gnrc_netif: Introduce GNRC_NETIF_HDR_FLAGS_MORE_DATA

sys/include/net/gnrc/netif/hdr.h

@@ -70,6 +70,21 @@ extern "C" {
  *          this flag the same way it does @ref GNRC_NETIF_HDR_FLAGS_BROADCAST.
  */
 #define GNRC_NETIF_HDR_FLAGS_MULTICAST  (0x40)
+
+/**
+ * @brief   More data will follow
+ *
+ * @details This flag signals that this packet is part of a burst of packets.
+ *          The link layer implementation can choose to translate this flag into
+ *          frame header bits to tell the remote node that more traffic will
+ *          follow shortly. The most direct use case for this flag is to set it
+ *          for fragmented packets in duty cycled networks to tell the remote
+ *          node to keep its radio turned on after receiving the first fragment.
+ *
+ * @see     The corresponding bit in the IEEE 802.15.4 frame control field,
+ *          @ref IEEE802154_FCF_FRAME_PEND
+ */
+#define GNRC_NETIF_HDR_FLAGS_MORE_DATA  (0x10)
 /**
  * @}
  */