Hello Uwe,
I have the call back for accept set as follows.
In the main application, I call echo_accept.
server_tpcb = tcp_new();
ui32Err = tcp_bind(server_tpcb, (ip_addr_t
*)&g_ui32IPAddress, NODE_TCP_SERVER_PORT);
UARTprintf("\n%d",ui32Err);
server_tpcb = tcp_listen(server_tpcb);
tcp_accept(server_tpcb, echo_accept);
which is as follows.
static err_t echo_accept(void *arg, struct tcp_pcb *pcb, err_t err)
{
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(err);
tcp_setprio(pcb, TCP_PRIO_MIN);
tcp_arg(pcb, NULL);
tcp_recv(pcb, echo_recv);
tcp_err(pcb, echo_err);
tcp_poll(pcb, NULL, 0);
return ERR_OK;
}
Do you mean that instead of using pcb I should have another tcp_pcb e,g,
newpcb that is assigned from the pcb in the call back.
struct tcp_pcb *newpcb;
static err_t echo_accept(void *arg, struct tcp_pcb *pcb, err_t err)
{
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(err);
newpcb = pcb;
tcp_setprio(pcb, TCP_PRIO_MIN);
tcp_arg(pcb, NULL);
tcp_recv(pcb, echo_recv);
tcp_err(pcb, echo_err);
tcp_poll(pcb, NULL, 0);
return ERR_OK;
}
Regards
Amit
On Thu, Nov 5, 2015 at 11:28 AM, Valery Ushakov <u...@stderr.spb.ru> wrote:
> Amit Ashara <ashara.a...@gmail.com> wrote:
>
> > When a connection is established between the server and the client,
> > I can use the tcp_write on the client side to send data in my
> > application code. However the same on the server side is not
> > possible. The pcb that has been used for the server only contains
> > the server's address and server's port but not the client's address
> > and client's port. In the receive call back on the server side, I
> > can send the data to the client but not outside of the call back.
>
> You are using wrong pcb. On the server you start with a listening
> pcb. When your accept callback is called, it's passed a *new* pcb,
> that represents the established connection. You should use that pcb
> for tcp_write. Writing from receive callback works because in the
> receive callback the pcb argument is that connection pcb, not the
> original listening pcb.
>
> -uwe
>
>
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