TM4C129EXL network broadcast

I found this forum post that might help you:

e2e.ti.com/.../1313216

And this discussion of the topic in stackoverflow:

stackoverflow.com/.../network-udp-broadcast-design

My understanding is that any packet sent to the 255.255.255.255 IP address (or your network's specific subnet (ie 192.168.0.255)) is considered a broadcast packet to all the devices on your subnet. If all of your nodes set up a listener socket on an agreed upon port number, and the broadcaster sends a packet to that port and that IP address, then everyone should receive everyone's broadcasts.

I hope this helps.

Alan

Hello Alan,

Thank you for your reply. As you suggested I started to implement the udp broadcast. But I have a problem

When I try to set the SO_BROADCAST I always have an error. Even with type int and char too. 

void udpBroadcast(){

	System_printf("Start udpBroadcast\n");
	System_flush();

	Task_sleep(10000);

	struct sockaddr_in their_addr;
	int socketfd;
	if(socketfd = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP) == -1){
		System_abort("failed to create socket");
		System_flush();
	}

	char optval = 1;
	int optlen = sizeof(optval);


	// Set KEEPALIVE option to 1
	optval = 1;
	if (setsockopt(socketfd, SOL_SOCKET, SO_BROADCAST, &optval, optlen) < 0)
	{
		System_printf("Error: setsockopt failed\n");
		System_flush();
	}


	if(getsockopt(socketfd, SOL_SOCKET, SO_BROADCAST, &optval, &optlen) < 0)
	{
		System_printf("Error: setsockopt failed\n");
		System_flush();
	}



	memset(&their_addr,0,sizeof(their_addr));
	their_addr.sin_family = AF_INET;
	their_addr.sin_port = htons(1200);
	their_addr.sin_addr.s_addr = htonl(0xC0A801FF);	// 192.168.1.255
	//memset(their_addr.sin_zero,'\0',sizeof(their_addr.sin_zero));

	uint8_t packet[50];
	memset(packet,0xFA,50);

	int sent = sendto(socketfd,packet,50,0,(struct sockaddr *)&their_addr,sizeof(their_addr));
	if(sent < 0){
		System_printf("unable to send broadcast");
		System_flush();
	}

	close(socketfd);

}

This link helps me a lot but I can not get over with SO_BROADCAST: 

in the doc: SPRU524J here is the description:

SO_BROADCAST: Requests permission to send broadcast datagrams on the socket. Broadcast was a privileged operation in earlier versions of the system.

Any idea? 

I modified the UDPEcho example to set the socket option but no effect.

the error code is 9: Bad file descriptor....