It's worth noting that there are self-hostable XMPP-based implementations for this: https://unifiedpush.org/users/distributors/conversations/ https://unifiedpus

It's worth noting that there are self-hostable XMPP-based implementations for this: https://unifiedpush.org/users/distributors/conversations/ https://unifiedpush.org/users/distributors/conversations/ What is old is new again (Google used XMPP for Android Push Notifications before they switched to something else).