mbed ethernet interface not working - c

Question

I have a NXP FRDM-K64F board and I want to set the ethernet example but I cannot get it working. This is how my code looks like after setting the static IP address.
#include "mbed.h"
#include "main-hw.h"
#include "EthernetInterface.h"
// Network interface
EthernetInterface net;
int main(void)
{
// Bring up the ethernet interface
printf("Ethernet socket example\r\n");
int ret;
ret = net.set_network("192.168.15.177","255.255.255.0","192.168.15.1");
printf("Set Net: %d\r\n",ret);
char macadd[6];
mbed_mac_address(macadd);
printf("%02x:%02x:%02x:%02x:%02x:%02x \r\n", macadd[0], macadd[1], macadd[2], macadd[3], macadd[4], macadd[5]);
const char *mac = net.get_mac_address();
printf("MAC address is: %s\r\n", mac ? mac : "No MAC");
const char *ip = net.get_ip_address();
printf("IP address is: %s\r\n", ip ? ip : "No IP");
ret = net.connect();
printf("Connect: %d\n",ret);
// Show the network address
// const char *ip = net.get_ip_address();
// printf("IP address is: %s\n", ip ? ip : "No IP");
// Open a socket on the network interface, and create a TCP connection to mbed.org
TCPSocket socket;
socket.open(&net);
socket.connect("developer.mbed.org", 80);
// Send a simple http request
char sbuffer[] = "GET / HTTP/1.1\r\nHost: developer.mbed.org\r\n\r\n";
int scount = socket.send(sbuffer, sizeof sbuffer);
printf("sent %d [%.*s]\n", scount, strstr(sbuffer, "\r\n")-sbuffer, sbuffer);
// Recieve a simple http response and print out the response line
char rbuffer[64];
int rcount = socket.recv(rbuffer, sizeof rbuffer);
printf("recv %d [%.*s]\n", rcount, strstr(rbuffer, "\r\n")-rbuffer, rbuffer);
// Close the socket to return its memory and bring down the network interface
socket.close();
// Bring down the ethernet interface
net.disconnect();
printf("Done\n");
return 0;
}
What I see is that I only get the macAddress with the mbed_mac_address command. With net.get_mac_address and net.get_ip_address I only get NULL values.
The process get to the net.connect and I see no more results.
What am I doing wrong?

Answer 1

With mbed OS 5.3.4 this works fine for me on a K64F:
#include "mbed.h"
#include "EthernetInterface.h"
// Network interface
EthernetInterface net;
// Socket demo
int main() {
// Set static IP
net.set_network("192.168.1.99", "255.255.255.0", "192.168.1.1");
// Bring up the ethernet interface
printf("Ethernet socket example\n");
net.connect();
// Show the network address
const char *ip = net.get_ip_address();
printf("IP address is: %s\n", ip ? ip : "No IP");
printf("MAC address is: %s\n", net.get_mac_address());
// Open a socket on the network interface, and create a TCP connection to mbed.org
TCPSocket socket;
socket.open(&net);
socket.connect("developer.mbed.org", 80);
// Send a simple http request
char sbuffer[] = "GET / HTTP/1.1\r\nHost: developer.mbed.org\r\n\r\n";
int scount = socket.send(sbuffer, sizeof sbuffer);
printf("sent %d [%.*s]\n", scount, strstr(sbuffer, "\r\n")-sbuffer, sbuffer);
// Recieve a simple http response and print out the response line
char rbuffer[64];
int rcount = socket.recv(rbuffer, sizeof rbuffer);
printf("recv %d [%.*s]\n", rcount, strstr(rbuffer, "\r\n")-rbuffer, rbuffer);
// Close the socket to return its memory and bring down the network interface
socket.close();
// Bring down the ethernet interface
net.disconnect();
printf("Done\n");
}
Updating mbed OS
If you still have the mbed library (not mbed-os) in the online compiler, right click on 'mbed', and click 'Remove'. Then click on 'Add library' > 'From URL' and enter https://github.com/armmbed/mbed-os.
If you have mbed-os, right click on the library and select 'Upgrade'.
From mbed CLI:
$ mbed remove mbed
$ mbed add mbed-os
Or when you already have mbed-os:
$ cd mbed-os
$ git pull
$ git checkout latest