Client TCP LwIP + stm32f107

[sebus_1985]

Hello. Sorry for my english.I don't have any experience in programming TCP, and I have a problem with LwIP. I want to make a tcp client on the stm32f107 (butterfly board from kamami.pl) which will connect to server on my computer. I found a python server code which is the best for me. Is there someone who knows how to start a client. I know how the tcp protoclol works but i don't know how this library works and what function should I use. There is some code which i made but it doesn't work. I used a stm32 demo library.

struct ip_addr server_ip;
struct ip_addr client_ip;
...
void HelloWorld_init(void)
{
    IP4_ADDR(&server_ip,192,168,0,6);
    IP4_ADDR(&client_ip,192,168,0,33);
  struct tcp_pcb *pcb;	            		
  
  /* Create a new TCP control block  */
  pcb = tcp_new();	                		 	

  /* Assign to the new pcb a local IP address and a port number */
  /* Using IP_ADDR_ANY allow the pcb to be used by any local interface */
  tcp_bind(pcb, &client_ip, 80);     

  //tcp_connect(pcb, &server_ip, 80, tcp_client_connected_l); 
  //int i;
  //for(i=0;i<2000;i++);
  
  //tcp_write(pcb, HELLO, strlen(HELLO), 1);


  /* Set the connection to the LISTEN state */
  //pcb = tcp_listen(pcb);				

  /* Specify the function to be called when a connection is established */	
  tcp_accept(pcb, HelloWorld_accept); 
  tcp_connect(pcb, &server_ip, 80, tcp_client_connected_l);   
  tcp_write(pcb, HELLO, strlen(HELLO), 1);
										
}

 

[unaided]

Hi, I think you should see api document on LWIP.
You can see:
https://www.sics.se/~adam/lwip/doc/lwip.pdf

 

[sebus_1985]

I have read this document, and I try to do the same way as they say. No effect. I instaled sniffer, some frames are sended (i am guesing it is a SYN) and then I am trying to send something but the tcp_write() sending nothing.

 

[sebus_1985]

Ok I found a solution. In lwipopt.h I disable the DHCP mode and now works fine.

 

[techfreak111]

Hi,
can you post the whole code for implementing the TCP Client using RAW API. I am trying to achieve the same but some how I am not able to connect my Client to the Server.
Thanks,
Techie