Reintroducing wallclock

lib/Logging/Logging.cpp

@@ -1,6 +1,7 @@
 #include "Logging.h"
 
 #include <HalClock.h>
+#include <algorithm>
 
 #include <string>
 
@@ -40,10 +41,17 @@ void logPrintf(const char* level, const char* origin, const char* format, ...) {
   va_start(args, format);
   char buf[MAX_ENTRY_LEN];
   char* c = buf;
-  // add timestamp, level and origin
+  // add timestamp, wall clock, level and origin
   {
     unsigned long ms = millis();
-    int len = snprintf(c, sizeof(buf), "[%lu] [%s] [%s] ", ms, level, origin);
+    char wallClock[12];
+    HalClock::formatLogTime(wallClock, sizeof(wallClock));
+    int len;
+    if (wallClock[0] != '\0') {
+      len = snprintf(c, sizeof(buf), "[%lu %s] [%s] [%s] ", ms, wallClock, level, origin);
+    } else {
+      len = snprintf(c, sizeof(buf), "[%lu] [%s] [%s] ", ms, level, origin);
+    }
     // error while writing => return
     if (len < 0) {
       va_end(args);