Plan 9: Share Media Content with TV via UPnP


 

Share media content with UPnP / DLNA capable players.

This is a proof-of-concept of network programming (TCP and UDP) in Plan 9. For information, man udp is a useful place to get started.

# Server - shares /mnt/media
upnp/server 10.0.2.15
 
# Client
upnp/fs 10.0.2.15
ls /n/upnp
echo refresh > /n/upnp/ctl
 

 

Device Quirks

VLC

VLC looks for "urn:schemas-upnp-org:service:ContentDirectory:1" instead of "urn:schemas-upnp-org:device:MediaServer:1" during M-SEARCH.

 

LG WebOS TV 

LG WebOS TV needs the services "urn:schemas-upnp-org:service:ConnectionManager:1" and "urn:microsoft.com:service:X_MS_MediaReceiverRegistrar:1" in addition to "urn:schemas-upnp-org:service:ContentDirectory:1" in device.xml. 

It also seems to remember the UUIDs for a particular IP address. If you change the UUID of our application and it doesn't appear in the TV, restarting the TV might help. 


Lessons Learnt

  1. Put program assets like XML files in /sys/lib/<app> directory.

 

Code


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