text: 
  #pragma once
  
  
  
  class NodeId
  {
  
  public:
     NodeId();
  
     const char* get();
     void set(const char* node_id);
     
  private:
     uint16_t eeprom_crc16_(size_t len);
     
     static const int node_id_len_ = 5;
     char node_[node_id_len_ + 1];
  };
  
  
  
  
  