The Living Thing / Notebooks :

DIY internet infrastructure

Usefulness: 🔧
Novelty: 💡
Uncertainty: 🤪 🤪 🤪
Incompleteness: 🚧 🚧 🚧

A lot of ideas here. See the overview in Kris De Decker, How to Build a Low Tech Internet (although they do not mean low tech so much as cheap/easy tech).

Connects with sneakernets via drive by netowrking and data mules.

Smartphone mesh networks

Everyone talks about this but I am not aware of many implementation. Famously Bridgefy uses bluetooth to mesh-network devices over bluetooth, as seen in the Hong Kong 2019 protests.

Others off-the-shelf mesh systems must exist, but the only ones I am aware of are special-purpose networks built for one-off projects.

Ham radio

F4HDK, Build a Long-Distance Data Network Using Ham Radio:

Packet Radio (NPR), which I chose to publish under my call sign, F4HDK, as a nom de plume. It supports today’s de facto universal standard of communication—the Internet’s IPv4—and allows data to be transmitted at up to 500 kilobits per second on the popular 70-centimeter UHF ham radio band. […] it is still faster than the 1.2 kb/s normally used by AX.25 links, and the 70-cm band permits long-distance links even when obstructions prevent line-of-sight transmissions.

DIY antennae

DIY wireless antenna shootout.

Letgality of accessing spectrum

:shrug:

I am not an expert in the legality of these things. Research before trying.

Acoustic networks

quiet and its browser version quiet.js send data over the air via the sound card. Here is a detailed DIY for you yourself to try.

Other

🚧

Refs

Butler, Jane. 2013. Wireless networking in the developing world [a practical guide to planning and building low-cost telecommunications infrastructure. S.l.: s.n.

Hanspach, Michael, and Michael Goetz. 2013. “On Covert Acoustical Mesh Networks in Air.” Journal of Communications 8 (11): 758–67. https://doi.org/10.12720/jcm.8.11.758-767.