func main[] : i64
    ~s, ok := net.create_udp_server(net.pack_addr(127, 0, 0, 1), 8000)
    if !ok
        panic("net.create_udp_server failed")

    io.println("Listening on port 8000...")
    while true
        pkt := net.udp_receive(s, 60000)
        if pkt->size <= 0
            net.UDPPacket.free(pkt)
            continue

        io.printf("%d.%d.%d.%d:%d\n", pkt->source_addr[4], pkt->source_addr[5], pkt->source_addr[6], pkt->source_addr[7], mem.read16be(pkt->source_addr + 2))

        io.print_sized(pkt->data, pkt->size)
        io.println("")

        net.udp_send_to(s, pkt->source_addr, pkt->data, pkt->size)
        net.UDPPacket.free(pkt)