[lwip-users] UDP server - how to send response to client's port

[gregoryhouse]

Hi,

I'm writing a simple UDP server. The server is receiving on port 8001

conn = netconn_new( NETCONN_UDP );
netconn_bind( conn, NULL, 8001 );
if ( buf = netconn_recv( conn ) )
{
    netbuf_data( buf, (void *)&data, (void *)&len );
    // Processing data
    // Send reply message to the client!!!
}

How can I send reply message to the client?
I must to do the following transaction:

Request:
client_ip : client_port -> server_ip : 8001
Response:
server_ip : 8001 -> 255.255.255.255 : client_port

How can I obtain the client's port? I wrote the following code

    netconn_connect( conn, &ip, PORT ); // PORT - fixed port number
previously defined
    buf = netbuf_new();
    netbuf_ref(buf, helloResponse, 46);
    netconn_send(conn, buf);
    netconn_disconnect(conn);

and it is working (i see packets in Wireshark), but only with fixed port
number. I was trying to use netconn_peer() function and
conn->pcb.udp->remote_port field with no effects.

Thanks for any advises,
Regards,
Gregory

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