检查是否在C中发送UDP消息
我想检查为什么程序未接收UDP消息。客户程序每次示例都会发送4个整数。我有一个使用“ recvFrom（）”在端口上获取UDP消息的服务器程序，但是该程序似乎没有接收端口号上的消息，并且粘贴在“ recvFrom”函数中。我想知道我是否可以使用调试技术来调试此问题？
谢谢！
I want to check why a program is not receiving UDP messages. A client program is sending 4 integers every time sample. I have a server program that is using "recvfrom()" to get the UDP messages on a port but the program does not seem to be receiving the messages on the port number and is stuck in the "recvfrom" function. I was wondering if there are debugging techniques I can use to debug this issue?
Thanks!
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有很多可能性，常见的情况可能是
路由，确保ping有效
您的代码错误，请确保循环back地址有效
调试，您可以安装Wireshark来检查特定接口的流量。
There are many possibilities, common case could be,
Firewall on your machine or in transit, for example, your another endpoint is behind a firewall that disallow UDP inbound traffic from this address.
Routing, make sure the ping works
Your code bug, make sure loopback address works
To debug, you could install Wireshark to inspect specific interface's traffic.