Question
lwip accept fails after staying "idle" for sometime, how can I fix this?
Hello STM community,
I am developing server/client application.
Client is running on Windows 11, using winsock2.h and ws2tcpip.h library
Server is running on STM32F429ZIT6 - Nucleo
If I reset MCU, I have no issue establishing a connection, send & receive on both end.
If MCU stays in lwip_accept method for too long, client is not able to establish connection.
void StartDefaultTask(void *argument)
{
/* init code for LWIP */
MX_LWIP_Init();
/* USER CODE BEGIN 5 */
struct sockaddr_in address, client_addr;
socklen_t sin_size;
int s_create, new_socket;
int addrlen = sizeof(address);
int opt = 1;
int socket_check;
int retVal;
s_create = lwip_socket(AF_INET, SOCK_STREAM, 0);
memset(&address,0,sizeof(address));
address.sin_family = AF_INET;
address.sin_addr.s_addr = htonl(IPADDR_ANY);
address.sin_port = htons(HTTP_PORT);
socket_check = lwip_bind(s_create, (struct sockaddr*)&address, sizeof(address));
socket_check = lwip_listen(s_create, 1); //returns 0 on succes, -1 on failure
uint8_t elyes[6] = {70,114,101,110,99,104};
uint8_t data[100] = {'\0'};
char recvBuff[100];
memset(&recvBuff,0,sizeof(recvBuff));
char printMsg[100];
for(;;)
{
sin_size = sizeof(struct sockaddr_in);
new_socket = lwip_accept(s_create, (struct sockaddr *)&client_addr, &sin_size); //Blocking function, ping doesnt work
if (new_socket > 0){
uint16_t msgSize = sprintf(printMsg, "new client connected from IP: %s, Port: %d\r\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
HAL_UART_Transmit(&huart3, (uint8_t*)printMsg, msgSize, 10);
sys_thread_new("process msg",
socket_thread,
(void*)new_socket,
THREAD_STACKSIZE,
DEFAULT_THREAD_PRIO);
}
osDelay(1000);
}
/* USER CODE END 5 */
}
void socket_thread(void *ptr){
int cSocket = (int)ptr;
int retVal;
uint8_t elyes[6] = {70,114,101,110,99,104};
uint8_t data[100] = {'\0'};
char recvBuff[100];
while(1){
retVal = lwip_write(cSocket, elyes, sizeof(elyes));
if(retVal < 0) break;
retVal = lwip_read(cSocket, &recvBuff, sizeof(recvBuff)); //return number of bytes received.
if(retVal < 0) break;
}
osDelay(500);
close(cSocket);
vTaskDelete(NULL);
}I am thinking there is some conflict between FreeRTOS and lwip_accept() method but i'm not sure. I can see request packets from client with WireShark when Server fails to respond. That's why i'm pretty confident its lwip_accept() that fails.
I am using CMSIS_V2 Interface for FreeRTOS
Any Idea why ?