Simple TCP client using lwip API data types like netconn() and netbuf()

Hi,

I am working on a FPGA board which is called Nano Board I want this to act as client and it should connect to the Asterisk server which acts like server. For implementing this i need some reference or example code which is "Simple TCP client using lwip API data types like netconn() and netbuf() ". searched a lot in web, but found examples only using socket programming which is not my area of interest.

Kind Regards,

Greek