Openthread RCP NoBufs

RE: Openthread RCP NoBufs

Jørgen Holmefjord — Thu, 28 Apr 2022 13:12:46 GMT

Hi,

Sorry for the slow response. I received some suggestions from our Thread team:

Firstly, we would recommend you to build the RCP from latest release of nRF Connect SDK (v1.9.1).
The NoBuf error is most likely coming from too few buffers (configured by CONFIG_NRF_802154_RX_BUFFERS).
We recommend you to not use the overlay-minimal_rcp.conf, as this is not working optimal. Use the overlay-rcp.conf instead.
You should not pass the overlay.conf file to the "-DCONF_FILE" argument, as this will replace the default prj.conf file. The overlay.conf fils are intended to overlay the relevant configs, not replace all. You should not need to set symbols like "NRF_802154_ENCRYPTION", etc, as these are defined in the default config.
If you want to enable Thread 1.2 support, you should set the Kconfig "CONFIG_OPENTHREAD_THREAD_VERSION_1_2=y".

Recommended command to build the RCP:

west build -b nrf52840dk_nrf52840 nrf/samples/openthread/coprocessor -p -- -DOVERLAY_CONFIG='overlay-logging.conf overlay-usb.conf overlay-rcp.conf' -DDTC_OVERLAY_FILE=usb.overlay -DCONFIG_OPENTHREAD_THREAD_VERSION_1_2=y

Let me know if this helps resolve the issue, or if we need to do some further investigations or debugging of the problem.

Best regards,
Jørgen

RE: Openthread RCP NoBufs

Rodrigo Brochado — Tue, 12 Apr 2022 14:10:48 GMT

Hi Jørgen,

Did you get any suggestions from the Thread team?

Thanks.

RE: Openthread RCP NoBufs

Rodrigo Brochado — Thu, 07 Apr 2022 19:16:52 GMT

Hi,

CONFIG_OPENTHREAD_NUM_MESSAGE_BUFFERS was already increased to 4096 on border router. At the RCP side, I understand that the RCP stack doesn't use the Openthread message buffers right?

I increased it anyway to 4096 on RCP and it didn't work either. I'm suspecting the problem is on the RCP because the border router logs the error as [WARN]-PLAT---- and plat would mean platform.

Besides, the RCP seems to be crashing some times.

In overlay-minimal_rcp.conf I did not set the sl opensource and mbedtls kconfig flags, so it could use NCS proprietary ones (CONFIG_NRF_802154_SL_OPENSOURCE and CONFIG_OPENTHREAD_MBEDTLS_CHOICE lines deleted). I suppose it should work, right?

Thanks!

RE: Openthread RCP NoBufs

Jørgen Holmefjord — Tue, 05 Apr 2022 13:27:57 GMT

Hi,

Have you tried increasing the CONFIG_OPENTHREAD_NUM_MESSAGE_BUFFERS config? If this does not help, I will check with our Thread team if they have some suggestions what could be causing the error, and how to fix it.

Best regards,
Jørgen