Hi guys, i have a problem with my blynk app push notifications, the code and widgets are working but i do not receive notification whenever the app is closed

I guess it’s an issue with notification permissions on your phone, but you have other issues with your sketch, as you’ll quickly use-up yout 100 events per 24 hour period with yout code.
You’re calling mySensor() twice oper sendond, so after 50 seconds where fire_Val == LOW you’ll have logged your 100 event limit.

You should read this…