[core] send frequency calculation fixed in case of unconnected publis…

…her (#1606)

ecal/core/src/readwrite/ecal_writer.cpp

@@ -1,6 +1,6 @@
 /* ========================= eCAL LICENSE =================================
  *
- * Copyright (C) 2016 - 2019 Continental Corporation
+ * Copyright (C) 2016 - 2024 Continental Corporation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -233,13 +233,6 @@ namespace eCAL
 
   size_t CDataWriter::Write(CPayloadWriter& payload_, long long time_, long long id_)
   {
-    {
-      // we should think about if we would like to potentially use the `time_` variable to tick with (but we would need the same base for checking incoming samples then....
-      const auto send_time = std::chrono::steady_clock::now();
-      const std::lock_guard<std::mutex> lock(m_frequency_calculator_mtx);
-      m_frequency_calculator.addTick(send_time);
-    }
-
     // get payload buffer size (one time, to avoid multiple computations)
     const size_t payload_buf_size(payload_.GetSize());
 
@@ -508,6 +501,15 @@ namespace eCAL
   {
     // increase write clock
     m_clock++;
+
+    // update send frequency
+    {
+      // we should think about if we would like to potentially use the `time_` variable to tick with (but we would need the same base for checking incoming samples then....
+      const auto send_time = std::chrono::steady_clock::now();
+      const std::lock_guard<std::mutex> lock(m_frequency_calculator_mtx);
+      m_frequency_calculator.addTick(send_time);
+    }
+
   }
 
   std::string CDataWriter::Dump(const std::string& indent_ /* = "" */)