I was able to successfully awake LwIP on H747ZI and on F4 (on F4, CubeMX generated code worked), but not the one which is in CubeMX. A freshly generated project immendiately throws an ethernet DMA error on H7.
Finally I found an example in CubeMX package, located in: STM32Cube\Repository\STM32Cube_FW_H7_V1.4.0\Projects\NUCLEO-H743ZI\Applications\LwIP\LwIP_HTTP_Server_Netconn_RTOS and it works. Compiled with Atollic true studio (open SW4STM32\STM32H743ZI_Nucleo) and it will compile.
Try to use this example as starting point.
A very simple UDP echo example is here:
struct netbuf *buf;
static void udp_thread(void *arg)
{
struct netconn *conn;
err_t err;
char buffer[256];
/* Create a new TCP connection handle */
conn = netconn_new(NETCONN_UDP);
netconn_bind(conn, IP_ADDR_ANY, 1234);
while (1)
{
err = netconn_recv(conn, &buf);
if (err == ERR_OK)
{
/* no need netconn_connect here, since the netbuf contains the address */
netbuf_copy(buf, buffer, sizeof(buffer));
err = netconn_send(conn, buf);
netbuf_delete(buf);
}
}
}
sys_thread_new("UDP2TH", udp_thread, NULL, 2048, 4);
