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

[openocd]

I use timeouts so netconn_recv is only waiting 20 ticks or milliseconds
(can't remember right now) before the code continues and netconn_write is
called. I have double checked it.


> 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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>>
>
>
>
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