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To minimize the program Flash/RAM, you can disable some of the built-in functionality:
Comment-out #define BLYNK_PRINT to remove prints
#define BLYNK_PRINT
Put on the top of your sketch:
#define BLYNK_NO_BUILTIN // Disable built-in analog & digital pin operations #define BLYNK_NO_FLOAT // Disable float operations
If you want to dive into crafting/hacking/porting Blynk library implementation, please also check .