Print micro seconds since epoch.

coupler/opc-ua-server/common.h

@@ -2,8 +2,19 @@
  * See http://creativecommons.org/publicdomain/zero/1.0/for more information. */
 #define countof(a) (sizeof(a)/sizeof(*(a)))
 
+#include <sys/time.h>
+#include <stdio.h>
+
 #include <open62541/server.h>
 
+
+int getMicroSeconds() {
+  struct timeval current_time;
+  gettimeofday(&current_time, NULL);
+  long int ms = current_time.tv_sec * 1000 + current_time.tv_usec / 1000;
+  return ms;
+}
+
 /* loadFile parses the certificate file.
  *
  * @param  path               specifies the file name given in argv[]

coupler/opc-ua-server/keep_alive_subscriber.h

@@ -28,12 +28,14 @@ static void dataChangeNotificationCallback(UA_Server *server, UA_UInt32 monitore
                                void *monitoredItemContext, const UA_NodeId *nodeId,
                                void *nodeContext, UA_UInt32 attributeId,
                                const UA_DataValue *var) {
+    long int micro_seconds = getMicroSeconds();
+
     // filter out ID from Data Set
     if(UA_Variant_hasScalarType(&var->value, &UA_TYPES[UA_TYPES_UINT32])) {
         unsigned int coupler_id = *(UA_UInt32*) var->value.data;
         if (coupler_id!=COUPLER_ID) {
           // care for other coupler_id NOT ourselves
-          UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_USERLAND, "ID = %d", coupler_id);
+          UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_USERLAND, "ID = %d, microseconds=%ld", coupler_id, micro_seconds);
         }
     }