Re: [lwip-users] Issue with netconn_close closing connection before netconn_write's have completed

[Terry Barnaby]

On 21/05/2019 13:55, ricardoschoof wrote:
> Dear Terry,
>
> This morning I started a similar thread:
> http://lwip.100.n7.nabble.com/Socket-Connection-closed-before-sending-all-data-td34503.html,
> except I use sockets instead of netconn.
> Did you manage to find a solution for your problem?
>
>
>
>
>
> --
> Sent from: http://lwip.100.n7.nabble.com/lwip-users-f3.html
>
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No I haven't found a proper solution to the problem. Adding a short 
delay (1ms) between my last netconn_write() and the netconn_close() 
works around the issue.

    while(1){
        // Accept any incoming connection
        accept_err = netconn_accept(osocketListen, &osocket);
        if(accept_err == ERR_OK){
            dl4printf("Listen: accept connection\n");
            netconn_set_recvtimeout(osocket, 10000);

            // Serve connection
            err = processRequest();

            // We shouldn't need this but TCP write packets can be lost 
if we don't for some reason
            delayMs(1);

            // Close connection
            netconn_close(osocket);

            // Delete connection
            netconn_delete(osocket);
            osocket = 0;
        }
    }