mcumgr: Probably incorrect error handling with udp backend

[eobalski]

In case there is no free space for mcumgr buffer, received data are probably
inproperly dropped smp_udp.c:114-127.

For more information refer to:
#37105
#37081

[github-actions]

This issue has been marked as stale because it has been open (more than) 60 days with no activity. Remove the stale label or add a comment saying that you would like to have the label removed otherwise this issue will automatically be closed in 14 days. Note, that you can always re-open a closed issue at any time.

[carlescufi]

@emob-nordic are you looking into this?

[eobalski]

@carlescufi I'm not. I was told in the past to write this issue so someone competent could address it later.

[carlescufi]

@aunsbjerg could you please take a look at this issue?

[aunsbjerg]

@carlescufi I will try, but am a bit pressed for time, so it will be a few days before I can do anything

[github-actions]

This issue has been marked as stale because it has been open (more than) 60 days with no activity. Remove the stale label or add a comment saying that you would like to have the label removed otherwise this issue will automatically be closed in 14 days. Note, that you can always re-open a closed issue at any time.