[ilco13]

Oh oops, I totally forget to do that. I’ve put it in my while(1) loop with a small delay before and it’s working now.

I read the commentary about what it does and realize my mistake.

However, no, with MX_LWIP_Process() running at each loop, I wonder how I can open a tcp socket and send data ? Can I integrate part of the tcp socket creation inside MX_LWIP_Process() function ?

while (1) { /* USER CODE END WHILE */ Delay(2000000); MX_LWIP_Process(); pcb = tcp_new(); ret_val = tcp_connect(pcb, &dest, 1883, callback_Connected); if (ret_val != ERR_OK) printf("\tcp_connect(): Errors on return value, returned value is %d\n", ret_val); /* USER CODE BEGIN 3 */ } err_t callback_Connected(void *arg, struct tcp_pcb *pcb, err_t err) { err = tcp_write(pcb,buf,len,1); tcp_output(pcb); //to make it send the data immediately tcp_close(pcb); return err; }

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while (1)   {   /* USER CODE END WHILE */   Delay(2000000);     MX_LWIP_Process();             pcb = tcp_new();             ret_val = tcp_connect(pcb, &dest, 1883, callback_Connected);    if (ret_val != ERR_OK)    printf("\tcp_connect(): Errors on return value, returned value is %d\n", ret_val);     /* USER CODE BEGIN 3 */     }   err_t callback_Connected(void *arg, struct tcp_pcb *pcb, err_t err)   {       err = tcp_write(pcb,buf,len,1);       tcp_output(pcb);           //to make it send the data immediately       tcp_close(pcb);       return err;   }

thank you for you (fast) help.

• This reply was modified 7 years, 9 months ago by ilco13.

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