Add footprint test sketch. It uses a volatile variable trick to estimate how much memory does Blynk library use.
Add footprint test sketch.
It uses a volatile variable trick to estimate how much memory does
Blynk library use.

ivankravets/blynk-library,blynkkk/blynk-library,blynkkk/blynk-library,ivankravets/blynk-library,ivankravets/blynk-library,blynkkk/blynk-library,ivankravets/blynk-library,blynkkk/blynk-library,ivankravets/blynk-library,blynkkk/blynk-library