[riot-notifications] [RIOT-OS/RIOT] examples: small fixes (#16299)

chrysn notifications at github.com
Sat Apr 10 21:48:05 CEST 2021

On Sat, Apr 10, 2021 at 12:29:37PM -0700, benpicco wrote:
> I'm not sure why `CONFIG_GNRC_PKTBUF_SIZE` was reduced here from the default 6144 Bytes.
> But with 1024 byte CoAP blocks instead of 128 Bytes, this is no longer enough. 

Sorry, I didn't find that default earlier when I did the reviewing from
mobile -- kind of makes sense. I'd still like to understand better why
the 2kiB buffer is insufficient (there should only ever be one message
in flight, one of them being the requested 1200 byte data chunk, and the
request that's still around while that is being received into the 2k
receive buffer sits in the Gcoap retransmit buffer and not in GNRC).

(Good enough for the PR anyway; once the Python aspect is answered I can
ACK this.)

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