[avahi] Receive mDNS annoucnements

Jonathan Fitt jonfitt at yahoo.com
Fri Nov 21 14:08:17 PST 2014

Thanks! I'll give that a go and let you know how it goes. 


> On Nov 21, 2014, at 1:25 PM, Michael Jones <avahi at jonesmz.com> wrote:
>> Hello,I am looking for a way for a Linux machine to tell when I return home. My idea is that my iPhone will always do an mDNS announcement when it joins my home wifi. So I'm looking for a way to watch for mDNS announcements and perform and action if the right one is seen. Obviously the avahi-daemon is watching these all the time and updating its cache, so I was thinking that there might be a good place to start. However the only command line way I can see to get to the avahi-daemon cache is to send a SIGUSR1 to get it to dump to /var/log/syslog. Then I can look at the timestamp to determine the last time it registered and compare with now. That seems quite ugly though, and I don't like the idea of continually dumping to syslog.
>> So is there a way to make it more event driven with the avahi-daemon? I think from looking at the D-Bus API that might be the way to go?If it is the right approach, I would appreciate it if someone knew of a related chunk of source that I could use as a starting point.
>> Thanks!Jonathan
> Write a small program that uses the Avahi API. A very high level wrapper for the Avahi API is: https://github.com/johanneshilden/qtzeroconf
> Using that, you can detect your phone joining your home network in under 10 lines of code.
> Create the service browser object
> Connect that new object to a qt slot that'll respond to the new service joining your network, Tell the service browser object which services to listen for.
> From there, you can do whatever you want with the information. Perhaps you would want to send some kind of DBus signal to let other programs know. 
> I'm afraid I haven't investigated the DBus API, so I'm not certain I can give you any advice in that direction, but I have written apps using the high level Qt API that I linked above, and I've never had any trouble with it.
> --Michael Jones 
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