Re: [lwip-users] FW: Problem by sending of UDP broadcast frame

[simeon.trifonov]

I solved my problem. It is not enough only to set the netif up, but also the link must be up. And I didn’t control the link up to now. I understand that this is a problem with my code, but it worked with LWIP 1.4.1, therefore I couldn’t see this problem.

Thanks for the guidelines!

Simeon

 

From: lwip-users [mailto:address@hidden On Behalf Of Dirk Ziegelmeier
Sent: Wednesday, October 04, 2017 11:22 AM
To: Mailing list for lwIP users <address@hidden>
Subject: Re: [lwip-users] FW: Problem by sending of UDP broadcast frame

 

http://www.nongnu.org/lwip/2_0_x/upgrading.html

(2.0.0)

  ++ Application changes:

  * Changed netif "up" flag handling to be an administrative flag (as opposed to the previous meaning of

    "ip4-address-valid", a netif will now not be used for transmission if not up) -> even a DHCP netif

    has to be set "up" before starting the DHCP client

​This information could have also be obtained by simply stepping through your udp_sendto() until you reach the bottom of ip4_route() in a debugger.​