text: #ifndef _DEV_INFO_H_
  #define _DEV_INFO_H_
  
  /* for demo only, subject to change to user's specific ones. */
  #define PRODUCT_ID     1762552
  #define DEVICE_SECRET  "QnYHmmhdeNKWigFhaE0HB8DnScPdV9km"
  #define DEVICE_NAME    "John_test"
  #define PRODUCT_KEY    "a1tvASemeJf"
  #define PRODUCT_SECRET "dqBnLjgaPhReAMr6"
  
  #endif
  