Example code for non blocking TCP Socket

Hi Clement,

Thanks for your question. Take a look at these projects: OTA, p2p, TCP, and webserver since these use non blocking.

Best,

Austin

Hi Austin,

Thanks for your reply.
I take a look at those projects, but I do not see anything related to "non blocking TCP socket".
Can you show me what part of the code I have to focus on ?

thank you in adavance

Clement

Hi,

Try this:

int send(int socket, const void *buf, int len) {
  int timeout = 1000;
  int retVal;
  while (1) {
    retVal = sl_Send(socket, buf, len, 0);
    if (retVal != SL_EAGAIN) break;
    osi_Sleep(1);
    if ((timeout--) <= 0) return -1;
  }
  if (retVal < 0) return -2;
  return 0;
}

Jan

Hi Jan,

Thank for you reply.

I tried your code snippet. The return is always -2.

I do not use any RTOS in my project, I had to replace osi_Sleep by :

_SlNonOsMainLoopTask();
for (i=0 ; i<4500 ; i++);
_SlNonOsMainLoopTask();

Hi,

Hmm... I expect that something else you have wrong. Is always retVal -1 as you wrote at your first post? How long is your delay for()? I expect very short. Maybe even this delay for() not working properly, due to compiler optimizations.


Jan

You sl_Send always return -1 when I call it alone. From your funtion it is -2.

My delay is approximately 1ms. You are right, compiler may interfere.

I first try to disable optimization on compiler : same result.

Then I replaced my "for" by (optimization still disabled) :

uint16_t tab[10];
int j = 0;
for (i=0 ; i<4500 ; i++)
{
	tab[++j] = tab[j] + 1;
	if (j == 9)
	j = 0;
}

The result is again -2.

Hi,

I think something else is wrong in your code. Unfortunately I am not able determine issue. Do you have latest SDK with latest service pack?


Jan

Hi,

Yes I have the lastest SDK and the CC3100 up to date.