Re: [lwip-users] Raw lwIP server write issue

[Valery Ushakov]

Amit Ashara <address@hidden> 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