expect[/quote]

2-3 second does seem a bit long. Have you made any modifications other than the advertising interval, scan interval and scan window? Are you around a lot of wireless devices when testing?