LuaSocket (UDP) 不接收数据报 [英] LuaSocket (UDP) not receiving datagrams

问题描述

我正在为我正在进行的一个项目试验 LuaSocket.我选择了 UDP 作为我的协议.

I'm experimenting with LuaSocket for a project I'm working on. I've chosen UDP as my protocol.

在网上寻找文档和教程，我尝试创建一个用于测试和学习的客户端-服务器对.

Looking for docs and tutorials online, I've attempted to create a client-server pair for testing and learning.

根据我所读到的内容，以下代码应该可以工作.但是，似乎只有服务器工作正常.客户端发送消息，但不会收到服务器的回复.

According to what I've read, the following code should work. However, only the server seems to be working properly. The client sends a message, but it will not receive the reply from the server.

感谢您提供任何帮助.

服务器:

-- Server
#!/usr/bin/env lua5.1

local socket = require("socket")

udp = socket.udp()
udp:setsockname("*", 53474)
udp:settimeout(0)

while true do
    data, ip, port = udp:receivefrom()
    if data then
        print("Received: ", data, ip, port)
        udp:sendto(data, ip, port)
    end
    socket.sleep(0.01)
end

客户:

-- Client
#!/usr/bin/env lua5.1

local socket = require("socket")

udp = socket.udp()
udp:setpeername("127.0.0.1", 53474)
udp:settimeout(0)

udp:send("Data!")
data = udp:receive()
if data then
    print("Received: ", data)
end

推荐答案

你设置的超时值为0，导致每次客户端超时.

The timeout value you set is 0, which causes the client timeout every time.

要修复它，给它一个正超时值:

To fix it, give it a positive timeout value:

udp:settimeout(1)

或者将其设置为 nil 或一个负值，从而无限期地阻塞:

Or set it to nil or a negative value, so it blocks indefinitely:

udp:settimeout()

或

udp:settimeout(-1)

这篇关于LuaSocket (UDP) 不接收数据报的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！