We completed this project with my university classmate @electricalgorithm in 2021. But now I'm adding it to my github.
This repository made by İstanbul Üniversitesi-Cerrahpaşa Sustainable Energy Research Laboratuary BSc. Students. You must have server files (invisible defender server) in order to connect it from the application.
Contributors: @electricalgorithm and @sir-user
To connect the mobile application to the server, the Raspberry Pi needs to create a hotspot wifi. In this way, you can connect to this wifi area with your phone and run the application.
This YouTube link shows you how to do this.