Ethernet adapter not working in long run

Official Hardware Portenta Family Portenta C33
1

Hey all.
I implemented a http server on C33.
But in a stress test the board doesn't do well.
I take the smallest sample.

#include <EthernetC33.h>

EthernetServer server(7);

void setup() {
  Serial.begin(9600);

  if (Ethernet.begin() == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
  }
  server.begin();
  Serial.print("server is at ");
  Serial.println(Ethernet.localIP());
}


void loop() {
  EthernetClient client = server.available();
  if (client) {
    char previous_c = 0;
    int sequential_newline = 0;
    char buffer[1024];
    int pos = 0;

    while (client.connected()) {
      if (client.available()) {
        char c = client.read();

        if (previous_c == '\r' && c == '\n')
          sequential_newline++;
        else if (previous_c != '\n' || c != '\r')
          sequential_newline = 0;

        if (sequential_newline == 2)
          break;

        previous_c = c;
        buffer[pos++] = c;
      }
    }
    
    client.write(buffer, pos );

    delay(1);
    // close the connection:
    client.stop();
  }
}

and the python code to call

import socket

server_address = ('192.168.0.103', 7)  # Replace with the desired server address and port

while True:
    tcp_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    tcp_socket.connect(server_address)

    data = b"POST /mode/IDLE HTTP/1.1\r\nHost: 192.168.0.103\r\nUser-Agent: python-requests/2.28.1\r\nAccept-Encoding: gzip, deflate, br\r\nAccept: */*\r\nConnection: keep-alive\r\nContent-Length: 0\r\n\r\n"
    tcp_socket.sendall(data)

    while True:
        response = tcp_socket.recv(1024)

        if not response:
            break

        print(response.decode(), end='')

    tcp_socket.close()

I take a deep look on the source code too. It looks that a problem in lwip function
tcp_output that doesn't clean the recv buffer in some way.
And it's looks that is something low level because the C33 stops to respond to ping too.

Any help?

2

I forgot to add, in lwip functions is called tcp_write to add the buffer and tcp_output to send the buffer, but tcp_write keep returning ERR_MEM.

3

Also, there is no SDCard on the shield.

4

I am having the same trouble. Where is the source code for "tcp_output()"? I would like to fix it, but I can NOT find it. Looks like it is buried in "liblwip.a"...

5

You're right. It is buried in liblwip.a.
Has solution, I connected a w5500 lite and worked with it.

6

I am working with the Renesas Portenta C33 platform, any idea how to get the source code for the file that has that (broken) tcp_output() function? I would like to be able to use both wired and wireless networking -- neither are working. So is it true that there's is no "open source" code for the Renesas "liblwip" library?

7

OK, Eduardo, I modified the C33 libraries and got the wireless working now, but the Ethernet still has problems. I would like to implement your "w5500 lite" solution. Which module/board (make and part-number) did you get working?