Re: [lwip-users] Assertions when using DHCP when using LWIP 2.0

[Neerav Patel]

After debugging and reading the documentation further I think the problem is with me trying to set up another connection using RAW UDP.

struct udp_pcb *pcb = udp_new();
if ( pcb != NULL )
{
   udp_bind( pcb, IP_ADDR_ANY, 5600 );
   udp_recv( pcb, udp_receive, NULL );
}

If I have NO_SYS=0, I dont think I can do the above anymore?  I have to use the high level API since the above wouldnt be thread safe?

Thanks for the response.

---

From: lwip-users <lwip-users-bounces+address@hidden> on behalf of Sergio R. Caprile <address@hidden>
Sent: January 23, 2017 2:21 PM
To: address@hidden
Subject: Re: [lwip-users] Assertions when using DHCP when using LWIP 2.0

 

Oops...
http://www.nongnu.org/lwip/2_0_0/upgrading.html

lwIP: Upgrading

www.nongnu.org

This file lists major changes between release versions that require ports or applications to be changed. Use it to update a port or an application written for an ...

   * 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

My mistake, you seem to be doing things the right way for 2.0+

Please give details about your port and where did you get the code from.
Try to "manually exercise your code" (debug) to see why you are getting
those nulls.
Does it happen right on first call or after a while ?

Your mainloop is ... ?
You are not calling lwIP from within the mainloop and interrupts... are
you ?



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