Add UUID of the coupler to the published data set.

coupler/opc-ua-server/server.c

@@ -228,15 +228,21 @@ int main(int argc, char **argv)
     #endif
 
     // enable keep-alive
-    UA_Float defaultFloat = 0;
-    UA_Double defaultDouble = 0;
     UA_Int64  defaultInt64 = 0;
     const PublishedVariable publishedVariableArray[] = {
+        // representing time in millis since start of process
         {
             .name = "heart_beat",
             .description = "Heart beat",
             .pdefaultValue = &defaultInt64,
             .type = UA_TYPES[UA_TYPES_INT64]
+        },
+        // represnting the UUID of the coupler
+        {
+            .name = "uuid",
+            .description = "UUID",
+            .pdefaultValue = &defaultInt64,
+            .type = UA_TYPES[UA_TYPES_INT64]
         }
     };
 

coupler/opc-ua-server/server_subscribe.c

@@ -198,11 +198,11 @@ static void fillTestDataSetMetaData(UA_DataSetMetaDataType *pMetaData) {
     /* Static definition of number of fields size to 4 to create four different
      * targetVariables of distinct datatype
      * Currently the publisher sends only DateTime data type */
-    pMetaData->fieldsSize = 1;
+    pMetaData->fieldsSize = 2;
     pMetaData->fields = (UA_FieldMetaData*)UA_Array_new (pMetaData->fieldsSize,
                          &UA_TYPES[UA_TYPES_FIELDMETADATA]);
 
-    /* DateTime DataType */
+    /* heartbeat */
     UA_FieldMetaData_init (&pMetaData->fields[0]);
     UA_NodeId_copy (&UA_TYPES[UA_TYPES_INT64].typeId,
                     &pMetaData->fields[0].dataType);
@@ -210,6 +210,13 @@ static void fillTestDataSetMetaData(UA_DataSetMetaDataType *pMetaData) {
     pMetaData->fields[0].name =  UA_STRING ("Heartbeat (subscribed)");
     pMetaData->fields[0].valueRank = -1; /* scalar */
 
+    // UUID
+    UA_FieldMetaData_init (&pMetaData->fields[1]);
+    UA_NodeId_copy (&UA_TYPES[UA_TYPES_INT64].typeId,
+                    &pMetaData->fields[1].dataType);
+    pMetaData->fields[1].builtInType = UA_NS0ID_INT64;
+    pMetaData->fields[1].name =  UA_STRING ("UUID (subscribed)");
+    pMetaData->fields[1].valueRank = -1; /* scalar */
 }
 
 /**