Re: [lwip-users] mDNS Service Search Not Working

[Niall Begley]

Hmm yeah, I guess I just checked out the code and stupidly assumed master was a stable release.

Still, loads of development has been put into mDNS in general including the service search, there must be a way to get it to work

On Wed, Sep 9, 2020 at 1:40 PM Manu Abraham <abraham.manu@gmail.com> wrote:

I have the 2.1.2 release. There is no such function in there.
Maybe you are looking at the development tree ?
I see it in the git tree. Haven't tried it yet.

On Wed, Sep 9, 2020 at 10:53 PM Niall Begley <nbegley@gmail.com> wrote:
>
> Yes, I agree that it appears the mDNS functionality as-is only works as outgoing only.
>
> After turning on debug logging on both the ip4 and ethernet layers, I believe I determined that while incoming mDNS broadcasts are out there and being sent (confirmed by wireshark), I'm not seeing any of them come in at all on the ethernet layer. I'm pretty new to this but maybe I've missed something that needs to be done while setting up my netif? I'm seeing other broadcast messages sent to my 192.168.1.255 / ff:ff:ff:ff:ff:ff just fine but none of the mDNS ones.
>
> I have to imagine there is a way to make this work because I can't imagine someone went to the effort to write the service search code if they didn't have a way to get responses back to the search queries being sent out.
>
> On Wed, Sep 9, 2020 at 11:46 AM Manu Abraham <abraham.manu@gmail.com> wrote:
>>
>> Hi,
>>
>> I had the same question, in a different way. It appears to me that
>> mDNS is advertise only.
>> Was having similar thoughts what you outlined, since no one replied.
>>
>> http://lwip.100.n7.nabble.com/dhcp-and-mdns-responder-tt35983.html#a35984
>>
>> Thoughts of an anechoic chamber, pass by ..
>>
>>
>> Best Regards,
>>
>> Manu
>>
>>
>> On Wed, Sep 9, 2020 at 8:09 PM Niall Begley <nbegley@gmail.com> wrote:
>> >
>> > Hi everyone,
>> >
>> > I'm new to both lwip and mdns and I'm trying to use mdns_search_service() to search for a service on my network (any service, really, I just want to see it work) but I'm having trouble.  The callback I provide is never being called even though from what I can tell from wireshark the mDNS query is making it out there and is being responded to.
>> >
>> > I saw that someone else had this exact same issue (http://lwip.100.n7.nabble.com/mDNS-question-td34016.html) but it doesn't look like there were any follow ups.
>> >
>> > I don't see any documentation for either mdns_search_service or mdns_search_stop outside of comments in the code, so I don't know if these are really used by anyone?  Does anyone have experience with this that could help me out?
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