Question
Simple TCP Communication
I am trying to use basic TCP-IP communication with two different stm32 devices, one of them TCP client one of them TCP server. On the wireshark picture; Up to the arrow mark both client and server connection successfully data send and receive, after the arrow I reset the client than ReTransmition message shows. I am using stm32 lwip Raw, And simple CubeIde tcp-echo server client example.
Client initilized with
tcp_echoclient_connect
and Server initilize with:
tcp_echoserver_init
https://i.stack.imgur.com/eBfsp.png
/**
* @brief Initializes the tcp echo server
* @param None
* @retval None
*/
void tcp_echoserver_init(void)
{
/* create new tcp pcb */
tcp_echoserver_pcb = tcp_new();
if (tcp_echoserver_pcb != NULL)
{
err_t err;
/* bind echo_pcb to port 7 (ECHO protocol) */
err = tcp_bind(tcp_echoserver_pcb, IP_ADDR_ANY, 7);
if (err == ERR_OK)
{
/* start tcp listening for echo_pcb */
tcp_echoserver_pcb = tcp_listen(tcp_echoserver_pcb);
/* initialize LwIP tcp_accept callback function */
tcp_accept(tcp_echoserver_pcb, tcp_echoserver_accept);
}
else
{
/* deallocate the pcb */
memp_free(MEMP_TCP_PCB, tcp_echoserver_pcb);
}
}
}/**
* @brief Connects to the TCP echo server
* @param None
* @retval None
*/
void tcp_echoclient_connect(void)
{
ip_addr_t DestIPaddr;
/* create new tcp pcb */
echoclient_pcb = tcp_new();
if (echoclient_pcb != NULL)
{
IP4_ADDR(&DestIPaddr, (uint8_t)192, (uint8_t)168, (uint8_t)1, (uint8_t)40);
/* connect to destination address/port */
tcp_connect(echoclient_pcb,&DestIPaddr,7,tcp_echoclient_connected);
}
else
{
SerialPrint("not null");
memp_free(MEMP_TCP_PCB, echoclient_pcb);
}
}What is my problem how can I solve this ?