How to organize instant data transfer between mobile applications?

Question

Mobile development

The application must be installed on two android phones (later - android+iphone).
One application, when tapping/moving across the screen, should instantly transfer data over the Internet to another application.
Is there already a ready-made technology for transferring multi-byte data at a rate of up to 5 data per second? Is it possible to not use the server? If you need a server, what do you recommend?

Answer 1

The fastest data transfer will be via Direct WiFi, but both devices must be within range of the WiFi connection, i.e. physically nearby.
"5 data per second" cannot be transmitted. You can transfer several bytes per second.) Here a giant problem appears - lags. Transferring 5 bytes on a megabit connection can be faster than transferring 5 bytes on a gigabit connection, due to the size of packets, windows, and other nasty things. Those. the word "instantly" will be much more difficult to provide than "transfer 5 bytes once per second".

Answer 2

If the phones are on the same network, then peer then peer, if not, then you need a server ─ there is something fast on sockets