diff --git a/DbgTracePort.cpp b/DbgTracePort.cpp
index 61d0cd4..de5a19f 100644
--- a/DbgTracePort.cpp
+++ b/DbgTracePort.cpp
@@ -5,10 +5,10 @@
  *      Author: niklausd
  */
 
-#include "DbgTraceContext.h"
-#include "DbgTraceOut.h"
-#include "DbgTracePort.h"
-#include "DbgCliCommand.h"
+#include <DbgTraceContext.h>
+#include <DbgTraceOut.h>
+#include <DbgTracePort.h>
+#include <DbgCliCommand.h>
 
 #ifdef ARDUINO
 #include <Arduino.h>
@@ -17,6 +17,7 @@
 #endif
 #include <stdio.h>
 #include <string.h>
+#include <stdarg.h>
 
 //-----------------------------------------------------------------------------
 // concrete command class DbgCli_Command_ChangeOut
@@ -372,6 +373,16 @@ DbgTrace_Port::~DbgTrace_Port()
   }
 }
 
+void DbgTrace_Port::printStrFormat(const char* format, ...)
+{
+  char stream[s_cTraceBufSize];
+  va_list args;
+  va_start(args, format);
+  vsnprintf(stream, s_cTraceBufSize, format, args);
+  va_end(args);
+  printStr(stream);
+}
+
 void DbgTrace_Port::printStr(const char* str)
 {
   if(0 != m_out)
diff --git a/DbgTracePort.h b/DbgTracePort.h
index aa371d5..a005127 100644
--- a/DbgTracePort.h
+++ b/DbgTracePort.h
@@ -17,6 +17,7 @@ class DbgTrace_Context;
 class DbgTrace_Out;
 class DbgCli_Topic;
 
+#define TR_PRINTF(PORT, LEVEL, args...) do { if ((PORT)->getLevel()>=(LEVEL)) (PORT)->printStrFormat(args); } while (0);
 #define TR_PRINT_STR(PORT, LEVEL, MSG)  do { if (((PORT)->getLevel()>=(LEVEL))) (PORT)->printStr((MSG)); } while (0);
 #define TR_PRINT_LONG(PORT, LEVEL, MSG)  do { if (((PORT)->getLevel()>=(LEVEL))) (PORT)->printLong((MSG)); } while (0);
 #define TR_PRINT_DBL(PORT, LEVEL, MSG)  do { if (((PORT)->getLevel()>=(LEVEL))) (PORT)->printDbl((MSG)); } while (0);
@@ -104,6 +105,13 @@ class DbgTrace_Port
    */
   DbgTrace_Level::Level getLevel() { return m_level; }
 
+  /**
+   * @brief Helper method to print a formatted string. Don't call this function directly, use the defined macros.
+   * @param format Const char format string to be printed out.
+   * @param var_arg Variable list of paramters to be printed according to placeholders in the format string.
+   */
+  void printStrFormat(const char* format, ...);
+
   /**
    * @brief Helper method to print a string. Don't call this function directly, use the defined macros.
    * @param str Const char message to be printed out.
@@ -148,7 +156,7 @@ class DbgTrace_Port
   static const unsigned int s_cMaxPortTagLength = 16; /*!< Max. number of characters for a tag name of a trace port. */
   static const unsigned int s_cTestTimeStamp = 10; /*!< Max. number of characters for the printed time-stamp using the test environment. */
   static const unsigned int s_cArduinoTimeStamp = 12; /*!< Max. number of characters for the printed time-stamp using arduino. */
-  static const unsigned int s_cTraceBufSize = s_cMaxPortTagLength + s_cMaxPortTagLength + 40; /*!< Max. number of characters of the hole printed message. */
+  static const unsigned int s_cTraceBufSize = s_cMaxPortTagLength + s_cMaxPortTagLength + 100; /*!< Max. number of characters of the hole printed message. */
 
 private: