How to get the library’s version?
ArduinoJson comes with the four following macros:
#define ARDUINOJSON_VERSION "6.21.5"
#define ARDUINOJSON_VERSION_MAJOR 6
#define ARDUINOJSON_VERSION_MINOR 21
#define ARDUINOJSON_VERSION_REVISION 5
Here is how you can print ArduinoJson’s version:
Serial.print("Using ArduinoJson version ");
Serial.println(ARDUINOJSON_VERSION); // 6.21.5
Here is how you can test that the expected version is installed:
#if ARDUINOJSON_VERSION_MAJOR!=6 || ARDUINOJSON_VERSION_MINOR<21
#error ArduinoJson 6.21+ is required
#endif