Old local changes from desktop pc

firmware/lib/logging/Logger.h

@@ -22,6 +22,8 @@ class Logger
 public:
   using NtpTimeT = unsigned long;
 
+  static constexpr int HEADER_SIZE = sizeof(NtpTimeT) + sizeof(millis());
+
   ~Logger();
 
   template <class... Args>
@@ -53,6 +55,11 @@ public:
   static void init();
   static void setNtpTime(NtpTimeT time);
 
+
+  const size_t totalSize() const { return totalSize_; }
+  const size_t currentSize() const { return currentSize_; }
+  const char * data() const { return data_; }
+
 private:
   Logger();