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UDP TCP Socket Server. Easy to use TCP and UDP Sockets in Blueprints.
You can easily use TCP and UDP connections to send and receive data in blueprints with this plugin . This is a Server. You can buy a client here. Since this is a server, it is important to open the ports in your firewall and router. Use UDP for streams, gaming (your own replication). For everything else, like matchmaking, lobby, chat, is TCP suitable. I recommend my JSON plugin for data communication. Multiple servers on multiple different ports simultaneously are not possible. You don't need C++. I only tried Linux and Windows. Therefore, only these are officially supported. But the plugin should run on any platform where the engine is running. (You have to keep in mind that IOS blocks unsafe connections. It can be somehow deactivated. I do not have an IOS device and cannot help.)
I recommend this tool for testing and developing.
4.20 in review. For the 4.19 review Epic needed 1 month. Hopefully it'll go faster this time.
Changelog (4.17, 4.18)
Changelog (4.17, 4.18, 4.19)