Re: [lwip-users] Thread awareness

[Sergio Sider]

Hi guys,

 

I have a question abou the dns in lwip 1.3 (raw api)

 

I was using lwip 1.2 for a while (luminary - cortex) implementation, and glued a dns resolver that was available somewhere. It worked fine.

Now I am "upgrading" to 1.3, and started clean without my crap code. Actually , everything is working fine, except one thing:

 

Sometimes, the resolver does nothing. The call to dns_gethostbyname returns with ERR_INPROGRESS as expected, but the query packets are not sent and the callback function is never called, even after the timeouts... (everything else works, I can ping the interface, webserver is working, and so on). I noticed it only occurs if I call dns_gethostbyname right after initializing lwip (using fixed IP). If I use DHCP or I wait a few seconds after I set the static IP, it works.  In the case of the fixed IP, do I have to wait something to begin sending data ?

 

Does anyone have an idea of what might be going on ?

 

Thanks!!

Sergio P. Sider.