ble_mesh: stack: Add filter old seq_auth packet menuconfig

components/bt/esp_ble_mesh/Kconfig.in

@@ -1094,6 +1094,13 @@ if BLE_MESH
             lets the state to be changed at any time.
             If IV Update test mode is going to be used, this option should be enabled.
 
+    config BLE_MESH_DISCARD_OLD_SEQ_AUTH
+        bool
+        default y
+        help
+            This option is used to decide whether discarding the old SeqAuth when
+            receiving a segmented message.
+
     menu "BLE Mesh specific test option"
 
         config BLE_MESH_SELF_TEST

components/bt/esp_ble_mesh/mesh_core/transport.c

@@ -1396,13 +1396,14 @@ static struct seg_rx *seg_rx_find(struct bt_mesh_net_rx *net_rx,
             continue;
         }
 
-        /* Return newer RX context in addition to an exact match, so
-         * the calling function can properly discard an old SeqAuth.
-         * Note: in Zephyr v1.14.0, ">=" is used here which does not
-         * seem to be a right operation, hence we still use the original
-         * "==" here.
+        /* When ">=" is used, return newer RX context in addition to an exact match,
+         * so the calling function can properly discard an old SeqAuth.
          */
+#if CONFIG_BLE_MESH_DISCARD_OLD_SEQ_AUTH
+        if (rx->seq_auth >= *seq_auth) {
+#else
         if (rx->seq_auth == *seq_auth) {
+#endif
             return rx;
         }