#3683 NORM First D: Long XO Names break presence/mesh

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#3683: Long XO Names break presence/mesh
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  Reporter:  BigBaaadBob       |       Owner:  smcv                  
      Type:  defect            |      Status:  assigned              
  Priority:  normal            |   Milestone:  First Deployment, V1.0
 Component:  presence-service  |     Version:                        
Resolution:                    |    Keywords:                        
  Verified:  0                 |  
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Changes (by smcv):

  * owner:  sjoerd => smcv
  * status:  new => assigned
  * component:  telepathy-salut => presence-service


Comment:

 The instance name in Salut can be up to 63 characters (limited by the mDNS
 protocol, so this is out of our control). Chrysanthemum at xo-12-34-56 is 25
 characters, and for activities, Salut tries to advertise
 activityidactivityid:Chrysanthemum at xo-12-34-56 (where activityidactivityid
 represents a 40-character hex activity ID, as currently implemented). This
 is *just* too long, so it fails.

 We could work around this in Presence Service by truncating the nickname
 part of the instance name to 10 characters (Chrysanthemum is 13
 characters). This isn't the nickname seen on the mesh view, which will be
 unaffected - it's just the instance name that will be seen in generic mDNS
 debug tools and possibly a few non-Telepathy link-local-XMPP clients - so
 I think this is an acceptable workaround.

 The longer-term fix would be to stop having to have the instance name in
 the activity advertisement, which will require some upstream Avahi fixes
 (and will also break interoperability with older XOs on the mesh, so
 ideally we should do this at the same time as some other incompatible
 protocol change, like the rMulticast change represented by the salut-
 needs-new-protocol keyword).

-- 
Ticket URL: <https://dev.laptop.org/ticket/3683#comment:9>
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