Re: [lwip-users] mDNS

[Louis Demers]

It does seem like the zynq never sees the multicast packets and so does not respond when requested.

Since it works only once when i register the service and one packet does get out, After ttl seconds, it never responds to queries...

Xilinx has a funky build process where the lwipopts.h files gets automatically generated by their Eclipse GUI interface and include files are copied to a working build directory prior to the build... I suspect some defines do not get set appropriately because when i look at some lwip source files, huge chunks are flagged by eclipse as inactive... i.e.. most of dns.c 

Also saw some comments that said that special action needed to be taken by calling

ip_set_option(l_udp_pcb, SOF_BROADCAST);

to enable a response to multicast broadcast, which i expected should be done in the mdns module, not at the application level ???

still much investigation to do to figure out why the defines don't seem to stick !

Louis Demers Eng.

address@hidden

On Dec 17, 2017, at 17:50, Erik Ekman <address@hidden> wrote:

If your network interface filters out incoming multicast packets at the MAC layer it would look just like this I believe.

On 16 December 2017 at 15:15, Dirk Ziegelmeier <address@hidden> wrote:

Did you configure your netif to receive broadcasts?

Do you call

mdns_resp_netif_settings_changed()

when your link state / IP changes? This will trigger a broadcast.

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

Ciao
Dirk

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