Re: Telepathy Salut on Sugar 0.102 on Fedora 20 almost works

[Kevin Gordon Gmail]

James, didn't we have an avahi workaround for ‎this kinda thing before in the olden days, where having a simultaneous USB Ethernet and wireless connection  caused self-assigned addresses to mess up the buddy visibility? I may be mis-remembering, or it may have been an unrelated issue, but forgive me, for I  did live a full life in the seventies. :-) Cheers, KG Sent from my currently functioning gadget From: Martin Abente Sent: Tuesday, September 16, 2014 14:15 To: James Cameron Cc: XO Laptop Developers; Sugar-dev Devel Subject: Re: Telepathy Salut on Sugar 0.102 on Fedora 20 almost works James, Gonzalo, Regarding the IBSS/Ad-hoc scenario, if I set the address manually, collaborations work just fine. So this must be related to network discovery. My test goes like this: * I use one XO with fc18+S0.100 to create an ad-hoc network network. * From another XO, with fc20+S0.102, I connect to that ad-hoc network. The second XO ip address does not match the first one's network. But when I manually configure it, then buddy icons appears and collaboration works...  On Tue, Sep 16, 2014 at 11:01 AM, Martin Abente <martin.abente.lah...@gmail.com> wrote: Hello James, I included the new kernel  (and reverted that commit) and now collaboration works even between fc20+S0.102 and F18+S0.100. I tested it using a wifi network (with DHCP enabled) and Chat activity. Really awesome work James! On Tue, Sep 16, 2014 at 3:53 AM, James Cameron <qu...@laptop.org> wrote: Summary: partially solved with new kernel. The Chat activity was run with debug logging in Terminal:         % SUGAR_LOGGER_LEVEL=debug sugar-launch org.laptop.Chat At the time the activity was shared, the log showed: 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'),) Telepathy Salut was failing to setup the multicast group, because it was calling setsockopt with SO_REUSEPORT, because Fedora 20 header files define SO_REUSEPORT, but the OLPC kernel did not. (It is bad that the failure was not reported to the user or to the logs unless debug logging was turned on.  If someone cares, they can raise a bug.) Adding SO_REUSEPORT support to the kernel [2] solved for Salut over networks where DHCP is available; such as wired or wireless access points.  The new kernel is in the dropbox [3].  The previous change to avahi-daemon configuration is removed [4]. A different problem occurs with Salut over link local addresses; IBSS ad-hoc wireless.  The buddy icons are missing.         # avahi-browse -t _presence._tcp # shows no output References: 1. http://code.metager.de/source/xref/freedesktop/telepathy/salut/lib/gibber/gibber-multicast-transport.c 2. http://dev.laptop.org/git/olpc-kernel/log/?h=arm-3.5 3. http://rpmdropbox.laptop.org/f20-xo4/ kernel-3.5.7_xo4-20140916.0607.olpc.5196e01.armv7hl.rpm 4. http://dev.laptop.org/git/projects/olpc-os-builder/commit/?id=f34ddb8b83ca6b9cb657e115df117ffa3704eea5 On Thu, Sep 11, 2014 at 06:24:20PM +1000, James Cameron wrote: > G'day, > > Activities shared by Fedora 20 systems do not appear in Network > Neighbourhood on Fedora 18 or Fedora 20 systems.  Buddies appear. > Activities shared by Fedora 18 Sugar 0.98 systems appear. > > So this is a failure to announce sharing of activities on Sugar 0.102 > on Fedora 20. > > tcpdump shows mDNS packets for every operation except when an activity > is shared on Fedora 20. > > avahi-browse output is consistent with Network Neighbourhood. > >       avahi-browse -t _presence._tcp # for buddies >       avahi-browse -t _clique._udp # for activities > > (avahi-daemon needed tweaking to compensate for lack of SO_REUSEPORT > support in 3.5 kernel; change /etc/avahi/avahi-daemon.conf to set > disallow-other-stacks=yes) > > I have tried http://wiki.sugarlabs.org/go/BugSquad/Telepathy_Debugging > but there is no interesting output corresponding to the event. > > I have used strace and seen possible D-Bus activity relating to the > 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\0org.freedesktop.Telepathy.Ch"..., 60}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 252 > > I welcome any suggestions for further diagnosing this problem. > > -- > James Cameron > http://quozl.linux.org.au/ -- James Cameron http://quozl.linux.org.au/ _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel

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