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Re: [lwip-users] Correctly manage cable disconnection and reconnection

From: Simon Goldschmidt
Subject: Re: [lwip-users] Correctly manage cable disconnection and reconnection
Date: Sun, 9 Dec 2012 11:04:58 +0100

CORRADIN Michele wrote:

> I have some problems to correctly manage cable disconnection and 
> re-connection.
> Up to now I created a slow task that checks the PHY register to verify the 
> connection status and if I see a cable disconnection and re-connection I 
> restart the phi init in order to correctly set speed, .. but it's not clear 
> to me what I should do to "re-init" LWIP.

Whether you poll the phy registers from a slow thread or use the phy interrupt 
(if there is one) doesnt matter to lwIP. What's important is that you call 
lwip_set_link_up() or lwip_set_link_down() after detecting link changes. Note 
that it's very important to call these functions in the lwIP thread, not from 
your low prio thread or from an ISR!

Calling these functions mainly triggers AutoIP and dhcp to take action after 
the link has been reestablished.


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