W5500 TCP client get stuck after frequently receiving data from server

Question

Hi, I am working on W5500. In which, I am running TCP client example code given on wiznet website. When I am sending data from a server with a 1000-millisecond delay. It is working fine. But when I am sending at a 200-millisecond delay then the code is stuck and in the switch case, it always comes “case SOCK_CLOSED:”. Below is the code which I have used. int32_t loopback_tcpc(uint8_t sn, uint8_t* buf, uint8_t* destip, uint16_t destport) { int32_t ret; // return value for SOCK_ERRORs uint16_t size = 0, sentsize=0; // Destination (TCP Server) IP info (will be connected) // >> loopback_tcpc() function parameter // >> Ex) // uint8_t destip[4] = {192, 168, 0, 214}; // uint16_t destport = 5000; // Port number for TCP client (will be increased) static uint16_t any_port = 50000; // Socket Status Transitions // Check the W5500 Socket n status register (Sn_SR, The 'Sn_SR' controlled by Sn_CR command or Packet send/recv status) switch(getSn_SR(sn)) { case SOCK_ESTABLISHED : if(getSn_IR(sn) & Sn_IR_CON) // Socket n interrupt register mask; TCP CON interrupt = connection with peer is successful { #ifdef LOOPBACK_DEBUG printf(“%d:Connected to - %d.%d.%d.%d : %d ”,sn, destip[0], destip[1], destip[2], destip[3], destport); #endif setSn_IR(sn, Sn_IR_CON); // this interrupt should be write the bit cleared to ‘1’ } ////////////////////////////////////////////////////////////////////////////////////////////// // Data Transaction Parts; Handle the [data receive and send] process ////////////////////////////////////////////////////////////////////////////////////////////// if((size = getSn_RX_RSR(sn)) > 0) // Sn_RX_RSR: Socket n Received Size Register, Receiving data length { if(size > DATA_BUF_SIZE) size = DATA_BUF_SIZE; // DATA_BUF_SIZE means user defined buffer size (array) ret = recv(sn, buf, size); // Data Receive process (H/W Rx socket buffer -> User's buffer) if(ret <= 0) return ret; // If the received data length <= 0, receive failed and process end size = (uint16_t) ret; sentsize = 0; // Data sentsize control while(size != sentsize) { // only receiving and sending to UART HAL_UART_Transmit(&huart3, "A", 1, 100); size=0; } } ////////////////////////////////////////////////////////////////////////////////////////////// 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:Try to connect to the %d.%d.%d.%d : %d ”, sn, destip[0], destip[1], destip[2], destip[3], destport); #endif if( (ret = connect(sn, destip, destport)) != SOCK_OK) return ret; // Try to TCP connect to the TCP server (destination) break; case SOCK_CLOSED: close(sn); if((ret=socket(sn, Sn_MR_TCP, any_port++, 0x00)) != sn){ if(any_port == 0xffff) any_port = 50000; return ret; // TCP socket open with 'any_port' port number } #ifdef LOOPBACK_DEBUG //printf(“%d:TCP client loopback…

Mxyxixptlick · Answer

I forked this W5500 library from an existing one for Arduino and made substantial improvements to it. I’ve had it running on the internet for over 2 years as both a client and a server. You may want to give it a try. Examples are included. GitHub - SapientHetero/Ethernet: Ethernet Library for Arduino