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I want to create connection between app (in mobile device) and server.
Also it would be great to send some info at a time to app and that server would know if that info reached app.
Has anyone tried this?
I would appreciate for any information.
I’ve tried that for iOS, actually it was an app that required synchronising several devices across a network.
To achieve what you want you need to use sockets. There are two kinds of sockets: TCP and UDP. These are protocols that run on the protocol OSI layer. Read more about TCP/IP stack here.
When you read all this you will understand why you need to use sockets, and specifically TCP sockets, which are the ones than can ensure delivery.
For iOS, I recommend using CocoaAsyncSocket, a third party library that substantially leverages the hassle of using sockets at a low level.
For Android I can’t tell you right away, but I’ve used java.net.socket in the past with success, but I’m sure a google search will point you in the right direction.