net: openthread: add OPENTHREAD_STORE_FRAME_COUNTER_AHEAD

Add `OPENTHREAD_STORE_FRAME_COUNTER_AHEAD` Kconfig option
and set it to 100000, as after calculations it appears to
be a more suitable value.

Signed-off-by: Maciej Baczmanski <maciej.baczmanski@nordicsemi.no>

modules/openthread/Kconfig.thread

@@ -187,13 +187,13 @@ config OPENTHREAD_BLE_TCAT_THREAD_STACK_SIZE
 	default 5120 if OPENTHREAD_CRYPTO_PSA
 	default 4200
 	help
-	   Openthread default TCAT stack size.
+	  Openthread default TCAT stack size.
 
 config OPENTHREAD_BLE_TCAT_RING_BUF_SIZE
 	int "Openthread BLE ringbuffer size"
 	default 512
 	help
-	   Openthread BLE TCAT ringbuffer size.
+	  Openthread BLE TCAT ringbuffer size.
 
 config OPENTHREAD_NAT64_CIDR
 	string "Set IPv4 CIDR used by NAT64"
@@ -204,3 +204,9 @@ config OPENTHREAD_NAT64_CIDR
 	  to set source address of the outgoing translated IPv4 packets.
 	  The CIDR must have four bytes in the address with the
 	  non-zero length of prefix (e.g., "127.0.0.1/24").
+
+config OPENTHREAD_STORE_FRAME_COUNTER_AHEAD
+	int "Openthread frame counter ahead value"
+	default 100000
+	help
+	  Openthread value ahead of the current frame counter for persistent storage.

modules/openthread/platform/openthread-core-zephyr-config.h

@@ -448,4 +448,14 @@
 #define OPENTHREAD_CONFIG_RADIO_STATS_ENABLE CONFIG_OPENTHREAD_RADIO_STATS
 #endif
 
+/**
+ * @def OPENTHREAD_CONFIG_STORE_FRAME_COUNTER_AHEAD
+ *
+ * The value ahead of the current frame counter for persistent storage.
+ *
+ */
+#ifdef CONFIG_OPENTHREAD_STORE_FRAME_COUNTER_AHEAD
+#define OPENTHREAD_CONFIG_STORE_FRAME_COUNTER_AHEAD CONFIG_OPENTHREAD_STORE_FRAME_COUNTER_AHEAD
+#endif
+
 #endif  /* OPENTHREAD_CORE_ZEPHYR_CONFIG_H_ */