Use APKPure App
Get SMS Gate old version APK for Android
एंड्रॉयड सरल एसएमएस गेट, खुला स्रोत
Allows you to backup all your SMS to Gmail. Also have simple SMS scheduler with multi sim support, no ads, open-source, GPLv3. This app uses Accessibility services (optional).
Web Interface:
https://axet.gitlab.io/android-sms-gate/