#include "mbed.h"
#include "EthernetInterface.h"

// Network interface
EthernetInterface net;

// Socket demo
int main() {
    // 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");

    // Open a socket on the network interface, and create a TCP connection to mbed.org
    TCPSocket socket;
    socket.open(&net);
    socket.connect("www.arm.com", 80);

    // Send a simple http request
    char sbuffer[] = "GET / HTTP/1.1\r\nHost: www.arm.com\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");
}

Hello everyone, Im working with Ethernet Interface on mbed 5 and STM32F407 Seeed Arch Max board. I have a problem with the TCP socket and server. The program return error code -3005 which is "no available socket for use" 1. I successfully created an UDP Socket and it worked perfectly. 2. I changed the target to my STM32F746 discovery code and the TCP server/socket worked also. 3. I used the original code that generated from STM32CubeMX and used LwIP stack, and the TCP server/socket worked. So I assume that there are no hardware problem, no general TCP problem, it's a problem with mbed on STM32F407. Anypne can help me with this? This is my simple example code that I used: <<code title=TCPSocket_Example>> #include "mbed.h" #include "EthernetInterface.h" // Network interface EthernetInterface net; // Socket demo int main() { // 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"); // Open a socket on the network interface, and create a TCP connection to mbed.org TCPSocket socket; socket.open(&net); socket.connect("www.arm.com", 80); // Send a simple http request char sbuffer[] = "GET / HTTP/1.1\r\nHost: www.arm.com\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"); } <</code>>