I dropped the code because it was deprecated for almost a year (and should not be used by clients). Tvheadend has currently 3 working modes for oscam, only the first implementation (UDP) was dropped. We should have one working and stable implementation (I am working toward it, eg creating a dvbapi protocol 1, which could be expanded in the future to prevents creating such problems with modes).
It is normal that deprecated things are dropped over time. UDP was a bad designed solution and therefore it is dropped (we have to start clean it up step by step, otherwise OSCam will only grow and there will be one big mess).
If you are using stable Tvheadend, please just use older and stable OSCam for it.
If you are using new Tvheadend - there is no problem to make it work!
The same is with vdr-plugin-dvbapi - old and unsupported version 1.0.6 will work with older OSCam, while new dvbapi plugin doesn't currently have problems with recent OSCams.
The UDP will not get back in, because it was dropped due to cleaning the dvbapi interface and that is all about it.
Regards SAMYGO:
As far as I know bugficks is working on a new interface currently, so hopefully you'll see something new soon (ask him for details, I know he have it working currently).