How to keep Blynk running on the background?


I’ve made a plant watering system with Raspberry pi and blynk and the code works well. And I coded using node.js. Only problem is that the system will stop every time I close the blynk application on my phone. How I can make the system running while the phone is closed? When I looked information from the internet, some said that I should be using local servers or timers, but I don’t know how to use them. Thanks already for your help!

Just when I asked help I found this article that solved my problem: