Re: [lwip-users] DHCP: IF not connected on power up

[Simon Goldschmidt]

"Bernhard \'Gustl\' Bauer" wrote:
> I set it up as described in dhcp.c and most time it works fine. But some 
> times it doesn't start a dhcp discover - I checked with wireshark.
> 
> Maybe I'm not patient enough. What is the longest time from plugging the 
> cable to getting an IP?

Was that really what you wanted to do? DHCP increases its retry timeout for 
every retry, so when you just start DHCP and plug the cable after some minutes, 
the retry timeout will already be quite high and thus it might take a long time 
until DHCP retries to find a server.

Instead, you should monitor your PHY and when it detects a link, call 
dhcp_start (or dhcp_reboot?). This ensures that the time from plugging the 
cable to getting an IP address is (nearly) constant.

Simon
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