Security protocols are no longer started second time on authenticator

When initial EAPOL-Key is received, authenticator now checks whether
the authentication protocol, which would be triggered, is already ongoing,
and ignores message if it is. This filters the EAPOL-Key messages
received several times (due to lower layer retransmissions).

Author: Mika Leppänen

source/6LoWPAN/ws/ws_pae_auth.c

@@ -862,6 +862,11 @@ static void ws_pae_auth_next_kmp_trigger(pae_auth_t *pae_auth, supp_entry_t *sup
     if (next_type == KMP_TYPE_NONE) {
         // All done
         return;
+    } else {
+        if (ws_pae_lib_kmp_list_type_get(&supp_entry->kmp_list, next_type) != NULL) {
+            tr_info("KMP already ongoing; ignored, eui-64: %s", trace_array(kmp_address_eui_64_get(supp_entry->addr), 8));
+            return;
+        }
     }
 
     // Increases waiting time for supplicant authentication