Socket Server in Android and iOS

Question

Is possible to create a socket server (NOT socket client), in iOS and Android?

The socket server will (in iOS/Android) only listen to incoming clients and react only based on that.

Answer 1

Yes, you can!
just need to get phone IMEI Instead of user information!
but in this way don't need to sign up user
just need and in onResume get IMEI and send this to the server instead of user

Answer 2

Yes. And here is a working chess game example between server socket on Android and client socket on iOS.

Android chess in Kotlin: https://github.com/zhijunsheng/chess-kotlin-andr

iOS chess in Swift: https://github.com/zhijunsheng/chess-uikit-ios

There is a demo video too.