[lwip-users] LWIP Client code help

[shettys]

Hello I have been stuck with some LWIP client code i was working on , using
RAW api. Was hoping someone could help me since i dont seem to be
understanding the reason.

I connect as a client to the server using the code mentioned below. Which it
does. And sends a message the first time. 

I want to keep this connection and send messages without having to
disconnect. Could someone please tell me why i have to close the connection
and open it again every time to send a message?

err_t connect(void) 
{ 
 u8_t *state; 
 err_t err; 
 struct tcp_pcb *pcb; 
 struct ip_addr ipaddr; 
 IP4_ADDR(&ipaddr, 192,168,5,2); 
if ((state = mem_malloc(1)) == NULL) 
  return ERR_MEM; 
 *state = 1; 
   
if ((pcb = tcp_new()) == NULL) 
 { 
  mem_free(state); 
  return ERR_MEM; 
 } 
 tcp_arg(pcb, state); 
 tcp_err(pcb, hello_err); 
 tcp_recv(pcb, hello_recv); 
 tcp_sent(pcb, NULL); 
  tcp_poll(pcb, hello_poll_close, 10); 

err = tcp_connect(pcb, &ipaddr, 7, connected); 
 if (err != ERR_OK) 
 { 
  mem_free(state); 
  tcp_abort(pcb); 
 } 
 return err; 
}

err_t connected(void *arg, struct tcp_pcb *pcb, err_t err) 
{ 
 tcp_write(pcb, "my message", 12, 0); 
 return ERR_OK; 
} 
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