Workaround for nrf_send known issue in nRF Connect SDK 1.2.0

[Cody]

Hello,

I noticed in the release notes for nRF Connect SDK v1.2.0 there is a known issue with the nrf_send function as it relates to blocking for several minutes, see below for the snippet as seen in the release notes:

* The :cpp:func:`nrf_send` function in the :ref:`nrfxlib:bsdlib` might be blocking for several minutes, even if the socket is configured for non-blocking operation.
The behavior depends on the cellular network connection.

I was curious if Nordic can recommend/provide a workaround for this issue. I am seeing instances where this function is blocking for 10+ minutes.

Thanks,
Cody

[Martin Lesund]

Hi Cody,

We are aware of this and there should come a new patch in "nrfxlib" in the near future in the NCS that will handle this.

There will be introduced timeout support in the send() function and support for the flag NRF_MSG_DONTWAIT on the send() function. In your case here it would return the error code "EAGAIN" if you would use this flag.

The only thing you would need to do is to update your code to understand/handle the return of the error codes "EAGAIN", "EWOULDBLOCK" or "ETIMEOUT" in the case you are using the timeout support.

Best regards,

Martin L.

[Cody]

Hi Martin,

Thank you for the response, do you know if there is a timeline for when this will be released and when it does will it be a patch/backport to 1.2.0 or is it going to be in the next quarterly release (ie v1.3.0)?

Thanks,
Cody

[Martin Lesund]

Hi Cody,
Roadmap questions should be directed to your RSM, I do not have the information about the timeline.(but from my understanding, it should happen in the "near future")

First, it will be merged in the master branch, which means it will also be in the next tagged release.

(I do not know if there will come a backport/patch to the v1.2.0 for this).

If you do not know who your RSM is please send me a PM on Devzone and I will provide the necessary information.

Best regards,
Martin L.

[Viet Nguyen]

Hi Martin,

How is the status of fixing of nrf_send issue now.

I'm using ncs 1.2.0 (rc2), also get issue as Cody ( i.e: return ENOCONT when calling nrf_send())

and this thread: https://devzone.nordicsemi.com/f/nordic-q-a/51007/bsd-library-nrf_connect-results-an-einprogress-error-when-non-blocking-is-enabled/206182#206182

Kind regards,

Viet Nguyen