net: l2: ieee802154: document non-standard ACK feature selection

For IEEE 802.15.4 compliance, the NET_L2_IEEE802154_ACK_REPLY option must
automatically be active if the radio driver does not AUTOACK and inactive
otherwise. No user interaction is required.

Future changes will deprecate this option and replace it by a standard
compliant automatic mechanism.

Signed-off-by: Florian Grandel <[email protected]>

Author: fg-cfh

subsys/net/l2/ieee802154/Kconfig

@@ -65,6 +65,11 @@ config NET_DEBUG_L2_IEEE802154_DISPLAY_PACKET_TX
 
 endchoice
 
+# TODO: For IEEE 802.15.4 compliance, this option will be removed in the future.
+#       Acknowledgment is mandatory if requested by the package's "ACK requested"
+#       flag. Drivers with hardware ACK support and otherwise the L2 layer will
+#       have to ensure that compliant ACK packages will always be sent out automatically
+#       as required by the standard.
 config NET_L2_IEEE802154_ACK_REPLY
 	bool "IEEE 802.15.4 ACK reply logic"
 	help