Question
How can I send data over TCP / LwIp?
I am using Echoserver and EchoClient source code for stm32.
I used `tcp_echoserver_init();` function to start callback and I tried to connect with python client to this server. And its successfully connect. I checked with wireshark. And python program didnt give any error.
But I want to send data from server to client, but I didnt do that. I get always `Errorr 2` ( When I connect to server from client, I didnt get any data)
I initilize the server with `tcp_echoserver_init();` again and
`tcp_data_send` function calling in while loop. How can I send data over tcp correctly ?
void tcp_data_send(void)
{
err_t err;
char data1[] = { 1, 2, 3, 4};
if( tcp_echoserver_pcb != NULL && (tcp_echoserver_pcb->state == ESTABLISHED))
{
/* send data1 */
err = tcp_write(tcp_echoserver_pcb, (const void *)&data1, 4, 0);
err = tcp_output(tcp_echoserver_pcb);
SerialPrint(" established \n");
if( ( err == ERR_MEM ) )
{
SerialPrint("Errorr 1");
// close_my_conn( my_pcb );
}
}
else
{
SerialPrint("Errorr 2");
}
}