@speed:
I don't want to be bad, but using Google would be really nice (you can also find info in your own native language on Google):
https://www.google.c...uner what is it
As for the Linux receiver, everyone should be able to handle IPTV.
It depends on the specific needs, everything you need to have a Linux receiver included (CI+ slot, UNI reader slot, USB 3.0 / 3.1, support for another tuner - so-called COMBO, external IR sensor, device dimensions, optical audio output, RS232 comm interface, etc.). You only have to choose for yourself, depending on what you need in the Linux receiver.
Note that some old video formats are not supported by hardware (chipset) on new Vu+ 4K devices.
Buy, for example, Formuler F4 Turbo. Same as me .
Although ... there are still many possibilities ... from which a suitable Linux receiver can be selected - Octagon, Zgemma, .... .