Good day! I want to use PPP functionality of lwIP port on FreeRTOS+LPC2368. I don't know well lwIP stack, I just started to work with it. Could someone give me advices, how to start? I already have a port for my system, but lwIP's documnetation seems very insufficiently. Especially, PPP part. As far as I know, I should write two new functions: sio_read() and sio_write for PPP. But I don't know exactly what should they do.