text: #ifndef _UTILITY_H
  #define _UTILITY_H
  
  
  //KeyValueString
  static const char* KV_DELIMITER  =  ";";
  static String KV_DIVIDER         =  "&";
  
  int countChar(String inStr, char letter);
  String valueOfKeyValueStr(String input, String key);
  char* stringToChar(String command);
  String toMD5(String input);
  String toHmacMD5(String message, String key);
  void serPrint(String message, int logMode);
  String toBufferMeasure (float x, float y, float z, String ts, int useServerTime, String bufferStr);
  String toBufferMeasureCSV (float x, float y, float z, String ts, int useServerTime, String bufferStr);
  String urlencode(String str);
  
  #endif 
  