Hello Norbert
If you want to achieve this, you may not use the netconn or socket API. You 
need to have a raw TCP implementation. 

Both APIs are handling the tasking and the actual connection for you. 

Kind regards
Michael

Am 23. April 2015 14:56:32 MESZ, schrieb "Tóth Norbert" <[email protected]>:
>Hi Folks,
>
>I'm working on a microcontroller application with FreeRTOS + LwIP
>1.4.1.
>The situation: I'm reading data from the SD card via SPI and send it
>over
>TCP connection (with netconn API). Currently it's done by:
>copy data into buffer
>put buffer into netconn_write()
>
>The question is:
>How can I get the buffer of the connection and write directly into it?
>
>Regards,
>Norbert
>
>
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