Battery Optimization When App Sync is Blocked by VPN, Firewall or caused by Server-End Failure

Would it be possible to add a customized, app-level server reachability check before trying synchronization? This could help prevent redundant sync attempts when the app is effectively blocked by the VPN.

Here are some references that may help:

[StackOverflow: Server reachability check](https://stackoverflow.com/a/4009133/18154447)
[StackOverflow: Server reachability check 2](https://stackoverflow.com/questions/9570237/android-check-internet-connection)
[DAVx⁵ solution for handling VPN-related sync issues](https://github.com/bitfireAT/davx5-ose/commit/318939e970297e9d491b82cbe5238adea82fd969)

Related Issues:
https://github.com/home-assistant/android/issues/3464
https://github.com/home-assistant/android/issues/3636

Thank you!