There are several things that make this difficult. Much of the difficulty relates to the device changing it's network address. Seamless transition requires that the application can:
- Find the new address; i.e. Cell provider vs. Residential/Business ISP - Associate the new address with the same flow - Duplicate packets and reassemble them, or change to "better" path interface.
Re:Protocol Wars
by londons_explore on Thursday May 11, 2023 @02:19PM
(#35906113)
On both android and iOS, a regular app can't choose to send packets over both 5G and wifi at the same time. Thats needed to setup a new connection while still using the old one.
I was pretty sure that android and iOS both have apis for apps to choose between 'whatever is best', 'wifi preferred' and 'cellular preferred'?
I don't know the details, but some iOS network apis (Network Kit?) allow you to set a required interface type somehow. https://developer.apple.com/documentation/network/nwparamete...
Why not? It is not obvious to me why a seamless transition is impossible?
Isn't the whole point of TCP that individual packets can take different paths over different networks and when they reach the destination they can be sequenced? Why should changing the network disrupt the individual packets from traveling independently?