[riot-notifications] [RIOT-OS/RIOT] drivers/at86rf215: Add driver for the AT86RF215 dual-band IEEE 802.15.4-2015 radio (#12128)
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Fri Sep 27 17:01:09 CEST 2019
Actually this is normal. [`_recv()`](https://github.com/RIOT-OS/RIOT/blob/master/sys/net/gnrc/netif/ieee802154/gnrc_netif_ieee802154.c#L100) calls it twice, first with `NULL` to determine the length of the packet and allocate a buffer for it, hen a second time to actually ready the packet.
You should see another call with `buffer != NULL`.
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