Can ble_app_multilink_central example connect to more than 8 peripheral devices?

RE: Can ble_app_multilink_central example connect to more than 8 peripheral devices?

Simonr — Tue, 25 Jun 2024 11:32:23 GMT

Indeed, you will need to adjust the RAM and Flash memory here to fit your needs. Please follow the adjustment of RAM/Flash memory guide here to do so. 20 total devices should be possible, but that is the absolute maximum you can use with the nRF5 SDK and SoftDevice. For more than that you need to move to the nRF Connect SDK.

Best regards,

Simon

RE: Can ble_app_multilink_central example connect to more than 8 peripheral devices?

Glenyz — Mon, 24 Jun 2024 17:47:00 GMT

I figured out how to view the debug messages and here's what I got:

<info> app_timer: RTC: initialized.
<debug> app: nrf_sdh_enable_request() returned: 0x0
<debug> app: nrf_sdh_ble_default_cfg_set() returned: 0x0
<warning> nrf_sdh_ble: Insufficient RAM allocated for the SoftDevice.
<warning> nrf_sdh_ble: Change the RAM start location from 0x200043A8 to 0x20004880.
<warning> nrf_sdh_ble: Maximum RAM size for application is 0x3B780.
<error> nrf_sdh_ble: sd_ble_enable() returned NRF_ERROR_NO_MEM.
<debug> app: nrf_sdh_ble_enable() returned: 0x4
<error> app: ERROR 4 [NRF_ERROR_NO_MEM] at ...

It looks like I need to allocate more memory for the RAM, but I'm not should how I should configure my RAM so that the solution does fit. Additionally, I hope to get up to 20 total devices connected, would that be feasible with the nrf52840 chip?

Best Regards,

Glen

RE: Can ble_app_multilink_central example connect to more than 8 peripheral devices?

Glenyz — Mon, 24 Jun 2024 16:59:27 GMT

Hi Simon,

Thanks for the reply. I am using the nrf5 sdk and altering the ble_app_multilink_central example. How do I enable debug logging in Segger IDE?

[quote userid="75734" url="~/f/nordic-q-a/112369/can-ble_app_multilink_central-example-connect-to-more-than-8-peripheral-devices/490279"]Does the DK not work or light up at all if you increase the TOTAL LINK COUNT of your project?[/quote]

Yes, the DK does not work or light up after I increase BLE_CENTRAL_LINK_COUNT and TOTAL_LINK_COUNT to 9. I pressed the BOOT/RESET button after I built and downloaded the solution onto the DK as well.

Best Regards,

Glen

RE: Can ble_app_multilink_central example connect to more than 8 peripheral devices?

Simonr — Mon, 24 Jun 2024 12:26:21 GMT

Does the DK not work or light up at all if you increase the TOTAL LINK COUNT of your project? What are you trying to set it to exactly? The maximum number of links will be 20, and the TOTAL_LINK_COUNT must be => BLE_CENTRAL_LINK_COUNT + BLE_PERIPHERAL_LINK_COUNT.

You should do some debugging to see what exactly is happening. Enable debug logging and see what return values are returned by I.E. the SoftDevice or BLE stack init function if setting this higher than 8.

Best regards,

Simon