drivers/at86rf215: return ENETDOWN when interface is down [backport 2024.10] #21037
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Backport of #21031
Contribution description
We would return EBUSY when the interface was in sleep, this caused the gnrc_netif to retry sending forever. Return ENETDOWN instead.
I added three additional minor fixes to this to not bother CI with those trivial changes:
gnrc_netif
to tell apart the case where a pkt can't be queued and is dropped and where we try sending it insteadtx_frame_len
that has already been set inat86rf215_tx_load()
Testing procedure
Issues/PRs references