transpute (u/transpute)

transpute · 5 days ago

Cobalt + Liquid-Rust + iSH enables offline writing with iPad portability, lockdown mode security and battery life, retaining interoperability with Linux static publishing toolchains. No jailbreaks or sideloading required.

Due to lack of JIT on iOS, Jekyll is too slow to run on iSH. Liquid-Rust (https://github.com/cobalt-org/liquid-rust) templates, even with partial compatibility for the Ruby-based Liquid template engine, reduce the cost of migrating from the Jekyll Ruby static site generator used by Github Pages.

On Debian x86, build a cobalt static binary for use on iSH (Alpine Linux /w musl libc) on iPadOS:

  sudo apt install rustup build-essential
  rustup target add i586-unknown-linux-musl
  git clone https://github.com/cobalt-org/cobalt.rs
  cd cobalt.rs
  cargo build --release --target i586-unknown-linux-musl
  cp target/i586-unknown-linux-musl/release/cobalt /mnt/usb

Copy cobalt static binary to iSH filesystem via iOS Files app, execute and view http://localhost:NNNN with a web browser:

  ./cobalt --no-watch --host 0.0.0.0 --port NNNN

SARLink is a passive satellite backscatter communication system that uses existing spaceborne synthetic aperture radar (SAR) imaging satellites to provide connectivity in remote regions .. As the first technique for passively sending information bits from the ground to a SAR satellite — and with some SAR systems offering open-access data — this system could enable anyone to send information without expensive licenses or subscriptions. Thus, it provides an accessible way of sending messages in areas without connectivity or in censored environments where active radio transmissions cannot be used. Furthermore, SARLink requires no modification of the satellite infrastructure.. We demonstrate our system using the European Space Agency (ESA) satellite Sentinel-1A, as the data is freely available and the system regularly images all the land on Earth .. a 5.5 ft by 5.5 ft modulating corner reflector could send 60 bits every satellite pass, enough to support low bandwidth sensor data and messages.