[lwip-users] how to correctly release memory?

[boter]

I write a simple function using the lwip api .  the function is followed.

 

static void vProcessTCPConnection( struct netconn *pxNetCon )
{
struct netbuf *pxRxBuffer;
portCHAR *pcRxString;
unsigned portSHORT usLength;

 

      while((pxRxBuffer = netconn_recv( pxNetCon )) != NULL)
      {
            netbuf_data(pxRxBuffer, ( void * ) &pcRxString, &usLength);
            netconn_write(pxNetCon, pcRxString, usLength, NETCONN_COPY);
            //memp_free(MEMP_NETBUF, pxRxBuffer);
      }
      netbuf_delete( pxRxBuffer );

      netconn_close( pxNetCon );
}

 

   after I run the function , I connect to target running the funciton from a pc.

I input some characters, the pc endpoint will send these characters to target.

after the target received character, then send back .

   I found I only send 4 times. if I add memp_free(MEMP_NETBUF, pxRxBuffer);
I can send 16 times.

  

   Can anybody tell me how to correctly release the memory ?

 

thanks
Boter