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How to write a socket client to connect my own server?

I’m learning UE4 from beginning. I want to write some network code ( use tcp protocol ), to connect to my old game server, and use my own protocol.
Where can I find come documents about it?

Hi,

this one should get you started:

https://wiki.unrealengine.com/TCP_Socket_Listener,Receive_Binary_Data_From_an_IP/Port_Into_UE4,(Full_Code_Sample)