Acces a variable in the library

[johnwasser]

@gfvalvo

Except, you'll note that the array is actually DEFINED as a free variable (not part of the class) in the header file, not just DECLARED.

Yikes!

If the #include file is use more than one place, you will get a doubly-defined variable. In that case, swap the two declarations. Put:
extern char kFirebaseFingerprint[60];
in the #include file and put this in your sketch:

char kFirebaseFingerprint[60] =
"6E:F3:55:47:6D:F1:0E:5B:2B:04:F2:F8:C0:8B:E8:05:65:0F:1A:C1"; // 2021-09