<div dir="ltr">Hello James,<div><br></div><div>I included the new kernel (and reverted that commit) and now collaboration works even between fc20+S0.102 and F18+S0.100.</div><div><br></div><div>I tested it using a wifi network (with DHCP enabled) and Chat activity.</div><div><br></div><div>Really awesome work James!</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Sep 16, 2014 at 3:53 AM, James Cameron <span dir="ltr"><<a href="mailto:quozl@laptop.org" target="_blank">quozl@laptop.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Summary: partially solved with new kernel.<br> <br> The Chat activity was run with debug logging in Terminal:<br> <br> % SUGAR_LOGGER_LEVEL=debug sugar-launch org.laptop.Chat<br> <br> At the time the activity was shared, the log showed:<br> <br> 1410842095.436535 DEBUG sugar3.presence.activity: <_ShareCommand object at 0x527dc8 (sugar3+presence+activity+_ShareCommand at 0x4f7c20)>: Join finished DBusException(dbus.String(u'Failed to connect to multicast group'),)<br> <br> Telepathy Salut was failing to setup the multicast group, because it<br> was calling setsockopt with SO_REUSEPORT, because Fedora 20 header<br> files define SO_REUSEPORT, but the OLPC kernel did not.<br> <br> (It is bad that the failure was not reported to the user or to the<br> logs unless debug logging was turned on. If someone cares, they can<br> raise a bug.)<br> <br> Adding SO_REUSEPORT support to the kernel [2] solved for Salut over<br> networks where DHCP is available; such as wired or wireless access<br> points. The new kernel is in the dropbox [3]. The previous change to<br> avahi-daemon configuration is removed [4].<br> <br> A different problem occurs with Salut over link local addresses; IBSS<br> ad-hoc wireless. The buddy icons are missing.<br> <br> # avahi-browse -t _presence._tcp # shows no output<br> <br> References:<br> <br> 1.<br> <a href="http://code.metager.de/source/xref/freedesktop/telepathy/salut/lib/gibber/gibber-multicast-transport.c" target="_blank">http://code.metager.de/source/xref/freedesktop/telepathy/salut/lib/gibber/gibber-multicast-transport.c</a><br> <br> 2.<br> <a href="http://dev.laptop.org/git/olpc-kernel/log/?h=arm-3.5" target="_blank">http://dev.laptop.org/git/olpc-kernel/log/?h=arm-3.5</a><br> <br> 3.<br> <a href="http://rpmdropbox.laptop.org/f20-xo4/" target="_blank">http://rpmdropbox.laptop.org/f20-xo4/</a><br> kernel-3.5.7_xo4-20140916.0607.olpc.5196e01.armv7hl.rpm<br> <br> 4.<br> <a href="http://dev.laptop.org/git/projects/olpc-os-builder/commit/?id=f34ddb8b83ca6b9cb657e115df117ffa3704eea5" target="_blank">http://dev.laptop.org/git/projects/olpc-os-builder/commit/?id=f34ddb8b83ca6b9cb657e115df117ffa3704eea5</a><br> <div><div class="h5"><br> <br> On Thu, Sep 11, 2014 at 06:24:20PM +1000, James Cameron wrote:<br> > G'day,<br> ><br> > Activities shared by Fedora 20 systems do not appear in Network<br> > Neighbourhood on Fedora 18 or Fedora 20 systems. Buddies appear.<br> > Activities shared by Fedora 18 Sugar 0.98 systems appear.<br> ><br> > So this is a failure to announce sharing of activities on Sugar 0.102<br> > on Fedora 20.<br> ><br> > tcpdump shows mDNS packets for every operation except when an activity<br> > is shared on Fedora 20.<br> ><br> > avahi-browse output is consistent with Network Neighbourhood.<br> ><br> > avahi-browse -t _presence._tcp # for buddies<br> > avahi-browse -t _clique._udp # for activities<br> ><br> > (avahi-daemon needed tweaking to compensate for lack of SO_REUSEPORT<br> > support in 3.5 kernel; change /etc/avahi/avahi-daemon.conf to set<br> > disallow-other-stacks=yes)<br> ><br> > I have tried <a href="http://wiki.sugarlabs.org/go/BugSquad/Telepathy_Debugging" target="_blank">http://wiki.sugarlabs.org/go/BugSquad/Telepathy_Debugging</a><br> > but there is no interesting output corresponding to the event.<br> ><br> > I have used strace and seen possible D-Bus activity relating to the<br> > event. sendmsg(11, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\0\1<\0\0\0/\0\0\0\252\0\0\0\1\1o\0?\0\0\0/org/fre"..., 192}, {"+\0\0\<a href="http://0org.freedesktop.Telepathy.Ch" target="_blank">0org.freedesktop.Telepathy.Ch</a>"..., 60}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 252<br> ><br> > I welcome any suggestions for further diagnosing this problem.<br> ><br> > --<br> > James Cameron<br> > <a href="http://quozl.linux.org.au/" target="_blank">http://quozl.linux.org.au/</a><br> <br> --<br> James Cameron<br> <a href="http://quozl.linux.org.au/" target="_blank">http://quozl.linux.org.au/</a><br> _______________________________________________<br> </div></div>Devel mailing list<br> <a href="mailto:Devel@lists.laptop.org">Devel@lists.laptop.org</a><br> <a href="http://lists.laptop.org/listinfo/devel" target="_blank">http://lists.laptop.org/listinfo/devel</a><br> </blockquote></div><br></div>