C function for sending ASCII text as UDP packet

Posted on 2009-04-10
Last Modified: 2012-05-06
I'm trying to write a C function that accepts an ASCII string as it's input parameter and broadcasts that text over the network as a UDP packet.

I have no idea where to start with this.

Here's a brief example of what i mean...
int main( int argc, const char* argv[] )




void SendTextViaUdpBroadcast ( TextIn )


	// Here the contents of TextIn are send as ascii in a udp packet as a broadcast (to ip


Open in new window

Question by:davepusey
  • 2
  • 2

Expert Comment

ID: 24116882
You want to set the EnableBroadcast property on the UdpClient instance
set to true. Once you do that, you want to send your request to the IP
address of From the documentation for the EnableBroadcast
property on the UdpClient class:
Broadcasting is limited to a specific subnet. You can broadcast to your
local subnet by sending a packet to; or, you can use the
directed broadcast address, which is the network portion of an Internet
Protocol (IP) address with all bits set in the host portion. For example, if
your IP address is (a Class C address, with the network portion
as the first three octets, and the host portion is the last octet), your
directed broadcast address is

Expert Comment

ID: 24116911
This manual will be a great help for you!!

Author Comment

ID: 24116970
Maybe i should clarify... This is C on linux (debian/ubuntu).

How do i open the socket in the first place?

How do i send the packet?

How do i close the socket afterwards?

Accepted Solution

ewest02 earned 500 total points
ID: 24124642

   fd = socket()      // create a socket
   sendto( fd, ...)            // send datagram to listening socket
   recvfrom( fd, ...)        // get response from server
   close( fd)           // close the socket

An excellent text for the fine details is  Stevens, Unix Network Programming
A quick overview can be had with

Author Comment

ID: 24132995
I'd already figured it out by the time you'd posted, but i'll give you the points anyway seeing as it's what i came up with.

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Webmin Bandwidth Monitoring not working 10 106
Help with a backup script in Linux 4 75
valid enum? 6 73
Issue to mail 11 72
Have you ever been frustrated by having to click seven times in order to retrieve a small bit of information from the web, always the same seven clicks, scrolling down and down until you reach your target? When you know the benefits of the command l…
The purpose of this article is to demonstrate how we can upgrade Python from version 2.7.6 to Python 2.7.10 on the Linux Mint operating system. I am using an Oracle Virtual Box where I have installed Linux Mint operating system version 17.2. Once yo…
The goal of this video is to provide viewers with basic examples to understand opening and writing to files in the C programming language.
The goal of this video is to provide viewers with basic examples to understand and use switch statements in the C programming language.

910 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

23 Experts available now in Live!

Get 1:1 Help Now