Re: [lwip-users] how lwip know internet cable is unplug

[vincent cui]

But if booting, there is no cable plugged in, how about ?

锘?Vincent Cui
Sr.Firmware Engineer
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-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Simon Goldschmidt
Sent: 2011年9月7日 16:30
To: Mailing list for lwIP users
Subject: Re: [lwip-users] how lwip know internet cable is unplug

vincent cui <address@hidden>
> You mean that I could polling the link status in a low priority task, the
> task does
> 1. disable dhcp if dhcp is enable in link loss case
> 2. enable dhcp if dhcp is disable in link recover case.

You don't need to do that: lwIP handles calling dhcp itself if you just call 
netif_set_link_up/down.

> The link status from loss to recover will happen one time at boot
> time...so the dhcp enable will put the task too ?

No, I initialized it once after booting so that change didn't happen after 
botting.

Simon
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