Re: [lwip-users] POST data using several packets

[address@hidden]

When "no data is being sent", does the code even reach netconn_write 
(wherever it is, it isn't in the code below), or could it be that it is 
stuck in the second call to netconn_recv (which is blocking, so does not 
return until there is more data!). If netconn_write was called, did you 
check its return value?

I might be wrong, but as netconn_recv is blocking, I guess until the 
connection is closed, it will never return NULL, so your loop never ends.

Simon


Jesper Vestergaard wrote:
> Kieran Mansley wrote:
>   
> > On Wed, 2009-06-24 at 14:03 +0200, Jesper Vestergaard wrote:
> >   
> >     
> > > what is the prober way of assembling 
> > > the data from a arbitrary number of packets?
> > >     
> > >       
> > Call netconn_recv() repeatedly and concatenate the data you get until
> > you have as much as you want.
> >
> > Kieran
> >   
> >     
> I have tried calling netconn_recv() repeatedly but a problem has 
> occured. I get the data fine but when i will respond to the request with 
> netconn_write(pxNetCon, cDynamicPage, (u16_t)strlen( cDynamicPage ), 
> NETCONN_COPY ); no data is being sent. The code for retrieving the data 
> is here:
>
> /pxNetCon->recv_timeout=20;
>      
>     /* Data is ready */
>     pxRxBuffer = netconn_recv( pxNetCon );     
>  
>         pcRxString = pvPortMalloc( mem_size );
>         do
>         {
>             /* Where is the data? */
>             netbuf_data( pxRxBuffer, ( void * ) &(pcRxString2), 
> &usLength );
>                  
>             /* Allocate memory for the data */
>             mem_size = mem_size + usLength;
>             pcRxString = pvPortRealloc( pcRxString, (mem_size) );
>          
>             /* In the first iteration we can copy the data as it is */
>             if (mem_size == usLength)
>             {
>                 memcpy(pcRxString, pcRxString2, usLength);
>             }
>             else
>             {
>                 pcRxString3 = pvPortMalloc( usLength + 1 );
>                 memcpy(pcRxString3, pcRxString2, usLength);
>                 /* We use string functions on a char array so add a null 
> terminator */
>                 pcRxString3[usLength] = '\0';
>                 strcat( pcRxString, pcRxString3 );
>                 vPortFree( pcRxString3 ); 
>             }         
>             netbuf_free( pxRxBuffer );
>             pxRxBuffer = netconn_recv( pxNetCon );
>             //pxRxBuffer = NULL;
>         }
>         /* if theres is no more packets in the buffer proceed */
>         while (pxRxBuffer != NULL);/
>
>
> If I comment the pxRxBuffer = netconn_recv( pxNetCon ); line and 
> uncomment pxRxBuffer = NULL; The data is sent like it should.
> What is causing that and how do i fix it so i can recive multiple 
> packets but still respond to the request?/
> /
>
>
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