How to get permission to receive Internet messages by sockets in my mobile application (push)?

  

I want to create my own push server to my mobile application (made in Delphi X) for Android and iOS.

Do we get stuck in firewalls or service operator routing blocks like we do when doing peer-to-peer?

I need some model for that implementation, and I don’t want to user Google Push Service. I want to have an independent service.

Note: In my country there is a concern on creating application that spend as less transfer data as possible, because mobile internet cost is very very expensive. So I only invest in pull if someone tells me it is more economic in data data-transfer amount then pulling alternatives.

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