UDP Server not receiving when connecting cable after power-on

Hi,

I have an UDP Server on a STM32F407Disc1. It works very good, but when the ethernet cable is already connected when I power on the board.

However, if I connect the cable after powering on the board, UDP Server does not receive any message.

My UDP Server is initiated before the while(1) loop, and I have MX_LWIP_Process() inside this while.

I have also added LWIP_NETIF_LINK_CALLBACK 1 to lwipopts.h and ethernetif_set_link(&gnetif) inside my MX_LWIP_Process function.

Where's the problem? The link status (if connected or not) is detected.

Thanks a lot!

Kind regards.

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Best answer by Vangelis Fortounas

Hello

Define this function that is already weak..

if DHCP is used add also dhcp_start(netif); and dhcp_release_and_stop(netif); accordingly

void ethernetif_notify_conn_changed(struct netif *netif)

{

if(netif_is_link_up(netif))

netif_set_up(netif);

else

netif_set_down(netif);

}

Visitor II