Hi joshn,
Your suggestion was very useful, thanks!
First, I pinged deb.debian.org from the device and it works. Then, I entered the default app container by means of the command that you suggested. Ping is not installed, but apt is, so I launched apt update: deb.debian.org can't be reached or something bad happens, as I only get Ign replies. This is exactly the same behavior that I get when I try to run an app with oakctl from my host PC.
I don't know whether that can be related to some settings of my Internet firewall, but it would surprise me, as I can normally use apt on my PC and I'm in the same network. Perhaps, I should try to use a different connection, but it's easier said than done.
Thank you for your support and if you have any updates, please let me know.
@jakaskerl, any thoughts based on these new tests?
Thank you!
Alessandro