Hi again Youness,<div>thanks a lot for your help.</div><div>I believe I solved the problems you pointed before.</div><div>I am using a dumb method to exchange candidates. I write them to file and exchange them using a ftp server (I will improve it later).</div> <div><br></div><div>So, the way I run it is:</div><div>(HostA) ./client l</div><div>(HostB) ./client r</div><div>//local candidates are gathered and written to file</div><div>(HostA) put leftCands.bin on FTP and get rightCands.bin</div> <div>(HostB) put rightCands.bin on FTP and get leftCands.bin</div><div>//read local credentials and write them on the remote host</div><div><br></div><div>I am using a relay server, that should work as a last resort. But during the local candidate gathering, sometimes it gets a relayed candidate, but most of the times it doesn't. Can it be related with timeouts?</div> <div><br></div><div>Either way, it can never get a pair a establish a connection. :(</div><div>I don't have a clue why this happens..</div><div><br></div><div>Can you please have a look?</div><div><br></div><div>Cheers,</div> <div>Tiago</div><div><br></div><div><br><div class="gmail_quote">On Fri, Nov 4, 2011 at 2:03 PM, Youness Alaoui <span dir="ltr"><<a href="mailto:youness.alaoui@collabora.co.uk">youness.alaoui@collabora.co.uk</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Hi again Tiago,<br> <br> For the remote candidates, you will need a third party server to exchange that<br> information, usually the candidates would be sent over SIP or XMPP for example.<br> ICE cannot work if you don't have a third party server with which you can<br> reliably exchange candidates. For testing purposes you could have it print the<br> candidates to stdout, and you could copy/paste that into stdin of the other<br> instance and have it parse the input.. or you could hardcode a port to connect<br> to and do the candidate exchange.. there's no easy way of doing that though.<br> You cannot hardcode the candidates because the port used will be random<br> everytime, also, you will need to exchange the randomly generated<br> username/password (nice_agent_get_local_credentials +<br> nice_agent_set_remote_credentials) to make the connectivity checks work.<br> <br> As for your example, here are a few comments :<br> 1 - you call the nice_agent_set_relay_info with stream_id being uninitialized,<br> you must call it *after* you do the nice_agent_add_stream...<br> 2 - you don't need those GValues, you can just do<br> g_object_set (G_OBJECT(agent),<br> "stun-server", "66.228.45.110",<br> "stun-server-port", 3478,<br> NULL);<br> 3 - You shouldn't set the remote credentials as the same as the local ones<br> 4 - In your print_candidate_info, you may also want to print the port used.<br> <br> I hope this helps, let me know if you have further questions.<br> <br> Youness.<br> <div class="im"><br> <br> On 11/03/2011 12:57 PM, Tiago Sá wrote:<br> > Hi Youness,<br> ><br> > I have been trying to create a simple application based on the first link you<br> > pointed before.<br> > Thanks for the tips you gave me. I have a couple of questions though, if you can<br> > help me.<br> ><br> > I need to find a way to get the remote candidates passed from a peer to another.<br> > Can you point an easy way to do that?<br> > Could I hardcode the remote candidates list, for testing purposes?<br> ><br> > Right now, I only get two local candidates (HOST and SERVER_REFLEXIVE).<br> > I am trying to use the numb TURN server, shouldn't I get a RELAYED candidate too?<br> ><br> > I am attaching the code. Can you please have a look at the code and check where<br> > the error could be?<br> ><br> > Thanks for helping!<br> ><br> > Regards,<br> > Tiago Sá<br> ><br> ><br> > On Wed, Oct 19, 2011 at 10:53 PM, Youness Alaoui <<a href="mailto:youness.alaoui@collabora.co.uk">youness.alaoui@collabora.co.uk</a><br> </div><div><div class="h5">> <mailto:<a href="mailto:youness.alaoui@collabora.co.uk">youness.alaoui@collabora.co.uk</a>>> wrote:<br> ><br> > Hi,<br> ><br> > Welcome to the world of libnice :)<br> > Yes, doing NAT traversal is far from being easy, the only solution is pretty<br> > much to use the ICE specification and that's not easy to implement, so that's<br> > why you'd need to use libnice.<br> ><br> > For an example, you can have a look at the unit tests, like<br> > tests/test-fullmode.c for example, although that does a lot of stuff. You can<br> > see a quick example in the documentation for NiceAgent :<br> > <a href="http://nice.freedesktop.org/libnice/NiceAgent.html" target="_blank">http://nice.freedesktop.org/libnice/NiceAgent.html</a><br> ><br> > For smaller examples, you can look at the libnice mailing list archives, some<br> > people posted their example code where they were having problems. For example, a<br> > very simple example can be seen here :<br> > <a href="http://lists.freedesktop.org/archives/nice/2011-January/000404.html" target="_blank">http://lists.freedesktop.org/archives/nice/2011-January/000404.html</a><br> > But make sure to click on the "Next message" to read the whole thread because<br> > that example had a bug that I explained how to fix in the following emails.<br> > Same for this thread :<br> > <a href="http://lists.freedesktop.org/archives/nice/2011-October/000434.html" target="_blank">http://lists.freedesktop.org/archives/nice/2011-October/000434.html</a><br> ><br> > I hope that helps,<br> > Youness.<br> ><br> > On 10/19/2011 09:58 AM, Tiago Sá wrote:<br> > > Hi all,<br> > ><br> > > my name is Tiago Sá, I am a junior researcher from Portugal and this is my<br> > first<br> > > mail to this list.<br> > > I have a NAT traversal problem to solve and I have been looking for a solution<br> > > during the last weeks, which, as I found out, is not so trivial as I<br> > thought before.<br> > > As stated on the libnice homepage, libnice seems to be what I am looking for:<br> > ><br> > > "ICE is useful for applications that want to establish peer-to-peer<br> > UDP data<br> > > streams. It automates the process of traversing NATs and provides security<br> > > against some attacks. It also allows applications to create reliable<br> > streams<br> > > using a TCP over UDP layer."<br> > ><br> > ><br> > > I have been looking for the provided documentation and I am feeling kind<br> > of lost.<br> > > Is there any example application or tutorial to get started?<br> > > Could you please share a basic application of this kind or point me a<br> > direction?<br> > ><br> > ><br> > > Thanks in advance for your help.<br> > ><br> > > Regards,<br> > > Tiago Sá<br> > ><br> > > --<br> > > Tiago Sá<br> > > Universidade do Minho, Braga - Portugal<br> > ><br> > > <a href="http://about.me/tiagosa/" target="_blank">http://about.me/tiagosa/</a><br> > ><br> > ><br> > ><br> > > _______________________________________________<br> > > Nice mailing list<br> </div></div>> > <a href="mailto:Nice@lists.freedesktop.org">Nice@lists.freedesktop.org</a> <mailto:<a href="mailto:Nice@lists.freedesktop.org">Nice@lists.freedesktop.org</a>><br> <div class="im">> > <a href="http://lists.freedesktop.org/mailman/listinfo/nice" target="_blank">http://lists.freedesktop.org/mailman/listinfo/nice</a><br> ><br> ><br> ><br> > _______________________________________________<br> > Nice mailing list<br> </div>> <a href="mailto:Nice@lists.freedesktop.org">Nice@lists.freedesktop.org</a> <mailto:<a href="mailto:Nice@lists.freedesktop.org">Nice@lists.freedesktop.org</a>><br> <div class="im">> <a href="http://lists.freedesktop.org/mailman/listinfo/nice" target="_blank">http://lists.freedesktop.org/mailman/listinfo/nice</a><br> ><br> ><br> ><br> ><br> > --<br> > Tiago Sá<br> > Universidade do Minho, Braga - Portugal<br> </div>> <a href="http://www.tiagosa.com" target="_blank">www.tiagosa.com</a> <<a href="http://www.tiagosa.com" target="_blank">http://www.tiagosa.com</a>><br> ><br> <br> <br> </blockquote></div><br><br clear="all"><div><br></div>-- <br>Tiago Sá<br>Universidade do Minho, Braga - Portugal<div><img src="http://wac.2659.edgecastcdn.net/802659/production80/images/icons/favicon.ico"> <a href="http://www.tiagosa.com" target="_blank">www.tiagosa.com</a><br> </div><br> </div>