I want ot redirect my iPhone data to either wifi or Cellular. Based on some criteria. Is it possible to redirect whole of the iPhone data to a particular interface like to either wifi or cellular. ?
I heard that this can be done using VPN but no idea how it can be done. Any help on this?
By default, iOS help you with redirection when you have weak/good WiFi and switch on in Setting - WLAN Assist
MultiPath is a technology switching automatically by OS
Just read this Apple Doc for more help.
You can't manipulate it easily with high level API.
After all, changing device data flow is kind of low level thing. Just like NetworkExtension is Apple provided. As far as I know, Apple does not mention it in public.