Max connections count in SDK 12.2

[SultanArabi]

When I try to increase the CENTRAL_LINK_COUNT from 8 to 9 in  ble_app_multilink_central example, I got this error NRF_ERROR_CONN_COUNT. Is there a way to increase the max connections to 20? 

Also, does SDK 12.2 support multi-peripheral links (one peripheral connected to multi central)?

Hint:

• I'm using NRF52 not NRF51.
• SD 132 version 3.0.0

[awneil]

SultanArabi said:

I got this error

Where, exactly, did you get that error ?

I don't know about SDK 12.2, but by v15 there were separate counts for Central and Peripheral links - so are you sure you updated the right one?

There might also be another separate "total links" count ...

[SultanArabi]

In SDK 12.2 the CENTRAL_LINK_COUNT and PERIPHERAL_LINK_COUNT are defined in the main.c and are passed to the SD like this:

ble_enable_params_t ble_enable_params;
    err_code = softdevice_enable_get_default_config(CENTRAL_LINK_COUNT,
                                                    PERIPHERAL_LINK_COUNT,
                                                    &ble_enable_params);
    APP_ERROR_CHECK(err_code);

    // Use the max config: 8 central, 0 periph, 10 VS UUID
    ble_enable_params.common_enable_params.vs_uuid_count = 10;

    // Check the ram settings against the used number of links
    CHECK_RAM_START_ADDR(CENTRAL_LINK_COUNT,PERIPHERAL_LINK_COUNT);

    // Enable BLE stack.
#if (NRF_SD_BLE_API_VERSION == 3)
    ble_enable_params.gatt_enable_params.att_mtu = NRF_BLE_MAX_MTU_SIZE;
#endif
    err_code = softdevice_enable(&ble_enable_params);
    APP_ERROR_CHECK(err_code);

and I got this error:

[Turbo J]

The support for 20 connections in softdevice S132 came with version 5.0.0 according to the release notes - that is probably too new for SDK12.

Which version do you use?

[awneil]

SultanArabi said:

I try to increase the CENTRAL_LINK_COUNT from 8 to 9

The code you posted suggests that the maximum is only 8:

SultanArabi said:

// Use the max config: 8 central, 0 periph, 10 VS UUID

You need to check the specific documentation for the version you are using

[SultanArabi]

Thank you for your co-operation.

Yes, I noticed that, but as you know, the comment isn't evidence and thought that maybe a configuration or patch that fixes this issue.