Udp Receive with nucleo_f767zi

Mbed OS
1

I am using the new Network Stack with Mbed OS 5.1. I have changed the target.json file and the STF7 Hal file for the f767zi to allow ipv4.

It looks like broadcast is not yet supported because when I change the socket options I get a NSAPI_ERROR_UNSUPPORTED error.

So I tried to set up a p2p communication, I can send a string to a python program. When I try to send it back to the f767zi, it just block indefinitely. I have wiresharked the communication and I can see the data come into the PC and go back out so I am unsure what is going wrong.

I will test with TCP just to see if the behavior is the same.

Regards, Seth

PS when will broadcast be available? 5.2 is there a roadmap for future features?

2

TCP send and receive both work.

3

Here is the code that I got it work:

#include "mbed.h"
#include "lwip-interface/EthernetInterface.h"

#include <string>
DigitalOut led1(LED1);


using std::string;
const int BROADCAST_PORT_T = 58080;
const int BROADCAST_PORT_R = 58081;
EthernetInterface eth;

void transmit()
{
    UDPSocket socket(&eth);
    string out_buffer = "very important data";
    SocketAddress transmit("192.168.1.159", BROADCAST_PORT_T);

    while (true)
    {
	int ret = socket.sendto(transmit, out_buffer.c_str(), out_buffer.size());
	printf("sendto return: %d\n", ret);

	Thread::wait(5000);
    }
}

void receive()
{
    SocketAddress receive;
    UDPSocket socket(&eth);
    int bind = socket.bind(BROADCAST_PORT_R);
    printf("bind return: %d\n", bind);

    char buffer[256];
    while (true)
    {
	printf("\nWait for packet...\n");
	int n = socket.recvfrom(&receive, buffer, sizeof(buffer));
	buffer[n] = '\0';
	printf("Packet from \"%s\": %s\n", receive.get_ip_address(), buffer);

	Thread::wait(500);
    }
}

int main()
{
    Thread transmitter;
    Thread receiver;
    eth.connect();

    printf("Controller IP Address is %s\r\n", eth.get_ip_address());
    Thread::wait(5000);

    transmitter.start(transmit);
    receiver.start(receive);

    while (true)
    {
	led1 = !led1;
	Thread::wait(500);
    }
}