Hello,
after spending several hours trying the versions of the STMCubeIDE (1.6.1, 1.9.0, 1.13.1) with various combinations of the STM32Cube FW_H7 (V1.9.0, V1.9.1, V1.10.0, V1.11.0), I come to the conclusion that the application implementation is probably causing the problem.
/* Handle the incoming TCP Data */
static void tcp_server_handle (struct tcp_pcb *tpcb, struct tcp_server_struct *es)
{
struct tcp_server_struct *esTx;
/* allocate structure es to maintain tcp connection information */
esTx = (struct tcp_server_struct *)mem_malloc(sizeof(struct tcp_server_struct));
/* get the Remote IP */
ip4_addr_t inIP = tpcb->remote_ip;
uint16_t inPort = tpcb->remote_port;
/* Extract the IP */
char *remIP = ipaddr_ntoa(&inIP);
esTx->state = es->state;
esTx->pcb = es->pcb;
esTx->p = es->p;
char buf[100];
memset (buf, '\0', 100);
strncpy(buf, (char *)es->p->payload, es->p->tot_len);
strcat (buf, "+ Hello from TCP SERVER\n");
esTx->p->payload = (void *)buf;
esTx->p->tot_len = (es->p->tot_len - es->p->len) + strlen (buf);
esTx->p->len = strlen (buf);
tcp_server_send(tpcb, esTx);
pbuf_free(es->p);
mem_free(esTx);
}
Incorrect memory access can also be seen in the example video from ControllersTech https://youtu.be/olYTNjM2kwE?t=598. I thought it was because of the LWIP version.
I adapted the function to write to the same memory as the received data. So far this has been working without any problems.
static void tcp_server_handle (struct tcp_pcb *tpcb, struct tcp_server_struct *es)
{
char a[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
uint8_t ui8_loop;
static uint8_t ui8_switcher = 0;
uint8_t *pui8_payload;
pui8_payload = es->p->payload;
for(ui8_loop = 0; ui8_loop < (es->p->len - 1); ui8_loop++)
{
*pui8_payload = a[(ui8_loop + ui8_switcher) % ((sizeof(a)/sizeof(a[0])))];
pui8_payload++;
}
*pui8_payload = '\n';
ui8_switcher++;
tcp_server_send(tpcb, es);
}
I have attached the original tcpServerRAW.c.
Is there a simple example of a TCP/IP or UDP client-server implementation?
