@wendigo I was not able to get the file correcly (and with .click). @advocatux gave it to me. I have installed it and it goes. Thanks a lot.
When it is made the software we have to convince the makers of Raspberry pi to construct and sell a real device, a phone.
@mihael +1 Or making them.
@libremax I forgot that the question was here and I asked today to Fabian in Telegram. The protocol is in fact SSL VPN and it seems it is not suported so we finish here. Thanks a lot.
@libremax Thanks. I'll say you next monday.
@cesar-herrera I'm not sure but I think it is SSL VPN
@flohack Next monday I'll ask the VPN protocol and I'll say you. Thanks to @Flohack, @cherrie and @UKPhil .