As you probably know, Blynk is an App for iOS and Android, that allows you to drag-and-drop widgets right on your smartphone,
and use it to control/monitor things around you.
https://community.blynk.cc/uploads/default/optimized/2X/c/cfd0401b67e4bbe206d8f4823db901bb7f13c260_1_303x500.png

I've just ...