How to achieve UDP packets encapsulated in iOS, then sent to the destination host

As the title, how these develop in Xcode, novice help
Reply:
socket programming
Reply:

cited a floor reply:

socket programming

You have ios this item?
Reply:
You can
the socket directly with c
ios relevant is called CFSocket, you can be found in the official document
Reply:
Direct download asyncsocket, mac and ios following very useful open source libraries. tcp and udp have, just a little foundation to understand how one can use. Inside with examples