#include <Arduino.h>
// callback function pointer definiton
typedef void (* CommandCallback)(char*); //!< command callback function pointer
class Command
{
  public:
    void add(char* id , CommandCallback onCommand);
    void run(char* str);
    void scalar(float* value,  char* user_cmd);
    bool isSentinel(char* ch,char* str);
  private:
      // Subscribed command callback variables
      CommandCallback call_list[20];//!< array of command callback pointers - 20 is an arbitrary number
      char* call_ids[20]; //!< added callback commands
      int call_count;//!< number callbacks that are subscribed
  
};