Receive data from TCP (FreeRTOS, LWIP) - tcp

Question

When I start this program (see below), all is working fine. But when I disable return data back to TPCIP, program working bad.
Here is program, working fine: [1]: http://s27.postimg.org/seixg63hf/problem_2.jpg
static err_t prijata_data(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
{
void *data;
if (err == ERR_OK && p != NULL) {
// information of receive data
tcp_recved(pcb, p->tot_len);
//free buffer
pbuf_free(p);
data = p->payload; //copy value to send out of queue
xQueueSend(queue_ethernet, &data, 10); //send value to queue
//send data out
err = tcp_write(pcb, p->payload, p->len, TCP_WRITE_FLAG_COPY);
tcp_sent(pcb, NULL); // No need to call back
}
else
{
pbuf_free(p);
}
if (err == ERR_OK && p == NULL) {
close_conn(pcb);
}
return ERR_OK;
}
And this function going here:
s
static err_t prijimani_dat(void *arg, struct tcp_pcb *pcb, err_t err){
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(err);
tcp_setprio(pcb, TCP_PRIO_MIN);
tcp_recv(pcb, prijata_data);
tcp_err(pcb, server_err);
tcp_poll(pcb, server_poll, 4);
return ERR_OK;
}
Complet communication is implement in task FreeRTOS:
extern void TCP_connection(void *pvParameters)
{
UNUSED(pvParameters);
const portTickType xDelayTime = 5 / portTICK_RATE_MS;
struct tcp_pcb *tcp_server;
tcp_server = tcp_new();
tcp_bind(tcp_server, IP_ADDR_ANY, TCP_PORT);
while (1){
tcp_server = tcp_listen(tcp_server);
tcp_accept(tcp_server, prijimani_dat);
vTaskDelay(xDelayTime);
}
}
But when I can only reading from TCP, and I do not want back data to TCPIP, program working bad.: [2]: http://s21.postimg.org/wlhqh31g5/problem_1.jpg
static err_t prijata_data(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err){
void *data;
if (err == ERR_OK && p != NULL) {
/* information of receive data */
tcp_recved(pcb, p->tot_len);
//free buffer
pbuf_free(p);
data = p->payload; /*copy value to send out of queue*/
xQueueSend(queue_ethernet, &data, 10); //send value to queue
}
else
{
pbuf_free(p);
}
if (err == ERR_OK && p == NULL) {
close_conn(pcb);
}
return ERR_OK;
}

Answer 1

There is a very old example of how to use FreeRTOS with lwIP in the FreeRTOS Interactive site. Although a lot of the code included in this example has now been superseded the integration with lwIP should still be valid and make a reference for you.
If you are using one of the processors listed on the FreeRTOS+TCP examples page (FreeRTOS+TCP being FreeRTOS's own TCP/IP stack) then that may provide a further reference.

Answer 2

I´m trying all.
There is any mistake, but what? When I try ping, all is done correctly.
C:\>ping 192.168.0.145 -n 10
Pinging 192.168.0.145 with 32 bytes of data:
Reply from 192.168.0.145: bytes=32 time=2ms TTL=255
Reply from 192.168.0.145: bytes=32 time=4ms TTL=255
Reply from 192.168.0.145: bytes=32 time<1ms TTL=255
Reply from 192.168.0.145: bytes=32 time=1ms TTL=255
Reply from 192.168.0.145: bytes=32 time<1ms TTL=255
Reply from 192.168.0.145: bytes=32 time<1ms TTL=255
Reply from 192.168.0.145: bytes=32 time<1ms TTL=255
Reply from 192.168.0.145: bytes=32 time=1ms TTL=255
Reply from 192.168.0.145: bytes=32 time<1ms TTL=255
Reply from 192.168.0.145: bytes=32 time<1ms TTL=255
Ping statistics for 192.168.0.145:
Packets: Sent = 10, Received = 10, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 4ms, Average = 0ms

Answer 3

Ok. I am stupid. The mistake was here:
I created freeRTOS task, where I call two functions in loop every 5 milliseconds.
THIS IS WRONG:
extern void TCP_connection(void *pvParameters)
{
UNUSED(pvParameters);
const portTickType xDelayTime = 5 / portTICK_RATE_MS;
struct tcp_pcb *tcp_server;
tcp_server = tcp_new();
if (tcp_bind(tcp_server, IP_ADDR_ANY, TCP_PORT) != ERR_OK)
return;
while (1){
tcp_server = tcp_listen(tcp_server);
tcp_accept(tcp_server, server_accept);
vTaskDelay(xDelayTime);
}
}
THIS IS GOOD
extern void TCP_connection(void *pvParameters)
{
UNUSED(pvParameters);
const portTickType xDelayTime = 5 / portTICK_RATE_MS;
struct tcp_pcb *tcp_server;
tcp_server = tcp_new();
if (tcp_bind(tcp_server, IP_ADDR_ANY, TCP_PORT) != ERR_OK)
return;
tcp_server = tcp_listen(tcp_server);
tcp_accept(tcp_server, server_accept);
while (1){
vTaskDelay(xDelayTime);
}
}