change get_time_now_us function

README.md

@@ -4,10 +4,13 @@ Add a paragraph about the application here...
 
 ## Requirements
 
-- python3-dev;
-- libsctp-dev;
-- ninja-build;
-- swig v4.1 or newer;
+[//]: # (- python3-dev;)
+[//]: # (- libsctp-dev;)
+[//]: # (- ninja-build;)
+[//]: # (- swig v4.1 or newer;)
+
+- Ubuntu Server 24.04 LTS;
+- FlexRIC (available in: https://gitlab.eurecom.fr/mosaic5g/flexric)
 
 ## Getting Started
 
@@ -22,14 +25,14 @@ git clone --recurse-submodules -j8 [email protected]:gercom-ufpa/iqos-xapp.git
 Copy service models libraries to system.
 
 ```shell
+cd iqos-xapp
 sudo mkdir -p /usr/local/etc/
 sudo cp -R libs/serviceModels /usr/local/lib/flexric
 ```
 
 Build the xApp.
 
 ```shell
-cd iqos-xapp
 mkdir -p build && cd build
 cmake -GNinja -DCMAKE_BUILD_TYPE=Release -DE2AP_VERSION=E2AP_V3 -DKPM_VERSION=KPM_V3_00 ..
 ninja xapp_iqos

include/kpmManager.hpp

@@ -8,6 +8,7 @@
 #include "chrono"
 #include <cassert>
 #include <iostream>
+#include <cstdlib>
 
 namespace KpmManager
 {

src/kpmManager.cpp

@@ -293,9 +293,10 @@ namespace KpmManager
 
     u_int64_t get_time_now_us()
     {
-        auto now{std::chrono::high_resolution_clock::now()};
-        auto duration{std::chrono::duration_cast<std::chrono::microseconds>(now.time_since_epoch())};
-        return duration.count();
+        auto now = std::chrono::duration_cast<std::chrono::microseconds>(
+            std::chrono::system_clock::now().time_since_epoch()
+        );
+        return now.count();
     }
 
     // callback to handle return data from KPM subscription
@@ -319,16 +320,16 @@ namespace KpmManager
         kpm_ind_msg_format_3_t const* msg_frm_3{&ind->msg.frm_3}; // ind message
 
         static int counter = 1;
-        const u_int64_t now{get_time_now_us()};
 
         // create a new scope
         {
             pthread_mutex_lock(&mtx);
             defer(pthread_mutex_unlock(&mtx));
 
             // print latency xApp <-> E2 Node
-            printf("\n <--------------KPM ind_msg %d | latency = %ld [μs] --------------> \n", counter,
-                   now - hdr_frm_1->collectStartTime); // xApp <-> E2 Node
+            u_int64_t latency{get_time_now_us() - hdr_frm_1->collectStartTime};
+            printf("\n <--------------KPM ind_msg %d | latency = %lu [μs] --------------> \n", counter,
+                   latency); // xApp <-> E2 Node
 
             // SPDLOG_DEBUG("KPM ind_msg latency = {:d} [μs]",);