diff --git a/dns_sd/rpt.cpp b/dns_sd/rpt.cpp
new file mode 100644
index 0000000..719ce4e
--- /dev/null
+++ b/dns_sd/rpt.cpp
@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "rpt.h"
+
+void vrpt( printCallback_t printCbFunc, const char* fmt, va_list vl )
+{
+  if( printCbFunc != nullptr )
+  {
+    const int bufN = 32;
+    char buf[bufN];
+    vsnprintf(buf,bufN,fmt,vl);
+    buf[bufN-1] = '\0';
+    printCbFunc(buf);
+  }
+}
+
+void rpt( printCallback_t printCbFunc, const char* fmt, ... )
+{
+  va_list vl;
+  va_start(vl,fmt);
+  vrpt(printCbFunc,fmt,vl);
+  va_end(vl);
+}
+
+
+void rptHex(  printCallback_t printCbFunc, const void* buf, unsigned bufByteN, const char* label, bool asciiFl )
+{
+  const unsigned char* data = static_cast<const unsigned char*>(buf);
+  const unsigned       colN = 8;
+  unsigned             ci   = 0;
+
+  if( label != nullptr )
+    rpt(printCbFunc,"%s\n",label);
+        
+  for(unsigned i=0; i<bufByteN; ++i)
+  {
+    rpt(printCbFunc,"%02x ", data[i] );
+
+    ++ci;
+    if( ci == colN || i+1 == bufByteN )
+    {
+      unsigned n = ci==colN ? colN-1 : ci-1;
+
+      for(unsigned j=0; j<(colN-n)*3; ++j)
+        rpt(printCbFunc," ");
+
+      if( asciiFl )
+      {
+        for(unsigned j=i-n; j<=i; ++j)
+          if( 32<= data[j] && data[j] < 127 )
+            rpt(printCbFunc,"%c",data[j]);
+          else
+            rpt(printCbFunc,".");
+      }
+      
+      rpt(printCbFunc,"\n");
+      ci = 0;
+    }
+  }  
+}
diff --git a/dns_sd/rpt.h b/dns_sd/rpt.h
new file mode 100644
index 0000000..7b3af4c
--- /dev/null
+++ b/dns_sd/rpt.h
@@ -0,0 +1,10 @@
+#ifndef rpt_h
+#define rpt_h
+
+typedef void (*printCallback_t)( const char* text );
+
+void vrpt(   printCallback_t printCbFunc, const char* fmt, va_list vl );
+void rpt(    printCallback_t printCbFunc, const char* fmt, ... );
+void rptHex( printCallback_t printCbFunc, const void* buf, unsigned bufByteN, const char* label = nullptr, bool asciiFl=true );
+
+#endif