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I am looking for a Delphi/FireMonkey solution to communicate peer-to-peer (e.g. chat or file transfer) like App Tethering but over a mobile network like 4G. The IP and MAC addresses of all available devices are known by all (e.g. listed on an internet server).

Nobby
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    Mobile networks don't usually allow incoming connections to devices, only outgoing connections from devices, so direct peer-to-peer is difficult to do over mobile. You might have to resort to using a centralized server to act as a proxy between devices that are connected to it. – Remy Lebeau Feb 07 '18 at 18:13
  • what is Skype doing? P2P communication via firewall tunneling (Hole Punching) – Nobby Feb 08 '18 at 12:13
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    I've had success using so-called Datasnap heavy weight callbacks on mobile. Give it a try. – Freddie Bell Feb 18 '18 at 15:07

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