Tango Vio app doesn't work on tablet #19

Hi everyone,

First a big thank you for putting out your repository for free and also for documenting everything.

I ran into a little bit of an issue with my Tango Tablet (running on 4.4.2): I can't find the launch file for it (tango_vio_ys.launch) as described in the wiki. I tried with the regular one, however, I am getting 0s for all elements in the position and orientation messages, so the vio app doesn't work. Could somebody provide some help for getting this set up? The depth map app works properly, by the way.

Thanks a lot!
Marc