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

[Zayzay, Edman G]

-----Original Message-----
From: lwip-users <lwip-users-bounces+edmangzayzay=eaton.com@nongnu.org> On 
Behalf Of goldsimon@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.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?
>
>  
>
> 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
>


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