From 2b632bd229edaa9999be5043f9a8ae2ac7d17e41 Mon Sep 17 00:00:00 2001
From: Thomas Vanbesien <tvanbesi@proton.me>
Date: Thu, 19 Feb 2026 06:19:23 +0100
Subject: Add configurable variable node initialization for server_register

New optional CLI argument [nodes-config] lets the server populate its
address space from a dot-indexed config file (node.N.name/type/value/
accessLevel/description).  Supports 10 scalar types plus 1D arrays.
---
 src/server_register.c | 39 ++++++++++++++++++++++++++++++++++++---
 1 file changed, 36 insertions(+), 3 deletions(-)

(limited to 'src/server_register.c')

diff --git a/src/server_register.c b/src/server_register.c
index b1d87fd..b938ca4 100644
--- a/src/server_register.c
+++ b/src/server_register.c
@@ -10,6 +10,7 @@
 
 #include "common.h"
 #include "config.h"
+#include "nodes_config.h"
 
 #include <open62541/client.h>
 #include <open62541/client_config_default.h>
@@ -110,18 +111,36 @@ main (int argc, char **argv)
   signal (SIGINT, _s_stop_handler);
   signal (SIGTERM, _s_stop_handler);
 
-  if (argc < 4 || argc > 5)
+  if (argc < 4 || argc > 6)
     {
       UA_LOG_FATAL (UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
                     "Usage: %s <server-config> <client-config> "
-                    "<discovery-url> [log-level]",
+                    "<discovery-url> [nodes-config] [log-level]",
                     argv[0]);
       return EXIT_FAILURE;
     }
 
   const char *discovery_endpoint = argv[3];
 
-  const char *log_level_str = (argc == 5) ? argv[4] : "info";
+  /* Parse the optional [nodes-config] and [log-level] arguments.
+     When only one optional arg is given, disambiguate by checking
+     whether it is a valid log-level name. */
+  const char *nodes_config_path = NULL;
+  const char *log_level_str = "info";
+
+  if (argc == 6)
+    {
+      nodes_config_path = argv[4];
+      log_level_str = argv[5];
+    }
+  else if (argc == 5)
+    {
+      if (parse_log_level (argv[4]) >= 0)
+        log_level_str = argv[4];
+      else
+        nodes_config_path = argv[4];
+    }
+
   int log_level = parse_log_level (log_level_str);
   if (log_level < 0)
     {
@@ -139,6 +158,7 @@ main (int argc, char **argv)
   config client_cfg = { 0 };
   security_config server_sec = { 0 };
   security_config client_sec = { 0 };
+  nodes_config nodes_cfg = { 0 };
   UA_Server *server = NULL;
 
   if (config_load (argv[1], &server_cfg) != 0)
@@ -198,6 +218,18 @@ main (int argc, char **argv)
   server_config->applicationDescription.applicationType
       = UA_APPLICATIONTYPE_SERVER;
 
+  /* ── Load and create variable nodes (optional) ───────────── */
+
+  if (nodes_config_path)
+    {
+      if (nodes_config_load (nodes_config_path, &nodes_cfg) != 0)
+        goto cleanup;
+
+      if (nodes_cfg.count > 0 && nodes_config_add (server, &nodes_cfg) != 0)
+        UA_LOG_WARNING (UA_Log_Stdout, UA_LOGCATEGORY_SERVER,
+                        "Some nodes failed to initialize");
+    }
+
   lds_client_params lds_params = {
     .app_uri = client_app_uri,
     .sec = client_sec,
@@ -250,6 +282,7 @@ main (int argc, char **argv)
 cleanup:
   if (server)
     UA_Server_delete (server);
+  nodes_config_free (&nodes_cfg);
   free_trust_store (client_sec.trust_paths, client_sec.trust_size);
   free_trust_store (server_sec.trust_paths, server_sec.trust_size);
   config_free (&client_cfg);
-- 
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