Re: [lwip-users] [EXTERNAL] Understanding callback options for link/DHCP status.

[address@hidden]

Am 15.04.2021 um 22:55 schrieb Zayzay, Edman G:
> In your lwipopts.h file, define the following…
>
>  
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> #define LWIP_NETIF_STATUS_CALLBACK      1
>
> #define LWIP_NETIF_LINK_CALLBACK        1
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>  
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> Then in during your setup. Call these functions
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>  
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> netif_set_status_callback(ppp->netif, status_cb);
>
> netif_set_link_callback(ppp->netif, link_cb);
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>  
>
>  
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> 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
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>  
>
> netif_is_up(netif);

Sorry, but no. This function returns the administrative status. To get
the link, call 'netif_is_link_up(netif)'.

Regards,
Simon

>
>  
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> Hope it helps.
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>  
>
> ~Edman
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>  
>
> *From:* lwip-users
> <lwip-users-bounces+edmangzayzay=eaton.com@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?
>
>  
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> 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.
>
>
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