Thanks Nicolas I had wondered if people were thinking along these lines. And it's already written :-)
I still wonder if anyone uses the "lowfer" radio frequencies for the same, very low bandwidth :-)
In the US some VLF frequency ranges are unregulated and available for experimental use. Another subgroup in the radio hobbyist spectrum.
It is
designed for internet-of-things devices, but the bandwidth it offers is
enough to SSH and read the end of a log file and restart a daemon. Since
I have a few technically-minded friends and acquaintances living in the
same dense urban area, I am considering trying to use it to establish a
kind of private network for emergency access.
I have found these articles, about a LoRa-based USB device and its use
to do just that kind of thing:
https://unsigned.io/product/rnode/
https://unsigned.io/15-kilometre-ssh-link-with-rnode/
(It seems to be out of stock, but the design is open.)
I wonder if some people here have already had the same idea and explored
it further, especially with software readily available in Debian?
Regards,
--
Nicolas George