TCP UDP auxiliary point to point transmission

How to combine the use tcp and udp

If you know the ip and port of the server, you can use tcp and servers directly connected. If in a local area network which, do not know the ip address of the server, the server only knows udp port, how to achieve tcp connections in case there is a world?
1. UDP search ip and port

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Origin blog.csdn.net/weixin_34050427/article/details/91390638
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