Sorry, gentle reader, this one’s a bit technical.

I was reusing some of the code Apple supply for sending UDP packets between servers, but the system I’m working with listens for broadcast packets. I set it up to use the address, but got the EACCESS error: Permission denied

I found an example that did work (without using Apple’s CFSocket class) and did a line by line what’s different. You need this to do broadcast

int broadcastEnable=1;

int ret=setsockopt(sd, SOL_SOCKET, SO_BROADCAST, &broadcastEnable, sizeof(broadcastEnable));

if (ret) {
    NSLog(@”Error: Could not open set socket to broadcast mode”);
If you edit this into Apple’s UDP echo project then it will allow broadcast. Give thanks and praise at