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MobileRC

MobileRC. Will Worden Jackie Huynh Chris Shrives. What does it do?. Use your cell phone as a remote control for a media control center Two sides – Computer Side application and Phone Side application. Technologies involved. WLAN connection between phone and computer

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MobileRC

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  1. MobileRC Will Worden Jackie Huynh Chris Shrives

  2. What does it do? • Use your cell phone as a remote control for a media control center • Two sides – Computer Side application and Phone Side application

  3. Technologies involved • WLAN connection between phone and computer • Phone that can run J2ME application (We tested on a Nokia e71/ Symbian S60 FP2) • Computer side requires Python, VLC Player (default player)

  4. How do we do it? • Interpreter runs on computer, Phone connects to. Interpreter parses commands from phone and passes them to VLC for execution INTERPERTER TCP TCP

  5. Phone Side • J2me application • Connects over Wireless LAN rather than over the air through cellular network • No data costs associated with it • TCP /UDP connection, predefined ports

  6. Phone Side • Networking aspects • Finding Peers • Features both manual entry (history of previous connections stored locally on phone) • Automated peer detection on WLAN • UDP broadcast on subnet to find listening peers

  7. Peerfinding Registrar Service

  8. Peerfinding Broadcast Address Message hashed with md5

  9. Peerfinding Password matched, Connect

  10. Phone Side • TCP message commands after connection established • Predefined port on Computer Side, OS assigns Phone side port

  11. Problems Encountered on PhoneSide • Problems found: Many wireless routers don’t allow broadcast msg • Nokia does not recognize 255.255.255.255 as valid host • Symbian does not allow phone to report its own IP address (Security feature) • Nokia phones cannot connect to an address with port 80 (Midlet must be signed by trusted authority such as Verisign or Thawte) • Workaround: Connects to a registrar service that provides the IP information.

  12. ComputerSide (Interpreter) • Python 2.6 • Console Application (GUI feature, cut) • Maps internal commands to VLC commands • Accepts TCP Connections from mobile devices. • Makes separate TCP connection to VLC • Connects to VLC’s Remote Control Interface • Why have interpreter? Why not connect mobile devices to VLC directly?

  13. ComputerSide (Interpreter) • Decoupling • You can build a different application to act as the remote control. (e.g. iPhone application) • You can control other media players as well, as long as they have some sort of remote control interface INTERPERTER

  14. ComputerSide (Interpreter) • Usage:

  15. Problems found on Computer Side • VLC does not provide any playback information that can be used to get status of the player. • Commands sent to VLC are limited (e.g. Pause/Resume) • Difficult to detect VLC installation location. Just assumed default.

  16. Commands • Launch • Play • Pause • Stop • Next • RWD • FFW • Previous • Volume +/- • Mute (VLC bugged) • Full Screen • Quit

  17. GUI • KUIX library (http://www.kalmeo.org/projects/kuix) • Uses CSS to create dynamic UI

  18. Outside sources • http://www.kalmeo.org/projects/kuix • Md5 implementation for j2me • http://mobilepit.com/10/compact-md5-class-library-for-j2me-javame-app.html

  19. Open Source! • This project is hosted by Google’s Project Hosting • http://code.google.com/p/mobilerc/ • MIT Licensed

  20. Questions?

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