[libnice] why it takes so long (3 second) to get Local candidates?

[Tom Chen]

Olivier,

The delay is in waiting for candidates gathering done signal not in waiting for component state changed. If i don't wait for the candidates gathering done signal, then the nice_agent_get_local_candidates( ) will always return Null, thus no candidate.

Tom

> From: olivier.crete at collabora.com
> To: felixschlitter at gmail.com; nice at lists.freedesktop.org
> Date: Thu, 15 Oct 2015 12:01:43 +0100
> Subject: Re: [libnice] why it takes so long (3 second) to get Local candidates?
> 
> Hello,
> 
> libnice will do a STUN query from every local interface, in case you
> have a multi-homed device, so if some of them are not Internet
> connected, then it waits for all of them to timeout. You can just
> ignore the state change and start sending candidates earlier if the
> delay is unacceptable for your application.
> 
> Olivier
> 
> On Thu, 2015-10-15 at 18:25 +1300, Felix Schlitter wrote:
> > I found that it can take a long time if I leave libnice to figure out
> > my local interfaces. If I tell which local address I want to use,
> > it's a lot faster. But that may have been because it tried to use a
> > local interface that had no internet connection. Maybe see if
> > `nice_agent_add_local_address` does anything for you.
> > 
> > On Thu, Oct 15, 2015 at 6:01 PM, tom chen <chentom60 at hotmail.com>
> > wrote:
> > > Hello,
> > >  
> > > I am using an external public STUN server,
> > > stun.l.google.com(74.125.194.127), port: 19302, to try
> > > /examples/simple-example.c.
> > >  
> > > simple-example can get its public IP as expected from this STUN
> > > server, so the public STUN server really works. However, I notice
> > > that, somehow, it takes around 3 second to get local candidate
> > > list. Any idea why so long? Then I installed a local STUN server in
> > > our intranet, still has same delay. I am wondering if there is
> > > anything waiting for some events during the gathering but always
> > > timeout?
> > >  
> > > Tom
> > >  
> > > tao at ubuntu:~/workspace/libnice-0.1.13/examples$ ./simple-example 1
> > > 74.125.194.127 19302
> > > Copy this line to remote client:
> > >  
> > >   vPRk owHFru8Z6Dx8hj9TKel7Zl
> > > 1,2013266431,fe80::20c:29ff:fe34:d0c8,42411,host
> > > 2,1019216383,fe80::20c:29ff:fe34:d0c8,0,host
> > > 3,1015022079,fe80::20c:29ff:fe34:d0c8,50240,host
> > > 4,2013266431,fe80::20c:29ff:fe34:d0be,51731,host
> > > 5,1019216383,fe80::20c:29ff:fe34:d0be,0,host
> > > 6,1015022079,fe80::20c:29ff:fe34:d0be,43916,host
> > > 7,2013266431,fe80::20c:29ff:fe34:d0b4,35004,host
> > > 8,1019216383,fe80::20c:29ff:fe34:d0b4,0,host
> > > 9,1015022079,fe80::20c:29ff:fe34:d0b4,51142,host
> > > 10,2013266431,192.168.0.60,33635,host
> > > 11,1019216383,192.168.0.60,0,host
> > > 12,1015022079,192.168.0.60,51301,host
> > > 13,2013266431,172.16.1.129,41734,host
> > > 14,1019216383,172.16.1.129,0,host
> > > 15,1015022079,172.16.1.129,46629,host
> > > 16,2013266431,10.113.54.60,41481,host
> > > 17,1019216383,10.113.54.60,0,host
> > > 18,1015022079,10.113.54.60,33328,host
> > > 19,1677722111,204.96.168.3,41481,srflx        ç Public IP
> > > candidates
> > > 20,847249919,204.96.168.3,0,srflx
> > > 21,843055615,204.96.168.3,33328,srflx
> > >  
> > > Enter remote data (single line, no wrapping):
> > > > ^C
> > > 
> > > 
> > > 
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> -- 
> Olivier Crête
> olivier.crete at collabora.com
> 
> 
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