Tcp cinnection problem

Question

I am going trying to implement a simple tcp server. I am using the library socket.c and socket.h. i followed the tutorial infact the client succeses to connect with me. But the Sn_SR does not go in the connect_extabilished.

becky · Answer

Your text is too short. I can’t judge the problem by looking at your writing. I hope you see loopback_tcps() in loopback.c and refer to the process for extabilishing. int32_t loopback_tcps(uint8_t sn, uint8_t* buf, uint16_t port) { int32_t ret; uint16_t size = 0, sentsize=0; #ifdef _LOOPBACK_DEBUG_ uint8_t destip[4]; uint16_t destport; #endif switch(getSn_SR(sn)) { case SOCK_ESTABLISHED : if(getSn_IR(sn) & Sn_IR_CON) { #ifdef _LOOPBACK_DEBUG_ getSn_DIPR(sn, destip); destport = getSn_DPORT(sn); printf("%d:Connected - %d.%d.%d.%d : %d ",sn, destip[0], destip[1], destip[2], destip[3], destport); #endif setSn_IR(sn,Sn_IR_CON); } if((size = getSn_RX_RSR(sn)) > 0) // Don't need to check SOCKERR_BUSY because it doesn't not occur. { if(size > DATA_BUF_SIZE) size = DATA_BUF_SIZE; ret = recv(sn, buf, size); if(ret <= 0) return ret; // check SOCKERR_BUSY & SOCKERR_XXX. For showing the occurrence of SOCKERR_BUSY. size = (uint16_t) ret; sentsize = 0; while(size != sentsize) { ret = send(sn, buf+sentsize, size-sentsize); if(ret < 0) { close(sn); return ret; } sentsize += ret; // Don't care SOCKERR_BUSY, because it is zero. } } break; case SOCK_CLOSE_WAIT : #ifdef _LOOPBACK_DEBUG_ //printf("%d:CloseWait ",sn); #endif if((ret = disconnect(sn)) != SOCK_OK) return ret; #ifdef _LOOPBACK_DEBUG_ printf("%d:Socket Closed ", sn); #endif break; case SOCK_INIT : #ifdef _LOOPBACK_DEBUG_ printf("%d:Listen, TCP server loopback, port [%d] ", sn, port); #endif if( (ret = listen(sn)) != SOCK_OK) return ret; break; case SOCK_CLOSED: #ifdef _LOOPBACK_DEBUG_ //printf("%d:TCP server loopback start ",sn); #endif if((ret = socket(sn, Sn_MR_TCP, port, 0x00)) != sn) return ret; #ifdef _LOOPBACK_DEBUG_ //printf("%d:Socket opened ",sn); #endif break; default: break; } return 1; }

gakgoelazig · Answer

when debug, everything is good and working. but If I shut down the computer then I cannot connect to the processor again. When you enter the ethernet settings from the control panel and turn the ethernet off and on, it works normally again. how to solve this error. can you help me. my mcu is working tcp server mode. ı am using tcp comunication. ı am using stm32f407vg .w5500 module . my code /* Open socket 0 as TCP_SOCKET with port 5000 / if((retVal = socket(0, Sn_MR_TCP, 80, SF_TCP_NODELAY)) == 0) { / Put socket in LISTEN mode. This means we are creating a TCP server / if((retVal = listen(0)) == SOCK_OK) { / While socket is in LISTEN mode we wait for a remote connection */ while(sockStatus = getSn_SR(0) == SOCK_LISTEN) delay(600); / OK. Got a remote peer. Let’s send a message to it / while (1) { / If connection is ESTABLISHED with remote peer / if (sockStatus = getSn_SR(0) == SOCK_ESTABLISHED) { / Retrieving remote peer IP and port number / getsockopt(0, SO_DESTIP, remoteIP); getsockopt(0, SO_DESTPORT, ( uint8_t *)&remotePort); sprintf(msg, CONN_ESTABLISHED_MSG, remoteIP[0], remoteIP[1], remoteIP[2], remoteIP[3], remotePort); PRINT_STR(msg); while (received_len==0) { if ((RSR_len = getSn_RX_RSR(0) )> 0) { received_len = recv(0, data_buf, RSR_len); if (data_buf[0] == 1) { HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_15); sprintf(msg,“adc degeri %d”,adc_ntc[0]); send(0, msg, strlen(msg)); } else { sprintf(msg,“adc degeri %d”,adc_ntc[0]); send(0, msg, strlen(msg)); HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_14); } } } received_len =0; / Let’s send a welcome message and closing socket / if (retVal = send(0, GREETING_MSG, strlen(GREETING_MSG)) == ( int16_t )strlen(GREETING_MSG)) PRINT_STR(SENT_MESSAGE_MSG); else { / Ops: something went wrong during data transfer / sprintf(msg, WRONG_RETVAL_MSG, retVal); PRINT_STR(msg); } break ; } else { / Something went wrong with remote peer, maybe the connection was closed unexpectedly / sprintf(msg, WRONG_STATUS_MSG, sockStatus); PRINT_STR(msg)…