!CONFIG
page_bgcolour = (255, 255, 255)
text_fgcolour = (0, 0, 0)
text_font_size = 48
---
!IMG:telepathy.png
---
*>>>Telepathy

Dafydd Harries, Collabora Ltd.
---
*>>>What is Telepathy?

- A D-Bus API
- A collection of protocol implementations
---
*>>>Why?
---
*>>>Existing clients

- Difficult to implement many protocols
- Too simple (not enough features)
- ...or too complicated (too hard to use)
- Don't share information
- ...poor desktop integration
---
!IMG:old.png
---
!IGNORE
*>>>>>>>\:(
---
*>>>Code reuse

- Language independence
- Desktop independence
- Licence independence
---
*>>>Security

- Protocol code is isolated from UI
---
*>>>Robustness

- Failing components can be restarted
---
*>>>Connection reuse

- Separate applications for chat/voip
- Panel applets
---
*>>>In short

- Making writing messaging programs easier
- Paving the way to messaging users can love
- Hiding differences between protocols
- Return to UNIX way
---
!IMG:new.png
---
!IGNORE
*>>>>>>>\\o/
---
*>>>Why not...
---
*>>>Why not...

...use libgaim?
- assumes the presence of a UI
- lose language/licence/desktop independence
- lose security benefits
- lose connection reuse
---
*>>>Why not...

...a new C library?
- lose language/licence/desktop independence
- lose security benefits
- lose connection reuse
---
*>>>Why not...

...use Jabber transports?
- server-dependent
- limited to things that Jabber can support
- lose connection reuse
---
*>>>Where we're at
---
*>>>Features

- text chat
- multi-user text chat
- link-local chat
- contact list
- presence (online, out to lunch, etc.)
- voice calls
- video calls
- avatars
---
!IMG:n800.jpg
---
*>>>Nokia N800

- Video calling
- XMPP IM
---
*>>>How does it work?
---
!IMG:bits.png
---
*>>>Components
---
*>>>Connection Managers

- XMPP (Gabble)
- link-local XMPP (Salut)
- IRC (Idle)
- MSN (Butterfly)
- Oscar (Wilde)
---
*>>>Clients

- Gossip
- Kopete
---
*>>>Other Components

- Stream engine
- Python library
- Client library (libtelepathy) (Bad)
- Connection manager library (libtelepathy-glib)
- KDE integration (Decibel)
- utility libraries (Tapioca)
---
*>>>The Future
---
!IMG:olpc.jpg
---
*>>>One Laptop Per Child

- Activity sharing
---
*>>>Application Data Channels

- making remote IPC trivial
- NAT traversal
- remote D-Bus
---
*>>>Tubes

making remote IPC trivial
NAT traversal
remote D-Bus
---
*>>>Stream Engine

- Sucks horribly
- Is going away
- Stream Engine is dead...
- ...long live libtelepathy-stream-engine!
---
*>>>More Features

- File transfer
- Logging
---
*>>>More Protocols

- SIP
- ...
---
*>>>Questions?