static public String formatUInt8Char(byte b){
  String ch=new String(new byte[]{b});
  ch=ch.replaceAll("\\p{C}"," ");
  return formatUInt8(b) + ":" + ch;
}

static public String formatUInt8Char ( byte b ) { String ch = new String ( new byte [ ] { b } ) ; ch = ch . replaceAll ( "\\p{C}" , " " ) ; return formatUInt8 ( b ) + ":" + ch ; }
utility method to print a byte in hexa an ascii
