As a storage server for users and chats i used the back4app which configuration with this app can be accessed via the following link: https://www.back4app.com/docs/android/android-project-with-source-code-download
As a storage server for users and chats i used the back4app which configuration with this app can be accessed via the following link: https://www.back4app.com/docs/android/android-project-with-source-code-download