The max connect device number of nRF51 s130 sdk9.0

[sq]

I run connectivity  of ble_central_and_peripheral example  s130 SDK9.0.

When NRF51 as central device, what the max it can connect with peripheral devices?

When NRF51 as peripheral device, what the max it can connect with central devices?

What the total number NRF51 can connect with other devices?

Is it need to make some change of the SDK?

[Jørgen Holmefjord]

Hi,

SDK v9.0.0 have support for s130 v1.0.0 softdevice. This is from the s130 SDS v1.0 (chapter 1):

The S130 SoftDevice is a Bluetooth Low Energy (BLE) central and peripheral protocol stack solution. It supports up to three connections as a central, one connection as a peripheral, an observer, and a broadcaster all running concurrently.

If you upgrade the SDK to SDK 11.0.0 or preferably latest SDK 12.3.0, this supports s130 v2.0.x softdevice. From s130 SDS v2.0 (chapter 1):

The S130 SoftDevice is a Bluetooth low energy (BLE) Central and Peripheral protocol stack solution. It supports up to eight connections with an additional Observer and a Broadcaster role all running concurrently.

And from chapter 11.4 (BLE role configuration):

The SoftDevice can be configured with one connections as a Peripheral and up to eight connections as a Central. The SoftDevice supports running one Advertiser or Broadcaster and one Scanner or Observer concurrently with the BLE connections.

If you need even more connections, you can upgrade to nRF52832/nRF52840, where the softdevices support up to 20 concurrent connections in any role.

Best regards,
Jørgen