create a udp server in swift

main.swift
import Foundation

// create socket
var socketFileDescriptor: Int32 = -1
socketFileDescriptor = socket(AF_INET, SOCK_DGRAM, 0)

if socketFileDescriptor == -1 {
    print("Error: Could not create socket.")
    exit(0)
}

// set up address and port
var address = sockaddr_in()
address.sin_len = UInt8(MemoryLayout<sockaddr_in>.size)
address.sin_family = sa_family_t(AF_INET)
address.sin_port = in_port_t(12345)
address.sin_addr.s_addr = INADDR_ANY

// bind socket
let bindResult = withUnsafePointer(to: &address) {
    bind(socketFileDescriptor, UnsafePointer<sockaddr>(OpaquePointer($0)), socklen_t(MemoryLayout<sockaddr_in>.size))
}
if bindResult == -1 {
    print("Error: Could not bind socket.")
    exit(0)
}

// receive data
let bufferSize = 1024
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
while true {
    let result = recvfrom(socketFileDescriptor, buffer, bufferSize, 0, nil, nil)

    if result > 0 {
        let data = Data(bytes: buffer, count: result)
        let message = String(data: data, encoding: .utf8)
        print("Received message: \(message ?? "")")
    }
}

// close socket
close(socketFileDescriptor)
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