#ifdef USE_DHCP/* Update DHCP state machine */DHCP_state = DHCP_LINK_DOWN;#endif/* USE_DHCP *//* When the netif link is down this function must be called.*/netif_set_down(netif);#ifdefUSE_LCDLCD_UsrLog ("The network cable is not connected \n");#elseBSP_LED_Off(LED1); BSP_L...