Different capabilities on BLE peripheral device with multi-link, multi-peripheral and multi-role features

RE: Different capabilities on BLE peripheral device with multi-link, multi-peripheral and multi-role features

Min-Ching Ho — Thu, 04 Jun 2020 18:42:12 GMT

Hi,

I have a follow up question regarding to making nRF52840 a peripheral work with multiple centrals. Can some central use secure connection and some don't? How should I configure that?

Thank you,

Min-Ching Ho

RE: Different capabilities on BLE peripheral device with multi-link, multi-peripheral and multi-role features

beemavishnu — Thu, 07 May 2020 18:41:49 GMT

Thank you for your inputs.

RE: Different capabilities on BLE peripheral device with multi-link, multi-peripheral and multi-role features

Sigurd — Thu, 07 May 2020 18:39:48 GMT

Hi,

[quote user="beemavishnu"] a) Whether the same device can act as connectable peripheral + Central + Non-Connectable peripheral.[/quote]

Yes, that is possible.

[quote user="beemavishnu"]What does “least 1 Peripheral + 8 Central + Broadcaster roles in parallel" mean.[/quote][quote user="beemavishnu"] b) What does 8 central mean.[/quote]

This is outdated information for the old versions of the SoftDevice(version 1, 2 and 3). In these old versions the SoftDevice, it could be configured with one connections as a Peripheral and up to eight connections as a Central. Starting from SoftDevice version 4, this was improved, and we now support 20 connections (freely selectable role (Central/Peripheral) for each link)

BR,

Sigurd

RE: Different capabilities on BLE peripheral device with multi-link, multi-peripheral and multi-role features

beemavishnu — Thu, 07 May 2020 18:16:19 GMT

Thank you for your detailed inputs. My further quires are:

What does “least 1 Peripheral + 8 Central + Broadcaster roles in parallel" mean.

a) Whether the same device can act as connectable peripheral + Central + Non-Connectable peripheral.

b) What does 8 central mean.

Thanks & Regards

Vishnu Beema

RE: Different capabilities on BLE peripheral device with multi-link, multi-peripheral and multi-role features

Sigurd — Thu, 07 May 2020 16:15:50 GMT

Hi,

1) Correct.

2) Correct. With the S132/S140 SoftDevice on nRF52-series you can have max 20 links, freely configurable roles. A device can have e.g.

20 central links
19 central links 1 peripheral
10 central links 10 peripheral
19 peripheral links and 1 central
20 peripheral links
15 peripheral links 5 central
etc, etc

You might find this multilink demo relevant: https://www.youtube.com/watch?v=tbl6Dui-_w4

3) Correct.

4) I think this means that you cannot suddenly change your role while you are in a active connection.

5) Two masters cannot communicate with each other directly, one device need to be the slave. But a device can both be a central for one device, and a peripheral for another device at the same time. E.g. in ble_app_hrs_rscs_relay example. The relay is both central and peripheral.

BR,

Sigurd