-----Original Message----- From: lwip-users <lwip-users-bounces+edmangzayzay=eaton....@nongnu.org> On Behalf Of goldsi...@gmx.de Sent: Friday, April 16, 2021 2:34 AM To: Mailing list for lwIP users <lwip-users@nongnu.org> Subject: Re: [lwip-users] [EXTERNAL] Understanding callback options for link/DHCP status.
Am 15.04.2021 um 22:55 schrieb Zayzay, Edman G: > In your lwipopts.h file, define the following… > > > > #define LWIP_NETIF_STATUS_CALLBACK 1 > > #define LWIP_NETIF_LINK_CALLBACK 1 > > > > Then in during your setup. Call these functions > > > > netif_set_status_callback(ppp->netif, status_cb); > > netif_set_link_callback(ppp->netif, link_cb); > > > > > > the status callback will function will get triggered when change is > happening on the interface. > > The link call back function will get triggered when the interface has > changed. In you link callback function, you can check if the link is > up/down by calling > > > > netif_is_up(netif); Sorry, but no. This function returns the administrative status. To get the link, call 'netif_is_link_up(netif)'. >> Thanks for the correction . Regards, Simon > > > > Hope it helps. > > > > ~Edman > > > > *From:* lwip-users > <lwip-users-bounces+edmangzayzay=eaton....@nongnu.org> *On Behalf Of > *Luciano Moretti > *Sent:* Thursday, April 15, 2021 4:20 PM > *To:* Mailing list for lwIP users <lwip-users@nongnu.org> > *Subject:* [EXTERNAL] [lwip-users] Understanding callback options for > link/DHCP status. > > > > Using LwIP 2.1.2 currently: > > LwIP provides several optional callbacks and I'm trying to figure out > when they're called and what steps I should take when I get one. > > > > Currently, I'm using netif_set_status_callback and it seems like this > is called when I receive a new IP address via DHCP. The documentation > says that it's called when an "interface is brought up/down" but this > doesn't seem to be the case: I don't get a call when I unplug my cable > and my cable handling calls netif_set_link_down() like I'd expect. > > > > I'm also seeing an issue where if I unplug the cable, change DHCP > server settings, then replug in the board is briefly pingable at the > old DHCP address prior to the new DHCP address being set. When I > detect the unplug should I use the netif_set_addr() function to set > the values back to the starting defaults of 0.0.0.0 for DHCP? > > > > There appears to be a NETIF_LINK_CALLBACK() and a > NETIF_EXT_STATUS_CALLBACK as well, but I can't find good documentation > on when those callbacks would be expected if I enable them. > > > > Thank you for any clarification you can provide. > > > _______________________________________________ > lwip-users mailing list > lwip-users@nongnu.org > https://lists.nongnu.org/mailman/listinfo/lwip-users > _______________________________________________ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users _______________________________________________ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users
