Replace static node values with random updates every second

Remove the value field from nodes config — nodes are now created with
zero-initialized values, then randomized at startup and every 1000ms
via UA_Server_addRepeatedCallback. This is intended for testing OPC UA
monitoring and subscriptions.

1 files changed, 16 insertions, 2 deletions

diff --git a/src/nodes_config.h b/src/nodes_config.h
index 0207a55..cb42942 100644
--- a/src/nodes_config.h
+++ b/src/nodes_config.h
@@ -8,7 +8,8 @@
  * Reads a config file containing node.N.field entries, parses them into
  * an array of node descriptors, and creates corresponding OPC UA variable
  * nodes in the server address space.  Each node gets a string NodeId in
- * namespace 1 (ns=1;s=<name>).
+ * namespace 1 (ns=1;s=<name>).  Nodes are created with zero-initialized
+ * values; call nodes_config_randomize() to assign random values.
  *
  * Supported types (scalar and 1D array via "type[]" suffix):
  *   bool, int16, uint16, int32, uint32, int64, uint64, float, double, string
@@ -62,7 +63,6 @@ typedef struct
   char *description;   /**< Optional description text (NULL when absent). */
   node_type type;      /**< OPC UA data type. */
   UA_Boolean is_array; /**< true when the type name ended with "[]". */
-  char *value_str;     /**< Raw value string (comma-separated for arrays). */
   node_access_level access; /**< Read or read-write. */
 } node_config;
 
@@ -114,6 +114,20 @@ int nodes_config_load (const char *path, nodes_config *out);
 int nodes_config_add (UA_Server *server, const nodes_config *nc);
 
 /**
+ * @brief Writes random values to all configured variable nodes.
+ *
+ * Generates a random value appropriate for each node's type and writes
+ * it to the server using UA_Server_writeValue.  For array nodes, each
+ * element is randomized independently.  Call srand() before the first
+ * invocation to seed the random number generator.
+ *
+ * @param server  The UA_Server containing the nodes.
+ * @param nc      The parsed nodes configuration.
+ * @return 0 when all nodes were updated, -1 if any write failed.
+ */
+int nodes_config_randomize (UA_Server *server, const nodes_config *nc);
+
+/**
  * @brief Frees all memory owned by a nodes_config structure.
  *
  * After this call the structure is zeroed and must not be used