I am not able to identify place or api in code through which I can receive
data send through pc using echotool in code, also How I can send data to
host PC using tcpecho. like I send "hello" from my host pc, I want to
receive hello in controller card and send some known data to host PC.
See for example in LWIP_TCPECHO_FREERTOS in tcpecho.c inside a thread using
netbuf_data(buf, &data,len) inside tcpecho_thread receiving data and
netconn_write to write data.